1
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Bulas DI, Fraser JL, Cilli K. Using MRI derived observed to expected total lung volume to predict lethality in fetal skeletal dysplasia. Pediatr Radiol 2024; 54:854-856. [PMID: 38438708 DOI: 10.1007/s00247-024-05893-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Revised: 02/16/2024] [Accepted: 02/19/2024] [Indexed: 03/06/2024]
Affiliation(s)
- Dorothy I Bulas
- Department of Diagnostic Imaging and Radiology, Zickler Family Prenatal Pediatrics Institute, Children's National Hospital, 111 Michigan Ave, Washington, DC, 20010, USA.
| | - Jamie L Fraser
- Division of Genetics and Metabolism, Department of Pediatrics, Rare Disease Institute, Zickler Family Prenatal Pediatrics Institute, Children's National Hospital, 7125 Michigan Ave, Washington, DC, 20012, USA
| | - Kate Cilli
- Department of Diagnostic Imaging and Radiology, Zickler Family Prenatal Pediatrics Institute, Children's National Hospital, 111 Michigan Ave, Washington, DC, 20010, USA
- Zickler Family Prenatal Pediatrics Institute, Children's National Hospital, 111 Michigan Ave, Washington, DC, 20010, USA
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Sanchez Giralt JA, Tusman G, Wallin M, Hallback M, Perez Lucendo A, Sanchez Galindo M, Abad Santamaria B, Paz Calzada E, Garcia Garcia P, Rodriguez Huerta D, Canabal Berlanga A, Suarez-Sipmann F. Clinical validation of a capnodynamic method for measuring end-expiratory lung volume in critically ill patients. Crit Care 2024; 28:142. [PMID: 38689313 PMCID: PMC11059761 DOI: 10.1186/s13054-024-04928-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Accepted: 04/21/2024] [Indexed: 05/02/2024] Open
Abstract
RATIONALE End-expiratory lung volume (EELV) is reduced in mechanically ventilated patients, especially in pathologic conditions. The resulting heterogeneous distribution of ventilation increases the risk for ventilation induced lung injury. Clinical measurement of EELV however, remains difficult. OBJECTIVE Validation of a novel continuous capnodynamic method based on expired carbon dioxide (CO2) kinetics for measuring EELV in mechanically ventilated critically-ill patients. METHODS Prospective study of mechanically ventilated patients scheduled for a diagnostic computed tomography exploration. Comparisons were made between absolute and corrected EELVCO2 values, the latter accounting for the amount of CO2 dissolved in lung tissue, with the reference EELV measured by computed tomography (EELVCT). Uncorrected and corrected EELVCO2 was compared with total CT volume (density compartments between - 1000 and 0 Hounsfield units (HU) and functional CT volume, including density compartments of - 1000 to - 200HU eliminating regions of increased shunt. We used comparative statistics including correlations and measurement of accuracy and precision by the Bland Altman method. MEASUREMENTS AND MAIN RESULTS Of the 46 patients included in the final analysis, 25 had a diagnosis of ARDS (24 of which COVID-19). Both EELVCT and EELVCO2 were significantly reduced (39 and 40% respectively) when compared with theoretical values of functional residual capacity (p < 0.0001). Uncorrected EELVCO2 tended to overestimate EELVCT with a correlation r2 0.58; Bias - 285 and limits of agreement (LoA) (+ 513 to - 1083; 95% CI) ml. Agreement improved for the corrected EELVCO2 to a Bias of - 23 and LoA of (+ 763 to - 716; 95% CI) ml. The best agreement of the method was obtained by comparison of corrected EELVCO2 with functional EELVCT with a r2 of 0.59; Bias - 2.75 (+ 755 to - 761; 95% CI) ml. We did not observe major differences in the performance of the method between ARDS (most of them COVID related) and non-ARDS patients. CONCLUSION In this first validation in critically ill patients, the capnodynamic method provided good estimates of both total and functional EELV. Bias improved after correcting EELVCO2 for extra-alveolar CO2 content when compared with CT estimated volume. If confirmed in further validations EELVCO2 may become an attractive monitoring option for continuously monitor EELV in critically ill mechanically ventilated patients. TRIAL REGISTRATION clinicaltrials.gov (NCT04045262).
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Affiliation(s)
- J A Sanchez Giralt
- Department of Intensive Care, Hospital Universitario de La Princesa, Diego de León 62, 28006, Madrid, Spain
| | - G Tusman
- Department of Anesthesia, Hospital Privado de Comunidad, Mar del Plata, Argentina
| | - M Wallin
- Department of Physiology and Pharmacology (FYFA), C3, Eriksson Lars Group, Karolinska Institute, Stockholm, Sweden
| | | | - A Perez Lucendo
- Department of Intensive Care, Hospital Universitario de La Princesa, Diego de León 62, 28006, Madrid, Spain
| | - M Sanchez Galindo
- Department of Intensive Care, Hospital Universitario de La Princesa, Diego de León 62, 28006, Madrid, Spain
| | - B Abad Santamaria
- Department of Intensive Care, Hospital Universitario de La Princesa, Diego de León 62, 28006, Madrid, Spain
| | - E Paz Calzada
- Deparment of Radiology, Hospital Universitario de la Princesa, Madrid, España
| | - P Garcia Garcia
- Deparment of Radiology, Hospital Universitario de la Princesa, Madrid, España
| | - D Rodriguez Huerta
- Department of Intensive Care, Hospital Universitario de La Princesa, Diego de León 62, 28006, Madrid, Spain
| | - A Canabal Berlanga
- Department of Intensive Care, Hospital Universitario de La Princesa, Diego de León 62, 28006, Madrid, Spain
| | - Fernando Suarez-Sipmann
- Department of Intensive Care, Hospital Universitario de La Princesa, Diego de León 62, 28006, Madrid, Spain.
- CIBER Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain.
- Hedenstierna Laboratory, Uppsala University, Uppsala, Sweden.
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Otake S, Shiraishi Y, Chubachi S, Tanabe N, Maetani T, Asakura T, Namkoong H, Shimada T, Azekawa S, Nakagawara K, Tanaka H, Fukushima T, Watase M, Terai H, Sasaki M, Ueda S, Kato Y, Harada N, Suzuki S, Yoshida S, Tateno H, Yamada Y, Jinzaki M, Hirai T, Okada Y, Koike R, Ishii M, Hasegawa N, Kimura A, Imoto S, Miyano S, Ogawa S, Kanai T, Fukunaga K. Lung volume measurement using chest CT in COVID-19 patients: a cohort study in Japan. BMJ Open Respir Res 2024; 11:e002234. [PMID: 38663888 PMCID: PMC11043761 DOI: 10.1136/bmjresp-2023-002234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Accepted: 04/09/2024] [Indexed: 04/28/2024] Open
Abstract
OBJECTIVE This study aimed to investigate the utility of CT quantification of lung volume for predicting critical outcomes in COVID-19 patients. METHODS This retrospective cohort study included 1200 hospitalised patients with COVID-19 from 4 hospitals. Lung fields were extracted using artificial intelligence-based segmentation, and the percentage of the predicted (%pred) total lung volume (TLC (%pred)) was calculated. The incidence of critical outcomes and posthospitalisation complications was compared between patients with low and high CT lung volumes classified based on the median percentage of predicted TLCct (n=600 for each). Prognostic factors for residual lung volume loss were investigated in 208 patients with COVID-19 via a follow-up CT after 3 months. RESULTS The incidence of critical outcomes was higher in the low TLCct (%pred) group than in the high TLCct (%pred) group (14.2% vs 3.3%, p<0.0001). Multivariable analysis of previously reported factors (age, sex, body mass index and comorbidities) demonstrated that CT-derived lung volume was significantly associated with critical outcomes. The low TLCct (%pred) group exhibited a higher incidence of bacterial infection, heart failure, thromboembolism, liver dysfunction and renal dysfunction than the high TLCct (%pred) group. TLCct (%pred) at 3 months was similarly divided into two groups at the median (71.8%). Among patients with follow-up CT scans, lung volumes showed a recovery trend from the time of admission to 3 months but remained lower in critical cases at 3 months. CONCLUSION Lower CT lung volume was associated with critical outcomes, posthospitalisation complications and slower improvement of clinical conditions in COVID-19 patients.
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Affiliation(s)
- Shiro Otake
- ivision of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Yusuke Shiraishi
- Department of Respiratory Medicine, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Shotaro Chubachi
- ivision of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Naoya Tanabe
- Department of Respiratory Medicine, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Tomoki Maetani
- Department of Respiratory Medicine, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Takanori Asakura
- Division of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Ho Namkoong
- Division of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Takashi Shimada
- ivision of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Shuhei Azekawa
- ivision of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Kensuke Nakagawara
- ivision of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Hiromu Tanaka
- ivision of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Takahiro Fukushima
- ivision of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Mayuko Watase
- Department of Respiratory Medicine, National Hospital Organization Tokyo Medical Centre, Tokyo, Japan
| | - Hideki Terai
- ivision of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Mamoru Sasaki
- Department of Internal Medicine, Saitama Medical Center, Tokyo, Japan
| | - Soichiro Ueda
- Department of Internal Medicine, Saitama Medical Center, Tokyo, Japan
| | - Yukari Kato
- Division of Respiratory Medicine, Juntendo University School of Medicine Graduate School of Medicine, Bunkyo-ku, Japan
| | - Norihiro Harada
- Division of Respiratory Medicine, Juntendo University School of Medicine Graduate School of Medicine, Bunkyo-ku, Japan
| | - Shoji Suzuki
- Department of Pulmonary Medicine, Saitama City Hospital, Saitama, Japan
| | - Shuichi Yoshida
- Department of Pulmonary Medicine, Saitama City Hospital, Saitama, Japan
| | - Hiroki Tateno
- Department of Pulmonary Medicine, Saitama City Hospital, Saitama, Japan
| | - Yoshitake Yamada
- Keio University Department of Radiology, Shinjuku-ku, Tokyo, Japan
| | - Masahiro Jinzaki
- Keio University Department of Radiology, Shinjuku-ku, Tokyo, Japan
| | - Toyohiro Hirai
- Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Yukinori Okada
- Department of Statistical Genetics, Osaka University Graduate School of Medicine, Suita, Japan
- Department of Genome Informatics, The University of Tokyo Graduate School of Medicine Faculty of Medicine, Bunkyo-ku, Japan
| | - Ryuji Koike
- Department of Pharmacovigilance, Tokyo Medical and Dental University, Tokyo, Japan
| | - Makoto Ishii
- Faculty of Medicine, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Naoki Hasegawa
- Center for Infectious Diseases and Infection Control, Keio University, School of Medicine, Tokyo, Japan
| | - Akinori Kimura
- Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
| | | | - Satoru Miyano
- Tokyo Medical and Dental University, Bunkyo-ku, Japan
| | - Seishi Ogawa
- Department of Pathology and Tumor Biology, Kyoto University Graduate School of Medicine Faculty of Medicine, Kyoto, Japan
- Department of Medicine, Regenerative Medicine Karolinska Institute, Stockholm, Sweden
| | - Takanori Kanai
- Division of Gastroenterology and Hepatology Department of Internal Medicine, Keio University School of Medicine, Shinjuku-ku, Japan
| | - Koichi Fukunaga
- ivision of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo, Japan
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Mraz T, Asgari S, Karimi A, Breyer MK, Hartl S, Sunanta O, Ofenheimer A, Burghuber OC, Zacharasiewicz A, Lamprecht B, Schiffers C, Wouters EFM, Breyer-Kohansal R. Updated reference values for static lung volumes from a healthy population in Austria. Respir Res 2024; 25:155. [PMID: 38570835 PMCID: PMC10988832 DOI: 10.1186/s12931-024-02782-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 03/21/2024] [Indexed: 04/05/2024] Open
Abstract
BACKGROUND Reference values for lung volumes are necessary to identify and diagnose restrictive lung diseases and hyperinflation, but the values have to be validated in the relevant population. Our aim was to investigate the Global Lung Function Initiative (GLI) reference equations in a representative healthy Austrian population and create population-derived reference equations if poor fit was observed. METHODS We analysed spirometry and body plethysmography data from 5371 respiratory healthy subjects (6-80 years) from the Austrian LEAD Study. Fit with the GLI equations was examined using z-scores and distributions within the limits of normality. LEAD reference equations were then created using the LMS method and the generalized additive model of location shape and scale package according to GLI models. RESULTS Good fit, defined as mean z-scores between + 0.5 and -0.5,was not observed for the GLI static lung volume equations, with mean z-scores > 0.5 for residual volume (RV), RV/TLC (total lung capacity) and TLC in both sexes, and for expiratory reserve volume (ERV) and inspiratory capacity in females. Distribution within the limits of normality were shifted to the upper limit except for ERV. Population-derived reference equations from the LEAD cohort showed superior fit for lung volumes and provided reproducible results. CONCLUSION GLI lung volume reference equations demonstrated a poor fit for our cohort, especially in females. Therefore a new set of Austrian reference equations for static lung volumes was developed, that can be applied to both children and adults (6-80 years of age).
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Affiliation(s)
- Tobias Mraz
- Department of Respiratory and Pulmonary Diseases, Vienna Healthcare Group, Clinic Penzing, Sanatoriumstrasse 2, Vienna, 1140, Austria.
- Ludwig Boltzmann Institute for Lung Health, Vienna, Austria.
| | - Shervin Asgari
- Ludwig Boltzmann Institute for Lung Health, Vienna, Austria
- Faculty of Medicine, Sigmund Freud Private University, Vienna, Austria
| | - Ahmad Karimi
- Ludwig Boltzmann Institute for Lung Health, Vienna, Austria
- Faculty of Medicine, Sigmund Freud Private University, Vienna, Austria
| | - Marie-Kathrin Breyer
- Department of Respiratory and Pulmonary Diseases, Vienna Healthcare Group, Clinic Penzing, Sanatoriumstrasse 2, Vienna, 1140, Austria
- Ludwig Boltzmann Institute for Lung Health, Vienna, Austria
| | - Sylvia Hartl
- Ludwig Boltzmann Institute for Lung Health, Vienna, Austria
- Faculty of Medicine, Sigmund Freud Private University, Vienna, Austria
| | - Owat Sunanta
- Ludwig Boltzmann Institute for Lung Health, Vienna, Austria
| | - Alina Ofenheimer
- Ludwig Boltzmann Institute for Lung Health, Vienna, Austria
- Faculty of Medicine, Sigmund Freud Private University, Vienna, Austria
- School of Nutrition and Translational Research in Metabolism, NUTRIM, Maastricht University Medical Center, Maastricht, the Netherlands
| | - Otto C Burghuber
- Department of Respiratory and Pulmonary Diseases, Vienna Healthcare Group, Clinic Penzing, Sanatoriumstrasse 2, Vienna, 1140, Austria
- Ludwig Boltzmann Institute for Lung Health, Vienna, Austria
- Faculty of Medicine, Sigmund Freud Private University, Vienna, Austria
| | | | - Bernd Lamprecht
- Department of Pulmonology, Kepler University Hospital, Linz, Austria
- Medical Faculty, Johannes Kepler University, Linz, Austria
| | | | - Emiel F M Wouters
- Ludwig Boltzmann Institute for Lung Health, Vienna, Austria
- Faculty of Medicine, Sigmund Freud Private University, Vienna, Austria
- School of Nutrition and Translational Research in Metabolism, NUTRIM, Maastricht University Medical Center, Maastricht, the Netherlands
| | - Robab Breyer-Kohansal
- Ludwig Boltzmann Institute for Lung Health, Vienna, Austria
- Department of Respiratory and Pulmonary Diseases, Vienna Healthcare Group, Clinic Hietzing, Vienna, Austria
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5
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Gatti S, Rezoagli E, Madotto F, Foti G, Bellani G. A non-invasive continuous and real-time volumetric monitoring in spontaneous breathing subjects based on bioimpedance-ExSpiron®Xi: a validation study in healthy volunteers. J Clin Monit Comput 2024; 38:539-551. [PMID: 38238635 PMCID: PMC10994998 DOI: 10.1007/s10877-023-01107-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Accepted: 11/10/2023] [Indexed: 04/06/2024]
Abstract
Tidal volume (TV) monitoring breath-by-breath is not available at bedside in non-intubated patients. However, TV monitoring may be useful to evaluate the work of breathing. A non-invasive device based on bioimpedance provides continuous and real-time volumetric tidal estimation during spontaneous breathing. We performed a prospective study in healthy volunteers aimed at evaluating the accuracy, the precision and the trending ability of measurements of ExSpiron®Xi as compared with the gold standard (i.e. spirometry). Further, we explored whether the differences between the 2 devices would be improved by the calibration of ExSpiron®Xi with a pre-determined tidal volume. Analysis accounted for the repeated nature of measurements within each subject. We enrolled 13 healthy volunteers, including 5 men and 8 women. Tidal volume, TV/ideal body weight (IBW) and respiratory rate (RR) measured with spirometer (TVSpirometer) and with ExSpiron®Xi (TVExSpiron) showed a robust correlation, while minute ventilation (MV) showed a weak correlation, in both non/calibrated and calibrated steps. The analysis of the agreement showed that non-calibrated TVExSpiron underestimated TVspirometer, while in the calibrated steps, TVExSpiron overestimated TVspirometer. The calibration procedure did not reduce the average absolute difference (error) between TVSpirometer and TVExSpiron. This happened similarly for TV/IBW and MV, while RR showed high accuracy and precision. The trending ability was excellent for TV, TV/IBW and RR. The concordance rate (CR) was >95% in both calibrated and non-calibrated measurements. The trending ability of minute ventilation was limited. Absolute error for both calibrated and not calibrated values of TV, TV/IBW and MV accounting for repeated measurements was variably associated with BMI, height and smoking status. Conclusions: Non-invasive TV, TV/IBW and RR estimation by ExSpiron®Xi was strongly correlated with tidal ventilation according to the gold standard spirometer technique. This data was not confirmed for MV. The calibration of the device did not improve its performance. Although the accuracy of ExSpiron®Xi was mild and the precision was limited for TV, TV/IBW and MV, the trending ability of the device was strong specifically for TV, TV/IBW and RR. This makes ExSpiron®Xi a non-invasive monitoring system that may detect real-time tidal volume ventilation changes and then suggest the need to better optimize the patient ventilatory support.
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Affiliation(s)
- Stefano Gatti
- Department of Emergency and Intensive Care, Terapia Intensiva e Semintensiva adulti e Pediatrica, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy
| | - Emanuele Rezoagli
- Department of Emergency and Intensive Care, Terapia Intensiva e Semintensiva adulti e Pediatrica, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy
- School of Medicine and Surgery, University of Milano-Bicocca, Monza, Italy
| | - Fabiana Madotto
- Department of Area Emergenza Urgenza, Fondazione IRCCS Ca' Granda - Ospedale Maggiore Policlinico, Milan, Italy
| | - Giuseppe Foti
- Department of Emergency and Intensive Care, Terapia Intensiva e Semintensiva adulti e Pediatrica, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy
- School of Medicine and Surgery, University of Milano-Bicocca, Monza, Italy
| | - Giacomo Bellani
- Centre for Medical Sciences - CISMed, University of Trento, Trento, Italy.
- Anesthesia and Intensive Care, Santa Chiara Regional Hospital, APSS Trento Largo Medaglie d'Oro, Trento, Italy.
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Ding W, Gu Y, Wang H, Wu H, Zhang X, Zhang R, Wang H, Huang L, Lv J, Xia B, Zhong W, He Q, Hou L. Prenatal MRI assessment of mediastinal shift angle as a feasible and effective risk stratification tool in isolated right-sided congenital diaphragmatic hernia. Eur Radiol 2024; 34:1524-1533. [PMID: 37644150 DOI: 10.1007/s00330-023-10178-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 06/21/2023] [Accepted: 07/07/2023] [Indexed: 08/31/2023]
Abstract
OBJECTIVES To develop a mediastinal shift angle (MSA) measurement method applicable to right-sided congenital diaphragmatic hernia (RCDH) in fetal MRI and to validate the predictive value of MSA in RCDH. METHODS Twenty-seven fetuses with isolated RCDH and 53 controls were included in our study. MSA was measured on MRI axial image at the level of four-chamber view of the fetal heart. The angle between the sagittal midline landmark line and the left boundary landmark line touching tangentially the lateral wall of the left ventricle was used to quantify MSA for RCDH. Appropriate statistical analyses were performed to determine whether MSA can be regarded as a valid predictive tool for postnatal outcomes. Furthermore, predictive performance of MSA was compared with that of lung area to head circumference ratio (LHR), observed/expected LHR (O/E LHR), total fetal lung volume (TFLV), and observed/expected TFLV (O/E TFLV). RESULTS MSA was significantly higher in the RCDH group than in the control group. MSA, LHR, O/E LHR, TFLV, and O/E TFLV were all correlated with postnatal survival, pulmonary hypertension (PH), and extracorporeal membrane oxygenation (ECMO) therapy (p < 0.05). Value of the AUC demonstrated good predictive performance of MSA for postnatal survival (0.901, 95%CI: (0.781-1.000)), PH (0.828, 95%CI: (0.661-0.994)), and ECMO therapy (0.813, 95%CI: (0.645-0.980)), which was similar to O/E TFLV but slightly better than TFLV, O/E LHR, and LHR. CONCLUSIONS We developed a measurement method of MSA for RCDH for the first time and demonstrated that MSA could be used to predict postnatal survival, PH, and ECMO therapy in RCDH. CLINICAL RELEVANCE STATEMENT Newly developed MRI assessment method of fetal MSA in RCDH offers a simple and effective risk stratification tool for patients with RCDH. KEY POINTS • We developed a measurement method of mediastinal shift angle for right-sided congenital diaphragmatic hernia for the first time and demonstrated its feasibility and reproducibility. • Mediastinal shift angle can predict more prognostic information other than survival in right-sided congenital diaphragmatic hernia with good performance. • Mediastinal shift angle can be used as a simple and effective risk stratification tool in right-sided congenital diaphragmatic hernia to improve planning of postnatal management.
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Affiliation(s)
- Wen Ding
- Department of Fetal Medicine, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Yuanyuan Gu
- Department of Fetal Medicine, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China.
- Department of Obstetrics and Gynecology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China.
| | - Haiyu Wang
- Department of Medical Imaging, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Huiying Wu
- Department of Medical Imaging, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Xiaochun Zhang
- Department of Medical Imaging, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Rui Zhang
- Department of Medical Imaging, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Hongying Wang
- Department of Medical Imaging, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Li Huang
- Department of Medical Imaging, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Junjian Lv
- Surgical Neonatal Intensive Care Unit, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Bo Xia
- Surgical Neonatal Intensive Care Unit, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Wei Zhong
- Department of Pediatric Surgery, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Qiuming He
- Department of Pediatric Surgery, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Longlong Hou
- Department of Pediatric Surgery, Guangzhou Women and Children's Medical Center, Guangzhou, China
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7
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Veneroni C, Dellacà RL, Küng E, Bonomi B, Berger A, Werther T. Oscillometry for personalizing continuous distending pressure maneuvers: an observational study in extremely preterm infants. Respir Res 2024; 25:4. [PMID: 38178216 PMCID: PMC10765834 DOI: 10.1186/s12931-023-02639-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Accepted: 12/15/2023] [Indexed: 01/06/2024] Open
Abstract
RATIONALE Lung recruitment and continuous distending pressure (CDP) titration are critical for assuring the efficacy of high-frequency ventilation (HFOV) in preterm infants. The limitation of oxygenation (peripheral oxygen saturation, SpO2) in optimizing CDP calls for evaluating other non-invasive bedside measurements. Respiratory reactance (Xrs) at 10 Hz measured by oscillometry reflects lung volume recruitment and tissue strain. In particular, lung volume recruitment and decreased tissue strain result in increased Xrs values. OBJECTIVES In extremely preterm infants treated with HFOV as first intention, we aimed to measure the relationship between CDP and Xrs during SpO2-driven CDP optimization. METHODS In this prospective observational study, extremely preterm infants born before 28 weeks of gestation undergoing SpO2-guided lung recruitment maneuvers were included in the study. SpO2 and Xrs were recorded at each CDP step. The optimal CDP identified by oxygenation (CDPOpt_SpO2) was compared to the CDP providing maximal Xrs on the deflation limb of the recruitment maneuver (CDPXrs). RESULTS We studied 40 infants (gestational age at birth = 22+ 6-27+ 5 wk; postnatal age = 1-23 days). Measurements were well tolerated and provided reliable results in 96% of cases. On average, Xrs decreased during the inflation limb and increased during the deflation limb. Xrs changes were heterogeneous among the infants for the amount of decrease with increasing CDP, the decrease at the lowest CDP of the deflation limb, and the hysteresis of the Xrs vs. CDP curve. In all but five infants, the hysteresis of the Xrs vs. CDP curve suggested effective lung recruitment. CDPOpt_SpO2 and CDPXrs were highly correlated (ρ = 0.71, p < 0.001) and not statistically different (median difference [range] = -1 [-3; 9] cmH2O). However, CDPXrs were equal to CDPOpt_SpO2 in only 6 infants, greater than CDPOpt_SpO2 in 10, and lower in 24 infants. CONCLUSIONS The Xrs changes described provide complementary information to oxygenation. Further investigation is warranted to refine recruitment maneuvers and CPD settings in preterm infants.
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Affiliation(s)
- Chiara Veneroni
- TechRes Lab, Department of Electronics, Information and Biomedical Engineering (DEIB), Politecnico di Milano University, Via G. Colombo 40, Milan, 20133, Italy
| | - Raffaele L Dellacà
- TechRes Lab, Department of Electronics, Information and Biomedical Engineering (DEIB), Politecnico di Milano University, Via G. Colombo 40, Milan, 20133, Italy.
| | - Erik Küng
- Division of Neonatology, Pediatric Intensive Care and Neuropediatrics, Department of Pediatrics, Comprehensive Center for Pediatrics, Medical University of Vienna, Vienna, Austria
| | - Beatrice Bonomi
- TechRes Lab, Department of Electronics, Information and Biomedical Engineering (DEIB), Politecnico di Milano University, Via G. Colombo 40, Milan, 20133, Italy
| | - Angelika Berger
- Division of Neonatology, Pediatric Intensive Care and Neuropediatrics, Department of Pediatrics, Comprehensive Center for Pediatrics, Medical University of Vienna, Vienna, Austria
| | - Tobias Werther
- Division of Neonatology, Pediatric Intensive Care and Neuropediatrics, Department of Pediatrics, Comprehensive Center for Pediatrics, Medical University of Vienna, Vienna, Austria
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Fernández Ceballos I, Ems J, Steinberg E, Nuñez Silveira JM, Hornos MB, Berdiñas Anfuso M, Videla C, Ciarrocchi NM, Carboni Bisso I, Las Heras M. Pulmonary strain and end-expiratory lung volume during apnea test: a comparative analysis using electrical impedance tomography. Medicina (B Aires) 2024; 84:359-363. [PMID: 38683525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2024] Open
Abstract
The apnea test, employed for brain death assessment, aims to demonstrate the absence of respiratory drive due to hypercapnia. The tracheal oxygen insufflation apnea test mode (I-AT) involves disconnecting the patient from invasive mechanical ventilation (iMV) for approximately 8 minutes while maintaining oxygenation. This test supports the diagnosis of brain death based on a specified increase in PaCO2. Common complications include hypoxemia and hemodynamic instability, and lung collapse-induced reduction in end-expiratory lung volume (EELV). In our case series utilizing electrical impedance tomography (EIT), we observed that continuous positive airway pressure during the apnea test (CPAP-AT) effectively mitigated lung collapse. This resulted in improved pulmonary strain compared to the disconnection of iMV. These findings suggest the potential benefits of routine CPAP-AT, particularly for potential lung donors, emphasizing the relevance of our study in providing quantitative insights into EELV loss and its association with pulmonary strain and potential lung injury.
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Affiliation(s)
| | - Joaquín Ems
- Unidad de Cuidados Intensivos, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina
| | - Emilio Steinberg
- Unidad de Cuidados Intensivos, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina
| | - Juan M Nuñez Silveira
- Unidad de Cuidados Intensivos, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina
| | - Micaela B Hornos
- Unidad de Cuidados Intensivos, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina
| | - Melany Berdiñas Anfuso
- Unidad de Cuidados Intensivos, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina
| | - Carlos Videla
- Unidad de Cuidados Intensivos, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina
| | - Nicolás M Ciarrocchi
- Unidad de Cuidados Intensivos, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina
| | | | - Marcos Las Heras
- Unidad de Cuidados Intensivos, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina
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9
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Roach DJ, Szugye NA, Moore RA, Hossain MM, Morales DLS, Hayes D, Towe CT, Zafar F, Woods JC. Improved donor lung size matching by estimation of lung volumes based on chest X-ray measurements. Pediatr Transplant 2023; 27:e14594. [PMID: 37655840 DOI: 10.1111/petr.14594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 08/04/2023] [Accepted: 08/09/2023] [Indexed: 09/02/2023]
Abstract
RATIONALE Organ size matching is an important determinant of successful allocation and outcomes in lung transplantation. While computed tomography (CT) is the gold standard, it is rarely used in an organ-donor context, and chest X-ray (CXR) may offer a practical and accurate solution in estimating lung volumes for donor and recipient size matching. We compared CXR lung measurements to CT-measured lung volumes and traditional estimates of lung volume in the same subjects. METHODS Our retrospective study analyzed clinically obtained CXR and CT lung images of 250 subjects without evidence of lung disease (mean age 9.9 ± 7.8 years; 129 M/121F). From CT, each lung was semi-automatically segmented and total lung volumes were quantified. From anterior-posterior CXR view, each lung was manually segmented and areas were measured. Lung lengths from the apices to the mid-basal regions of each lung were measured from CXR. Quantified CT lung volumes were compared to the corresponding CXR lung lengths, CXR lung areas, height, weight, and predicted total lung capacity (pTLC). RESULTS There are strong and significant correlations between CT volumes and CXR lung areas in the right lung (R2 = .89, p < .0001), left lung (R2 = .87, p < .0001), and combined lungs (R2 = .89, p < .0001). Similar correlations were seen between CT volumes and CXR measured lung lengths in the right lung (R2 = .79, p < .0001) and left lung (R2 = .81, p < .0001). This correlation between anatomical lung volume (CT) and CXR was stronger than lung-volume correlation to height (R2 = .66, p < .0001), weight (R2 = .43, p < .0001), or pTLC (R2 = .66, p < .0001). CONCLUSION CXR measures correlate much more strongly with true lung volumes than height, weight, or pTLC. The ability to obtain efficient and more accurate lung volume via CXR has the potential to change our current listing practices of using height as a surrogate for lung size, with a case example provided.
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Affiliation(s)
- David J Roach
- Center for Pulmonary Imaging Research, Division of Pulmonary Medicine and Department of Radiology, Cincinnati Children's Hospital Medical Center, Ohio, Cincinnati, USA
| | - Nick A Szugye
- The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
| | - Ryan A Moore
- The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
| | - Md Monir Hossain
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Ohio, Cincinnati, USA
- Department of Biostatistics and Epidemiology, Cincinnati Children's Hospital Medical Center, Ohio, Cincinnati, USA
| | - David L S Morales
- The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
| | - Don Hayes
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Ohio, Cincinnati, USA
- Division of Pulmonary Medicine, Cincinnati Children's Hospital Medical Center, Ohio, Cincinnati, USA
| | - Christopher T Towe
- Division of Pulmonary Medicine, Cincinnati Children's Hospital Medical Center, Ohio, Cincinnati, USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Ohio, Cincinnati, USA
| | - Farhan Zafar
- The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
| | - Jason C Woods
- Center for Pulmonary Imaging Research, Division of Pulmonary Medicine and Department of Radiology, Cincinnati Children's Hospital Medical Center, Ohio, Cincinnati, USA
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Ohio, Cincinnati, USA
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10
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Wilson L, Whitby EH. MRI prediction of fetal lung volumes and the impact on counselling. Clin Radiol 2023; 78:955-959. [PMID: 37813756 DOI: 10.1016/j.crad.2023.09.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 08/25/2023] [Accepted: 09/04/2023] [Indexed: 10/11/2023]
Abstract
AIM To assess whether lung volume percentages in congenital diaphragmatic hernia (CDH) differ depending on which formula is used to calculate the expected volume for gestation and any potential impact this may have on perinatal counselling. MATERIALS AND METHODS Forty-seven patients with left-sided CDH who had undergone fetal magnetic resonance imaging (MRI) at Sheffield Teaching Hospitals were reviewed. The lung volumes were measured on MRI and compared with the volumes that would be expected at the given gestation for each patient. Expected values were calculated using four formulae from the literature and the authors' in-house method. These measurements were used to calculate the percentage total lung volume observed compared with the expected lung volume in a healthy fetus of the same gestation. The differences in percentage lung volumes using these five methods were then compared with how they relate to predicted rates of survival. How predicted survival would change depending on which formula was used to calculate the percentage lung volume was investigated with a view to how this may change the counselling given to a family. RESULTS In 10/47 (21%) patients, there was no change in the predicted percentage chance of survival depending on which formula was used to calculate the predicted lung volume. In 37/47 (79%), the predicted chance of survival changed depending on which formula was used to calculate the expected lung volume at the given gestation. In 20 (47%) of these cases, the change in predicted survival depending on which formula used was 45% (i.e., from 25% to 70% survival in four and from 50% to 95% survival in 16) and in two cases (4%) this difference was 70% (i.e., from 25% predicted survival to 95% predicted survival). CONCLUSION There are several different methods for calculating expected lung volumes for any given gestation. When used to estimate the percentage lung volume in patients with CDH, there is a large difference in values depending on which method is used. This in turn leads to a large variation in predicted survival with some patients in this study having either a 25% or 95% chance of survival depending on which method is used. This has a huge impact on perinatal counselling and the difficult decisions made by families.
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Affiliation(s)
- L Wilson
- School of Medicine and Population Health, University of Sheffield, Sheffield, UK.
| | - E H Whitby
- School of Medicine and Population Health, University of Sheffield, Sheffield, UK; Medical Imaging and Medical Physics, Sheffield Teaching Hospitals, Sheffield, UK
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11
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FitzMaurice TS, McCann C, Nazareth D, Hawkes S, Shaw M, McNamara PS, Walshaw M. Feasibility of dynamic chest radiography to calculate lung volumes in adult people with cystic fibrosis: a pilot study. BMJ Open Respir Res 2023; 10:e001309. [PMID: 37147023 PMCID: PMC10163553 DOI: 10.1136/bmjresp-2022-001309] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 04/21/2023] [Indexed: 05/07/2023] Open
Abstract
INTRODUCTION Dynamic chest radiography (DCR) is a novel, low-dose, real-time digital imaging system where software identifies moving thoracic structures and can automatically calculate lung areas. In an observational, prospective, non-controlled, single-centre pilot study, we compared it with whole-body plethysmography (WBP) in the measurement of lung volume subdivisions in people with cystic fibrosis (pwCF). METHODS Lung volume subdivisions were estimated by DCR using projected lung area (PLA) during deep inspiration, tidal breathing and full expiration, and compared with same-day WBP in 20 adult pwCF attending routine review. Linear regression models to predict lung volumes from PLA were developed. RESULTS Total lung area (PLA at maximum inspiration) correlated with total lung capacity (TLC) (r=0.78, p<0.001), functional residual lung area with functional residual capacity (FRC) (r=0.91, p<0.001), residual lung area with residual volume (RV) (r=0.82, p=0.001) and inspiratory lung area with inspiratory capacity (r=0.72, p=0.001). Despite the small sample size, accurate models were developed for predicting TLC, RV and FRC. CONCLUSION DCR is a promising new technology that can be used to estimate lung volume subdivisions. Plausible correlations between plethysmographic lung volumes and DCR lung areas were identified. Further studies are needed to build on this exploratory work in both pwCF and individuals without CF. TRIAL REGISTRATION NUMBER ISRCTN64994816.
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Affiliation(s)
- Thomas Simon FitzMaurice
- Department of Respiratory Medicine, Liverpool Heart and Chest Hospital NHS Foundation Trust, Liverpool, UK
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, UK
| | - Caroline McCann
- Department of Radiology, Liverpool Heart and Chest Hospital NHS Foundation Trust, Liverpool, UK
| | - Dilip Nazareth
- Department of Respiratory Medicine, Liverpool Heart and Chest Hospital NHS Foundation Trust, Liverpool, UK
- Institute of Infection and Global Health, University of Liverpool, Liverpool, UK
| | - Scott Hawkes
- Department of Pulmonary Physiology, Liverpool Heart and Chest Hospital NHS Foundation Trust, Liverpool, UK
| | - Matthew Shaw
- Research Department, Liverpool Heart and Chest Hospital NHS Foundation Trust, Liverpool, UK
| | - Paul Stephen McNamara
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, UK
- Department of Child Health (University of Liverpool), Institute in the Park, Alder Hey Children's Hospital NHS Foundation Trust, Liverpool, UK
| | - Martin Walshaw
- Department of Respiratory Medicine, Liverpool Heart and Chest Hospital NHS Foundation Trust, Liverpool, UK
- Institute of Infection and Global Health, University of Liverpool, Liverpool, UK
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12
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Vazquez Guillamet R, Rjob A, Bierhals A, Tague L, Marklin G, Halverson L, Witt C, Byers D, Hachem R, Gierada D, Brody SL, Takahashi T, Nava R, Kreisel D, Puri V, Trulock EP. Potential Role of Computed Tomography Volumetry in Size Matching in Lung Transplantation. Transplant Proc 2023; 55:432-439. [PMID: 36914438 PMCID: PMC10225152 DOI: 10.1016/j.transproceed.2023.02.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 02/02/2023] [Accepted: 02/03/2023] [Indexed: 03/14/2023]
Abstract
BACKGROUND Accumulated knowledge on the outcomes related to size mismatch in lung transplantation derives from predicted total lung capacity equations rather than individualized measurements of donors and recipients. The increasing availability of computed tomography (CT) makes it possible to measure the lung volumes of donors and recipients before transplantation. We hypothesize that CT-derived lung volumes predict a need for surgical graft reduction and primary graft dysfunction. METHODS Donors from the local organ procurement organization and recipients from our hospital from 2012 to 2018 were included if their CT exams were available. The CT lung volumes and plethysmography total lung capacity were measured and compared with predicted total lung capacity using Bland Altman methods. We used logistic regression to predict the need for surgical graft reduction and ordinal logistic regression to stratify the risk for primary graft dysfunction. RESULTS A total of 315 transplant candidates with 575 CT scans and 379 donors with 379 CT scans were included. The CT lung volumes closely approximated plethysmography lung volumes and differed from the predicted total lung capacity in transplant candidates. In donors, CT lung volumes systematically underestimated predicted total lung capacity. Ninety-four donors and recipients were matched and transplanted locally. Larger donor and smaller recipient lung volumes estimated by CT predicted a need for surgical graft reduction and were associated with higher primary graft dysfunction grade. CONCLUSION The CT lung volumes predicted the need for surgical graft reduction and primary graft dysfunction grade. Adding CT-derived lung volumes to the donor-recipient matching process may improve recipients' outcomes.
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Affiliation(s)
- Rodrigo Vazquez Guillamet
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Washington University, St Louis, Missouri.
| | - Ashraf Rjob
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Washington University, St Louis, Missouri
| | - Andrew Bierhals
- Mallinckrodt Institute of Radiology, Washington University, St Louis, Missouri
| | - Laneshia Tague
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Washington University, St Louis, Missouri
| | - Gary Marklin
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Washington University, St Louis, Missouri
| | - Laura Halverson
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Washington University, St Louis, Missouri
| | - Chad Witt
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Washington University, St Louis, Missouri
| | - Derek Byers
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Washington University, St Louis, Missouri
| | - Ramsey Hachem
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Washington University, St Louis, Missouri
| | - David Gierada
- Mallinckrodt Institute of Radiology, Washington University, St Louis, Missouri
| | - Steven L Brody
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Washington University, St Louis, Missouri; Mallinckrodt Institute of Radiology, Washington University, St Louis, Missouri
| | - Tsuyoshi Takahashi
- Department of Surgery, Division of Thoracic Surgery, Washington University, St Louis, Missouri
| | - Ruben Nava
- Department of Surgery, Division of Thoracic Surgery, Washington University, St Louis, Missouri
| | - Daniel Kreisel
- Department of Surgery, Division of Thoracic Surgery, Washington University, St Louis, Missouri
| | - Varun Puri
- Department of Surgery, Division of Thoracic Surgery, Washington University, St Louis, Missouri
| | - Elbert P Trulock
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Washington University, St Louis, Missouri
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13
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Avena-Zampieri CL, Hutter J, Rutherford M, Milan A, Hall M, Egloff A, Lloyd DFA, Nanda S, Greenough A, Story L. Assessment of the fetal lungs in utero. Am J Obstet Gynecol MFM 2022; 4:100693. [PMID: 35858660 PMCID: PMC9811184 DOI: 10.1016/j.ajogmf.2022.100693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 07/12/2022] [Accepted: 07/12/2022] [Indexed: 01/07/2023]
Abstract
Antenatal diagnosis of abnormal pulmonary development has improved significantly over recent years because of progress in imaging techniques. Two-dimensional ultrasound is the mainstay of investigation of pulmonary pathology during pregnancy, providing good prognostication in conditions such as congenital diaphragmatic hernia; however, it is less validated in other high-risk groups such as those with congenital pulmonary airway malformation or preterm premature rupture of membranes. Three-dimensional assessment of lung volume and size is now possible using ultrasound or magnetic resonance imaging; however, the use of these techniques is still limited because of unpredictable fetal motion, and such tools have also been inadequately validated in high-risk populations other than those with congenital diaphragmatic hernia. The advent of advanced, functional magnetic resonance imaging techniques such as diffusion and T2* imaging, and the development of postprocessing pipelines that facilitate motion correction, have enabled not only more accurate evaluation of pulmonary size, but also assessment of tissue microstructure and perfusion. In the future, fetal magnetic resonance imaging may have an increasing role in the prognostication of pulmonary abnormalities and in monitoring current and future antenatal therapies to enhance lung development. This review aims to examine the current imaging methods available for assessment of antenatal lung development and to outline possible future directions.
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Affiliation(s)
- Carla L Avena-Zampieri
- Department of Women and Children's Health, King's College London, London, United Kingdom; Centre for the Developing Brain, King's College London, London, United Kingdom
| | - Jana Hutter
- Centre for the Developing Brain, King's College London, London, United Kingdom
| | - Mary Rutherford
- Centre for the Developing Brain, King's College London, London, United Kingdom
| | - Anna Milan
- Neonatal Unit, Guy's and St Thomas' National Health Service Foundation Trust, London, United Kingdom
| | - Megan Hall
- Department of Women and Children's Health, King's College London, London, United Kingdom; Centre for the Developing Brain, King's College London, London, United Kingdom
| | - Alexia Egloff
- Centre for the Developing Brain, King's College London, London, United Kingdom
| | - David F A Lloyd
- Centre for the Developing Brain, King's College London, London, United Kingdom
| | - Surabhi Nanda
- Fetal Medicine Unit, Guy's and St Thomas' National Health Service Foundation Trust, London, United Kingdom
| | - Anne Greenough
- Department of Women and Children's Health, King's College London, London, United Kingdom; Neonatal Unit, King's College Hospital, London, United Kingdom; Asthma UK Centre in Allergic Mechanisms of Asthma, King's College London, London, United Kingdom; National Institute for Health and Care Research Biomedical Research Centre, Guy's & St Thomas National Health Service Foundation Trust and King's College London, London, United Kingdom
| | - Lisa Story
- Department of Women and Children's Health, King's College London, London, United Kingdom; Centre for the Developing Brain, King's College London, London, United Kingdom; Fetal Medicine Unit, Guy's and St Thomas' National Health Service Foundation Trust, London, United Kingdom.
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14
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Shafiq M, Polhemus E, Perkins R, Forth V, Marshall MB. Bilateral Bronchoscopic Lung Volume Reduction After Surgical Fissure Completion. Chest 2022; 162:e73-e75. [PMID: 35940665 DOI: 10.1016/j.chest.2022.02.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 01/28/2022] [Accepted: 02/07/2022] [Indexed: 11/17/2022] Open
Abstract
Although bilateral lung volume reduction surgery has been shown to be safe and effective in carefully selected patients with upper lobe-predominant emphysema and hyperinflation, bronchoscopic lung volume reduction via placement of endobronchial valves is conventionally performed only unilaterally. Furthermore, it is not offered to patients with interlobar collateral ventilation because of the lack of clinical efficacy. We describe two novel management approaches including (1) bilateral bronchoscopic lung volume reduction, and (2) a combined thoracic surgical and interventional pulmonary procedure involving surgical fissure completion followed by endobronchial valve placement, which culminated in safe and effective lung volume reduction of both lungs along with an excellent patient outcome.
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Affiliation(s)
- Majid Shafiq
- Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.
| | - Emily Polhemus
- Division of Thoracic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - Ryan Perkins
- Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - Victoria Forth
- Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - M Blair Marshall
- Division of Thoracic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
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15
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Su Y, Qiu ZS, Chen J, Ju MJ, Ma GG, He JW, Yu SJ, Liu K, Lure FYM, Tu GW, Zhang YY, Luo Z. Usage of compromised lung volume in monitoring steroid therapy on severe COVID-19. Respir Res 2022; 23:105. [PMID: 35488261 PMCID: PMC9051749 DOI: 10.1186/s12931-022-02025-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Accepted: 04/14/2022] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Quantitative computed tomography (QCT) analysis may serve as a tool for assessing the severity of coronavirus disease 2019 (COVID-19) and for monitoring its progress. The present study aimed to assess the association between steroid therapy and quantitative CT parameters in a longitudinal cohort with COVID-19. METHODS Between February 7 and February 17, 2020, 72 patients with severe COVID-19 were retrospectively enrolled. All 300 chest CT scans from these patients were collected and classified into five stages according to the interval between hospital admission and follow-up CT scans: Stage 1 (at admission); Stage 2 (3-7 days); Stage 3 (8-14 days); Stage 4 (15-21 days); and Stage 5 (22-31 days). QCT was performed using a threshold-based quantitative analysis to segment the lung according to different Hounsfield unit (HU) intervals. The primary outcomes were changes in percentage of compromised lung volume (%CL, - 500 to 100 HU) at different stages. Multivariate Generalized Estimating Equations were performed after adjusting for potential confounders. RESULTS Of 72 patients, 31 patients (43.1%) received steroid therapy. Steroid therapy was associated with a decrease in %CL (- 3.27% [95% CI, - 5.86 to - 0.68, P = 0.01]) after adjusting for duration and baseline %CL. Associations between steroid therapy and changes in %CL varied between different stages or baseline %CL (all interactions, P < 0.01). Steroid therapy was associated with decrease in %CL after stage 3 (all P < 0.05), but not at stage 2. Similarly, steroid therapy was associated with a more significant decrease in %CL in the high CL group (P < 0.05), but not in the low CL group. CONCLUSIONS Steroid administration was independently associated with a decrease in %CL, with interaction by duration or disease severity in a longitudinal cohort. The quantitative CT parameters, particularly compromised lung volume, may provide a useful tool to monitor COVID-19 progression during the treatment process. Trial registration Clinicaltrials.gov, NCT04953247. Registered July 7, 2021, https://clinicaltrials.gov/ct2/show/NCT04953247.
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Affiliation(s)
- Ying Su
- Department of Critical Care Medicine, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Ze-Song Qiu
- School of Information Science and Technology, ShanghaiTech University, Shanghai, China
| | - Jun Chen
- Department of Radiology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Min-Jie Ju
- Department of Critical Care Medicine, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Guo-Guang Ma
- Department of Critical Care Medicine, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Jin-Wei He
- School of Information Science and Technology, ShanghaiTech University, Shanghai, China
| | - Shen-Ji Yu
- Department of Critical Care Medicine, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Kai Liu
- Department of Critical Care Medicine, Zhongshan Hospital, Fudan University, Shanghai, China
| | | | - Guo-Wei Tu
- Department of Critical Care Medicine, Zhongshan Hospital, Fudan University, Shanghai, China.
| | - Yu-Yao Zhang
- School of Information Science and Technology, ShanghaiTech University, Shanghai, China.
| | - Zhe Luo
- Department of Critical Care Medicine, Zhongshan Hospital, Fudan University, Shanghai, China.
- Department of Critical Care Medicine, Xiamen Branch, Zhongshan Hospital, Fudan University, Xiamen, China.
- Shanghai Key Lab of Lung Inflammation and Injury, Shanghai, China.
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16
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Mingote Á, Albajar A, García Benedito P, Garcia-Suarez J, Pelosi P, Ball L, García-Fernández J. Prevalence and clinical consequences of atelectasis in SARS-CoV-2 pneumonia: a computed tomography retrospective cohort study. BMC Pulm Med 2021; 21:267. [PMID: 34404383 PMCID: PMC8369136 DOI: 10.1186/s12890-021-01638-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 08/11/2021] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND The aim of the study is to estimate the prevalence of atelectasis assessed with computer tomography (CT) in SARS-CoV-2 pneumonia and the relationship between the amount of atelectasis with oxygenation impairment, Intensive Care Unit admission rate and the length of in-hospital stay. PATIENTS AND METHODS Two-hundred thirty-seven patients admitted to the hospital with SARS-CoV-2 pneumonia diagnosed by clinical, radiology and molecular tests in the nasopharyngeal swab who underwent a chest computed tomography because of a respiratory worsening from Apr 1 to Apr 30, 2020 were included in the study. Patients were divided into three groups depending on the presence and amount of atelectasis at the computed tomography: no atelectasis, small atelectasis (< 5% of the estimated lung volume) or large atelectasis (> 5% of the estimated lung volume). In all patients, clinical severity, oxygen-therapy need, Intensive Care Unit admission rate, the length of in-hospital stay and in-hospital mortality data were collected. RESULTS Thirty patients (19%) showed small atelectasis while eight patients (5%) showed large atelectasis. One hundred and seventeen patients (76%) did not show atelectasis. Patients with large atelectasis compared to patients with small atelectasis had lower SatO2/FiO2 (182 vs 411 respectively, p = 0.01), needed more days of oxygen therapy (20 vs 5 days respectively, p = 0,02), more frequently Intensive Care Unit admission (75% vs 7% respectively, p < 0.01) and a longer period of hospitalization (40 vs 14 days respectively p < 0.01). CONCLUSION In patients with SARS-CoV-2 pneumonia, atelectasis might appear in up to 24% of patients and the presence of larger amount of atelectasis is associated with worse oxygenation and clinical outcome.
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Affiliation(s)
- Álvaro Mingote
- Anaesthesia, Critical Care Department and Pain Unit, Puerta de Hierro Universitary Hospital - Majadahonda, c/Manuel de Falla, 1, 28222, Madrid, Spain.
- Autonomous University of Madrid, Madrid, Spain.
| | - Andrea Albajar
- Anaesthesia, Critical Care Department and Pain Unit, Puerta de Hierro Universitary Hospital - Majadahonda, c/Manuel de Falla, 1, 28222, Madrid, Spain
| | | | - Jessica Garcia-Suarez
- Anaesthesia, Critical Care Department and Pain Unit, Puerta de Hierro Universitary Hospital - Majadahonda, c/Manuel de Falla, 1, 28222, Madrid, Spain
| | - Paolo Pelosi
- Department of Surgical Sciences and Integrated Diagnostics, University of Genoa, Genoa, Italy
- Anesthesia and Critical Care, IRCCS for Oncology and Neurosciences, San Martino Policlinico Hospital, Genoa, Italy
| | - Lorenzo Ball
- Department of Surgical Sciences and Integrated Diagnostics, University of Genoa, Genoa, Italy
- Anesthesia and Critical Care, IRCCS for Oncology and Neurosciences, San Martino Policlinico Hospital, Genoa, Italy
| | - Javier García-Fernández
- Anaesthesia, Critical Care Department and Pain Unit, Puerta de Hierro Universitary Hospital - Majadahonda, c/Manuel de Falla, 1, 28222, Madrid, Spain
- Autonomous University of Madrid, Madrid, Spain
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Messineo L, Perger E, Corda L, Joosten SA, Fanfulla F, Pedroni L, Terrill PI, Lombardi C, Wellman A, Hamilton GS, Malhotra A, Vailati G, Parati G, Sands SA. Breath-holding as a novel approach to risk stratification in COVID-19. Crit Care 2021; 25:208. [PMID: 34127052 PMCID: PMC8200551 DOI: 10.1186/s13054-021-03630-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Accepted: 06/06/2021] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Despite considerable progress, it remains unclear why some patients admitted for COVID-19 develop adverse outcomes while others recover spontaneously. Clues may lie with the predisposition to hypoxemia or unexpected absence of dyspnea ('silent hypoxemia') in some patients who later develop respiratory failure. Using a recently-validated breath-holding technique, we sought to test the hypothesis that gas exchange and ventilatory control deficits observed at admission are associated with subsequent adverse COVID-19 outcomes (composite primary outcome: non-invasive ventilatory support, intensive care admission, or death). METHODS Patients with COVID-19 (N = 50) performed breath-holds to obtain measurements reflecting the predisposition to oxygen desaturation (mean desaturation after 20-s) and reduced chemosensitivity to hypoxic-hypercapnia (including maximal breath-hold duration). Associations with the primary composite outcome were modeled adjusting for baseline oxygen saturation, obesity, sex, age, and prior cardiovascular disease. Healthy controls (N = 23) provided a normative comparison. RESULTS The adverse composite outcome (observed in N = 11/50) was associated with breath-holding measures at admission (likelihood ratio test, p = 0.020); specifically, greater mean desaturation (12-fold greater odds of adverse composite outcome with 4% compared with 2% desaturation, p = 0.002) and greater maximal breath-holding duration (2.7-fold greater odds per 10-s increase, p = 0.036). COVID-19 patients who did not develop the adverse composite outcome had similar mean desaturation to healthy controls. CONCLUSIONS Breath-holding offers a novel method to identify patients with high risk of respiratory failure in COVID-19. Greater breath-hold induced desaturation (gas exchange deficit) and greater breath-holding tolerance (ventilatory control deficit) may be independent harbingers of progression to severe disease.
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Affiliation(s)
- Ludovico Messineo
- Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham & Women's Hospital & Harvard Medical School, Boston, MA, USA.
- Adelaide Institute for Sleep Health (AISH), Flinders Health and Medical Research Institute (FHMRI), Flinders University, 5 Laffer Drive, Bedford Park, Adelaide, SA, 5043, Australia.
| | - Elisa Perger
- Istituto Auxologico Italiano IRCSS, Sleep Medicine Center, Department of Cardiology, San Luca Hospital, Milano, Italy
- Department of Medicine and Surgery, University of Milano-Bicocca, Milan, Italy
| | - Luciano Corda
- Respiratory Medicine and Sleep Laboratory, Department of Experimental and Clinical Sciences, University of Brescia and Spedali Civili, Brescia, Italy
- Department of Internal Medicine, Spedali Civili, Brescia, Italy
| | - Simon A Joosten
- Monash Lung and Sleep, Monash Medical Centre, Clayton, VIC, Australia
- School of Clinical Sciences, Monash University, Melbourne, VIC, Australia
- Monash Partners - Epworth, Victoria, Australia
| | | | - Leonardo Pedroni
- Respiratory Medicine and Sleep Laboratory, Department of Experimental and Clinical Sciences, University of Brescia and Spedali Civili, Brescia, Italy
| | - Philip I Terrill
- School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, Australia
| | - Carolina Lombardi
- Istituto Auxologico Italiano IRCSS, Sleep Medicine Center, Department of Cardiology, San Luca Hospital, Milano, Italy
- Department of Medicine and Surgery, University of Milano-Bicocca, Milan, Italy
| | - Andrew Wellman
- Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham & Women's Hospital & Harvard Medical School, Boston, MA, USA
| | - Garun S Hamilton
- Monash Lung and Sleep, Monash Medical Centre, Clayton, VIC, Australia
- School of Clinical Sciences, Monash University, Melbourne, VIC, Australia
- Monash Partners - Epworth, Victoria, Australia
| | - Atul Malhotra
- University of California San Diego, La Jolla, CA, USA
| | - Guido Vailati
- Respiratory Medicine and Sleep Laboratory, Department of Experimental and Clinical Sciences, University of Brescia and Spedali Civili, Brescia, Italy
| | - Gianfranco Parati
- Istituto Auxologico Italiano IRCSS, Sleep Medicine Center, Department of Cardiology, San Luca Hospital, Milano, Italy
- Department of Medicine and Surgery, University of Milano-Bicocca, Milan, Italy
| | - Scott A Sands
- Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham & Women's Hospital & Harvard Medical School, Boston, MA, USA
- Department of Allergy Immunology and Respiratory Medicine and Central Clinical School, The Alfred and Monash University, Melbourne, Australia
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Alves AFF, Miranda JRA, Reis F, Oliveira AA, Souza SAS, Fortaleza CMCB, Tanni SE, Castro JTS, Pina DR. Automatic algorithm for quantifying lung involvement in patients with chronic obstructive pulmonary disease, infection with SARS-CoV-2, paracoccidioidomycosis and no lung disease patients. PLoS One 2021; 16:e0251783. [PMID: 34111131 PMCID: PMC8191897 DOI: 10.1371/journal.pone.0251783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 05/03/2021] [Indexed: 11/19/2022] Open
Abstract
In this work, we aimed to develop an automatic algorithm for the quantification of total volume and lung impairments in four different diseases. The quantification was completely automatic based upon high resolution computed tomography exams. The algorithm was capable of measuring volume and differentiating pulmonary involvement including inflammatory process and fibrosis, emphysema, and ground-glass opacities. The algorithm classifies the percentage of each pulmonary involvement when compared to the entire lung volume. Our algorithm was applied to four different patients groups: no lung disease patients, patients diagnosed with SARS-CoV-2, patients with chronic obstructive pulmonary disease, and patients with paracoccidioidomycosis. The quantification results were compared with a semi-automatic algorithm previously validated. Results confirmed that the automatic approach has a good agreement with the semi-automatic. Bland-Altman (B&A) demonstrated a low dispersion when comparing total lung volume, and also when comparing each lung impairment individually. Linear regression adjustment achieved an R value of 0.81 when comparing total lung volume between both methods. Our approach provides a reliable quantification process for physicians, thus impairments measurements contributes to support prognostic decisions in important lung diseases including the infection of SARS-CoV-2.
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Affiliation(s)
- Allan Felipe Fattori Alves
- Botucatu Medical School, Clinics Hospital, Medical Physics and Radioprotection Nucleus, Botucatu, SP, Brazil
| | | | - Fabiano Reis
- Radiology and Medical Imaging, State University of Campinas, Campinas, SP, Brazil
| | - Abner Alves Oliveira
- Institute of Bioscience, Sao Paulo State University Julio de Mesquita Filho, Botucatu, SP, Brazil
| | | | | | - Suzana Erico Tanni
- Medical School, Sao Paulo State University Julio de Mesquita Filho, Botucatu, SP, Brazil
| | | | - Diana Rodrigues Pina
- Medical School, Sao Paulo State University Julio de Mesquita Filho, Botucatu, SP, Brazil
- * E-mail:
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Berger KI, Adam O, Dal Negro RW, Kaminsky DA, Shiner RJ, Burgos F, de Jongh FHC, Cohen I, Fredberg JJ. Validation of a Novel Compact System for the Measurement of Lung Volumes. Chest 2021; 159:2356-2365. [PMID: 33539839 PMCID: PMC8411450 DOI: 10.1016/j.chest.2021.01.052] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 01/04/2021] [Accepted: 01/09/2021] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Current techniques for measuring absolute lung volumes rely on bulky and expensive equipment and are complicated to use for the operator and the patient. A novel method for measurement of absolute lung volumes, the MiniBox method, is presented. RESEARCH QUESTION Across a population of patients and healthy participants, do values for total lung capacity (TLC) determined by the novel compact device (MiniBox, PulmOne Advanced Medical Devices, Ltd.) compare favorably with measurements determined by traditional whole body plethysmography? STUDY DESIGN AND METHODS A total of 266 participants (130 men) and respiratory patients were recruited from five global centers (three in Europe and two in the United States). The study population comprised individuals with obstructive (n = 197) and restrictive (n = 33) disorders as well as healthy participants (n = 36). TLC measured by conventional plethysmography (TLCPleth) was compared with TLC measured by the MiniBox (TLCMB). RESULTS TLC values ranged between 2.7 and 10.9 L. The normalized root mean square difference (NSD) between TLCPleth and TLCMB was 7.0% in healthy participants. In obstructed patients, the NSD was 7.9% in mild obstruction and 9.1% in severe obstruction. In restricted patients, the NSD was 7.8% in mild restriction and 13.9% in moderate and severe restriction. No significant differences were found between TLC values obtained by the two measurement techniques. Also no significant differences were found in results obtained among the five centers. INTERPRETATION TLC as measured by the novel MiniBox system is not significantly different from TLC measured by conventional whole body plethysmography, thus validating the MiniBox method as a reliable method to measure absolute lung volumes.
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Affiliation(s)
- Kenneth I Berger
- Division of Pulmonary Critical Care and Sleep Medicine, NYU Grossman School of Medicine, Bellevue Hospital, New York, NY; André Cournand Pulmonary Physiology Laboratory, Bellevue Hospital, New York, NY.
| | - Ori Adam
- Institute of Earth Sciences, Hebrew University, Jerusalem, Israel
| | - Roberto Walter Dal Negro
- Centro Nazionale Studi di Farmacoeconomia e Farmacoepidemiologia Respiratoria, CESFAR, Verona, Italy
| | - David A Kaminsky
- Pulmonary and Critical Care Medicine, The University of Vermont Larner College of Medicine, Burlington, VT
| | | | - Felip Burgos
- Servicio de Pneumologia, Hospital Clínic, Instituto de Investigaciones Biomédicas August Pi i Sunyer (IDIBAPS), University of Barcelona, Barcelona, Spain
| | - Frans H C de Jongh
- Department of Pulmonary Function, Medisch Spectrum Twente, Enschede, The Netherlands
| | - Inon Cohen
- Division of Pulmonary Critical Care and Sleep Medicine, NYU Grossman School of Medicine, Bellevue Hospital, New York, NY
| | - Jeffrey J Fredberg
- Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, MA
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Khan A, Markus A, Rittmann T, Albers J, Alves F, Hülsmann S, Dullin C. Simple low dose radiography allows precise lung volume assessment in mice. Sci Rep 2021; 11:4163. [PMID: 33602964 PMCID: PMC7893164 DOI: 10.1038/s41598-021-83319-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 01/08/2021] [Indexed: 02/07/2023] Open
Abstract
X-ray based lung function (XLF) as a planar method uses dramatically less X-ray dose than computed tomography (CT) but so far lacked the ability to relate its parameters to pulmonary air volume. The purpose of this study was to calibrate the functional constituents of XLF that are biomedically decipherable and directly comparable to that of micro-CT and whole-body plethysmography (WBP). Here, we developed a unique set-up for simultaneous assessment of lung function and volume using XLF, micro-CT and WBP on healthy mice. Our results reveal a strong correlation of lung volumes obtained from radiographic XLF and micro-CT and demonstrate that XLF is superior to WBP in sensitivity and precision to assess lung volumes. Importantly, XLF measurement uses only a fraction of the radiation dose and acquisition time required for CT. Therefore, the redefined XLF approach is a promising tool for preclinical longitudinal studies with a substantial potential of clinical translation.
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Affiliation(s)
- Amara Khan
- Translational Molecular Imaging, Max-Planck-Institute for Experimental Medicine, Hermann-Rein-Straße 3, 37075, Göttingen, Germany
| | - Andrea Markus
- Translational Molecular Imaging, Max-Planck-Institute for Experimental Medicine, Hermann-Rein-Straße 3, 37075, Göttingen, Germany
| | - Thomas Rittmann
- 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Friedrich-Hund-Platz 1, 37077, Göttingen, Germany
| | - Jonas Albers
- Translational Molecular Imaging, Max-Planck-Institute for Experimental Medicine, Hermann-Rein-Straße 3, 37075, Göttingen, Germany
- Institute for Diagnostic and Interventional Radiology, University Medical Center Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
| | - Frauke Alves
- Translational Molecular Imaging, Max-Planck-Institute for Experimental Medicine, Hermann-Rein-Straße 3, 37075, Göttingen, Germany
- Institute for Diagnostic and Interventional Radiology, University Medical Center Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- Clinic for Hematology and Medical Oncology, University Medical Center Göttingen, Robert-Koch-Str. 40, 37075, Göttingen, Germany
| | - Swen Hülsmann
- Clinic for Anesthesiology, University Medical Center Göttingen, Humboldtallee 23, 37073, Göttingen, Germany
| | - Christian Dullin
- Translational Molecular Imaging, Max-Planck-Institute for Experimental Medicine, Hermann-Rein-Straße 3, 37075, Göttingen, Germany.
- Institute for Diagnostic and Interventional Radiology, University Medical Center Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany.
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21
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Pippard BJ, Neal MA, Maunder AM, Hollingsworth KG, Biancardi A, Lawson RA, Fisher H, Matthews JNS, Simpson AJ, Wild JM, Thelwall PE. Reproducibility of 19 F-MR ventilation imaging in healthy volunteers. Magn Reson Med 2021; 85:3343-3352. [PMID: 33507591 PMCID: PMC7986730 DOI: 10.1002/mrm.28660] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 12/07/2020] [Accepted: 12/07/2020] [Indexed: 01/23/2023]
Abstract
Purpose To assess the reproducibility of percentage ventilated lung volume (%VV) measurements in healthy volunteers acquired by fluorine (19F)‐MRI of inhaled perfluoropropane, implemented at two research sites. Methods In this prospective, ethically approved study, 40 healthy participants were recruited (May 2018‐June 2019) to one of two research sites. Participants underwent a single MRI scan session on a 3T scanner, involving periodic inhalation of a 79% perfluoropropane/21% oxygen gas mixture. Each gas inhalation session lasted about 30 seconds, consisting of three deep breaths of gas followed by a breath‐hold. Four 19F‐MR ventilation images were acquired per participant, each separated by approximately 6 minutes. The value of %VV was determined by registering separately acquired 1H images to ventilation images before semi‐automated image segmentation, performed independently by two observers. Reproducibility of %VV measurements was assessed by components of variance, intraclass correlation coefficients, coefficients of variation (CoV), and the Dice similarity coefficient. Results The MRI scans were well tolerated throughout, with no adverse events. There was a high degree of consistency in %VV measurements for each participant (CoVobserver1 = 0.43%; CoVobserver2 = 0.63%), with overall precision of %VV measurements determined to be within ± 1.7% (95% confidence interval). Interobserver agreement in %VV measurements revealed a high mean Dice similarity coefficient (SD) of 0.97 (0.02), with only minor discrepancies between observers. Conclusion We demonstrate good reproducibility of %VV measurements in a group of healthy participants using 19F‐MRI of inhaled perfluoropropane. Our methods have been successfully implemented across two different study sites, supporting the feasibility of performing larger multicenter clinical studies.
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Affiliation(s)
- Benjamin J. Pippard
- Newcastle Magnetic Resonance CentreNewcastle UniversityNewcastle upon TyneUnited Kingdom
- Translational and Clinical Research InstituteNewcastle UniversityNewcastle upon TyneUnited Kingdom
| | - Mary A. Neal
- Newcastle Magnetic Resonance CentreNewcastle UniversityNewcastle upon TyneUnited Kingdom
- Translational and Clinical Research InstituteNewcastle UniversityNewcastle upon TyneUnited Kingdom
| | - Adam M. Maunder
- POLARIS, Department of IICDUniversity of SheffieldRoyal Hallamshire HospitalSheffieldUnited Kingdom
| | - Kieren G. Hollingsworth
- Newcastle Magnetic Resonance CentreNewcastle UniversityNewcastle upon TyneUnited Kingdom
- Translational and Clinical Research InstituteNewcastle UniversityNewcastle upon TyneUnited Kingdom
| | - Alberto Biancardi
- POLARIS, Department of IICDUniversity of SheffieldRoyal Hallamshire HospitalSheffieldUnited Kingdom
| | - Rod A. Lawson
- Respiratory MedicineSheffield Teaching Hospitals National Health Service Foundation TrustSheffieldUnited Kingdom
| | - Holly Fisher
- Population Health Sciences InstituteNewcastle UniversityNewcastle upon TyneUnited Kingdom
| | - John N. S. Matthews
- Population Health Sciences InstituteNewcastle UniversityNewcastle upon TyneUnited Kingdom
- School of Mathematics, Statistics and PhysicsNewcastle UniversityNewcastle upon TyneUnited Kingdom
| | - A. John Simpson
- Translational and Clinical Research InstituteNewcastle UniversityNewcastle upon TyneUnited Kingdom
- Respiratory MedicineNewcastle upon Tyne Hospitals National Health Service Foundation TrustNewcastle upon TyneUnited Kingdom
| | - Jim M. Wild
- POLARIS, Department of IICDUniversity of SheffieldRoyal Hallamshire HospitalSheffieldUnited Kingdom
| | - Peter E. Thelwall
- Newcastle Magnetic Resonance CentreNewcastle UniversityNewcastle upon TyneUnited Kingdom
- Translational and Clinical Research InstituteNewcastle UniversityNewcastle upon TyneUnited Kingdom
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22
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Strozza D, Wilhite DP, Babb TG, Bhammar DM. Pitfalls in Expiratory Flow Limitation Assessment at Peak Exercise in Children: Role of Thoracic Gas Compression. Med Sci Sports Exerc 2020; 52:2310-2319. [PMID: 33064406 PMCID: PMC7573195 DOI: 10.1249/mss.0000000000002378] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PURPOSE Thoracic gas compression and exercise-induced bronchodilation can influence the assessment of expiratory flow limitation (EFL) during cardiopulmonary exercise tests. The purpose of this study was to examine the effect of thoracic gas compression and exercise-induced bronchodilation on the assessment of EFL in children with and without obesity. METHODS Forty children (10.7 ± 1.0 yr; 27 obese; 15 with EFL) completed pulmonary function tests and incremental exercise tests. Inspiratory capacity maneuvers were performed during the incremental exercise test for the placement of tidal flow volume loops within the maximal expiratory flow volume (MEFV) loops, and EFL was calculated as the overlap between the tidal and the MEFV loops. MEFV loops were plotted with volume measured at the lung using plethysmography (MEFVp), with volume measured at the mouth using spirometry concurrent with measurements in the plethysmograph (MEFVm), and from spirometry before (MEFVpre) and after (MEFVpost) the incremental exercise test. Only the MEFVp loops were corrected for thoracic gas compression. RESULTS Not correcting for thoracic gas compression resulted in incorrect diagnosis of EFL in 23% of children at peak exercise. EFL was 26% ± 15% VT higher for MEFVm compared with MEFVp (P < 0.001), with no differences between children with and without obesity (P = 0.833). The difference in EFL estimation using MEFVpre (37% ± 30% VT) and MEFVpost (31% ± 26% VT) did not reach statistical significance (P = 0.346). CONCLUSIONS Not correcting the MEFV loops for thoracic gas compression leads to the overdiagnosis and overestimation of EFL. Because most commercially available metabolic measurement systems do not correct for thoracic gas compression during spirometry, there may be a significant overdiagnosis of EFL in cardiopulmonary exercise testing. Therefore, clinicians must exercise caution while interpreting EFL when the MEFV loop is derived through spirometry.
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Affiliation(s)
- Danielle Strozza
- School of Medicine, University of Nevada Las Vegas, Las Vegas, NV
| | - Daniel P. Wilhite
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas and UT Southwestern Medical Center, Dallas, TX
| | - Tony G. Babb
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas and UT Southwestern Medical Center, Dallas, TX
| | - Dharini M. Bhammar
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas and UT Southwestern Medical Center, Dallas, TX
- Department of Kinesiology and Nutrition Sciences, School of Integrated Health Sciences, University of Nevada Las Vegas, Las Vegas, NV
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23
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Verleden SE, Kirby M, Everaerts S, Vanstapel A, McDonough JE, Verbeken EK, Braubach P, Boone MN, Aslam D, Verschakelen J, Ceulemans LJ, Neyrinck AP, Van Raemdonck DE, Vos R, Decramer M, Hackett TL, Hogg JC, Janssens W, Verleden GM, Vanaudenaerde BM. Small airway loss in the physiologically ageing lung: a cross-sectional study in unused donor lungs. Lancet Respir Med 2020; 9:167-174. [PMID: 33031747 DOI: 10.1016/s2213-2600(20)30324-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 07/01/2020] [Accepted: 07/01/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND Physiological lung ageing is associated with a gradual decline in dynamic lung volumes and a progressive increase in residual volume due to diminished elastic recoil of the lung, loss of alveolar tissue, and lower chest wall compliance. However, the effects of ageing on the small airways (ie, airways <2·0 mm in diameter) remain largely unknown. By using a combination of ex-vivo conventional CT (resolution 1 mm), whole lung micro-CT (resolution 150 μm), and micro-CT of extracted cores (resolution 10 μm), we aimed to provide a multiresolution assessment of the small airways in lung ageing in a large cohort of never smokers. METHODS For this cross-sectional study, we included donor lungs collected from 32 deceased never-smoking donors (age range 16-83 years). Ex-vivo CT and whole lung high-resolution CT (micro-CT) were used to determine total airway numbers, stratified by airway diameter. Micro-CT was used to assess the number, length, and diameter of terminal bronchioles (ie, the last generation of conducting airways); mean linear intercept; and surface density in four lung tissue cores from each lung, extracted using a uniform sampling approach. Regression β coefficients are calculated using linear regression and polynomial models. FINDINGS Ex-vivo CT analysis showed an age-dependent decrease in the number of airways of diameter 2·0 mm to less than 2·5 mm (β coefficient per decade -0·119, 95% CI -0·193 to -0·045; R2=0·29) and especially in airways smaller than 2·0 mm in diameter (-0·158, -0·233 to -0·084; R2=0·47), between 30 and 80 years of age, but not of the larger (≥2·5 mm) diameter airways (-0·00781, -0·04409 to 0·02848; R2=0·0007). In micro-CT analysis of small airways, the total number of terminal bronchioles per lung increased until the age of 30 years, after which an almost linear decline in the number of terminal bronchioles was observed (β coefficient per decade -2035, 95% CI -2818 to -1252; R2=0·55), accompanied by a non-significant increase in alveolar airspace size (6·44, -0·57 to 13·45, R2=0·10). Moreover, this decrease in terminal bronchioles was associated with the age-related decline of pulmonary function predicted by healthy reference values. INTERPRETATION Loss of terminal bronchioles is an important structural component of age-related decline in pulmonary function of healthy, non-smoking individuals. FUNDING Research Foundation-Flanders, KU Leuven, Parker B Francis Foundation, UGent, Canadian Institutes for Health.
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Affiliation(s)
- Stijn E Verleden
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), Department of Chronic diseases, Metabolism and Aging (CHROMETA), KU Leuven, Leuven, Belgium.
| | - Miranda Kirby
- Department of Physics, Ryerson University, Toronto, ON, Canada
| | - Stephanie Everaerts
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), Department of Chronic diseases, Metabolism and Aging (CHROMETA), KU Leuven, Leuven, Belgium
| | - Arno Vanstapel
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), Department of Chronic diseases, Metabolism and Aging (CHROMETA), KU Leuven, Leuven, Belgium
| | - John E McDonough
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), Department of Chronic diseases, Metabolism and Aging (CHROMETA), KU Leuven, Leuven, Belgium
| | - Erik K Verbeken
- Department of Imaging and Pathology, KU Leuven, Leuven, Belgium
| | - Peter Braubach
- Institute for Pathology, Hannover Medical School, Hannover, Germany
| | - Matthieu N Boone
- Department of Physics and Astronomy, Radiation Physics-Centre for X-ray Tomography, Ghent University, Ghent, Belgium
| | - Danesh Aslam
- Department of Physics, Ryerson University, Toronto, ON, Canada
| | | | - Laurens J Ceulemans
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), Department of Chronic diseases, Metabolism and Aging (CHROMETA), KU Leuven, Leuven, Belgium
| | - Arne P Neyrinck
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Dirk E Van Raemdonck
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), Department of Chronic diseases, Metabolism and Aging (CHROMETA), KU Leuven, Leuven, Belgium
| | - Robin Vos
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), Department of Chronic diseases, Metabolism and Aging (CHROMETA), KU Leuven, Leuven, Belgium
| | - Marc Decramer
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), Department of Chronic diseases, Metabolism and Aging (CHROMETA), KU Leuven, Leuven, Belgium
| | - Tillie L Hackett
- Centre for Heart Lung Innovation, St Paul's Hospital, Vancouver, BC, Canada
| | - James C Hogg
- Centre for Heart Lung Innovation, St Paul's Hospital, Vancouver, BC, Canada
| | - Wim Janssens
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), Department of Chronic diseases, Metabolism and Aging (CHROMETA), KU Leuven, Leuven, Belgium
| | - Geert M Verleden
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), Department of Chronic diseases, Metabolism and Aging (CHROMETA), KU Leuven, Leuven, Belgium
| | - Bart M Vanaudenaerde
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), Department of Chronic diseases, Metabolism and Aging (CHROMETA), KU Leuven, Leuven, Belgium
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24
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Gustafsson PM, Kadar L, Kjellberg S, Andersson L, Lindblad A, Robinson PD. End-expiratory lung volume remains stable during N 2 MBW in healthy sleeping infants. Physiol Rep 2020; 8:e14477. [PMID: 32845567 PMCID: PMC7448799 DOI: 10.14814/phy2.14477] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 05/13/2020] [Indexed: 11/24/2022] Open
Abstract
We have previously shown that functional residual capacity (FRC) and lung clearance index were significantly greater in sleeping healthy infants when measured by N2 (nitrogen) washout using 100% O2 (oxygen) versus 4% SF6 (sulfur hexafluoride) washout using air. Following 100% O2 exposure, tidal volumes decreased by over 30%, while end-expiratory lung volume (EELV, i.e., FRC) rose markedly based on ultrasonic flow meter assessments. In the present study to investigate the mechanism behind the observed changes, N2 MBW was performed in 10 separate healthy full-term spontaneously sleeping infants, mean (range) 26 (18-31) weeks, with simultaneous EELV monitoring (respiratory inductance plethysmography, RIP) and oxygen uptake (V´O2 ) assessment during prephase air breathing, during N2 washout by exposure to 100% O2 , and subsequently during air breathing. While flow meter signals suggested a rise in ELLV by mean (SD) 26 (9) ml over the washout period, RIP signals demonstrated no EELV change. V'O2 /FRC ratio during air breathing was mean (SD) 0.43 (0.08)/min, approximately seven times higher than that calculated from adult data. We propose that our previously reported flow meter-based overestimation of EELV was in fact a physiological artifact caused by rapid and marked movement of O2 across the alveolar capillary membrane into the blood and tissue during 100% O2 exposure, without concomitant transfer of N2 to the same degree in the opposite direction. This may be driven by the high observed O2 consumption and resulting cardiac output encountered in infancy. Furthermore, the low resting lung volume in infancy may make this error in lung volume determination by N2 washout relatively large.
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Affiliation(s)
- Per M. Gustafsson
- Department of PediatricsCentral HospitalSkövdeSweden
- The Sahlgrenska Academy at the University of GothenburgGothenburgSweden
| | - Laszlo Kadar
- Department of PediatricsCentral HospitalSkövdeSweden
| | | | | | - Anders Lindblad
- The Sahlgrenska Academy at the University of GothenburgGothenburgSweden
- CF CentreQueen Silvia Children's HospitalGothenburgSweden
| | - Paul D. Robinson
- Department of Respiratory MedicineThe Children’s Hospital at WestmeadSydneyNSWAustralia
- Discipline of Paediatrics and Child HealthSydney Medical SchoolUniversity of SydneySydneyNSWAustralia
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Cebeci H, Kılınçer A, Özlü MY, Öztürk M, Öncel M, Sunam GS. The effect of pectus excavatum deformity on lung volume: fact or myth? Surg Radiol Anat 2020; 42:1287-1292. [PMID: 32495037 DOI: 10.1007/s00276-020-02512-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 05/29/2020] [Indexed: 10/24/2022]
Abstract
BACKGROUND AND PURPOSE Most of the previous studies evaluating lung volume of pectus excavatum (PE) patients were based on spirometric measurements. We aimed to calculate lung volume of patients with PE and compare them with lung volume of patients without chest wall deformity using CT volumetry. METHODS After institutional review board approval, preoperative chest CT of PE patients who underwent minimal invasive procedure between January 2012 and February 2018, were evaluated retrospectively. As a control group, age and sex matched patients who underwent chest CT scan in the same period were enrolled. Total, right and left lung volumes were calculated using an automated software. Haller indexes were measured for both groups. Lung volumes and Haller indexes compared between the two groups. We also compared left and right lung volumes in both groups. We evaluated whether there is a correlation across the Haller index and total lung volume. RESULTS Total, right and left lung volumes were not statistically different between the two groups. While left lung volumes were significantly smaller in PE group (p = 0.041), there was no significant difference between the left and right lung volume in the control group (p = 0.12). Haller index and total lung volume showed no significant correlation between patients with the same age and gender (p = 0.14, R = -0.3). CONCLUSIONS PE deformity does not reduce lung volume when compared to age and sex matched control group. Quantitative CT volumetric evaluation of lung gives valuable data about lung volume.
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Affiliation(s)
- Hakan Cebeci
- Department of Radiology, Faculty of Medicine, Selçuk University, 42130, Konya, Turkey
| | - Abidin Kılınçer
- Department of Radiology, Faculty of Medicine, Selçuk University, 42130, Konya, Turkey.
| | - Mustafa Yasir Özlü
- Department of Radiology, Faculty of Medicine, Selçuk University, 42130, Konya, Turkey
| | - Mehmet Öztürk
- Department of Radiology, Faculty of Medicine, Selçuk University, 42130, Konya, Turkey
| | - Murat Öncel
- Department of Thoracic Surgery, Faculty of Medicine, Selçuk University, Konya, Turkey
| | - Güven Sadi Sunam
- Department of Thoracic Surgery, Faculty of Medicine, Selçuk University, Konya, Turkey
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Blanco-Almazán D, Groenendaal W, Catthoor F, Jané R. Chest Movement and Respiratory Volume both Contribute to Thoracic Bioimpedance during Loaded Breathing. Sci Rep 2019; 9:20232. [PMID: 31882841 PMCID: PMC6934864 DOI: 10.1038/s41598-019-56588-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 12/10/2019] [Indexed: 11/22/2022] Open
Abstract
Bioimpedance has been widely studied as alternative to respiratory monitoring methods because of its linear relationship with respiratory volume during normal breathing. However, other body tissues and fluids contribute to the bioimpedance measurement. The objective of this study is to investigate the relevance of chest movement in thoracic bioimpedance contributions to evaluate the applicability of bioimpedance for respiratory monitoring. We measured airflow, bioimpedance at four electrode configurations and thoracic accelerometer data in 10 healthy subjects during inspiratory loading. This protocol permitted us to study the contributions during different levels of inspiratory muscle activity. We used chest movement and volume signals to characterize the bioimpedance signal using linear mixed-effect models and neural networks for each subject and level of muscle activity. The performance was evaluated using the Mean Average Percentage Errors for each respiratory cycle. The lowest errors corresponded to the combination of chest movement and volume for both linear models and neural networks. Particularly, neural networks presented lower errors (median below 4.29%). At high levels of muscle activity, the differences in model performance indicated an increased contribution of chest movement to the bioimpedance signal. Accordingly, chest movement contributed substantially to bioimpedance measurement and more notably at high muscle activity levels.
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Affiliation(s)
- Dolores Blanco-Almazán
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Baldiri Reixac 10-12, 08028, Barcelona, Spain.
- Universitat Politècnica de Catalunya · BarcelonaTech (UPC), Barcelona, Spain.
- Biomedical Research Networking Centre in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain.
| | - Willemijn Groenendaal
- imec the Netherlands/Holst Centre, High tech campus 31, 5656AE, Eindhoven, The Netherlands
| | | | - Raimon Jané
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Baldiri Reixac 10-12, 08028, Barcelona, Spain
- Universitat Politècnica de Catalunya · BarcelonaTech (UPC), Barcelona, Spain
- Biomedical Research Networking Centre in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain
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Sonpeayung R, Tantisuwat A, Janwantanakul P, Thaveeratitham P. Total and Compartmental Chest Wall Volumes, Lung Function, and Respiratory Muscle Strength in Individuals with Abdominal Obesity: Effects of Body Positions. J Obes 2019; 2019:9539846. [PMID: 31934446 PMCID: PMC6942872 DOI: 10.1155/2019/9539846] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 11/16/2019] [Accepted: 11/25/2019] [Indexed: 01/07/2023] Open
Abstract
Background Abdominal obesity is a chronic condition that can contribute to impairments in lung function, leading to increased risks for respiratory-related diseases. Body position is an important technique that effectively restores and increases lung function and chest wall volumes. The objective of the current study was to examine the effects of the body positions on total and compartmental chest wall volumes, lung function, and respiratory muscle strength in individuals with and without abdominal obesity. Methods Twenty obesity and twenty healthy males performed in four body position including sitting without and with back support, Fowler's, and supine positions. Each position was performed for five minutes. Chest wall volumes, lung function, and respiratory muscle strength were assessed in each position. Results Sitting without and with back support resulted in higher total and rib cage compartmental chest wall volumes, lung function, and inspiratory muscle strength than Fowler's and supine positions in both groups (p < 0.001). Abdominal obesity subjects had significantly less total and compartmental chest wall volumes and lung function across four body positions than healthy subjects (p < 0.001). Respiratory muscle strength in the obesity group was less than that in the healthy control group (p > 0.05). Conclusions This study provides new information regarding the effect of obesity and body position on chest wall volumes, lung function, and respiratory muscle strength. Among obesity individuals who are bedridden, sitting increases lung function, total and rib cage compartmental chest wall volumes, and inspiratory muscle strength-and would therefore likely to decrease the risk of respiratory-related disease-relative to Fowler's and supine positions.
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Affiliation(s)
- Rattanaporn Sonpeayung
- Department of Physical Therapy, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand
| | - Anong Tantisuwat
- Department of Physical Therapy, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand
| | - Prawit Janwantanakul
- Department of Physical Therapy, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand
| | - Premtip Thaveeratitham
- Department of Physical Therapy, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand
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Eyerly-Webb S, Nicolas CT, Watson D, Dion E, Amin R, Wagner AJ, Lampland A, Bendel-Stenzel E, Macardle CA, Kunisaki SM, Jorgenson A, Lillegard J, Feltis B. Dynamic discriminant model for predicting respiratory distress at birth based on mass volume ratio in fetuses with congenital lung malformation. Ultrasound Obstet Gynecol 2019; 54:759-766. [PMID: 30834623 DOI: 10.1002/uog.20255] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 02/13/2019] [Accepted: 02/22/2019] [Indexed: 06/09/2023]
Abstract
OBJECTIVES The congenital lung malformation volume ratio (CVR) is a prenatal ultrasound measurement that parameterizes congenital lung malformation (CLM) size. The aims of this study were to use serial measurements to create estimated growth curves of fetal CVR for asymptomatic and symptomatic neonates with CLM and to investigate whether a discriminant prognostic model based on these measurements could predict accurately which fetuses with CLM will require invasive respiratory support at delivery and should therefore be delivered at a tertiary-care facility. METHODS This was a retrospective study of fetuses diagnosed prenatally with CLM at three tertiary-care children's hospitals between 2009 and 2016. Those with two or more sonographic measurements of CVR were included. Serial fetal CVR measurements were used to create estimated growth curves for neonates with and those without respiratory symptoms at delivery, defined as requiring invasive respiratory support for the first 24 h after delivery. A discriminant model based on serial CVR measurements was used to calculate the dynamic probability of the need for invasive respiratory support. The performance of this model overall and in preterm and term neonates was compared with those using maximum CVR thresholds of 1.0 and 1.6. RESULTS Of the 147 neonates meeting the inclusion criteria, 16 (10.9%) required postnatal invasive respiratory support. The estimated CVR growth curve models showed different growth trajectories for asymptomatic and symptomatic neonates, with significantly higher CVR in symptomatic neonates, and values peaking late in the second trimester at around 25 weeks' gestation in asymptomatic neonates. All prognostic methods had high accuracy for the prediction of the need for invasive respiratory support in term neonates, but the discriminant model had the best performance overall (area under the receiver-operating characteristics curve (AUC) = 0.88) and in the preterm population (AUC = 0.85). CONCLUSIONS The estimated CVR growth curves showed different growth patterns in asymptomatic and symptomatic neonates with CLM. The dynamic discriminant model performed well overall and particularly in neonates that were carried to term. Development of an externally validated clinical tool based on this analysis could be useful in determining the site of delivery for fetuses with CLM. Copyright © 2019 ISUOG. Published by John Wiley & Sons Ltd.
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Affiliation(s)
- S Eyerly-Webb
- Children's Hospitals and Clinics of Minnesota, Midwest Fetal Care Center, Minneapolis, MN, USA
- University of Minnesota Medical School, Minneapolis, MN, USA
| | - C T Nicolas
- Children's Hospitals and Clinics of Minnesota, Midwest Fetal Care Center, Minneapolis, MN, USA
- Mayo Clinic, Division of General Surgery Research, Rochester, MN, USA
| | - D Watson
- Children's Hospitals and Clinics of Minnesota, Research Design and Analytics, Minneapolis, MN, USA
| | - E Dion
- Children's Hospitals and Clinics of Minnesota, Midwest Fetal Care Center, Minneapolis, MN, USA
| | - R Amin
- Medical College of Wisconsin, Milwaukee, WI, USA
| | - A J Wagner
- Children's Hospital of Wisconsin, Milwaukee, WI, USA
| | - A Lampland
- Children's Hospitals and Clinics of Minnesota, Midwest Fetal Care Center, Minneapolis, MN, USA
| | - E Bendel-Stenzel
- Children's Hospitals and Clinics of Minnesota, Midwest Fetal Care Center, Minneapolis, MN, USA
| | - C A Macardle
- St Joseph Mercy Health System, Ypsilanti, MI, USA
| | - S M Kunisaki
- Johns Hopkins Children's Center, Baltimore, MD, USA
| | - A Jorgenson
- Children's Hospitals and Clinics of Minnesota, Midwest Fetal Care Center, Minneapolis, MN, USA
| | - J Lillegard
- Children's Hospitals and Clinics of Minnesota, Midwest Fetal Care Center, Minneapolis, MN, USA
- Mayo Clinic, Division of General Surgery Research, Rochester, MN, USA
- Pediatric Surgical Associates, Minneapolis, MN, USA
| | - B Feltis
- Children's Hospitals and Clinics of Minnesota, Midwest Fetal Care Center, Minneapolis, MN, USA
- Pediatric Surgical Associates, Minneapolis, MN, USA
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Style CC, Olutoye OO, Belfort MA, Ayres NA, Cruz SM, Lau PE, Shamshirsaz AA, Lee TC, Olutoye OA, Fernandes CJ, Cortes MS, Keswani SG, Espinoza J. Fetal endoscopic tracheal occlusion reduces pulmonary hypertension in severe congenital diaphragmatic hernia. Ultrasound Obstet Gynecol 2019; 54:752-758. [PMID: 30640410 DOI: 10.1002/uog.20216] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 12/19/2018] [Accepted: 01/04/2019] [Indexed: 06/09/2023]
Abstract
OBJECTIVE Fetal endoscopic tracheal occlusion (FETO) is associated with increased perinatal survival and reduced need for extracorporeal membrane oxygenation (ECMO) in fetuses with severe congenital diaphragmatic hernia (CDH). This study evaluates the impact of FETO on the resolution of pulmonary hypertension (PH) in fetuses with isolated CDH. METHODS We reviewed retrospectively the medical records of all fetuses evaluated for CDH between January 2004 and July 2017 at a single institution. Fetuses with additional major structural or chromosomal abnormalities were excluded. CDH cases were classified retrospectively into mild, moderate and severe groups based on prenatal magnetic resonance imaging indices (observed-to-expected total fetal lung volume and percentage of intrathoracic liver herniation). Presence of PH was determined based on postnatal echocardiograms. Logistic regression analyses were performed to evaluate the relationship between FETO and resolution of PH by 1 year of age while controlling for side of the CDH, use of ECMO, gestational age at diagnosis, gestational age at delivery, fetal gender, sildenafil use at discharge and CDH severity. Resolution of PH by 1 year of age was compared between a cohort of fetuses with severe CDH that underwent FETO and a cohort that did not have the procedure (non-FETO). A subanalysis was performed restricting the analysis to isolated left CDH. Parametric and non-parametric tests were used for comparisons. RESULTS Of 257 CDH cases evaluated, 72% (n = 184) had no major structural or chromosomal anomalies of which 58% (n = 107) met the study inclusion criteria. The FETO cohort consisted of 19 CDH cases and the non-FETO cohort (n = 88) consisted of 31 (35%) mild, 32 (36%) moderate and 25 (28%) severe CDH cases. All infants with severe CDH, regardless of whether they underwent FETO, had evidence of neonatal PH. FETO (OR, 3.57; 95% CI, 1.05-12.10; P = 0.041) and ECMO (OR, 5.01; 95% CI, 2.10-11.96; P < 0.001) were independent predictors of resolution of PH by 1 year of age. A higher proportion of infants with severe CDH that underwent FETO had resolution of PH by 1 year after birth compared with infants with severe CDH in the non-FETO cohort (69% (11/16) vs 28% (7/25); P = 0.017). Similar results were observed when the analysis was restricted to cases with left-sided CDH (PH resolution in 69% (11/16) vs 28% (5/18); P = 0.032). CONCLUSION In infants with severe CDH, FETO and ECMO are independently associated with increased resolution of PH by 1 year of age. Copyright © 2019 ISUOG. Published by John Wiley & Sons Ltd.
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Affiliation(s)
- C C Style
- Texas Children's Fetal Center, Baylor College of Medicine, Houston, TX, USA
- The Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA
| | - O O Olutoye
- Texas Children's Fetal Center, Baylor College of Medicine, Houston, TX, USA
- The Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA
| | - M A Belfort
- Texas Children's Fetal Center, Baylor College of Medicine, Houston, TX, USA
- Department of Obstetrics & Gynecology, Division of Maternal-Fetal Medicine, Baylor College of Medicine & Texas Children's Hospital, Houston, TX, USA
| | - N A Ayres
- Texas Children's Fetal Center, Baylor College of Medicine, Houston, TX, USA
- Department of Pediatrics, Cardiology Section, Baylor College of Medicine, Houston, TX, USA
| | - S M Cruz
- Texas Children's Fetal Center, Baylor College of Medicine, Houston, TX, USA
- The Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA
| | - P E Lau
- Texas Children's Fetal Center, Baylor College of Medicine, Houston, TX, USA
- The Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA
| | - A A Shamshirsaz
- Texas Children's Fetal Center, Baylor College of Medicine, Houston, TX, USA
- Department of Obstetrics & Gynecology, Division of Maternal-Fetal Medicine, Baylor College of Medicine & Texas Children's Hospital, Houston, TX, USA
| | - T C Lee
- Texas Children's Fetal Center, Baylor College of Medicine, Houston, TX, USA
- The Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA
| | - O A Olutoye
- Texas Children's Fetal Center, Baylor College of Medicine, Houston, TX, USA
- Department of Anesthesiology, Baylor College of Medicine, Houston, TX, USA
| | - C J Fernandes
- Texas Children's Fetal Center, Baylor College of Medicine, Houston, TX, USA
- Department of Pediatrics, Newborn Section, Baylor College of Medicine, Houston, TX, USA
| | - M Sanz Cortes
- Texas Children's Fetal Center, Baylor College of Medicine, Houston, TX, USA
- Department of Obstetrics & Gynecology, Division of Maternal-Fetal Medicine, Baylor College of Medicine & Texas Children's Hospital, Houston, TX, USA
| | - S G Keswani
- Texas Children's Fetal Center, Baylor College of Medicine, Houston, TX, USA
- The Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA
| | - J Espinoza
- Texas Children's Fetal Center, Baylor College of Medicine, Houston, TX, USA
- Department of Obstetrics & Gynecology, Division of Maternal-Fetal Medicine, Baylor College of Medicine & Texas Children's Hospital, Houston, TX, USA
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Messineo L, Lonni S, Magri R, Pedroni L, Taranto-Montemurro L, Corda L, Tantucci C. Lung air trapping lowers respiratory arousal threshold and contributes to sleep apnea pathogenesis in COPD patients with overlap syndrome. Respir Physiol Neurobiol 2019; 271:103315. [PMID: 31586648 DOI: 10.1016/j.resp.2019.103315] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 09/30/2019] [Accepted: 10/02/2019] [Indexed: 12/31/2022]
Abstract
STUDY OBJECTIVES Overlap syndrome occurs when obstructive sleep apnea (OSA) and chronic obstructive pulmonary disorder (COPD) coexist in the same patient. Although several studies highlighted the importance of clinical phenotyping in OSA, the trait contribution to OSA pathogenesis in overlap syndrome has not been investigated. With this pilot study, we aimed to measure OSA determinants and their relationship with functional respiratory parameters in a sample of patients with overlap syndrome. In particular, we hypothesize that patients with COPD have in the low arousal threshold a major contributor for the development of OSA. METHODS Ten consecutive non-hypercapnic COPD patients (body mass index<35 kg/m2) suffering from overlap syndrome with no other relevant comorbidities underwent a phenotyping polysomnography. Traits were measured with CPAP dial-downs. RESULTS Arousal threshold was found to be inversely associated to functional measures of lung air trapping and static hyperinflation. Particularly, correlations with residual volume (r2 = 0.49, p = 0.024) and residual volume to total lung capacity ratio (r2 = 0.48, p = 0.026) were evident. Only 20% of patients showed a high upper airway passive collapsibility as single pathological trait. In contrast, among those patients with multiple altered traits (6 out of 10), all had an elevated loop gain and 4 (∼65%) a low arousal threshold. CONCLUSIONS High loop gain and particularly low arousal threshold seem important contributors to OSA pathogenesis and severity in patients with COPD. Recognizing in COPD patients these features as key traits may open avenues for personalized medicine in the field of overlap syndrome.
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Affiliation(s)
- Ludovico Messineo
- Respiratory Medicine and Sleep Laboratory, Department of Experimental and Clinical Sciences, University of Brescia and Spedali Civili, Piazzale Spedali Civili 1, 25000, Brescia, Italy; Flinders Medical Center and Flinders University, Adelaide, SA, Australia.
| | - Sara Lonni
- Respiratory Medicine and Sleep Laboratory, Department of Experimental and Clinical Sciences, University of Brescia and Spedali Civili, Piazzale Spedali Civili 1, 25000, Brescia, Italy
| | - Roberto Magri
- Respiratory Medicine and Sleep Laboratory, Department of Experimental and Clinical Sciences, University of Brescia and Spedali Civili, Piazzale Spedali Civili 1, 25000, Brescia, Italy
| | - Leonardo Pedroni
- Respiratory Medicine and Sleep Laboratory, Department of Experimental and Clinical Sciences, University of Brescia and Spedali Civili, Piazzale Spedali Civili 1, 25000, Brescia, Italy
| | - Luigi Taranto-Montemurro
- Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham & Women's Hospital & Harvard Medical School, Boston, MA, United States
| | - Luciano Corda
- Respiratory Medicine and Sleep Laboratory, Department of Experimental and Clinical Sciences, University of Brescia and Spedali Civili, Piazzale Spedali Civili 1, 25000, Brescia, Italy
| | - Claudio Tantucci
- Respiratory Medicine and Sleep Laboratory, Department of Experimental and Clinical Sciences, University of Brescia and Spedali Civili, Piazzale Spedali Civili 1, 25000, Brescia, Italy
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Abstract
In this paper, a method is proposed to measure human respiratory volume using a depth camera. The level-set segmentation method, combined with spatial and temporal information, was used to measure respiratory volume accurately. The shape of the human chest wall was used as spatial information. As temporal information, the segmentation result from the previous frame in the time-aligned depth image was used. The results of the proposed method were verified using a ventilator. The proposed method was also compared with other level-set methods. The result showed that the mean tidal volume error of the proposed method was 8.41% compared to the actual tidal volume. This was calculated to have less error than with two other methods: the level-set method with spatial information (14.34%) and the level-set method with temporal information (10.93%). The difference between these methods of tidal volume error was statistically significant \documentclass[12pt]{minimal}
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}{}${\text{(p}} < {\text{0.0001}})$\end{document}. The intra-class correlation coefficient (ICC) of the respiratory volume waveform measured by a ventilator and by the proposed method was 0.893 on an average, while the ICC between the ventilator and the other methods were 0.837 and 0.879 on an average.
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Lujan HL, DiCarlo SE. Science reflects history as society influences science: brief history of "race," "race correction," and the spirometer. Adv Physiol Educ 2018; 42:163-165. [PMID: 29616572 DOI: 10.1152/advan.00196.2017] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Spirometers are used globally to diagnose respiratory diseases, and most commercially available spirometers "correct" for race. "Race correction" is built into the software of spirometers. To evaluate pulmonary function and to make recordings, the operator must enter the subject's race. In fact, the Joint Working Party of the American Thoracic Society/European Respiratory Society recommends the use of race- and ethnic-specific reference values. In the United States, spirometers apply correction factors of 10-15% for individuals labeled "Black" and 4-6% for people labeled "Asian." Thus race is purported to be a biologically important and scientifically valid category. However, history suggests that race corrections may represent an implicit bias, discrimination, and racism. Furthermore, this practice masks economic and environmental factors. The flawed logic of innate, racial difference is also considered with disability estimates, preemployment physicals, and clinical diagnoses that rely on the spirometer. Thomas Jefferson's Notes on the State of Virginia (1832) may have initiated this mistaken belief by noting deficiencies of the "pulmonary apparatus" of blacks. Plantation physicians used Jefferson's statement to support slavery, believing that forced labor was a way to "vitalize the blood" of deficient black slaves. Samuel Cartwright, a Southern physician and slave holder, was the first to use spirometry to record deficiencies in pulmonary function of blacks. A massive study by Benjamin Apthorp Gould (1869) during the Civil War validated his results. The history of slavery created an environment where racial difference in lung capacity become so widely accepted that race correction became a scientifically valid procedure.
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Affiliation(s)
- Heidi L Lujan
- Department of Physiology, College of Osteopathic Medicine, Michigan State University , East Lansing, Michigan
| | - Stephen E DiCarlo
- Department of Physiology, College of Osteopathic Medicine, Michigan State University , East Lansing, Michigan
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Taher H, Bauer C, Abston E, Kaczka DW, Bhatt SP, Zabner J, Brower RG, Beichel RR, Eberlein M. Chest wall strapping increases expiratory airflow and detectable airway segments in computer tomographic scans of normal and obstructed lungs. J Appl Physiol (1985) 2018; 124:1186-1193. [PMID: 29357485 PMCID: PMC6008079 DOI: 10.1152/japplphysiol.00184.2017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 12/22/2017] [Accepted: 12/28/2017] [Indexed: 11/22/2022] Open
Abstract
Chest wall strapping (CWS) induces breathing at low lung volumes but also increases parenchymal elastic recoil. In this study, we tested the hypothesis that CWS dilates airways via airway-parenchymal interdependence. In 11 subjects (6 healthy and 5 with mild to moderate COPD), pulmonary function tests and lung volumes were obtained in control (baseline) and the CWS state. Control and CWS-CT scans were obtained at 50% of control (baseline) total lung-capacity (TLC). CT lung volumes were analyzed by CT volumetry. If control and CWS-CT volumetry did not differ by more than 25%, airway dimensions were analyzed via automated airway segmentation. CWS-TLC was reduced on average to 71% of control-TLC in normal subjects and 79% of control-TLC in subjects with COPD. CWS increased expiratory airflow at 50% of control-TLC by 41% (3.50 ± 1.6 vs. 4.93 ± 1.9 l/s, P = 0.04) in normals and 316% in COPD(0.25 ± 0.05 vs 0.79 ± 0.39 l/s, P = 0.04). In 10 subjects (5 normals and 5 COPD), control and CWS-CT scans at 50% control-TLC did not differ more than 25% on CT volumetry and were included in the airway structure analysis. CWS increased the mean number of detectable airways with a diameter of ≤2 mm by 32.5% (65 ± 10 vs. 86 ± 124, P = 0.01) in normal subjects and by 79% (59 ± 19 vs. 104 ± 16, P = 0.01) in subjects with COPD. There was no difference in the number of detectable airways with diameters 2-4 mm and >4 mm in normal or in COPD subjects. In conclusion, CWS enhances the detection of small airways via automated CT airway segmentation and increases expiratory airflow in normal subjects as well as in subjects with mild to moderate COPD. NEW & NOTEWORTHY In normal and COPD subjects, chest wall strapping(CWS) increased the number of detectable small airways using automated CT airway segmentation. The concept of dysanapsis expresses the physiological variation in the geometry of the tracheobronchial tree and lung parenchyma based on development. We propose a dynamic concept to dysanapsis in which CWS leads to breathing at lower lung volumes with a corresponding increase in the size of small airways, a potentially novel, nonpharmacological treatment for COPD.
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Affiliation(s)
- Hisham Taher
- Department and Internal Medicine, University of Iowa , Iowa City, Iowa
- Division of Pulmonary, Critical Care and Occupational Medicine, University of Iowa , Iowa City, Iowa
| | - Christian Bauer
- Department of Electrical and Computer Engineering, University of Iowa , Iowa City, Iowa
- Iowa Institute for Biomedical Imaging, University of Iowa , Iowa City, Iowa
| | - Eric Abston
- Department and Internal Medicine, University of Iowa , Iowa City, Iowa
| | - David W Kaczka
- Department of Anesthesiology, University of Iowa , Iowa City, Iowa
- Department of Biomedical Engineering, University of Iowa , Iowa City, Iowa
- Department of Radiology, University of Iowa , Iowa City, Iowa
| | - Surya P Bhatt
- Division of Pulmonary, Allergy, and Critical Care Medicine, University of Alabama , Birmingham, Alabama
| | - Joseph Zabner
- Department and Internal Medicine, University of Iowa , Iowa City, Iowa
- Division of Pulmonary, Critical Care and Occupational Medicine, University of Iowa , Iowa City, Iowa
| | - Roy G Brower
- Division of Pulmonary and Critical Care Medicine, Johns Hopkins University - Baltimore, Maryland
| | - Reinhard R Beichel
- Department and Internal Medicine, University of Iowa , Iowa City, Iowa
- Division of Pulmonary, Critical Care and Occupational Medicine, University of Iowa , Iowa City, Iowa
- Department of Electrical and Computer Engineering, University of Iowa , Iowa City, Iowa
- Iowa Institute for Biomedical Imaging, University of Iowa , Iowa City, Iowa
| | - Michael Eberlein
- Department and Internal Medicine, University of Iowa , Iowa City, Iowa
- Division of Pulmonary, Critical Care and Occupational Medicine, University of Iowa , Iowa City, Iowa
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Núñez V, Romo M, Encinas JL, Bueno A, Herrero B, Antolín E, Parrón M, Martínez L, López Santamaría M. [The role of fetal magnetic resonance imaging in the study of congenital diaphragmatic hernia]. Cir Pediatr 2018; 31:15-20. [PMID: 29419953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
INTRODUCTION AND OBJECTIVES Different echographic and fetal magnetic resonance (MRI) measurements have been described in the diagnosis of associated malformations and the prognosis of congenital diaphragmatic hernia (CDH). We have reviewed our experience searching for useful isolated or combined parameters and how MRI can complement ultrasound. MATERIAL AND METHODS We evaluated 29 fetuses with CDH. We examined ultrasonography: Lung to Head (LHR o/e) and in MRI: ipsilateral lung volume (IPV) and total expressed as percentage of observed / expected lung volume (VPT o/e) and percentage of herniated liver (PHH). We studied: survival, ECMO and associated malformations. RESULTS LHR o/e was the measure that best predicted survival (p< 0.05). VPT o/e did not predict survival or the need of ECMO (p> 0.05). PHH ≥19% was related to the need of ECMO. IPV < 2 cc required ECMO more frequently (p< 0.018) and when it was 0 cc in all cases. No combination of MR measurements was superior to LHR o/e in prediction of survival. MRI complemented the ultrasound in 4 cases: diaphragmatic eventration diagnosed with HDC, right HDC with fluid in the sac that suggested thoracic cyst, differentiation between spleen and lung that measured together overestimated the LHR and/or suspicion of Cornelia de Lange due to facial malformations. CONCLUSIONS Not a single or combined MRI measurement exceeds LHR o/e in survival prediction. MRI is related to prognosis and can be used to support ultrasound in making decisions. MRI occasionally provides complementary morphological information.
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Affiliation(s)
- V Núñez
- Servicio de Cirugía Pediátrica. Hospital Universitario La Paz. Madrid
| | - M Romo
- Servicio de Cirugía Pediátrica. Hospital Universitario La Paz. Madrid
| | - J L Encinas
- Servicio de Cirugía Pediátrica. Hospital Universitario La Paz. Madrid
| | - A Bueno
- Servicio de Cirugía Pediátrica. Hospital Universitario La Paz. Madrid
| | - B Herrero
- Servicio de Obstetricia y Ginecología. Hospital Universitario La Paz. Madrid
| | - E Antolín
- Servicio de Obstetricia y Ginecología. Hospital Universitario La Paz. Madrid
| | - M Parrón
- Servicio de Radiología Pediátrica
| | - L Martínez
- Servicio de Cirugía Pediátrica. Hospital Universitario La Paz. Madrid
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Cavalcante AN, Martin YN, Sprung J, Imsirovic J, Weingarten TN. Low minute ventilation episodes during anesthesia recovery following intraperitoneal surgery as detected by a non-invasive respiratory volume monitor. J Clin Monit Comput 2017; 32:929-935. [PMID: 29260449 DOI: 10.1007/s10877-017-0093-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 12/16/2017] [Indexed: 11/30/2022]
Abstract
An electrical impedance-based noninvasive respiratory volume monitor (RVM) accurately reports minute volume, tidal volume and respiratory rate. Here we used the RVM to quantify the occurrence of and evaluate the ability of clinical factors to predict respiratory depression in the post-anesthesia care unit (PACU). RVM generated respiratory data were collected from spontaneously breathing patients following intraperitoneal surgeries under general anesthesia admitted to the PACU. Respiratory depression was defined as low minute ventilation episode (LMVe, < 40% predicted minute ventilation for at least 2 min). We evaluated for associations between clinical variables including minute ventilation prior to opioid administration and LMVe following the first PACU administration of opioid. Also assessed was a low respiratory rate (< 8 breaths per minute) as a proxy for LMVe. Of 107 patients, 38 (36%) had LMVe. Affected patients had greater intraoperative opioid dose, P = 0.05. PACU opioids were administered to 45 (42.1%) subjects, of which 27 (25.2%) had LMVe (P = 0.42) within 30 min following opioid. Pre-opioid minute ventilation < 70% of predicted normal value was associated with LMVe, P < 0.01, (sensitivity = 100%, specificity = 81%).Low respiratory rate was a poor predictor of LMVe (sensitivity = 11.8%). Other clinical variables (e.g., obstructive sleep apnea) were not found to be predictors of LMVe. Using RVM we identified that mild, clinically nondetectable, respiratory depression prior to opioid administration in the PACU was associated with the development of substantial subsequent respiratory depression during the PACU stay.
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Affiliation(s)
| | - Yvette N Martin
- Department of Anesthesia and Perioperative Medicine, Mayo Clinic, Rochester, MN, USA
| | - Juraj Sprung
- Department of Anesthesia and Perioperative Medicine, Mayo Clinic, Rochester, MN, USA
| | | | - Toby N Weingarten
- Department of Anesthesia and Perioperative Medicine, Mayo Clinic, Rochester, MN, USA.
- Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, 200 First St SW, Rochester, MN, 55905, USA.
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Abstract
Pulmonary morphology, physiology, and respiratory functions change in both physiological and pathological conditions. Internal lung surface area (ISA), representing the gas-exchange capacity of the lung, is a critical criterion to assess respiratory function. However, observer bias can significantly influence measured values for lung morphological parameters. The protocol that we describe here minimizes variations during measurements of two morphological parameters used for ISA calculation: internal lung volume (ILV) and mean linear intercept (MLI). Using ISA as a morphometric and functional parameter to determine the outcome of alveolar regeneration in both pneumonectomy (PNX) and prosthesis implantation mouse models, we found that the increased ISA following PNX treatment was significantly blocked by implantation of a prosthesis into the thoracic cavity1. The ability to accurately quantify ISA is not only expected to improve the reliability and reproducibility of lung function studies in injured-induced alveolar regeneration models, but also to promote mechanistic discoveries of multiple pulmonary diseases.
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Affiliation(s)
- Zhe Liu
- Department of Life Sciences, Peking University; National Institute of Biological Sciences, Beijing
| | - Siling Fu
- National Institute of Biological Sciences, Beijing; Graduate School of Peking Union Medical College
| | - Nan Tang
- National Institute of Biological Sciences, Beijing;
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Dumond R, Gastinger S, Rahman HA, Le Faucheur A, Quinton P, Kang H, Prioux J. Estimation of respiratory volume from thoracoabdominal breathing distances: comparison of two models of machine learning. Eur J Appl Physiol 2017; 117:1533-1555. [PMID: 28612121 DOI: 10.1007/s00421-017-3630-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Accepted: 05/01/2017] [Indexed: 11/25/2022]
Abstract
PURPOSE The purposes of this study were to both improve the accuracy of respiratory volume (V) estimates using the respiratory magnetometer plethysmography (RMP) technique and facilitate the use of this technique. METHOD We compared two models of machine learning (ML) for estimating [Formula: see text]: a linear model (multiple linear regression-MLR) and a nonlinear model (artificial neural network-ANN), and we used cross-validation to validate these models. Fourteen healthy adults, aged [Formula: see text] years participated in the present study. The protocol was conducted in a laboratory test room. The anteroposterior displacements of the rib cage and abdomen, and the axial displacements of the chest wall and spine were measured using two pairs of magnetometers. [Formula: see text] was estimated from these four signals, and the respiratory volume was simultaneously measured using a spirometer ([Formula: see text]) under lying, sitting and standing conditions as well as various exercise conditions (working on computer, treadmill walking at 4 and 6 km[Formula: see text], treadmill running at 9 and 12 km [Formula: see text] and ergometer cycling at 90 and 110 W). RESULTS The results from the ANN model fitted the spirometer volume significantly better than those obtained through MLR. Considering all activities, the difference between [Formula: see text] and [Formula: see text] (bias) was higher for the MLR model ([Formula: see text] L) than for the ANN model ([Formula: see text] L). CONCLUSION Our results demonstrate that this new processing approach for RMP seems to be a valid tool for estimating V with sufficient accuracy during lying, sitting and standing and under various exercise conditions.
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Affiliation(s)
- Rémy Dumond
- Laboratoire Mouvement, Sport, Santé (EA 1274), Université de Rennes 2, Avenue Robert Schuman, 35170, Bruz, France.
- Département Sciences du sport et éducation physique, Ecole normale supérieure de Rennes, Campus de Ker Lann, Avenue Robert Schuman, 35170, Bruz, France.
| | - Steven Gastinger
- Laboratoire Mouvement, Sport, Santé (EA 1274), Université de Rennes 2, Avenue Robert Schuman, 35170, Bruz, France
- APCoSS, Institut de Formation en Éducation Physique et en Sport d'Angers (IFEPSA), Les Ponts de Cé, France
| | - Hala Abdul Rahman
- Laboratoire Mouvement, Sport, Santé (EA 1274), Université de Rennes 2, Avenue Robert Schuman, 35170, Bruz, France
- Laboratoire du Traitement du Signal et de l'Image, Université de Rennes 1, Campus de Beaulieu, Bâtiment 22, Rennes, 35042 Cedex, France
| | - Alexis Le Faucheur
- Laboratoire Mouvement, Sport, Santé (EA 1274), Université de Rennes 2, Avenue Robert Schuman, 35170, Bruz, France
- Département Sciences du sport et éducation physique, Ecole normale supérieure de Rennes, Campus de Ker Lann, Avenue Robert Schuman, 35170, Bruz, France
| | - Patrice Quinton
- Laboratoire Mouvement, Sport, Santé (EA 1274), Université de Rennes 2, Avenue Robert Schuman, 35170, Bruz, France
- Departement Informatique et télécommunications, Ecole normale supérieure de Rennes, Campus de Ker Lann, Avenue Robert Schuman, 35170, Bruz, France
| | - Haitao Kang
- Yuewu Electronic Technology Co., Ltd, Room 1008, Building B, No. 2305, Zuchongzhi Road, Shanghai, 201203, China
| | - Jacques Prioux
- Laboratoire Mouvement, Sport, Santé (EA 1274), Université de Rennes 2, Avenue Robert Schuman, 35170, Bruz, France.
- Département Sciences du sport et éducation physique, Ecole normale supérieure de Rennes, Campus de Ker Lann, Avenue Robert Schuman, 35170, Bruz, France.
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Bosch B, Bilton D, Sosnay P, Raraigh KS, Mak DYF, Ishiguro H, Gulmans V, Thomas M, Cuppens H, Amaral M, De Boeck K. Ethnicity impacts the cystic fibrosis diagnosis: A note of caution. J Cyst Fibros 2017; 16:488-491. [PMID: 28233695 DOI: 10.1016/j.jcf.2017.01.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Revised: 01/27/2017] [Accepted: 01/28/2017] [Indexed: 11/19/2022]
Abstract
BACKGROUND The diagnosis of Cystic Fibrosis (CF) is by consensus based on the same parameters in all patients, yet the influence of ethnicity has only scarcely been studied. We aimed at elucidating the impact of Asian descent on the diagnosis of CF. METHODS We performed a retrospective analysis of the CFTR2 and UK CF databases for clinical phenotype, sweat chloride values and CFTR mutations and compared the diagnostic characteristics of Asian to non-Asian patients with CF. RESULTS Asian patients with CF do not have a worse clinical phenotype. The repeatedly reported lower FEV1 of Asian patients with CF is attributable to the influence of ethnicity on lung function in general. However, pancreatic sufficiency is more common in Asian patients with CF. The diagnosis of CF in people with Asian ancestry is heterogeneous as mean sweat chloride values are lower (92±26 versus 99±22mmol/L in controls) and 14% have sweat chloride values below 60mmol/L (versus 6% in non-Asians). Also, CFTR mutations differ from those in Caucasians: 55% of British Asian patients with CF do not have one mutation included in the routine newborn screening panel. CONCLUSIONS Bringing together the largest cohort of patients with CF and Asian ethnicity, we demonstrate that Asian roots impact on all three CF diagnostic pillars. These findings have implications for clinical practice in the increasingly ethnically diverse Western population.
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Affiliation(s)
- Barbara Bosch
- Pediatric Pulmonology, University Hospitals Leuven, Leuven, Belgium; Organ Systems, KU Leuven, Leuven, Belgium.
| | - Diana Bilton
- NIHR Specialist Respiratory Biomedical Research Unit, Royal Brompton and Harefield NHS Foundation Trust and Imperial College, London, UK
| | - Patrick Sosnay
- Pulmonary & Critical Care Medicine, Johns Hopkins University, Baltimore, USA; McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University, Baltimore, USA
| | - Karen S Raraigh
- McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University, Baltimore, USA
| | | | - Hiroshi Ishiguro
- Human Nutrition, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Vincent Gulmans
- Research Department, Dutch Cystic Fibrosis Foundation, Baarn, The Netherlands
| | - Muriel Thomas
- Belgium Cystic Fibrosis Registry (BMR-RBM), Scientific Institute of Public Health (WIV-ISP), Brussels, Belgium
| | - Harry Cuppens
- Pediatric Pulmonology, University Hospitals Leuven, Leuven, Belgium
| | - Margarida Amaral
- University of Lisboa, Faculty of Sciences, BioISI - Biosystems & Integrative Sciences Institute, Lisboa, Portugal
| | - Kris De Boeck
- Pediatric Pulmonology, University Hospitals Leuven, Leuven, Belgium
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Abstract
There is a need for efficient techniques to assess abnormalities in the peripheral regions of the lungs, for example, for diagnosis of pulmonary emphysema. Considerable scientific efforts have been directed toward measuring lung morphology by studying recovery of inhaled micron-sized aerosol particles (0.4-1.5 µm). In contrast, it is suggested that the recovery of inhaled airborne nanoparticles may be more useful for diagnosis. The objective of this work is to provide a theoretical background for the use of nanoparticles in measuring lung morphology and to assess their applicability based on a review of the literature. Using nanoparticles for studying distal airspace dimensions is shown to have several advantages over other aerosol-based methods. 1) Nanoparticles deposit almost exclusively by diffusion, which allows a simpler breathing maneuver with minor artifacts from particle losses in the oropharyngeal and upper airways. 2) A higher breathing flow rate can be utilized, making it possible to rapidly inhale from residual volume to total lung capacity (TLC), thereby eliminating the need to determine the TLC before measurement. 3) Recent studies indicate better penetration of nanoparticles than micron-sized particles into poorly ventilated and diseased regions of the lungs; thus, a stronger signal from the abnormal parts is expected. 4) Changes in airspace dimensions have a larger impact on the recovery of nanoparticles. Compared to current diagnostic techniques with high specificity for morphometric changes of the lungs, computed tomography and magnetic resonance imaging with hyperpolarized gases, an aerosol-based method is likely to be less time consuming, considerably cheaper, simpler to use, and easier to interpret (providing a single value rather than an image that has to be analyzed). Compared to diagnosis by carbon monoxide (DL,CO), the uptake of nanoparticles in the lung is not affected by blood flow, hemoglobin concentration or alterations of the alveolar membranes, but relies only on lung morphology.
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Affiliation(s)
- Jakob Löndahl
- Division of Ergonomics and Aerosol Technology (EAT), Department of Design Sciences
- NanoLund, Lund University, Lund, Sweden
| | - Jonas KF Jakobsson
- Division of Ergonomics and Aerosol Technology (EAT), Department of Design Sciences
- NanoLund, Lund University, Lund, Sweden
| | - David M Broday
- Faculty of Civil and Environmental Engineering, Technion, Haifa, Israel
| | - H Laura Aaltonen
- Department of Translational Medicine, Lund University, Malmö, Sweden
| | - Per Wollmer
- Department of Translational Medicine, Lund University, Malmö, Sweden
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Massaroni C, Cassetta E, Levai IK, Winter S, Dickinson JW, Silvestri S. Optical measurement of breathing: algorithm volume calibration and preliminary validation on healthy trained subjects. Annu Int Conf IEEE Eng Med Biol Soc 2016; 2016:2153-2156. [PMID: 28268758 DOI: 10.1109/embc.2016.7591155] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The use of optical technologies may be beneficial when measuring breathing biomechanics. The purpose of this study was twofold: i) to enhance the optoelectronic plethysmography (OEP) algorithm performance for the volume estimation by the use of a novel volume calibration procedure and ii) to compare the OEP volumes gained by a commercial optoelectronic system against actual respiratory volumes measured by a breath-by-breath gas analyzer (BbB). The OEP volume algorithm calibration was performed by the use of a novel volume calibration procedure based on both a calibrator device that delivered known volumes changes and one ad-hoc designed software for the static and dynamic calibration analysis. OEP algorithm threshold, accuracy, repeatability and the volume algorithm calibration were investigated. Tidal volume (VT) measurements performed simultaneously by the calibrated OEP algorithm and BbB analyzer were compared. VT measured simultaneously by OEP and BbB was collected during submaximal exercise tests in five trained healthy participants in two conditions (with hunched shoulders and in normal shoulder position). The two methods were compared by linear regression and Bland-Altman analysis in both positions. The average difference between methods and the discrepancy were calculated. The OEP-BbB correlation was high in both positions, R2=0.92 and R2=0.97 for hunch and normal one, respectively. Bland-Altman analysis demonstrated that OEP algorithm systematic difference was lower than 100mL. The limits of agreement assessed in both positions are comparable. The difference between measurements suggesting that OEP may be a useful tool to analyze chest wall volume changes and breathing mechanics during intense exercise.
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Jensen R, Stanojevic S, Klingel M, Pizarro ME, Hall GL, Ramsey K, Foong R, Saunders C, Robinson PD, Webster H, Hardaker K, Kane M, Ratjen F. A Systematic Approach to Multiple Breath Nitrogen Washout Test Quality. PLoS One 2016; 11:e0157523. [PMID: 27304432 PMCID: PMC4909265 DOI: 10.1371/journal.pone.0157523] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Accepted: 06/01/2016] [Indexed: 11/18/2022] Open
Abstract
Background Accurate estimates of multiple breath washout (MBW) outcomes require correct operation of the device, appropriate distraction of the subject to ensure they breathe in a manner representative of their relaxed tidal breathing pattern, and appropriate interpretation of the acquired data. Based on available recommendations for an acceptable MBW test, we aimed to develop a protocol to systematically evaluate MBW measurements based on these criteria. Methods 50 MBW test occasions were systematically reviewed for technical elements and whether the breathing pattern was representative of relaxed tidal breathing by an experienced MBW operator. The impact of qualitative and quantitative criteria on inter-observer agreement was assessed across eight MBW operators (n = 20 test occasions, compared using a Kappa statistic). Results Using qualitative criteria, 46/168 trials were rejected: 16.6% were technically unacceptable and 10.7% were excluded due to inappropriate breathing pattern. Reviewer agreement was good using qualitative criteria and further improved with quantitative criteria from (κ = 0.53–0.83%) to (κ 0.73–0.97%), but at the cost of exclusion of further test occasions in this retrospective data analysis. Conclusions The application of the systematic review improved inter-observer agreement but did not affect reported MBW outcomes.
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Affiliation(s)
- Renee Jensen
- Division of Respiratory Medicine, Hospital for Sick Children, Toronto, Canada
| | - Sanja Stanojevic
- Division of Respiratory Medicine, Hospital for Sick Children, Toronto, Canada
- University of Toronto, Toronto, Canada
- * E-mail:
| | - Michelle Klingel
- Division of Respiratory Medicine, Hospital for Sick Children, Toronto, Canada
| | - Maria Ester Pizarro
- Division of Respiratory Medicine, Hospital for Sick Children, Toronto, Canada
- Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Graham L. Hall
- Telethon Kids Institute, Perth, Australia
- Centre for Child Health Research, University of Western Australia, Perth, Australia
- School of Physiotherapy and Exercise Science, Curtin University, Perth, Australia
| | - Kathryn Ramsey
- Telethon Kids Institute, Perth, Australia
- Centre for Child Health Research, University of Western Australia, Perth, Australia
- University of North Carolina at Chapel Hill, Chapel Hill, United States of America
| | - Rachel Foong
- Telethon Kids Institute, Perth, Australia
- Centre for Child Health Research, University of Western Australia, Perth, Australia
| | - Clare Saunders
- Royal Brompton & Harefield NHS Foundation Trust, London, United Kingdom
- Department of Gene Therapy, Imperial College London, London, United Kingdom
| | - Paul D. Robinson
- Department of Respiratory Medicine, The Children’s Hospital at Westmead, Sydney, Australia
- Discipline of Paediatrics and Child Health, University of Sydney, Sydney, Australia
| | - Hailey Webster
- Division of Respiratory Medicine, Hospital for Sick Children, Toronto, Canada
| | - Kate Hardaker
- Department of Respiratory Medicine, The Children’s Hospital at Westmead, Sydney, Australia
| | - Mica Kane
- Division of Respiratory Medicine, Hospital for Sick Children, Toronto, Canada
| | - Felix Ratjen
- Division of Respiratory Medicine, Hospital for Sick Children, Toronto, Canada
- University of Toronto, Toronto, Canada
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Rizzi M, Atzeni F, Airoldi A, Masala IF, Frassanito F, Salaffi F, Macaluso C, Sarzi-Puttini P. Impaired lung transfer factor in fibromyalgia syndrome. Clin Exp Rheumatol 2016; 34:S114-S119. [PMID: 27157396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 02/08/2016] [Indexed: 06/05/2023]
Abstract
OBJECTIVES The aim of this study was to evaluate whether pulmonary diffusing capacity is impaired in patients with fibromyalgia (FM) as it is in those with other diseases characterised by autonomic nerve system (ANS) dysfunction such as type 1 diabetes. METHODS Forty-five consecutive anti-nuclear antibody (ANA)-negative female Caucasian patients aged 50.1± 5.6 years with FM and compared with 45 healthy female control volunteers matched in terms of age and body mass index (BMI). The autonomic function has been evaluated by means of standard electrocardiography (ECG), finger blood pressure respiration, and muscle sympathetic nerve activity (MSNA) at rest and during a stepwise tilt test up to 75°. Their autonomic profiles were drawn up on the basis of MSNA, plasma catecholamine levels, and spectral indices of cardiac sympathetic and vagal modulation, and sympathetic vasomotor control computed by means of the spectrum analysis of RR and systolic arterial pressure (SAP) variability. Lung volumes and dynamic spirometry parameters were assessed by means of plethysmography. All of the patients were clinically evaluated and completed the FQI and COMPASS questionnaire. RESULTS There was no difference in lung volumes between the FM patients and healthy controls, but DLCO (83±4 vs. 96±5; p<0.001), Kco (84±5 vs 98±5; p<0.001), DM (12.7±2.4 vs 13.6±1.8; p<0.05) and Vc (48±3.9 vs 65±7; p<0.001) were significantly reduced in the patients. The COMPASS-31, RCS and pain VAS scores significantly correlated with DLCO, Kco and Vc with the correlation being particularly close in the case of Vc. Furthermore, univariate Cox proportional hazard analysis showed that the three scores were all significantly associated with an increased risk of impaired DLCO (respectively, χ(2) 16.21, p<0.0005; χ(2) 7.09, p<0.005; χ(2) 6.37, p<0.01). CONCLUSIONS FM impairs DLCO mainly as a result of a reduction in Vc, and that this defect is inversely proportional to the severity of the dysfunction suggesting a relationship between impaired DLCO and autonomic nerve dysfunction.
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Affiliation(s)
- Maurizio Rizzi
- Pulmonary Department, University Hospital L. Sacco, Milan, Italy.
| | | | - Andrea Airoldi
- Pulmonary Department, University Hospital L. Sacco, Milan, Italy
| | | | | | - Fausto Salaffi
- Department of Rheumatology, University of Ancona, Jesi, Italy
| | - Claudio Macaluso
- Pulmonary Department, University Hospital L. Sacco, Milan, Italy
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Josipovic M, Persson GF, Dueck J, Bangsgaard JP, Westman G, Specht L, Aznar MC. Geometric uncertainties in voluntary deep inspiration breath hold radiotherapy for locally advanced lung cancer. Radiother Oncol 2016; 118:510-4. [PMID: 26631647 DOI: 10.1016/j.radonc.2015.11.004] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Revised: 11/03/2015] [Accepted: 11/08/2015] [Indexed: 12/16/2022]
Abstract
BACKGROUND AND PURPOSE Deep inspiration breath hold (DIBH) increases lung volume and can potentially reduce treatment-related toxicity in locally advanced lung cancer. We estimated geometric uncertainties in visually guided voluntary DIBH and derived the appropriate treatment margins for different image-guidance strategies. MATERIAL AND METHODS Seventeen patients were included prospectively. An optical marker-based respiratory monitoring with visual guidance enabled comfortable DIBHs, adjusted to each patient's performance. All patients had three consecutive DIBH CTs at each of the treatment fractions 2, 16 and 31. DIBH reproducibility was evaluated as inter- and intra-fractional variations in lung volume, tumour position and differential motion between primary tumour and mediastinal lymph nodes. RESULTS Lung volume increased by median 60% in DIBH. Inter- and intra-fractional lung volume variations were median 2.1% and 1.1%, respectively. Inter- and intra-fractional uncertainties in 3D tumour position were 4.8 ± 2.8 mm and 1.7 ± 1.4 mm (mean ± SD). Inter- and intra-fractional differential motion was 4.8 ± 3.3 mm and 0.0 ± 1.1 mm. CONCLUSIONS For single targets, visually guided voluntary DIBH radiotherapy is highly reproducible provided an image-guidance strategy with tumour registration is performed. If the primary tumour is separated from the mediastinal lymph nodes, inter-fractional differential motion remains a challenge and margins must be adapted to reflect the image registration strategy.
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Affiliation(s)
- Mirjana Josipovic
- Department of Oncology, Section of Radiotherapy, Rigshospitalet, Copenhagen, Denmark; Niels Bohr Institute, Faculty of Science, University of Copenhagen, Denmark.
| | - Gitte F Persson
- Department of Oncology, Section of Radiotherapy, Rigshospitalet, Copenhagen, Denmark
| | - Jenny Dueck
- Department of Oncology, Section of Radiotherapy, Rigshospitalet, Copenhagen, Denmark; Niels Bohr Institute, Faculty of Science, University of Copenhagen, Denmark; Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Jens Peter Bangsgaard
- Department of Oncology, Section of Radiotherapy, Rigshospitalet, Copenhagen, Denmark
| | - Gunnar Westman
- Department of Oncology, Section of Radiotherapy, Rigshospitalet, Copenhagen, Denmark
| | - Lena Specht
- Department of Oncology, Section of Radiotherapy, Rigshospitalet, Copenhagen, Denmark; Faculty of Medical Sciences, University of Copenhagen, Denmark
| | - Marianne C Aznar
- Department of Oncology, Section of Radiotherapy, Rigshospitalet, Copenhagen, Denmark; Niels Bohr Institute, Faculty of Science, University of Copenhagen, Denmark; Faculty of Medical Sciences, University of Copenhagen, Denmark
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Wada S, Imai T, Min K, Ogo K, Miyamoto T, Okada Y, Fujioka S. [A New Method of Analyzing the Closing Volume (CV) Curve: "N2 First Derivative Wave Method"]. Rinsho Byori 2015; 63:1264-1270. [PMID: 26995871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Evaluation of the lung function involves the measurement of many factors. The closing volume (CV) curve is clinically important as an index of uneven alveolar ventilation and airway closure. Although conventional methods for CV measurement are usually based on the pattern of the exhaled nitrogen (N2) concentration curve with respect to the lung volume, it is often difficult to measure the steep pattern of patients with chronic obstructive pulmonary disease (COPD). In this paper, we proposed a new method called the "N2 first derivative (fdN) wave method" for measuring CV. The N2 concentration of the CV curve was transformed to a derivative with respect to the lung volume, which revealed the existence of cardiogenic oscillations. Discrimination between phases III and IV was straightforward based on the difference in the slope or in the amplitude of oscillations of the fdN wave. Our new method was able to distinguish phase IV from phase III using the difference in amplitude of the oscillation of the fdN wave even in the presence of COPD with steep patterns of the CV curve. Close relationships were seen among normal subjects including COPD patients in both the slope of the alveolar plateau (ΔN2) and the CV values measured with the conventional and new methods. In conclusion, the new method we propose in this paper was able to provide measurements of CV for all subjects including those with COPD. [Original]
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Park CH, Kim TH, Lee S, Paik HC, Haam SJ. New predictive equation for lung volume using chest computed tomography for size matching in lung transplantation. Transplant Proc 2015; 47:498-503. [PMID: 25769597 DOI: 10.1016/j.transproceed.2014.12.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Accepted: 12/30/2014] [Indexed: 11/19/2022]
Abstract
PURPOSE Lung size matching is important in lung transplantation (LT). With advances in computed tomography (CT) technology, multidetector row CT can accurately measure the thoracic cage and lung volumes. The objective of this study was to generate a new regression equation using demographic data based on the measured CT lung volume in a healthy population to predict the CT lung volume of the donor in LT size matching. MATERIALS AND METHODS The medical records of healthy subjects who underwent chest CT scans to screen for lung cancer were retrospectively reviewed. CT lung volume was semi-automatically measured using a threshold-based auto-segmentation technique. New regression equations for CT lung volume were generated by multiple linear regression analysis using demographic data including height (H, cm), weight (W, kg), and age (A, years). The percentage error rate (%) of the equations were calculated as ([Estimated CT lung volume--Measured CT lung volume]/Measured CT lung volume × 100). A percentage error rate within ± 20% was considered acceptable. RESULTS A total of 141 men aged 27 to 55 years (mean, 46.7 ± 6.2 years) and 128 women aged 20 to 55 years (mean, 45.4 ± 7.2 years) were enrolled. The final regression equations for CT lung volume were (-5.890 + 0.067 H - 0.030 W + 0.020 A) in men and (-6.698 + 0.072 H - 0.024 W) in women. The mean absolute error rate was 10.9 ± 9.0% and 11.0 ± 8.5% in men and women, respectively. Percentage error rates were within ± 20% in 121 of 141 (85.8%) men and 113 of 128 (88.3%) women. CONCLUSION These equations could predict the CT lung volume of healthy subjects using demographic data. Using these equations, the predicted CT lung volume of donors could be matched to the measured CT lung volume of recipients in lung transplantation.
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Affiliation(s)
- C H Park
- Department of Radiology and the Research Institute of Radiological Science, Yonsei University Health System, Seoul, Republic of Korea
| | - T H Kim
- Department of Radiology and the Research Institute of Radiological Science, Yonsei University Health System, Seoul, Republic of Korea
| | - S Lee
- Department of Thoracic and Cardiovascular Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - H C Paik
- Department of Thoracic and Cardiovascular Surgery, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - S J Haam
- Department of Thoracic and Cardiovascular Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea.
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Davey C, Zoumot Z, Jordan S, McNulty WH, Carr DH, Hind MD, Hansell DM, Rubens MB, Banya W, Polkey MI, Shah PL, Hopkinson NS. Bronchoscopic lung volume reduction with endobronchial valves for patients with heterogeneous emphysema and intact interlobar fissures (the BeLieVeR-HIFi study): a randomised controlled trial. Lancet 2015; 386:1066-73. [PMID: 26116485 DOI: 10.1016/s0140-6736(15)60001-0] [Citation(s) in RCA: 237] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Lung volume reduction surgery improves survival in selected patients with emphysema, and has generated interest in bronchoscopic approaches that might achieve the same effect with less morbidity and mortality. Previous trials with endobronchial valves have yielded modest group benefits because when collateral ventilation is present it prevents lobar atelectasis. METHODS We did a single-centre, double-blind sham-controlled trial in patients with both heterogeneous emphysema and a target lobe with intact interlobar fissures on CT of the thorax. We enrolled stable outpatients with chronic obstructive pulmonary disease who had a forced expiratory volume in 1 s (FEV1) of less than 50% predicted, significant hyperinflation (total lung capacity >100% and residual volume >150%), a restricted exercise capacity (6 min walking distance <450 m), and substantial breathlessness (MRC dyspnoea score ≥3). Participants were randomised (1:1) by computer-generated sequence to receive either valves placed to achieve unilateral lobar occlusion (bronchoscopic lung volume reduction) or a bronchoscopy with sham valve placement (control). Patients and researchers were masked to treatment allocation. The study was powered to detect a 15% improvement in the primary endpoint, the FEV1 3 months after the procedure. Analysis was on an intention-to-treat basis. The trial is registered at controlled-trials.com, ISRCTN04761234. FINDINGS 50 patients (62% male, FEV1 [% predicted] mean 31·7% [SD 10·2]) were enrolled to receive valves (n=25) or sham valve placement (control, n=25) between March 1, 2012, and Sept 30, 2013. In the bronchoscopic lung volume reduction group, FEV1 increased by a median 8·77% (IQR 2·27-35·85) versus 2·88% (0-8·51) in the control group (Mann-Whitney p=0·0326). There were two deaths in the bronchoscopic lung volume reduction group and one control patient was unable to attend for follow-up assessment because of a prolonged pneumothorax. INTERPRETATION Unilateral lobar occlusion with endobronchial valves in patients with heterogeneous emphysema and intact interlobar fissures produces significant improvements in lung function. There is a risk of significant complications and further trials are needed that compare valve placement with lung volume reduction surgery. FUNDING Efficacy and Mechanism Evaluation Programme, funded by the Medical Research Council (MRC) and managed by the National Institute for Health Research (NIHR) on behalf of the MRC-NIHR partnership.
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Affiliation(s)
- Claire Davey
- NIHR Respiratory Disease, Biomedical Research Unit at the Royal Brompton and Harefield NHS Foundation Trust, and Imperial College London, London, UK
| | - Zaid Zoumot
- NIHR Respiratory Disease, Biomedical Research Unit at the Royal Brompton and Harefield NHS Foundation Trust, and Imperial College London, London, UK
| | - Simon Jordan
- NIHR Respiratory Disease, Biomedical Research Unit at the Royal Brompton and Harefield NHS Foundation Trust, and Imperial College London, London, UK
| | - William H McNulty
- NIHR Respiratory Disease, Biomedical Research Unit at the Royal Brompton and Harefield NHS Foundation Trust, and Imperial College London, London, UK
| | - Dennis H Carr
- NIHR Respiratory Disease, Biomedical Research Unit at the Royal Brompton and Harefield NHS Foundation Trust, and Imperial College London, London, UK
| | - Matthew D Hind
- NIHR Respiratory Disease, Biomedical Research Unit at the Royal Brompton and Harefield NHS Foundation Trust, and Imperial College London, London, UK
| | - David M Hansell
- NIHR Respiratory Disease, Biomedical Research Unit at the Royal Brompton and Harefield NHS Foundation Trust, and Imperial College London, London, UK
| | - Michael B Rubens
- NIHR Respiratory Disease, Biomedical Research Unit at the Royal Brompton and Harefield NHS Foundation Trust, and Imperial College London, London, UK
| | - Winston Banya
- NIHR Respiratory Disease, Biomedical Research Unit at the Royal Brompton and Harefield NHS Foundation Trust, and Imperial College London, London, UK
| | - Michael I Polkey
- NIHR Respiratory Disease, Biomedical Research Unit at the Royal Brompton and Harefield NHS Foundation Trust, and Imperial College London, London, UK
| | - Pallav L Shah
- NIHR Respiratory Disease, Biomedical Research Unit at the Royal Brompton and Harefield NHS Foundation Trust, and Imperial College London, London, UK
| | - Nicholas S Hopkinson
- NIHR Respiratory Disease, Biomedical Research Unit at the Royal Brompton and Harefield NHS Foundation Trust, and Imperial College London, London, UK.
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Petrović M, Petrović J, Simić G, Ilić I, Danicić A, Vukcević M, Bojović B, Hadzievski L, Allsop T, Webb DJ. A new method for respiratory-volume monitoring based on long-period fibre gratings. Annu Int Conf IEEE Eng Med Biol Soc 2015; 2013:2660-3. [PMID: 24110274 DOI: 10.1109/embc.2013.6610087] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Respiratory-volume monitoring is an indispensable part of mechanical ventilation. Here we present a new method of the respiratory-volume measurement based on a single fibre-optical long-period sensor of bending and the correlation between torso curvature and lung volume. Unlike the commonly used air-flow based measurement methods the proposed sensor is drift-free and immune to air-leaks. In the paper, we explain the working principle of sensors, a two-step calibration-test measurement procedure and present results that establish a linear correlation between the change in the local thorax curvature and the change of the lung volume. We also discuss the advantages and limitations of these sensors with respect to the current standards.
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Sircar S. A simple device for measuring static compliance of lung-thorax combine. Adv Physiol Educ 2015; 39:187-188. [PMID: 26330035 DOI: 10.1152/advan.00026.2014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Explaining the concept of lung compliance remains a challenge to the physiology teacher because it cannot be demonstrated easily in human subjects and all attempts until now have used only simulation models. A simple device is described in the present article to measure the compliance of the "lung-thorax" combine in human subjects with the caveat that what is recorded is not "lung" compliance and the data generated are of little clinical use. The device comprises a spirometer, a manometer, a mouthpiece, and interconnecting tubes guarded with stopcocks.
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Affiliation(s)
- Sabyasachi Sircar
- Department of Physiology, All India Institute of Medical Sciences, Jodhpur, India
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Adachi D, Yamada M, Nishiguchi S, Fukutani N, Hotta T, Tashiro Y, Morino S, Shirooka H, Nozaki Y, Hirata H, Yamaguchi M, Aoyama T. Age-related decline in chest wall mobility: a cross-sectional study among community-dwelling elderly women. J Osteopath Med 2015; 115:384-9. [PMID: 26024332 DOI: 10.7556/jaoa.2015.079] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
CONTEXT Chest wall mobility is strongly related to respiratory function; however, the effect of aging on chest wall mobility-and the level at which this mobility is most affected-remains unclear. OBJECTIVE To investigate age-related differences in chest wall mobility and respiratory function among elderly women in different age groups. METHODS This cross-sectional observational study was performed in Himeji City in Hyogo Prefecture and Ayabe City in Kyoto Prefecture in Japan. Inclusion criteria were female sex, age 65 years or older, community resident, and ability to ambulate independently, with or without an assistive device. Thoracic excursion at the axillary and xiphoid levels and at the level of the tenth rib was measured with measuring tape. Respiratory function, including forced vital capacity (FVC) and forced expiratory volume in 1 second (FEV1), was assessed by spirometry, and FVC percent predicted (%FVC), FEV1 percent predicted (%FEV1), and FEV1/FVC were calculated. Chest wall mobility and respiratory function were compared among 4 age groups. RESULTS Of 251 potential participants, 132 met the inclusion criteria. Participants were divided into 4 age groups: group 1, 65 to 69 years; group 2, 70 to 74 years; group 3, 75 to 79 years; and group 4, 80 years or older. Statistically significant differences were found in thoracic excursion at the axillary level between groups 1 and 4 and between groups 2 and 4 when adjusted for height and weight (F4.52, P=.01). In addition, statistically significant differences were found in the FVC and FEV1 values between groups 1 and 3 and between groups 2 and 3 (FVC: F4.97, P=.01; FEV1: F6.17, P=.01). CONCLUSION Chest wall mobility at the axillary level and respiratory function decreased with age in community-dwelling women aged 65 years or older. Further longitudinal studies are required to clarify the effects of aging on chest wall mobility and respiratory function.
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Spaggiari E, Stirnemann JJ, Sonigo P, Khen-Dunlop N, De Saint Blanquat L, Ville Y. Prenatal prediction of pulmonary arterial hypertension in congenital diaphragmatic hernia. Ultrasound Obstet Gynecol 2015; 45:572-577. [PMID: 24976012 DOI: 10.1002/uog.13450] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 06/12/2014] [Accepted: 06/19/2014] [Indexed: 06/03/2023]
Abstract
OBJECTIVE To evaluate the role of prenatal prognostic markers obtained routinely by ultrasound examination and magnetic resonance imaging (MRI) in the prediction of development of postnatal pulmonary arterial hypertension (PAH) in isolated congenital diaphragmatic hernia (CDH). METHODS One hundred and ten cases of isolated CDH were referred to our fetal medicine unit between January 2004 and April 2013. Mortality and morbidity rates were reviewed for those presenting with postnatal PAH. The following prenatal markers were evaluated as potential predictive factors of PAH: liver position, side of the CDH defect, lung area to head circumference ratio (LHR) and observed/expected LHR (o/e-LHR), which were measured by ultrasound, and observed/expected total fetal lung volume (o/e-TFLV), which was measured by MRI. Univariable logistic regression was used to assess associations. RESULTS PAH was significantly associated with perinatal mortality and morbidity (P < 0.001). The occurrence of PAH decreased significantly with an increasing LHR, o/e-LHR and o/e-TFLV and was significantly increased for cases with an intrathoracic liver, but not for those with right-sided defects. Univariable regression revealed that o/e-TFLV (odds ratio (OR), 0.9 (95% CI, 0.86-0.95); P < 0.05 for percentage unit change in o/e), LHR (OR, 0.19 (95% CI, 0.09-0.40); P < 0.05 for unit change), o/e-LHR (OR, 0.95 (95% CI, 0.93-0.98); P < 0.05 for percentage unit change in o/e) and liver position (OR, 2.82 (95% CI, 1.13-7.00); P < 0.05 for intrathoracic liver) were significant predictors of subsequent PAH. No differences were found after adjusting for gestational age at delivery. The areas under the receiver-operating characteristics curve were 0.80 and 0.75 for o/e-TFLV and o/e-LHR, respectively. CONCLUSION In cases of CDH, PAH is associated with high rates of mortality and morbidity. Routinely obtained prenatal markers, usually used for the assessment of pulmonary hypoplasia, are also relevant for the postnatal prediction of PAH.
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MESH Headings
- Female
- Gestational Age
- Head
- Hernias, Diaphragmatic, Congenital/diagnosis
- Hernias, Diaphragmatic, Congenital/embryology
- Hernias, Diaphragmatic, Congenital/pathology
- Humans
- Hypertension, Pulmonary/diagnosis
- Hypertension, Pulmonary/embryology
- Hypertension, Pulmonary/pathology
- Infant, Newborn
- Liver/embryology
- Liver/pathology
- Lung/embryology
- Lung/pathology
- Lung Volume Measurements/methods
- Predictive Value of Tests
- Pregnancy
- Prognosis
- Survival Rate
- Ultrasonography, Prenatal
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Affiliation(s)
- E Spaggiari
- Department of Obstetrics and Maternal-Fetal Medicine, Necker-Enfants Malades Hospital, AP-HP, Paris, France; University Paris Descartes, Sorbonne Paris-Cité, Paris, France
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