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Ostras O, Shponka I, Pinton G. Ultrasound imaging of lung disease and its relationship to histopathology: An experimentally validated simulation approach. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2023; 154:2410-2425. [PMID: 37850835 PMCID: PMC10586875 DOI: 10.1121/10.0021870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 09/23/2023] [Accepted: 09/26/2023] [Indexed: 10/19/2023]
Abstract
Lung ultrasound (LUS) is a widely used technique in clinical lung assessment, yet the relationship between LUS images and the underlying disease remains poorly understood due in part to the complexity of the wave propagation physics in complex tissue/air structures. Establishing a clear link between visual patterns in ultrasound images and underlying lung anatomy could improve the diagnostic accuracy and clinical deployment of LUS. Reverberation that occurs at the lung interface is complex, resulting in images that require interpretation of the artifacts deep in the lungs. These images are not accurate spatial representations of the anatomy due to the almost total reflectivity and high impedance mismatch between aerated lung and chest wall. Here, we develop an approach based on the first principles of wave propagation physics in highly realistic maps of the human chest wall and lung to unveil a relationship between lung disease, tissue structure, and its resulting effects on ultrasound images. It is shown that Fullwave numerical simulations of ultrasound propagation and histology-derived acoustical maps model the multiple scattering physics at the lung interface and reproduce LUS B-mode images that are comparable to clinical images. However, unlike clinical imaging, the underlying tissue structure model is known and controllable. The amount of fluid and connective tissue components in the lung were gradually modified to model disease progression, and the resulting changes in B-mode images and non-imaging reverberation measures were analyzed to explain the relationship between pathological modifications of lung tissue and observed LUS.
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Affiliation(s)
- Oleksii Ostras
- Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Chapel Hill, North Carolina 27514, USA
| | - Ihor Shponka
- Department of Pathology and Forensic Medicine, Dnipro State Medical University, Dnipro, Ukraine
| | - Gianmarco Pinton
- Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Chapel Hill, North Carolina 27514, USA
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2
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Muruganandan S, Mishra E, Singh B. Breathlessness with Pleural Effusion: What Do We Know? Semin Respir Crit Care Med 2023. [PMID: 37308113 DOI: 10.1055/s-0043-1769098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Breathlessness is the most common symptom in individuals with pleural effusion and is often disabling. The pathophysiology of breathlessness associated with pleural effusion is complex. The severity of breathlessness correlates weakly with the size of the effusion. Improvements in ventilatory capacity following pleural drainage are small and correlate poorly with the volume of fluid drained and improvements in breathlessness. Impaired hemidiaphragm function and a compensatory increase in respiratory drive to maintain ventilation appear to be an important mechanism of breathlessness associated with pleural effusion. Thoracocentesis reduces diaphragm distortion and improves its movement; these changes appear to reduce respiratory drive and associated breathlessness by improving the neuromechanical efficiency of the diaphragm.
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Affiliation(s)
- Sanjeevan Muruganandan
- Department of Respiratory Medicine, The Northern Hospital, Melbourne, Australia
- School of Medicine, Health Sciences, Dentistry, University of Melbourne, Melbourne, Australia
| | - Eleanor Mishra
- Norwice Medical School, University of East Anglia, Norwich, Norfolk, United Kingdom
- Norwice Medical School, Norfolk and Norwich University Hospital NHS Foundation Trust, Norwich, Norfolk, United Kingdom
| | - Bhajan Singh
- Department of Pulmonary Physiology and Sleep Medicine, Sir Charles Gairdner Hospital, Perth, Australia
- School of Human Sciences, University of Western Australia, Perth, Australia
- West Australian Sleep Disorders Research Institute, Perth, Australia
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3
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Abstract
Pulmonary atelectasis is common in the perioperative period. Physiologically, it is produced when collapsing forces derived from positive pleural pressure and surface tension overcome expanding forces from alveolar pressure and parenchymal tethering. Atelectasis impairs blood oxygenation and reduces lung compliance. It is increasingly recognized that it can also induce local tissue biologic responses, such as inflammation, local immune dysfunction, and damage of the alveolar-capillary barrier, with potential loss of lung fluid clearance, increased lung protein permeability, and susceptibility to infection, factors that can initiate or exaggerate lung injury. Mechanical ventilation of a heterogeneously aerated lung (e.g., in the presence of atelectatic lung tissue) involves biomechanical processes that may precipitate further lung damage: concentration of mechanical forces, propagation of gas-liquid interfaces, and remote overdistension. Knowledge of such pathophysiologic mechanisms of atelectasis and their consequences in the healthy and diseased lung should guide optimal clinical management.
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4
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Herrmann P, Busana M, Cressoni M, Lotz J, Moerer O, Saager L, Meissner K, Quintel M, Gattinoni L. Using Artificial Intelligence for Automatic Segmentation of CT Lung Images in Acute Respiratory Distress Syndrome. Front Physiol 2021; 12:676118. [PMID: 34594233 PMCID: PMC8476971 DOI: 10.3389/fphys.2021.676118] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 08/17/2021] [Indexed: 01/17/2023] Open
Abstract
Knowledge of gas volume, tissue mass and recruitability measured by the quantitative CT scan analysis (CT-qa) is important when setting the mechanical ventilation in acute respiratory distress syndrome (ARDS). Yet, the manual segmentation of the lung requires a considerable workload. Our goal was to provide an automatic, clinically applicable and reliable lung segmentation procedure. Therefore, a convolutional neural network (CNN) was used to train an artificial intelligence (AI) algorithm on 15 healthy subjects (1,302 slices), 100 ARDS patients (12,279 slices), and 20 COVID-19 (1,817 slices). Eighty percent of this populations was used for training, 20% for testing. The AI and manual segmentation at slice level were compared by intersection over union (IoU). The CT-qa variables were compared by regression and Bland Altman analysis. The AI-segmentation of a single patient required 5–10 s vs. 1–2 h of the manual. At slice level, the algorithm showed on the test set an IOU across all CT slices of 91.3 ± 10.0, 85.2 ± 13.9, and 84.7 ± 14.0%, and across all lung volumes of 96.3 ± 0.6, 88.9 ± 3.1, and 86.3 ± 6.5% for normal lungs, ARDS and COVID-19, respectively, with a U-shape in the performance: better in the lung middle region, worse at the apex and base. At patient level, on the test set, the total lung volume measured by AI and manual segmentation had a R2 of 0.99 and a bias −9.8 ml [CI: +56.0/−75.7 ml]. The recruitability measured with manual and AI-segmentation, as change in non-aerated tissue fraction had a bias of +0.3% [CI: +6.2/−5.5%] and −0.5% [CI: +2.3/−3.3%] expressed as change in well-aerated tissue fraction. The AI-powered lung segmentation provided fast and clinically reliable results. It is able to segment the lungs of seriously ill ARDS patients fully automatically.
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Affiliation(s)
- Peter Herrmann
- Department of Anesthesiology, University Medical Center Göttingen, Göttingen, Germany
| | - Mattia Busana
- Department of Anesthesiology, University Medical Center Göttingen, Göttingen, Germany
| | | | - Joachim Lotz
- Institute for Diagnostic and Interventional Radiology, University Medical Center Göttingen, Göttingen, Germany
| | - Onnen Moerer
- Department of Anesthesiology, University Medical Center Göttingen, Göttingen, Germany
| | - Leif Saager
- Department of Anesthesiology, University Medical Center Göttingen, Göttingen, Germany
| | - Konrad Meissner
- Department of Anesthesiology, University Medical Center Göttingen, Göttingen, Germany
| | - Michael Quintel
- Department of Anesthesiology, University Medical Center Göttingen, Göttingen, Germany.,Department of Anesthesiology, DONAUISAR Klinikum Deggendorf, Deggendorf, Germany
| | - Luciano Gattinoni
- Department of Anesthesiology, University Medical Center Göttingen, Göttingen, Germany
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5
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Wendel Garcia PD, Caccioppola A, Coppola S, Pozzi T, Ciabattoni A, Cenci S, Chiumello D. Latent class analysis to predict intensive care outcomes in Acute Respiratory Distress Syndrome: a proposal of two pulmonary phenotypes. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2021; 25:154. [PMID: 33888134 PMCID: PMC8060783 DOI: 10.1186/s13054-021-03578-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Accepted: 04/13/2021] [Indexed: 02/07/2023]
Abstract
Background Acute respiratory distress syndrome remains a heterogeneous syndrome for clinicians and researchers difficulting successful tailoring of interventions and trials. To this moment, phenotyping of this syndrome has been approached by means of inflammatory laboratory panels. Nevertheless, the systemic and inflammatory expression of acute respiratory distress syndrome might not reflect its respiratory mechanics and gas exchange. Methods Retrospective analysis of a prospective cohort of two hundred thirty-eight patients consecutively admitted patients under mechanical ventilation presenting with acute respiratory distress syndrome. All patients received standardized monitoring of clinical variables, respiratory mechanics and computed tomography scans at predefined PEEP levels. Employing latent class analysis, an unsupervised structural equation modelling method, on respiratory mechanics, gas-exchange and computed tomography-derived gas- and tissue-volumes at a PEEP level of 5cmH2O, distinct pulmonary phenotypes of acute respiratory distress syndrome were identified. Results Latent class analysis was applied to 54 respiratory mechanics, gas-exchange and CT-derived gas- and tissue-volume variables, and a two-class model identified as best fitting. Phenotype 1 (non-recruitable) presented lower respiratory system elastance, alveolar dead space and amount of potentially recruitable lung volume than phenotype 2 (recruitable). Phenotype 2 (recruitable) responded with an increase in ventilated lung tissue, compliance and PaO2/FiO2 ratio (p < 0.001), in addition to a decrease in alveolar dead space (p < 0.001), to a standardized recruitment manoeuvre. Patients belonging to phenotype 2 (recruitable) presented a higher intensive care mortality (hazard ratio 2.9, 95% confidence interval 1.7–2.7, p = 0.001). Conclusions The present study identifies two ARDS phenotypes based on respiratory mechanics, gas-exchange and computed tomography-derived gas- and tissue-volumes. These phenotypes are characterized by distinctly diverse responses to a standardized recruitment manoeuvre and by a diverging mortality. Given multicentre validation, the simple and rapid identification of these pulmonary phenotypes could facilitate enrichment of future prospective clinical trials addressing mechanical ventilation strategies in ARDS. Supplementary Information The online version contains supplementary material available at 10.1186/s13054-021-03578-6.
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Affiliation(s)
- Pedro D Wendel Garcia
- Institute of Intensive Care Medicine, University Hospital of Zurich, Zurich, Switzerland
| | - Alessio Caccioppola
- Department of Anesthesia and Intensive Care, ASST Santi Paolo E Carlo, San Paolo University Hospital, Via Di Rudinì, Milan, Italy.,Department of Health Sciences, University of Milan, Milan, Italy
| | - Silvia Coppola
- Department of Anesthesia and Intensive Care, ASST Santi Paolo E Carlo, San Paolo University Hospital, Via Di Rudinì, Milan, Italy
| | - Tommaso Pozzi
- Department of Anesthesia and Intensive Care, ASST Santi Paolo E Carlo, San Paolo University Hospital, Via Di Rudinì, Milan, Italy.,Department of Health Sciences, University of Milan, Milan, Italy
| | - Arianna Ciabattoni
- Department of Anesthesia and Intensive Care, ASST Santi Paolo E Carlo, San Paolo University Hospital, Via Di Rudinì, Milan, Italy.,Department of Health Sciences, University of Milan, Milan, Italy
| | - Stefano Cenci
- Department of Anesthesia and Intensive Care, ASST Santi Paolo E Carlo, San Paolo University Hospital, Via Di Rudinì, Milan, Italy.,Department of Health Sciences, University of Milan, Milan, Italy
| | - Davide Chiumello
- Department of Anesthesia and Intensive Care, ASST Santi Paolo E Carlo, San Paolo University Hospital, Via Di Rudinì, Milan, Italy. .,Department of Health Sciences, University of Milan, Milan, Italy. .,Coordinated Research Center on Respiratory Failure, University of Milan, Milan, Italy.
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6
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Haaksma ME, Heldeweg MLA, Lopez Matta JE, Smit JM, van Trigt JD, Nooitgedacht JS, Elzo Kraemer CV, van de Wiel M, Girbes ARJ, Heunks L, van Westerloo DJ, Tuinman PR. Lung ultrasound findings in patients with novel SARS-CoV-2. ERJ Open Res 2020; 6:00238-2020. [PMID: 33257915 PMCID: PMC7548922 DOI: 10.1183/23120541.00238-2020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Accepted: 09/25/2020] [Indexed: 12/23/2022] Open
Abstract
Background Over 2 million people worldwide have been infected with severe acute respiratory distress syndrome-coronavirus-2 (SARS CoV-2). Lung ultrasound has been proposed to diagnose and monitor it, despite the fact that little is known about the ultrasound appearance due to the novelty of the illness. The aim of this manuscript is to characterise the lung ultrasonographic appearance of critically ill patients with SARS-CoV-2 pneumonia, with particular emphasis on its relationship with the time course of the illness and clinical parameters. Methods Adult patients from the intensive care unit of two academic hospitals who tested positive for SARS-CoV-2 were included. Images were analysed using internationally recognised techniques which included assessment of the pleura, number of B-lines, pathology in the PLAPS (posterolateral alveolar and/or pleural syndrome) point, bedside lung ultrasound in emergency profiles, and the lung ultrasound score. The primary outcomes were frequencies, percentages and differences in lung ultrasound findings overall and between short (≤14 days) and long (>14 days) durations of symptoms and their correlation with clinical parameters. Results In this pilot observational study, 61 patients were included with 76 examinations available for analysis. 26% of patients had no anterior lung abnormalities, while the most prevalent pathological ultrasound findings were thickening of the pleura (42%), ≥3 B-lines per view (38%) and presence of PLAPS (74%). Patients with "long" duration of symptoms presented more frequently with a thickened and irregular pleura (32 (21%) versus 11 (9%)), C-profile (18 (47%) versus 8 (25%)) and pleural effusion (14 (19%) versus 3 (5%)), compared to patients with short duration of symptoms. Lung ultrasound findings did not correlate with arterial oxygen tension/inspiratory oxygen fraction ratio, fluid balance or dynamic compliance. Conclusion SARS-CoV-2 results in significant, but not specific, ultrasound changes, with decreased lung sliding, thickening of the pleura and a B-profile being the most commonly observed. With time, a thickened and irregular pleura, C-profile and pleural effusion become more common findings. When screening patients, a comprehensive ultrasound protocol might be necessary.
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Affiliation(s)
- Mark E Haaksma
- Dept of Intensive Care Medicine, Amsterdam University Medical Centers, VUmc, Amsterdam, The Netherlands.,Amsterdam Cardiovascular Sciences Research Institute, Amsterdam University Medical Centers, Amsterdam, The Netherlands.,Amsterdam Leiden Intensive Care Focused Echography, Amsterdam, The Netherlands
| | - Micah L A Heldeweg
- Dept of Intensive Care Medicine, Amsterdam University Medical Centers, VUmc, Amsterdam, The Netherlands.,Amsterdam Cardiovascular Sciences Research Institute, Amsterdam University Medical Centers, Amsterdam, The Netherlands.,Amsterdam Leiden Intensive Care Focused Echography, Amsterdam, The Netherlands
| | - Jorge E Lopez Matta
- Amsterdam Leiden Intensive Care Focused Echography, Amsterdam, The Netherlands.,Dept of Intensive Care Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Jasper M Smit
- Dept of Intensive Care Medicine, Amsterdam University Medical Centers, VUmc, Amsterdam, The Netherlands.,Amsterdam Cardiovascular Sciences Research Institute, Amsterdam University Medical Centers, Amsterdam, The Netherlands.,Amsterdam Leiden Intensive Care Focused Echography, Amsterdam, The Netherlands
| | - Jessica D van Trigt
- Dept of Intensive Care Medicine, Amsterdam University Medical Centers, VUmc, Amsterdam, The Netherlands.,Amsterdam Cardiovascular Sciences Research Institute, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Jip S Nooitgedacht
- Dept of Intensive Care Medicine, Amsterdam University Medical Centers, VUmc, Amsterdam, The Netherlands.,Amsterdam Cardiovascular Sciences Research Institute, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Carlos V Elzo Kraemer
- Amsterdam Leiden Intensive Care Focused Echography, Amsterdam, The Netherlands.,Dept of Intensive Care Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Mark van de Wiel
- Dept of Epidemiology and Data Science, Amsterdam University Medical Centers, VUmc, Amsterdam, The Netherlands
| | - Armand R J Girbes
- Dept of Intensive Care Medicine, Amsterdam University Medical Centers, VUmc, Amsterdam, The Netherlands.,Amsterdam Cardiovascular Sciences Research Institute, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Leo Heunks
- Dept of Intensive Care Medicine, Amsterdam University Medical Centers, VUmc, Amsterdam, The Netherlands.,Amsterdam Cardiovascular Sciences Research Institute, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - David J van Westerloo
- Amsterdam Leiden Intensive Care Focused Echography, Amsterdam, The Netherlands.,Dept of Intensive Care Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Pieter R Tuinman
- Dept of Intensive Care Medicine, Amsterdam University Medical Centers, VUmc, Amsterdam, The Netherlands.,Amsterdam Cardiovascular Sciences Research Institute, Amsterdam University Medical Centers, Amsterdam, The Netherlands.,Amsterdam Leiden Intensive Care Focused Echography, Amsterdam, The Netherlands
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7
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Chiumello D, Caccioppola A, Pozzi T, Lusardi AC, De Giorgis V, Galanti V, Ferrari E, Coppola S. The assessment of esophageal pressure using different devices: a validation study. Minerva Anestesiol 2020; 86:1047-1056. [DOI: 10.23736/s0375-9393.20.14458-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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8
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Coppola S, Caccioppola A, Froio S, Formenti P, De Giorgis V, Galanti V, Consonni D, Chiumello D. Effect of mechanical power on intensive care mortality in ARDS patients. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2020; 24:246. [PMID: 32448389 PMCID: PMC7245621 DOI: 10.1186/s13054-020-02963-x] [Citation(s) in RCA: 63] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 05/08/2020] [Indexed: 02/06/2023]
Abstract
BACKGROUND In ARDS patients, mechanical ventilation should minimize ventilator-induced lung injury. The mechanical power which is the energy per unit time released to the respiratory system according to the applied tidal volume, PEEP, respiratory rate, and flow should reflect the ventilator-induced lung injury. However, similar levels of mechanical power applied in different lung sizes could be associated to different effects. The aim of this study was to assess the role both of the mechanical power and of the transpulmonary mechanical power, normalized to predicted body weight, respiratory system compliance, lung volume, and amount of aerated tissue on intensive care mortality. METHODS Retrospective analysis of ARDS patients previously enrolled in seven published studies. All patients were sedated, paralyzed, and mechanically ventilated. After 20 min from a recruitment maneuver, partitioned respiratory mechanics measurements and blood gas analyses were performed with a PEEP of 5 cmH2O while the remaining setting was maintained unchanged from the baseline. A whole lung CT scan at 5 cmH2O of PEEP was performed to estimate the lung gas volume and the amount of well-inflated tissue. Univariate and multivariable Poisson regression models with robust standard error were used to calculate risk ratios and 95% confidence intervals of ICU mortality. RESULTS Two hundred twenty-two ARDS patients were included; 88 (40%) died in ICU. Mechanical power was not different between survivors and non-survivors 14.97 [11.51-18.44] vs. 15.46 [12.33-21.45] J/min and did not affect intensive care mortality. The multivariable robust regression models showed that the mechanical power normalized to well-inflated tissue (RR 2.69 [95% CI 1.10-6.56], p = 0.029) and the mechanical power normalized to respiratory system compliance (RR 1.79 [95% CI 1.16-2.76], p = 0.008) were independently associated with intensive care mortality after adjusting for age, SAPS II, and ARDS severity. Also, transpulmonary mechanical power normalized to respiratory system compliance and to well-inflated tissue significantly increased intensive care mortality (RR 1.74 [1.11-2.70], p = 0.015; RR 3.01 [1.15-7.91], p = 0.025). CONCLUSIONS In our ARDS population, there is not a causal relationship between the mechanical power itself and mortality, while mechanical power normalized to the compliance or to the amount of well-aerated tissue is independently associated to the intensive care mortality. Further studies are needed to confirm this data.
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Affiliation(s)
- Silvia Coppola
- Department of Anesthesia and Intensive Care, ASST Santi Paolo e Carlo, San Paolo University Hospital, Milan, Italy
| | - Alessio Caccioppola
- Department of Anesthesia and Intensive Care, ASST Santi Paolo e Carlo, San Paolo University Hospital, Milan, Italy.,Department of Health Sciences, University of Milan, Milan, Italy
| | - Sara Froio
- Department of Anesthesia and Intensive Care, ASST Santi Paolo e Carlo, San Paolo University Hospital, Milan, Italy
| | - Paolo Formenti
- Department of Anesthesia and Intensive Care, ASST Santi Paolo e Carlo, San Paolo University Hospital, Milan, Italy
| | - Valentina De Giorgis
- Department of Anesthesia and Intensive Care, ASST Santi Paolo e Carlo, San Paolo University Hospital, Milan, Italy.,Department of Health Sciences, University of Milan, Milan, Italy
| | - Valentina Galanti
- Department of Anesthesia and Intensive Care, ASST Santi Paolo e Carlo, San Paolo University Hospital, Milan, Italy.,Department of Health Sciences, University of Milan, Milan, Italy
| | - Dario Consonni
- Epidemiology Unit, Fondazione IRCCS Ca' Granda - Ospedale Maggiore Policlinico, Milan, Italy
| | - Davide Chiumello
- Department of Anesthesia and Intensive Care, ASST Santi Paolo e Carlo, San Paolo University Hospital, Milan, Italy. .,Department of Health Sciences, University of Milan, Milan, Italy. .,Coordinated Research Center on Respiratory Failure, University of Milan, Milan, Italy. .,SC Anestesia e Rianimazione, ASST Santi Paolo e Carlo, Via Di Rudinì, Milan, Italy.
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9
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Sakurai M, Morinaga K, Shimoyama K, Mishima S, Oda J. Effects of pleural drainage on oxygenation in critically ill patients. Acute Med Surg 2020; 7:e489. [PMID: 32742663 PMCID: PMC7384977 DOI: 10.1002/ams2.489] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Revised: 01/24/2020] [Accepted: 01/26/2020] [Indexed: 12/02/2022] Open
Abstract
Aim Pleural effusion is common among critically ill patients and associated with clinical consequences; however, the benefits of draining pleural effusion remain debatable. Thus, we aimed to investigate pleural drainage effectiveness by focusing on preprocedure patient status. Methods We retrospectively analyzed 22 patients with pleural effusion. Gas exchange, ventilator settings, vital signs, inflammatory response, and nutrition status were examined preprocedure and 24 h and 1 week postprocedure. Data were analyzed using the non‐parametric test and discriminant analysis with receiver operating characteristic curves. Results The partial arterial oxygen pressure (PaO2) to fraction of inspiratory oxygen (FIO2) (P/F) ratio at 24 h was higher postdrainage than predrainage (250 ± 87 versus 196 ± 84, P < 0.05); however, no significant difference between the P/F ratio predrainage and 1 week postdrainage was noted. Patients were classified into effective and ineffective groups according to a 110% increase in the P/F ratio 1 week postdrainage compared with predrainage. The predrainage P/F ratio was lower in the effective group than in the ineffective group (165 ± 91 versus 217 ± 74, P < 0.05). Discriminant analysis showed the area under the receiver operating characteristic curve was 0.72; the cut‐off value of the predrainage P/F ratio (divided into effective and ineffective groups) was 174. Conclusions Pleural drainage could be effective in patients who have lower preprocedure P/F ratios.
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Affiliation(s)
- Masako Sakurai
- Department of Emergency and Critical Care Medicine Tokyo Medical University Tokyo Japan
| | - Kentaro Morinaga
- Department of Emergency and Critical Care Medicine Tokyo Medical University Tokyo Japan
| | - Keiichiro Shimoyama
- Department of Emergency and Critical Care Medicine Tokyo Medical University Tokyo Japan
| | - Shiro Mishima
- Department of Emergency and Critical Care Medicine Tokyo Medical University Tokyo Japan
| | - Jun Oda
- Department of Emergency and Critical Care Medicine Tokyo Medical University Tokyo Japan
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10
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Respiratory Mechanics, Lung Recruitability, and Gas Exchange in Pulmonary and Extrapulmonary Acute Respiratory Distress Syndrome. Crit Care Med 2020; 47:792-799. [PMID: 30908313 DOI: 10.1097/ccm.0000000000003715] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
OBJECTIVES Acute respiratory distress syndrome is a clinical syndrome characterized by a refractory hypoxemia due to an inflammatory and high permeability pulmonary edema secondary to direct or indirect lung insult (pulmonary and extrapulmonary form). Aim of this study was to evaluate in a large database of acute respiratory distress syndrome patients, the pulmonary versus extrapulmonary form in terms of respiratory mechanics, lung recruitment, gas exchange, and positive end-expiratory pressure response. DESIGN A secondary analysis of previously published data. PATIENTS One-hundred eighty-one sedated and paralyzed acute respiratory distress syndrome patients (age 60 yr [46-72 yr], body mass index 25 kg/m [22-28 kg/m], and PaO2/FIO2 184 ± 66). INTERVENTIONS Lung CT scan performed at 5 and 45 cm H2O. Two levels of positive end-expiratory pressure (5 and 15 cm H2O) were randomly applied. MEASUREMENTS AND MAIN RESULTS Ninety-seven and 84 patients had a pulmonary and extrapulmonary acute respiratory distress syndrome. The median time from intensive care admission to the CT scan and respiratory mechanics analysis was 4 days (interquartile range, 2-6). At both positive end-expiratory pressure levels, pulmonary acute respiratory distress syndrome presented a significantly lower PaO2/FIO2 and higher physiologic dead space compared with extrapulmonary acute respiratory distress syndrome. The lung and chest wall elastance were similar between groups. The intra-abdominal pressure was significantly higher in extrapulmonary compared with pulmonary acute respiratory distress syndrome (10 mm Hg [7-12 mm Hg] vs 7 mm Hg [5-8 mm Hg]). The lung weight and lung recruitability were significantly higher in pulmonary acute respiratory distress syndrome (1,534 g [1,286-1,835 g] vs 1,342 g [1,090-1,507 g] and 16% [9-25%] vs 9% [5-14%]). CONCLUSIONS In the early stage, pulmonary acute respiratory distress syndrome is characterized by a greater impairment of gas exchange and higher lung recruitability. The recognition of the origin of acute respiratory distress syndrome is important for a more customized ventilatory management.
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11
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Coppola S, Caccioppola A, Froio S, Ferrari E, Gotti M, Formenti P, Chiumello D. Dynamic hyperinflation and intrinsic positive end-expiratory pressure in ARDS patients. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2019; 23:375. [PMID: 31775830 PMCID: PMC6880369 DOI: 10.1186/s13054-019-2611-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Accepted: 09/13/2019] [Indexed: 02/02/2023]
Abstract
Background In ARDS patients, changes in respiratory mechanical properties and ventilatory settings can cause incomplete lung deflation at end-expiration. Both can promote dynamic hyperinflation and intrinsic positive end-expiratory pressure (PEEP). The aim of this study was to investigate, in a large population of ARDS patients, the presence of intrinsic PEEP, possible associated factors (patients’ characteristics and ventilator settings), and the effects of two different external PEEP levels on the intrinsic PEEP. Methods We made a secondary analysis of published data. Patients were ventilated with a tidal volume of 6–8 mL/kg of predicted body weight, sedated, and paralyzed. After a recruitment maneuver, a PEEP trial was run at 5 and 15 cmH2O, and partitioned mechanics measurements were collected after 20 min of stabilization. Lung computed tomography scans were taken at 5 and 45 cmH2O. Patients were classified into two groups according to whether or not they had intrinsic PEEP at the end of an expiratory pause. Results We enrolled 217 sedated, paralyzed patients: 87 (40%) had intrinsic PEEP with a median of 1.1 [1.0–2.3] cmH2O at 5 cmH2O of PEEP. The intrinsic PEEP significantly decreased with higher PEEP (1.1 [1.0–2.3] vs 0.6 [0.0–1.0] cmH2O; p < 0.001). The applied tidal volume was significantly lower (480 [430–540] vs 520 [445–600] mL at 5 cmH2O of PEEP; 480 [430–540] vs 510 [430–590] mL at 15 cmH2O) in patients with intrinsic PEEP, while the respiratory rate was significantly higher (18 [15–20] vs 15 [13–19] bpm at 5 cmH2O of PEEP; 18 [15–20] vs 15 [13–19] bpm at 15 cmH2O). At both PEEP levels, the total airway resistance and compliance of the respiratory system were not different in patients with and without intrinsic PEEP. The total lung gas volume and lung recruitability were also not different between patients with and without intrinsic PEEP (respectively 961 [701–1535] vs 973 [659–1433] mL and 15 [0–32] % vs 22 [0–36] %). Conclusions In sedated, paralyzed ARDS patients without a known obstructive disease, the amount of intrinsic PEEP during lung-protective ventilation is negligible and does not influence respiratory mechanical properties.
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Affiliation(s)
- Silvia Coppola
- Department of Anesthesia and Intensive Care, ASST Santi Paolo e Carlo, San Paolo University Hospital, Milan, Italy
| | | | - Sara Froio
- Department of Anesthesia and Intensive Care, ASST Santi Paolo e Carlo, San Paolo University Hospital, Milan, Italy
| | - Erica Ferrari
- Department of Health Sciences, University of Milan, Milan, Italy
| | - Miriam Gotti
- Department of Anesthesia and Intensive Care, ASST Santi Paolo e Carlo, San Paolo University Hospital, Milan, Italy
| | - Paolo Formenti
- Department of Anesthesia and Intensive Care, ASST Santi Paolo e Carlo, San Paolo University Hospital, Milan, Italy
| | - Davide Chiumello
- Department of Anesthesia and Intensive Care, ASST Santi Paolo e Carlo, San Paolo University Hospital, Milan, Italy. .,Department of Health Sciences, University of Milan, Milan, Italy. .,Coordinated Research Center on Respiratory Failure, University of Milan, Milan, Italy. .,SC Anestesia e Rianimazione, ASST Santi Paolo e Carlo, Via Di Rudinì, Milan, Italy.
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12
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Giosa L, Busana M, Pasticci I, Bonifazi M, Macrì MM, Romitti F, Vassalli F, Chiumello D, Quintel M, Marini JJ, Gattinoni L. Mechanical power at a glance: a simple surrogate for volume-controlled ventilation. Intensive Care Med Exp 2019; 7:61. [PMID: 31773328 PMCID: PMC6879677 DOI: 10.1186/s40635-019-0276-8] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 10/16/2019] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND Mechanical power is a summary variable including all the components which can possibly cause VILI (pressures, volume, flow, respiratory rate). Since the complexity of its mathematical computation is one of the major factors that delay its clinical use, we propose here a simple and easy to remember equation to estimate mechanical power under volume-controlled ventilation: [Formula: see text] where the mechanical power is expressed in Joules/minute, the minute ventilation (VE) in liters/minute, the inspiratory flow (F) in liters/minute, and peak pressure and positive end-expiratory pressure (PEEP) in centimeter of water. All the components of this equation are continuously displayed by any ventilator under volume-controlled ventilation without the need for clinician intervention. To test the accuracy of this new equation, we compared it with the reference formula of mechanical power that we proposed for volume-controlled ventilation in the past. The comparisons were made in a cohort of mechanically ventilated pigs (485 observations) and in a cohort of ICU patients (265 observations). RESULTS Both in pigs and in ICU patients, the correlation between our equation and the reference one was close to the identity. Indeed, the R2 ranged from 0.97 to 0.99 and the Bland-Altman showed small biases (ranging from + 0.35 to - 0.53 J/min) and proportional errors (ranging from + 0.02 to - 0.05). CONCLUSIONS Our new equation of mechanical power for volume-controlled ventilation represents a simple and accurate alternative to the more complex ones available to date. This equation does not need any clinical intervention on the ventilator (such as an inspiratory hold) and could be easily implemented in the software of any ventilator in volume-controlled mode. This would allow the clinician to have an estimation of mechanical power at a simple glance and thus increase the clinical consciousness of this variable which is still far from being used at the bedside. Our equation carries the same limitations of all other formulas of mechanical power, the most important of which, as far as it concerns VILI prevention, are the lack of normalization and its application to the whole respiratory system (including the chest wall) and not only to the lung parenchyma.
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Affiliation(s)
- Lorenzo Giosa
- Departement of Anesthesiology, Emergency and Intensive Care Medicine, University of Göttingen, Göttingen, Germany
| | - Mattia Busana
- Departement of Anesthesiology, Emergency and Intensive Care Medicine, University of Göttingen, Göttingen, Germany
| | - Iacopo Pasticci
- Departement of Anesthesiology, Emergency and Intensive Care Medicine, University of Göttingen, Göttingen, Germany
| | - Matteo Bonifazi
- Departement of Anesthesiology, Emergency and Intensive Care Medicine, University of Göttingen, Göttingen, Germany
| | - Matteo Maria Macrì
- Departement of Anesthesiology, Emergency and Intensive Care Medicine, University of Göttingen, Göttingen, Germany
| | - Federica Romitti
- Departement of Anesthesiology, Emergency and Intensive Care Medicine, University of Göttingen, Göttingen, Germany
| | - Francesco Vassalli
- Departement of Anesthesiology, Emergency and Intensive Care Medicine, University of Göttingen, Göttingen, Germany
| | - Davide Chiumello
- SC Anestesia e Rianimazione, Ospedale San Paolo - Polo Universitario, ASST Santi Paolo e Carlo, Milan, Italy
- Dipartimento di Scienze Biomediche per la Salute, Centro Ricerca Coordinato di Insufficienza Respiratoria, Università degli Studi di Milano, Milan, Italy
| | - Michael Quintel
- Departement of Anesthesiology, Emergency and Intensive Care Medicine, University of Göttingen, Göttingen, Germany
| | - J J Marini
- University of Minnesota and Regions Hospital, Minneapolis/St. Paul, MN, USA
| | - Luciano Gattinoni
- Departement of Anesthesiology, Emergency and Intensive Care Medicine, University of Göttingen, Göttingen, Germany.
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13
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Chiumello D, Sferrazza Papa GF, Artigas A, Bouhemad B, Grgic A, Heunks L, Markstaller K, Pellegrino GM, Pisani L, Rigau D, Schultz MJ, Sotgiu G, Spieth P, Zompatori M, Navalesi P. ERS statement on chest imaging in acute respiratory failure. Eur Respir J 2019; 54:13993003.00435-2019. [PMID: 31248958 DOI: 10.1183/13993003.00435-2019] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Accepted: 05/16/2019] [Indexed: 12/17/2022]
Abstract
Chest imaging in patients with acute respiratory failure plays an important role in diagnosing, monitoring and assessing the underlying disease. The available modalities range from plain chest X-ray to computed tomography, lung ultrasound, electrical impedance tomography and positron emission tomography. Surprisingly, there are presently no clear-cut recommendations for critical care physicians regarding indications for and limitations of these different techniques.The purpose of the present European Respiratory Society (ERS) statement is to provide physicians with a comprehensive clinical review of chest imaging techniques for the assessment of patients with acute respiratory failure, based on the scientific evidence as identified by systematic searches. For each of these imaging techniques, the panel evaluated the following items: possible indications, technical aspects, qualitative and quantitative analysis of lung morphology and the potential interplay with mechanical ventilation. A systematic search of the literature was performed from inception to September 2018. A first search provided 1833 references. After evaluating the full text and discussion among the committee, 135 references were used to prepare the current statement.These chest imaging techniques allow a better assessment and understanding of the pathogenesis and pathophysiology of patients with acute respiratory failure, but have different indications and can provide additional information to each other.
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Affiliation(s)
- Davide Chiumello
- SC Anestesia e Rianimazione, Ospedale San Paolo - Polo Universitario, ASST Santi Paolo e Carlo, Milan, Italy.,Dipartimento di Scienze della Salute, Centro Ricerca Coordinata di Insufficienza Respiratoria, Università degli Studi di Milano, Milan, Italy
| | | | - Antonio Artigas
- Corporacion Sanitaria, Universitaria Parc Tauli, CIBER de Enfermedades Respiratorias Autonomous University of Barcelona, Sabadell, Spain.,Intensive Care Dept, University Hospitals Sagrado Corazon - General de Cataluna, Quiron Salud, Barcelona-Sant Cugat del Valles, Spain
| | - Belaid Bouhemad
- Service d'Anesthésie - Réanimation, Université Bourgogne - Franche Comtè, lncumr 866L, Dijon, France
| | - Aleksandar Grgic
- Dept of Nuclear Medicine, Saarland University Medical Center, Homburg, Germany
| | - Leo Heunks
- Dept of Intensive Care Medicine, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Klaus Markstaller
- Dept of Anesthesia, General Intensive Care Medicine and Pain Therapy, Medical University of Vienna, Vienna, Austria
| | - Giulia M Pellegrino
- Dipartimento di Scienze della Salute, Centro Ricerca Coordinata di Insufficienza Respiratoria, Università degli Studi di Milano, Milan, Italy.,Casa di Cura del Policlinico, Dipartimento di Scienze Neuroriabilitative, Milan, Italy
| | - Lara Pisani
- Respiratory and Critical Care Unit, Alma Mater Studiorum, University of Bologna, Sant'Orsola Malpighi Hospital, Bologna, Italy
| | | | - Marcus J Schultz
- Mahidol-Oxford Tropical Medicine Research Unit, Mahidol University, Bangkok, Thailand
| | - Giovanni Sotgiu
- Clinical Epidemiology and Medical Statistics Unit, Dept of Clinical and Experimental Medicine, University of Sassari, Sassari, Italy
| | - Peter Spieth
- Dept of Anesthesiology and Critical Care Medicine, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.,Center for Clinical Research and Management Education, Division of Health Care Sciences, Dresden International University, Dresden, Germany
| | | | - Paolo Navalesi
- Anaesthesia and Intensive Care, Department of Medical and Surgical Sciences, University of Magna Graecia, Catanzaro, Italy
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14
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Razazi K, Boissier F, Neuville M, Jochmans S, Tchir M, May F, de Prost N, Brun-Buisson C, Carteaux G, Mekontso Dessap A. Pleural effusion during weaning from mechanical ventilation: a prospective observational multicenter study. Ann Intensive Care 2018; 8:103. [PMID: 30382473 PMCID: PMC6211142 DOI: 10.1186/s13613-018-0446-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 10/20/2018] [Indexed: 11/12/2022] Open
Abstract
Background Pleural effusion is common during invasive mechanical ventilation, but its role during weaning is unclear. We aimed at assessing the prevalence and risk factors for pleural effusion at initiation of weaning. We also assessed its impact on weaning outcomes and its evolution in patients with difficult weaning. Methods We performed a prospective multicenter study in five intensive care units in France. Two hundred and forty-nine patients were explored using ultrasonography. Presence of moderate-to-large pleural effusion (defined as a maximal interpleural distance ≥ 15 mm) was assessed at weaning start and during difficult weaning. Results Seventy-three (29%) patients failed weaning, including 46 (18%) who failed the first spontaneous breathing trial (SBT) and 39 (16%) who failed extubation. Moderate-to-large pleural effusion was detected in 81 (33%) patients at weaning start. Moderate-to-large pleural effusion was associated with more failures of the first SBT [27 (33%) vs. 19 (11%), p < 0.001], more weaning failures [37 (47%) vs. 36 (22%), p < 0.001], less ventilator-free days at day 28 [21 (5–24) vs. 23 (16–26), p = 0.01], and a higher mortality at day 28 [14 (17%) vs. 14 (8%), p = 0.04]. The association of pleural effusion with weaning failure persisted in multivariable analysis and sensitivity analyses. Short-term (48 h) fluid balance change was not associated with the evolution of interpleural distance in patients with difficult weaning. Conclusions In this multicenter observational study, pleural effusion was frequent during the weaning process and was associated with worse weaning outcomes. Electronic supplementary material The online version of this article (10.1186/s13613-018-0446-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Keyvan Razazi
- AP-HP, DHU A-TVB, Service de Réanimation Médicale, Hôpitaux Universitaires Henri Mondor, 94010, Créteil, France. .,Faculté de Médecine de Créteil, IMRB, GRC CARMAS, Université Paris Est Créteil, 94010, Créteil, France. .,Unité U955 (Institut Mondor de Recherche Biomédicale), INSERM, Créteil, France.
| | - Florence Boissier
- Service de Réanimation Médicale, Centre Hospitalier Universitaire de Poitiers, Poitiers, 86021, France.,AP-HP, Service de Réanimation Médicale, Hôpital Européen Georges Pompidou, 75015, Paris, France
| | - Mathilde Neuville
- AP-HP, Réanimation Médicale et des Maladies Infectieuses, Hôpital Bichat Claude Bernard, Paris, France
| | - Sébastien Jochmans
- Faculté de Médecine de Créteil, IMRB, GRC CARMAS, Université Paris Est Créteil, 94010, Créteil, France.,Département de Médecine Intensive, Groupe Hospitalier Sud Ile-de-France, Hôpital de Melun, 77011, Melun, France
| | - Martial Tchir
- Service de Réanimation, Centre Hospitalier de Villeneuve-Saint-Georges, 94190, Villeneuve-Saint-Georges, France
| | - Faten May
- AP-HP, DHU A-TVB, Service de Réanimation Médicale, Hôpitaux Universitaires Henri Mondor, 94010, Créteil, France.,Faculté de Médecine de Créteil, IMRB, GRC CARMAS, Université Paris Est Créteil, 94010, Créteil, France
| | - Nicolas de Prost
- AP-HP, DHU A-TVB, Service de Réanimation Médicale, Hôpitaux Universitaires Henri Mondor, 94010, Créteil, France.,Faculté de Médecine de Créteil, IMRB, GRC CARMAS, Université Paris Est Créteil, 94010, Créteil, France
| | - Christian Brun-Buisson
- AP-HP, DHU A-TVB, Service de Réanimation Médicale, Hôpitaux Universitaires Henri Mondor, 94010, Créteil, France.,Faculté de Médecine de Créteil, IMRB, GRC CARMAS, Université Paris Est Créteil, 94010, Créteil, France
| | - Guillaume Carteaux
- AP-HP, DHU A-TVB, Service de Réanimation Médicale, Hôpitaux Universitaires Henri Mondor, 94010, Créteil, France.,Faculté de Médecine de Créteil, IMRB, GRC CARMAS, Université Paris Est Créteil, 94010, Créteil, France
| | - Armand Mekontso Dessap
- AP-HP, DHU A-TVB, Service de Réanimation Médicale, Hôpitaux Universitaires Henri Mondor, 94010, Créteil, France.,Faculté de Médecine de Créteil, IMRB, GRC CARMAS, Université Paris Est Créteil, 94010, Créteil, France.,Unité U955 (Institut Mondor de Recherche Biomédicale), INSERM, Créteil, France
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15
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Dos Santos EDC, Pontes Campos AE, do Carmo OF, Lunardi AC. Comparing high and low levels of continuous positive airway pressure on lung aeration in patients with pleural drainage: A feasibility study for a randomized controlled trial. PHYSIOTHERAPY RESEARCH INTERNATIONAL 2018; 24:e1753. [PMID: 30378221 DOI: 10.1002/pri.1753] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Revised: 07/30/2018] [Accepted: 09/29/2018] [Indexed: 11/09/2022]
Abstract
OBJECTIVE We explored the feasibility of use of continuous positive airway pressure (CPAP) with 15- and 4-cmH2 O for a randomized controlled trial with patients with pleural drainage. METHODS Ten patients with traumatic pleural effusion drained within 24 hr, with controlled pain received randomly CPAP with 0-, 4-, and 15-cmH2 O. Computed tomography was used to assess the lung aeration. Patients reported the level of tolerability. Air leak was also observed as a parameter of safety. The levels of pressure were compared using the Friedman test followed by the Tukey test as post hoc. RESULTS The lung area under CPAP with 15 cmH2 O (median = 3,913 mm2 ; IQR = 3,416-4,390 mm2 ) was greater than 4 (median = 3,495 mm2 ; IQR = 3,075-3,954 mm2 ) and 0 cmH2 O (median = 3,382 mm2 ; IQR = 2,962-3,658 mm2 ; p < 0.001). There was no difference between lung areas under CPAP with 4 and 0 cmH2 O. All levels of pressure were well tolerated by patients. No air leak was observed during the assessments. CONCLUSION CPAP with 15 cmH2 O is able to expand lungs of patients with pleural drainage. CPAP with 4 cmH2 O seems not have therapeutic effect. In addition, CPAP with 15 cmH2 O is well tolerated and safe in this population.
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Affiliation(s)
- Elinaldo da Conceição Dos Santos
- Master and Doctoral Programs in Physical Therapy, Universidade Cidade de São Paulo, São Paulo, Brazil.,Department of Biological and Health Sciences, Universidade Federal do Amapá, Macapá, Brazil
| | | | | | - Adriana Claudia Lunardi
- Master and Doctoral Programs in Physical Therapy, Universidade Cidade de São Paulo, São Paulo, Brazil.,Department of Physical Therapy of School of Medicine, University of Sao Paulo, São Paulo, Brazil
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16
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Dorado JH, Accoce M, Plotnikow G. Chest wall effect on the monitoring of respiratory mechanics in acute respiratory distress syndrome. Rev Bras Ter Intensiva 2018; 30:208-218. [PMID: 29995087 PMCID: PMC6031425 DOI: 10.5935/0103-507x.20180038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2017] [Accepted: 11/14/2017] [Indexed: 11/23/2022] Open
Abstract
The respiratory system mechanics depend on the characteristics of the lung and
chest wall and their interaction. In patients with acute respiratory distress
syndrome under mechanical ventilation, the monitoring of airway plateau pressure
is fundamental given its prognostic value and its capacity to assess pulmonary
stress. However, its validity can be affected by changes in mechanical
characteristics of the chest wall, and it provides no data to correctly titrate
positive end-expiratory pressure by restoring lung volume. The chest wall effect
on respiratory mechanics in acute respiratory distress syndrome has not been
completely described, and it has likely been overestimated, which may lead to
erroneous decision making. The load imposed by the chest wall is negligible when
the respiratory system is insufflated with positive end-expiratory pressure.
Under dynamic conditions, moving this structure demands a pressure change whose
magnitude is related to its mechanical characteristics, and this load remains
constant regardless of the volume from which it is insufflated. Thus, changes in
airway pressure reflect changes in the lung mechanical conditions. Advanced
monitoring could be reserved for patients with increased intra-abdominal
pressure in whom a protective mechanical ventilation strategy cannot be
implemented. The estimates of alveolar recruitment based on respiratory system
mechanics could reflect differences in chest wall response to insufflation and
not actual alveolar recruitment.
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Affiliation(s)
- Javier Hernán Dorado
- Capítulo de Kinesiología Intensivista, Sociedad Argentina de Terapia Intensiva - Buenos Aires, Argentina.,Sanatorio Anchorena - Buenos Aires, Argentina.,Hospital General de Agudos Carlos G. Durand - Buenos Aires, Argentina
| | - Matías Accoce
- Capítulo de Kinesiología Intensivista, Sociedad Argentina de Terapia Intensiva - Buenos Aires, Argentina.,Hospital de Quemados - Buenos Aires, Argentina.,Sanatorio Anchorena San Martín - Buenos Aires, Argentina
| | - Gustavo Plotnikow
- Capítulo de Kinesiología Intensivista, Sociedad Argentina de Terapia Intensiva - Buenos Aires, Argentina.,Sanatorio Anchorena - Buenos Aires, Argentina
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17
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Vergani G, Cressoni M, Crimella F, L'Acqua C, Sisillo E, Gurgitano M, Liguori A, Annoni A, Carrafiello G, Chiumello D. A Morphological and Quantitative Analysis of Lung CT Scan in Patients With Acute Respiratory Distress Syndrome and in Cardiogenic Pulmonary Edema. J Intensive Care Med 2017; 35:284-292. [PMID: 29161936 DOI: 10.1177/0885066617743477] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
BACKGROUND The acute respiratory distress syndrome (ARDS) and cardiogenic pulmonary edema (CPE) are both characterized by an increase in lung edema that can be measured by computed tomography (CT). The aim of this study was to compare possible differences between patients with ARDS and CPE in the morphologic pattern, the aeration, and the amount and distribution of edema within the lung. METHODS Lung CT was performed at a mean positive end-expiratory pressure level of 5 cm H2O in both groups. The morphological evaluation was performed by two radiologists, while the quantitative evaluation was performed by a dedicated software. RESULTS A total of 60 patients with ARDS (20 mild, 20 moderate, 20 severe) and 20 patients with CPE were enrolled. The ground-glass attenuation regions were similarly present among the groups, 8 (40%), 8 (40%), 14 (70%), and 10 (50%), while the airspace consolidations were significantly more present in ARDS. The lung gas volume was significantly lower in severe ARDS compared to CPE (830 [462] vs 1120 [832] mL). Moving from the nondependent to the dependent lung regions, the not inflated lung tissue significantly increased, while the well inflated tissue decreased (ρ = 0.96-1.00, P < .0001). Significant differences were found between ARDS and CPE mostly in dependent regions. In severe ARDS, the estimated edema was significantly higher, compared to CPE (757 [740] vs 532 [637] g). CONCLUSIONS Both ARDS and CPE are characterized by a similar presence of ground-glass attenuation and different airspace consolidation regions. Acute respiratory distress syndrome has a higher amount of not inflated tissue and lower amount of well inflated tissue. However, the overall regional distribution is similar within the lung.
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Affiliation(s)
- Giordano Vergani
- Dipartimento di Scienze della Salute, Università degli Studi di Milano, Milan, Italy
| | - Massimo Cressoni
- Dipartimento di Scienze della Salute, Università degli Studi di Milano, Milan, Italy
| | - Francesco Crimella
- Scuola di Specialità di Anestesia, Rianimazione, Terapia Intensiva e del Dolore, Università degli Studi di Brescia, Brescia, Italy
| | - Camilla L'Acqua
- Department of Anesthesia and Intensive Care, IRCCS Centro Cardiologico Monzino, Milan, Italy
| | - Erminio Sisillo
- Department of Anesthesia and Intensive Care, IRCCS Centro Cardiologico Monzino, Milan, Italy
| | - Martina Gurgitano
- Postgraduation School in Radiodiagnostics, Università degli Studi di Milano, Milan, Italy
| | - Alessandro Liguori
- Postgraduation School in Radiodiagnostics, Università degli Studi di Milano, Milan, Italy
| | - Andrea Annoni
- Department of Cardiovascular Imaging, IRCCS Centro Cardiologico Monzino, Milan, Italy
| | - Gianpaolo Carrafiello
- Dipartimento di Scienze della Salute, Università degli Studi di Milano, Milan, Italy.,Radiologia diagnostica e interventistica, ASST Santi Paolo e Carlo, Milan, Italy
| | - Davide Chiumello
- Dipartimento di Scienze della Salute, Università degli Studi di Milano, Milan, Italy.,SC Anestesia e Rianimazione, ASST Santi Paolo e Carlo, Milan, Italy
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18
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Prevalence and Impact on Weaning of Pleural Effusion at the Time of Liberation from Mechanical Ventilation: A Multicenter Prospective Observational Study. Anesthesiology 2017; 126:1107-1115. [PMID: 28338483 DOI: 10.1097/aln.0000000000001621] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Pleural effusion is frequent in intensive care unit patients, but its impact on the outcome of weaning remains unknown. METHODS In a prospective study performed in three intensive care units, pleural ultrasound was performed at the first spontaneous breathing trial to detect and quantify pleural effusion (small, moderate, and large). Weaning failure was defined by a failed spontaneous breathing trial and/or extubation requiring any form of ventilatory support within 48 h. The primary endpoint was the prevalence of pleural effusion according to weaning outcome. RESULTS Pleural effusion was detected in 51 of 136 (37%) patients and was quantified as moderate to large in 18 (13%) patients. As compared to patients with no or small pleural effusion, their counterparts were more likely to have chronic renal failure (39 vs. 7%; P = 0.01), shock as the primary reason for admission (44 vs. 19%; P = 0.02), and a greater weight gain (+4 [0 to 7] kg vs. 0 [-1 to 5] kg; P = 0.02). The prevalence of pleural effusion was similar in weaning success and weaning failure patients (odds ratio, 1.23; 95% CI, 0.61 to 2.49; P = 0.56), as was the prevalence of moderate to large pleural effusion (odds ratio, 0.89; 95% CI, 0.33 to 2.41; P = 1.00). Duration of mechanical ventilation and intensive care unit length of stay were similar between patients with no or small pleural effusion and those with moderate to large pleural effusion. CONCLUSIONS Significant pleural effusion was observed in 13% of patients at the time of liberation from mechanical ventilation and was not associated with an alteration of weaning outcome. (ANESTHESIOLOGY 2017; 126:1107-15).
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19
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Chiumello D, Carlesso E, Brioni M, Cressoni M. Airway driving pressure and lung stress in ARDS patients. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2016; 20:276. [PMID: 27545828 PMCID: PMC4993008 DOI: 10.1186/s13054-016-1446-7] [Citation(s) in RCA: 106] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 08/01/2016] [Indexed: 01/06/2023]
Abstract
Background Lung-protective ventilation strategy suggests the use of low tidal volume, depending on ideal body weight, and adequate levels of PEEP. However, reducing tidal volume according to ideal body weight does not always prevent overstress and overstrain. On the contrary, titrating mechanical ventilation on airway driving pressure, computed as airway pressure changes from PEEP to end-inspiratory plateau pressure, equivalent to the ratio between the tidal volume and compliance of respiratory system, should better reflect lung injury. However, possible changes in chest wall elastance could affect the reliability of airway driving pressure. The aim of this study was to evaluate if airway driving pressure could accurately predict lung stress (the pressure generated into the lung due to PEEP and tidal volume). Methods One hundred and fifty ARDS patients were enrolled. At 5 and 15 cmH2O of PEEP, lung stress, driving pressure, lung and chest wall elastance were measured. Results The applied tidal volume (mL/kg of ideal body weight) was not related to lung gas volume (r2 = 0.0005 p = 0.772). Patients were divided according to an airway driving pressure lower and equal/higher than 15 cmH2O (the lower and higher airway driving pressure groups). At both PEEP levels, the higher airway driving pressure group had a significantly higher lung stress, respiratory system and lung elastance compared to the lower airway driving pressure group. Airway driving pressure was significantly related to lung stress (r2 = 0.581 p < 0.0001 and r2 = 0.353 p < 0.0001 at 5 and 15 cmH2O of PEEP). For a lung stress of 24 and 26 cmH2O, the optimal cutoff value for the airway driving pressure were 15.0 cmH2O (ROC AUC 0.85, 95 % CI = 0.782–0.922); and 16.7 (ROC AUC 0.84, 95 % CI = 0.742–0.936). Conclusions Airway driving pressure can detect lung overstress with an acceptable accuracy. However, further studies are needed to establish if these limits could be used for ventilator settings. Electronic supplementary material The online version of this article (doi:10.1186/s13054-016-1446-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Davide Chiumello
- Dipartimento di Emergenza-Urgenza, ASST Santi Paolo e Carlo, Milan, Italy. .,Dipartimento di Scienze della Salute, Università degli Studi di Milano, Milan, Italy.
| | - Eleonora Carlesso
- Dipartimento di Fisiopatologia medico-chirurgica e dei Trapianti, Università degli Studi di Milano, Milan, Italy
| | - Matteo Brioni
- Dipartimento di Fisiopatologia medico-chirurgica e dei Trapianti, Università degli Studi di Milano, Milan, Italy
| | - Massimo Cressoni
- Dipartimento di Fisiopatologia medico-chirurgica e dei Trapianti, Università degli Studi di Milano, Milan, Italy
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20
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Chiumello D, Colombo A, Algieri I, Mietto C, Carlesso E, Crimella F, Cressoni M, Quintel M, Gattinoni L. Effect of body mass index in acute respiratory distress syndrome. Br J Anaesth 2016; 116:113-21. [PMID: 26675954 DOI: 10.1093/bja/aev378] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Obesity is associated in healthy subjects with a great reduction in functional residual capacity and with a stiffening of lung and chest wall elastance, which promote alveolar collapse and hypoxaemia. Likewise, obese patients with acute respiratory distress syndrome (ARDS) could present greater derangements of respiratory mechanics than patients of normal weight. METHODS One hundred and one ARDS patients were enrolled. Partitioned respiratory mechanics and gas exchange were measured at 5 and 15 cm H2O of PEEP with a tidal volume of 6-8 ml kg(-1) of predicted body weight. At 5 and 45 cm H2O of PEEP, two lung computed tomography scans were performed. RESULTS Patients were divided as follows according to BMI: normal weight (BMI≤25 kg m(-2)), overweight (BMI between 25 and 30 kg m(-2)), and obese (BMI>30 kg m(-2)). Obese, overweight, and normal-weight groups presented a similar lung elastance (median [interquartile range], respectively: 17.7 [14.2-24.8], 20.9 [16.1-30.2], and 20.5 [15.2-23.6] cm H2O litre(-1) at 5 cm H2O of PEEP and 19.3 [15.5-26.3], 21.1 [17.4-29.2], and 17.1 [13.4-20.4] cm H2O litre(-1) at 15 cm H2O of PEEP) and chest elastance (respectively: 4.9 [3.1-8.8], 5.9 [3.8-8.7], and 7.8 [3.9-9.8] cm H2O litre(-1) at 5 cm H2O of PEEP and 6.5 [4.5-9.6], 6.6 [4.2-9.2], and 4.9 [2.4-7.6] cm H2O litre(-1) at 15 cm H2O of PEEP). Lung recruitability was not affected by the body weight (15.6 [6.3-23.4], 15.7 [9.8-22.2], and 11.3 [6.2-15.6]% for normal-weight, overweight, and obese groups, respectively). Lung gas volume was significantly lower whereas total superimposed pressure was significantly higher in the obese compared with the normal-weight group (1148 [680-1815] vs 827 [686-1213] ml and 17.4 [15.8-19.3] vs 19.3 [18.6-21.7] cm H2O, respectively). CONCLUSIONS Obese ARDS patients do not present higher chest wall elastance and lung recruitability.
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Affiliation(s)
- D Chiumello
- Dipartimento di Anestesia, Rianimazione (Intensiva e Subintensiva) e Terapia del Dolore, Fondazione IRCCS Ca' Granda - Ospedale Maggiore Policlinico, Milano, Italy Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy
| | - A Colombo
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy
| | - I Algieri
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy
| | - C Mietto
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy
| | - E Carlesso
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy
| | - F Crimella
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy
| | - M Cressoni
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy
| | - M Quintel
- Department of Anesthesiology, Emergency and Intensive Care Medicine, Georg-August University of Göttingen, Göttingen, Germany
| | - L Gattinoni
- Dipartimento di Anestesia, Rianimazione (Intensiva e Subintensiva) e Terapia del Dolore, Fondazione IRCCS Ca' Granda - Ospedale Maggiore Policlinico, Milano, Italy Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy
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Pesenti A, Musch G, Lichtenstein D, Mojoli F, Amato MBP, Cinnella G, Gattinoni L, Quintel M. Imaging in acute respiratory distress syndrome. Intensive Care Med 2016; 42:686-698. [DOI: 10.1007/s00134-016-4328-1] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 03/11/2016] [Indexed: 11/30/2022]
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Bloom MB, Serna-Gallegos D, Ault M, Khan A, Chung R, Ley EJ, Melo N, Margulies DR. Effect of Thoracentesis on Intubated Patients with Acute Lung Injury. Am Surg 2016. [DOI: 10.1177/000313481608200321] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Pleural effusions occur frequently in mechanically ventilated patients, but no consensus exists regarding the clinical benefit of effusion drainage. We sought to determine the impact of thoracentesis on gas exchange in patients with differing severities of acute lung injury (ALI). A retrospective analysis was conducted on therapeutic thoracenteses performed on intubated patients in an adult surgical intensive care unit of a tertiary center. Effusions judged by ultrasound to be 400 mL or larger were drained. Subjects were divided into groups based on their initial P:F ratios: normal >300, ALI 200 to 300, and acute respiratory distress syndrome (ARDS) <200. Baseline characteristics, physiologic variables, arterial blood gases, and ventilator settings before and after the intervention were analyzed. The primary end point was the change in measures of oxygenation. Significant improvements in P:F ratios (mean ± SD) were seen only in patients with ARDS (50.4 ± 38.5, P = 0.001) and ALI (90.6 ± 161.7, P = 0.022). Statistically significant improvement was observed in the pO2 (31.1, P = 0.005) and O2 saturation (4.1, P < 0.001) of the ARDS group. The volume of effusion removed did not correlate with changes in individual patient's oxygenation. These data support the role of therapeutic thoracentesis for intubated patients with abnormal P:F ratios.
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Affiliation(s)
| | | | - Mark Ault
- From the Cedars-Sinai Medical Center, Los Angeles, California
| | - Ahsan Khan
- From the Cedars-Sinai Medical Center, Los Angeles, California
| | - Rex Chung
- From the Cedars-Sinai Medical Center, Los Angeles, California
| | - Eric J. Ley
- From the Cedars-Sinai Medical Center, Los Angeles, California
| | - Nicolas Melo
- From the Cedars-Sinai Medical Center, Los Angeles, California
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Abstract
PURPOSE OF REVIEW Pleural effusions have a major impact on the cardiorespiratory system. This article reviews the pathophysiological effects of pleural effusions and pleural drainage, their relationship with breathlessness, and highlights key knowledge gaps. RECENT FINDINGS The basis for breathlessness in pleural effusions and relief following thoracentesis is not well understood. Many existing studies on the pathophysiology of breathlessness in pleural effusions are limited by small sample sizes, heterogeneous design and a lack of direct measurements of respiratory muscle function. Gas exchange worsens with pleural effusions and improves after thoracentesis. Improvements in ventilatory capacity and lung volumes following pleural drainage are small, and correlate poorly with the volume of fluid drained and the severity of breathlessness. Rather than lung compression, expansion of the chest wall, including displacement of the diaphragm, appears to be the principle mechanism by which the effusion is accommodated. Deflation of the thoracic cage and restoration of diaphragmatic function after thoracentesis may improve diaphragm effectiveness and efficiency, and this may be an important mechanism by which breathlessness improves. Effusions do not usually lead to major hemodynamic changes, but large effusions may cause cardiac tamponade and ventricular diastolic collapse. Patients with effusions can have impaired exercise capacity and poor sleep quality and efficiency. SUMMARY Pleural effusions are associated with abnormalities in gas exchange, respiratory mechanics, respiratory muscle function and hemodynamics, but the association between these abnormalities and breathlessness remains unclear. Prospective studies should aim to identify the key mechanisms of effusion-related breathlessness and predictors of improvement following pleural drainage.
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Abstract
PURPOSE OF REVIEW Measurements of lung volumes allow evaluating the pathophysiogical severity of acute respiratory distress syndrome (ARDS) in terms of the degree of reduction in aerated lung volume, calculating strain, quantifying recruitment and/or hyperinflation, and gas volume distribution. We summarize the current techniques for lung volume assessment selected according to their possible usage in the ICU and discuss the recent findings obtained with implementation of these techniques in patients with ARDS. RECENT FINDINGS Computed tomography technique remains irreplaceable in terms of quantitative aeration of different lung regions, but the commonly used cut-offs for classification may be questioned with recent findings on nonpathological lungs. Monitoring end expiratory lung volume using nitrogen washout technique enhanced our understanding on lung volume change during positioning, pleural effusion drainage, intra-abdominal hypertension, and recruitment maneuver. Recent studies supported that tidal volume could not surrogate tidal strain, which needs measurement of functional residual capacity and which is correlated with pro-inflammatory lung response. SUMMARY Although lung volume measurements are still limited to research area of ARDS, recent progress in technology provides clinicians more opportunities to evaluate lung volumes noninvasively at the bedside and may facilitate individualization of ventilator settings based on the specific physiological understandings of a given patient.
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Effects of pleural effusion drainage on oxygenation, respiratory mechanics, and hemodynamics in mechanically ventilated patients. Ann Am Thorac Soc 2015; 11:1018-24. [PMID: 25079591 DOI: 10.1513/annalsats.201404-152oc] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
OBJECTIVES In mechanically ventilated patients, the effect of draining pleural effusion on oxygenation is controversial. We investigated the effect of large pleural effusion drainage on oxygenation, respiratory function (including lung volumes), and hemodynamics in mechanically ventilated patients after ultrasound-guided drainage. Arterial blood gases, respiratory mechanics (airway, pleural and transpulmonary pressures, end-expiratory lung volume, respiratory system compliance and resistance), and hemodynamics (blood pressure, heart rate, and cardiac output) were recorded before and at 3 and 24 hours (H24) after pleural drainage. The respiratory settings were kept identical during the study period. MEASUREMENTS AND MAIN RESULTS The mean volume of effusion drained was 1,579 ± 684 ml at H24. Uncomplicated pneumothorax occurred in two patients. Respiratory mechanics significantly improved after drainage, with a decrease in plateau pressure and a large increase in end-expiratory transpulmonary pressure. Respiratory system compliance, end-expiratory lung volume, and PaO2/FiO2 ratio all improved. Hemodynamics were not influenced by drainage. Improvement in the PaO2/FiO2 ratio from baseline to H24 was positively correlated with the increase in end-expiratory lung volume during the same time frame (r = 0.52, P = 0.033), but not with drained volume. A high value of pleural pressure or a highly negative transpulmonary pressure at baseline predicted limited lung expansion following effusion drainage. A lesser improvement in oxygenation occurred in patients with ARDS. CONCLUSIONS Drainage of large (≥500 ml) pleural effusion in mechanically ventilated patients improves oxygenation and end-expiratory lung volume. Oxygenation improvement correlated with an increase in lung volume and a decrease in transpulmonary pressure, but was less so in patients with ARDS.
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Caironi P, Carlesso E, Cressoni M, Chiumello D, Moerer O, Chiurazzi C, Brioni M, Bottino N, Lazzerini M, Bugedo G, Quintel M, Ranieri VM, Gattinoni L. Lung recruitability is better estimated according to the Berlin definition of acute respiratory distress syndrome at standard 5 cm H2O rather than higher positive end-expiratory pressure: a retrospective cohort study. Crit Care Med 2015; 43:781-90. [PMID: 25513785 DOI: 10.1097/ccm.0000000000000770] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
OBJECTIVES The Berlin definition of acute respiratory distress syndrome has introduced three classes of severity according to PaO2/FIO2 thresholds. The level of positive end-expiratory pressure applied may greatly affect PaO2/FIO2, thereby masking acute respiratory distress syndrome severity, which should reflect the underlying lung injury (lung edema and recruitability). We hypothesized that the assessment of acute respiratory distress syndrome severity at standardized low positive end-expiratory pressure may improve the association between the underlying lung injury, as detected by CT, and PaO2/FIO2-derived severity. DESIGN Retrospective analysis. SETTING Four university hospitals (Italy, Germany, and Chile). PATIENTS One hundred forty-eight patients with acute lung injury or acute respiratory distress syndrome according to the American-European Consensus Conference criteria. INTERVENTIONS Patients underwent a three-step ventilator protocol (at clinical, 5 cm H2O, or 15 cm H2O positive end-expiratory pressure). Whole-lung CT scans were obtained at 5 and 45 cm H2O airway pressure. MEASUREMENTS AND MAIN RESULTS Nine patients did not fulfill acute respiratory distress syndrome criteria of the novel Berlin definition. Patients were then classified according to PaO2/FIO2 assessed at clinical, 5 cm H2O, or 15 cm H2O positive end-expiratory pressure. At clinical positive end-expiratory pressure (11±3 cm H2O), patients with severe acute respiratory distress syndrome had a greater lung tissue weight and recruitability than patients with mild or moderate acute respiratory distress syndrome (p<0.001). At 5 cm H2O, 54% of patients with mild acute respiratory distress syndrome at clinical positive end-expiratory pressure were reclassified to either moderate or severe acute respiratory distress syndrome. In these patients, lung recruitability and clinical positive end-expiratory pressure were higher than in patients who remained in the mild subgroup (p<0.05). When patients were classified at 5 cm H2O, but not at clinical or 15 cm H2O, lung recruitability linearly increases with acute respiratory distress syndrome severity (5% [2-12%] vs 12% [7-18%] vs 23% [12-30%], respectively, p<0.001). The potentially recruitable lung was the only CT-derived variable independently associated with ICU mortality (p=0.007). CONCLUSIONS The Berlin definition of acute respiratory distress syndrome assessed at 5 cm H2O allows a better evaluation of lung recruitability and edema than at higher positive end-expiratory pressure clinically set.
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Affiliation(s)
- Pietro Caironi
- 1Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Fondazione IRCCS Ca' Granda-Ospedale Maggiore Policlinico, Università degli Studi di Milano, Milan, Italy. 2Dipartimento di Anestesia, Rianimazione e Terapia del Dolore, Fondazione IRCCS Ca' Granda-Ospedale Maggiore Policlinico, Milan, Italy. 3Department of Anesthesiology, Emergency and Intensive Care Medicine, Georg-August University of Göttingen, Göttingen, Germany. 4Dipartimento di Radiologia, Fondazione IRCCS Ca' Granda-Ospedale Maggiore Policlinico, Milan, Italy. 5Departmentos de Anestesiologia y Medicina Intensiva, Facultad de Medicina, Pontificia, Universidad Catolica de Chile, Santiago, Chile. 6Dipartimento di Anestesia, Azienda Ospedaliera San Giovanni Battista-Molinette, Università degli Studi di Torino, Turin, Italy
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Albu G, Petak F, Zand T, Hallbäck M, Wallin M, Habre W. Lung volume assessments in normal and surfactant depleted lungs: agreement between bedside techniques and CT imaging. BMC Anesthesiol 2014; 14:64. [PMID: 25143759 PMCID: PMC4134664 DOI: 10.1186/1471-2253-14-64] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Accepted: 07/01/2014] [Indexed: 01/17/2023] Open
Abstract
Background Bedside assessment of lung volume in clinical practice is crucial to adapt ventilation strategy. We compared bedside measures of lung volume by helium multiple-breath washout technique (EELVMBW,He) and effective lung volume based on capnodynamics (ELV) to those assessed from spiral chest CT scans (EELVCT) under different PEEP levels in control and surfactant-depleted lungs. Methods Lung volume was assessed in anaesthetized mechanically ventilated rabbits successively by measuring i) ELV by analyzing CO2 elimination traces during the application of periods of 5 consecutive alterations in inspiratory/expiratory ratio (1:2 to 1.5:1), ii) measuring EELVMBW,He by using helium as a tracer gas, and iii) EELVCT from CT scan images by computing the normalized lung density. All measurements were performed at PEEP of 0, 3 and 9 cmH2O in random order under control condition and following surfactant depletion by whole lung lavage. Results Variables obtained with all techniques followed sensitively the lung volume changes with PEEP. Excellent correlation and close agreement was observed between EELVMBW,He and EELVCT (r = 0.93, p < 0.0001). ELV overestimated EELVMBW,He and EELVCT in normal lungs, whereas this difference was not evidenced following surfactant depletion. These findings resulted in somewhat diminished but still significant correlations between ELV and EELVCT (r = 0.58, p < 0.001) or EELVMBW,He (0.76, p < 0.001) and moderate agreements. Conclusions Lung volume assessed with bedside techniques allow the monitoring of the changes in the lung aeration with PEEP both in normal lungs and in a model of acute lung injury. Under stable pulmonary haemodynamic condition, ELV allows continuous lung volume monitoring, whereas EELVMBW,He offers a more accurate estimation, but intermittently.
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Affiliation(s)
- Gergely Albu
- Pathophysiological Experimental Platform, Department of Anaesthesiology, Pharmacology and Intensive Care, University of Geneva, 1 Rue Michel Servet, CH-1205 Geneva, Switzerland
| | - Ferenc Petak
- Department of Medical Physics and Informatics, University of Szeged, 9 Koranyi fasor, H-6720 Szeged, Hungary
| | - Tristan Zand
- Paediatric Radiology Unit, Department of Radiology and Nuclear Medicine, University Hospitals of Geneva, 6 rue Willy Donzé, CH-1205 Geneva, Switzerland
| | - Magnus Hallbäck
- Maquet Critical Care AB, Röntgenvägen 2, 17154 Solna, Sweden
| | - Mats Wallin
- Maquet Critical Care AB, Röntgenvägen 2, 17154 Solna, Sweden
| | - Walid Habre
- Pathophysiological Experimental Platform, Department of Anaesthesiology, Pharmacology and Intensive Care, University of Geneva, 1 Rue Michel Servet, CH-1205 Geneva, Switzerland ; Paediatric Anaesthesia Unit, Geneva Children's Hospital, University Hospitals of Geneva, 6, Rue Willy Donzé, CH-1205 Geneva, Switzerland
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Formenti P, Umbrello M, Piva IR, Mistraletti G, Zaniboni M, Spanu P, Noto A, Marini JJ, Iapichino G. Drainage of pleural effusion in mechanically ventilated patients: time to measure chest wall compliance? J Crit Care 2014; 29:808-13. [PMID: 24863983 DOI: 10.1016/j.jcrc.2014.04.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2014] [Revised: 04/19/2014] [Accepted: 04/20/2014] [Indexed: 11/29/2022]
Abstract
PURPOSE Pleural effusion (PE) is commonly encountered in mechanically ventilated, critically ill patients and is generally addressed with evacuation or by fluid displacement using increased airway pressure (P(AW)). However, except when massive or infected, clear evidence is lacking to guide its management. The aim of this study was to investigate the effect of recruitment maneuvers and drainage of unilateral PE on respiratory mechanics, gas exchange, and lung volume. MATERIALS AND METHODS Fifteen critically ill and mechanically ventilated patients with unilateral PE were enrolled. A 3-step protocol (baseline, recruitment, and effusion drainage) was applied to patients with more than 400 mL of PE, as estimated by chest ultrasound. Predefined subgroup analysis compared patients with normal vs reduced chest wall compliance (C(CW)). Esophageal and P(AW)s, respiratory system, lung and C(CW)s, arterial blood gases, and end-expiratory lung volumes were recorded. RESULTS In the whole case mix, neither recruitment nor drainage improved gas exchange, lung volume, or tidal mechanics. When C(CW) was normal, recruitment improved lung compliance (81.9 [64.8-104.1] vs 103.7 [91.5-111.7] mL/cm H2O, P < .05), whereas drainage had no significant effect on total respiratory system mechanics or gas exchange, although it measurably increased lung volume (1717 vs 2150 mL, P < .05). In the setting of reduced C(CW), however, recruitment had no significant effect on total respiratory system mechanics or gas exchange, whereas pleural drainage improved respiratory system and C(CW)s as well as lung volume (42.7 [38.9-50.0] vs 47.0 [43.8-63.3], P < .05 and 97.4 [89.3-97.9] vs 126.7 [92.3-153.8] mL/cm H2O, P < .05 and 1580 vs 1750 mL, P < .05, respectively). CONCLUSIONS Drainage of a moderate-sized effusion should not be routinely performed in unselected population of critically ill patients. We suggest that measurement of C(CW) may help in the decision-making process.
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Affiliation(s)
- Paolo Formenti
- Unità Operativa di Anestesia e Rianimazione, Azienda Ospedaliera San Paolo-Polo Universitario, Milano, Italy.
| | - Michele Umbrello
- Unità Operativa di Anestesia e Rianimazione, Azienda Ospedaliera San Paolo-Polo Universitario, Milano, Italy
| | - Ilaria R Piva
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy
| | - Giovanni Mistraletti
- Unità Operativa di Anestesia e Rianimazione, Azienda Ospedaliera San Paolo-Polo Universitario, Milano, Italy; Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy
| | - Matteo Zaniboni
- Dipartimento di Neuroscienze, Azienda Ospedaliera Ospedale Niguarda Ca' Granda, Milano, Italy
| | - Paolo Spanu
- Unità Operativa di Anestesia e Rianimazione, Azienda Ospedaliera San Paolo-Polo Universitario, Milano, Italy
| | - Andrea Noto
- Unità Operativa di Anestesia e Rianimazione, Azienda Ospedaliera San Paolo-Polo Universitario, Milano, Italy
| | - John J Marini
- Department of Pulmonary and Critical Care, University of Minnesota, Regions Hospital, St Paul, MN, USA
| | - Gaetano Iapichino
- Unità Operativa di Anestesia e Rianimazione, Azienda Ospedaliera San Paolo-Polo Universitario, Milano, Italy; Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy
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Chiumello D, Langer T, Vecchi V, Luoni S, Colombo A, Brioni M, Froio S, Cigada I, Coppola S, Protti A, Lazzerini M, Gattinoni L. Low-dose chest computed tomography for quantitative and visual anatomical analysis in patients with acute respiratory distress syndrome. Intensive Care Med 2014; 40:691-9. [DOI: 10.1007/s00134-014-3264-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Accepted: 03/06/2014] [Indexed: 01/15/2023]
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Bedside selection of positive end-expiratory pressure in mild, moderate, and severe acute respiratory distress syndrome. Crit Care Med 2014; 42:252-64. [PMID: 24196193 DOI: 10.1097/ccm.0b013e3182a6384f] [Citation(s) in RCA: 109] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVE Positive end-expiratory pressure exerts its effects keeping open at end-expiration previously collapsed areas of the lung; consequently, higher positive end-expiratory pressure should be limited to patients with high recruitability. We aimed to determine which bedside method would provide positive end-expiratory pressure better related to lung recruitability. DESIGN Prospective study performed between 2008 and 2011. SETTING Two university hospitals (Italy and Germany). PATIENTS Fifty-one patients with acute respiratory distress syndrome. INTERVENTIONS Whole lung CT scans were taken in static conditions at 5 and 45 cm H2O during an end-expiratory/end-inspiratory pause to measure lung recruitability. To select individual positive end-expiratory pressure, we applied bedside methods based on lung mechanics (ExPress, stress index), esophageal pressure, and oxygenation (higher positive end-expiratory pressure table of lung open ventilation study). MEASUREMENTS AND MAIN RESULTS Patients were classified in mild, moderate and severe acute respiratory distress syndrome. Positive end-expiratory pressure levels selected by the ExPress, stress index, and absolute esophageal pressures methods were unrelated with lung recruitability, whereas positive end-expiratory pressure levels selected by the lung open ventilation method showed a weak relationship with lung recruitability (r = 0.29; p < 0.0001). When patients were classified according to the acute respiratory distress syndrome Berlin definition, the lung open ventilation method was the only one which gave lower positive end-expiratory pressure levels in mild and moderate acute respiratory distress syndrome compared with severe acute respiratory distress syndrome (8 ± 2 and 11 ± 3 cm H2O vs 15 ± 3 cm H2O; p < 0.05), whereas ExPress, stress index, and esophageal pressure methods gave similar positive end-expiratory pressure values in mild, moderate, and severe acute respiratory distress syndrome. The positive end-expiratory pressure selected by the different methods were unrelated to each other with the exception of the two methods based on lung mechanics (ExPress and stress index). CONCLUSIONS Bedside positive end-expiratory pressure selection methods based on lung mechanics or absolute esophageal pressures provide positive end-expiratory pressure levels unrelated to lung recruitability and similar in mild, moderate, and severe acute respiratory distress syndrome, whereas the oxygenation-based method provided positive end-expiratory pressure levels related with lung recruitability progressively increasing from mild to moderate and severe acute respiratory distress syndrome.
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Abstract
PURPOSE OF REVIEW Malignant pleural effusion (MPE) is common. However, regardless of the differences between patients, their underlying cancer type, and pleural fluid characteristics, management options are often limited. These have not advanced significantly over the last 80 years since pleurodesis was first described. Correspondingly, patient-related outcome measures have been neglected. The evidence (or lack of) behind the current treatment recommendations is reviewed and key research questions are described. RECENT FINDINGS Talc continues to be the most effective sclerosant available for pleurodesis in MPE. A recent randomized controlled trial comparing talc pleurodesis and indwelling pleural catheter insertion as first-line therapy suggests these approaches are equally effective, and utilized a patient-based symptom score as the primary outcome. The need to acknowledge the advances in translational medicine and oncological therapies to measure patient-related trial outcomes and to target pleural fluid formation in MPE is discussed. SUMMARY Pulmonologists should be aware of the staggering lack of progress in the evidence that supports the current 'recommended' management of MPE. The need for a re-think about MPE management with a focus on alternative therapeutic targets and treatment objectives should be appreciated, in order to optimize future patient care.
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Faut-il drainer les épanchements pleuraux liquidiens des malades ventilés ? MEDECINE INTENSIVE REANIMATION 2014. [DOI: 10.1007/s13546-014-0835-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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