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Baglyas S, Valkó L, Móró V, Podmaniczky E, Czövek D, Makan G, Gingl Z, Gál J, Hantos Z, Lorx A. Using intra-breath oscillometry in obesity hypoventilation syndrome to detect tidal expiratory flow limitation: a potential marker to optimize CPAP therapy. BMC Pulm Med 2023; 23:477. [PMID: 38017501 PMCID: PMC10685591 DOI: 10.1186/s12890-023-02777-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 11/21/2023] [Indexed: 11/30/2023] Open
Abstract
BACKGROUND Continuous positive airway pressure (CPAP) therapy has profound effects in obesity hypoventilation syndrome (OHS). Current therapy initiation focuses on upper airway patency rather than the assessment of altered respiratory mechanics due to increased extrapulmonary mechanical load. METHODS We aimed to examine the viability of intra-breath oscillometry in optimizing CPAP therapy for OHS. We performed intra-breath oscillometry at 10 Hz in the sitting and supine positions, followed by measurements at increasing CPAP levels (none-5-10-15-20 cmH2O) in awake OHS patients. We plotted intra-breath resistance and reactance (Xrs) values against flow (V') and volume (V) to identify tidal expiratory flow limitation (tEFL). RESULTS Thirty-five patients (65.7% male) completed the study. We found a characteristic looping of the Xrs vs V' plot in all patients in the supine position revealing tEFL: Xrs fell with decreasing flow at end-expiration. Intra-breath variables representing expiratory decrease of Xrs became more negative in the supine position [end-expiratory Xrs (mean ± SD): -1.9 ± 1.8 cmH2O·s·L- 1 sitting vs. -4.2 ± 2.2 cmH2O·s·L- 1 supine; difference between end-expiratory and end-inspiratory Xrs: -1.3 ± 1.7 cmH2O·s·L- 1 sitting vs. -3.6 ± 2.0 cmH2O·s·L- 1 supine, p < 0.001]. Increasing CPAP altered expiratory Xrs values and loop areas, suggesting diminished tEFL (p < 0.001). 'Optimal CPAP' value (able to cease tEFL) was 14.8 ± 4.1 cmH2O in our cohort, close to the long-term support average of 13.01(± 2.97) cmH2O but not correlated. We found no correlation between forced spirometry values, patient characteristics, apnea-hypopnea index and intra-breath oscillometry variables. CONCLUSIONS tEFL, worsened by the supine position, can be diminished by stepwise CPAP application in most patients. Intra-breath oscillometry is a viable method to detect tEFL during CPAP initiation in OHS patients and tEFL is a possible target for optimizing therapy in OHS patients.
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Affiliation(s)
- Szabolcs Baglyas
- Department of Anesthesiology and Intensive Therapy, Semmelweis University, 1082 Üllői út 78/B, Budapest, Hungary.
| | - Luca Valkó
- Department of Anesthesiology and Intensive Therapy, Semmelweis University, 1082 Üllői út 78/B, Budapest, Hungary
| | - Vivien Móró
- Department of Anesthesiology and Intensive Therapy, Semmelweis University, 1082 Üllői út 78/B, Budapest, Hungary
| | - Eszter Podmaniczky
- Department of Anesthesiology and Intensive Therapy, Semmelweis University, 1082 Üllői út 78/B, Budapest, Hungary
| | - Dorottya Czövek
- Department of Pediatrics, Semmelweis University, Budapest, Hungary
| | - Gergely Makan
- Department of Technical Informatics, University of Szeged, Szeged, Hungary
| | - Zoltán Gingl
- Department of Technical Informatics, University of Szeged, Szeged, Hungary
| | - János Gál
- Department of Anesthesiology and Intensive Therapy, Semmelweis University, 1082 Üllői út 78/B, Budapest, Hungary
| | - Zoltán Hantos
- Department of Anesthesiology and Intensive Therapy, Semmelweis University, 1082 Üllői út 78/B, Budapest, Hungary
| | - András Lorx
- Department of Anesthesiology and Intensive Therapy, Semmelweis University, 1082 Üllői út 78/B, Budapest, Hungary
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Sahardin SN, Jailaini MFM, Abeed NNN, Ban AYL, Hau NB, Azmel AA, Shah SA, Hamid MFA. Impact of Aerobika ® oscillating positive expiratory pressure in improving small airway resistance, lung function, symptoms and exercise capacity in chronic obstructive pulmonary disease. Front Med (Lausanne) 2023; 10:1202380. [PMID: 37332765 PMCID: PMC10272579 DOI: 10.3389/fmed.2023.1202380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Accepted: 05/15/2023] [Indexed: 06/20/2023] Open
Abstract
Background Aerobika® oscillating positive expiratory pressure (OPEP) device promotes airway clearance in many respiratory diseases. However, studies have yet to focus on its effectiveness in improving small airway resistance via impulse oscillometry (IOS) measurement in COPD subjects. We aim to evaluate the improvement of small airway resistance (via IOS), lung function (spirometry), exercise capacity [via 6-min walking test (6MWT)], symptoms [COPD assessment test (CAT)] and severe exacerbation events among COPD subjects using Aerobika® OPEP. Methods This was a prospective, single-arm interventional study among COPD subjects with small airway disease. Subjects were instructed to use twice daily Aerobika® OPEP (10 min each session); for 24 weeks; as an additional to standard therapy. IOS, spirometry, 6MWT, CAT score and severe exacerbation events were evaluated at baseline, 12 weeks and 24 weeks. Results Fifty-three subjects completed the study. Aerobika® usage showed improvement of IOS parameters; e.g. measurement of airway resistance at 5 Hz (R5), cmH20/L/s, (12-week p = 0.008, 24-week p < 0.001), R5% predicted (12-week p = 0.007, 24-week p < 0.001) and small airway resistance (R5-R20), cmH20/L/s, (12-week p = 0.021, 24-week p < 0.001). There were improvement of lung function; e.g. FEV1, L (12-week p = 0.018, 24-week p = 0.001), FEV1% predicted (12-week p = 0.025, 24-week p = 0.001), FEF25-75, L (12-week p = 0.023, 24-week p = 0.002), and FEF25-75% predicted (12-week p = 0.024, 24-week p < 0.001). CAT score improved at 12 weeks (p < 0.001) and 24 weeks (p < 0.001). Subjects had improved exercise capacity (6MWT, metres) after 24 weeks (p = 0.016). However, there was no significant difference in severe exacerbation events 24 weeks before and after Aerobika® usage. Conclusion Aerobika® OPEP demonstrated significant improvement in small airway resistance as early as 12 weeks of usage, with sustained improvement at 24 weeks. Aerobika® OPEP administration had significantly improved lung function, 6MWT, and CAT scores over 24 weeks. There was no difference in severe exacerbation events.
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Affiliation(s)
- Siti Nurhanis Sahardin
- Respiratory Unit, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | | | - Nik Nuratiqah Nik Abeed
- Respiratory Unit, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Andrea Yu-Lin Ban
- Respiratory Unit, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Ng Boon Hau
- Respiratory Unit, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Azat Azrai Azmel
- Respiratory Unit, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Shamsul Azhar Shah
- Department of Community Medicine, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
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Determining Response to Treatment for Drug-Induced Bronchocentric Granulomatosis by the Forced Oscillation Technique. Medicina (B Aires) 2021; 57:medicina57121315. [PMID: 34946260 PMCID: PMC8704422 DOI: 10.3390/medicina57121315] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 11/13/2021] [Accepted: 11/25/2021] [Indexed: 11/29/2022] Open
Abstract
Anti-tumor necrosis factor alpha (TNFα) therapy is widely used to treat various inflammatory conditions. Paradoxically, there are several case reports describing the development of bronchocentric granulomatosis treated with TNFα inhibitors, and it is difficult to determine the effect of treatment using conventional spirometry because the lesions are located in small airways. However, it has been reported that the forced oscillation technique (FOT) is useful in the evaluation of small airway disease in bronchial asthma or chronic obstructive pulmonary disease. We performed the FOT to determine the effect of treatment on bronchocentric granulomatosis and found it to be useful. We report the case of a 55-year-old female with ulcerative colitis who was treated with golimumab and who developed bronchocentric granulomatosis as a sarcoid-like reaction to golimumab. She was successfully treated with prednisone, and the treatment efficacy was confirmed by the FOT. The FOT may be useful in the evaluation of small airway disease in bronchocentric granulomatosis. This case may help inform clinicians of the usefulness of the FOT to assess small airway disease in various diseases.
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Famokunwa B, Walsted ES, Hull JH. Assessing laryngeal function and hypersensitivity. Pulm Pharmacol Ther 2019; 56:108-115. [PMID: 31004747 DOI: 10.1016/j.pupt.2019.04.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 04/13/2019] [Accepted: 04/17/2019] [Indexed: 10/27/2022]
Abstract
The larynx is one of the most highly innervated organs in humans, adapted to simultaneously deliver several key respiratory functions including airway protection, swallowing and phonation. In some individuals the larynx can adopt a state that could be considered 'dysfunctional' or maladaptive; resulting in or contributing to a range of clinical disorders such as chronic refractory cough, inducible laryngeal obstruction (previously termed paradoxical vocal fold movement or vocal cord dysfunction), muscle tension dysphonia and globus pharyngeus. These disorders appear to display significant overlap in clinical symptomology and in many cases have features of concomitant or allied sensory dysfunction; often described as laryngeal hypersensitivity. The recognition and accurate assessment of both laryngeal dysfunction±hypersensitivity is important to ensure accurate diagnosis and effective delivery of targeted treatment and therapeutic monitoring. Accordingly, there is increasing in the methodologies proposed to assess laryngeal function. These range from simple questionnaires to targeted investigation(s), assessing both sensory function and the laryngeal motor response, under both resting and provoked situations. This review provides a brief overview of the current state of knowledge in the field of laryngeal dysfunction and hypersensitivity assessment.
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Affiliation(s)
- B Famokunwa
- Bristol Royal Infirmary, Bristol, BS2 8HW, UK
| | - E S Walsted
- Respiratory Research Unit, Bispebjerg Hospital, Copenhagen, Denmark; Department of Respiratory Medicine, Royal Brompton Hospital, London, SW3 6HP, UK
| | - J H Hull
- Department of Respiratory Medicine, Royal Brompton Hospital, London, SW3 6HP, UK.
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Longitudinal changes in pulmonary function and respiratory impedance of rheumatoid arthritis. Respir Physiol Neurobiol 2018; 261:1-8. [PMID: 30583069 DOI: 10.1016/j.resp.2018.12.008] [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: 09/27/2018] [Revised: 12/14/2018] [Accepted: 12/21/2018] [Indexed: 11/20/2022]
Abstract
The aim of this study was to examine long-term changes in pulmonary function and respiratory impedance (Zrs) as assessed by forced oscillation technique (FOT) of rheumatoid arthritis (RA)-related pulmonary disorders. Data of 42 RA patients who underwent pulmonary function tests and Zrs measurements at least twice at a >900-day interval were retrospectively reviewed. Zrs, respiratory resistance (Rrs) and reactance (Xrs), were measured as a function of oscillatory frequency from 4 to 36 Hz. The Rrs and difference between inspiratory and expiratory phases of Xrs were significantly decreased. Annual changes in Xrs parameters significantly correlated with those of spirometric parameters. Zrs parameters were significantly different between the low (the lower 75 percentile of incidence) and high (the top quartile) frequency of adverse respiratory event groups. The Zrs combined with spirometry may be beneficial to evaluate alterations in respiratory functions of RA.
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Forty years of reference values for respiratory system impedance in adults: 1977–2017. Respir Med 2018; 136:37-47. [DOI: 10.1016/j.rmed.2018.01.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 01/22/2018] [Accepted: 01/27/2018] [Indexed: 11/22/2022]
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Walsted ES, Hull JH, Hvedstrup J, Maat RC, Backer V. Validity and reliability of grade scoring in the diagnosis of exercise-induced laryngeal obstruction. ERJ Open Res 2017; 3:00070-2017. [PMID: 28765826 PMCID: PMC5532755 DOI: 10.1183/23120541.00070-2017] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 06/12/2017] [Indexed: 11/05/2022] Open
Abstract
The current gold-standard method for diagnosing exercise-induced laryngeal obstruction (EILO) is continuous laryngoscopy during exercise (CLE), with severity classified by a visual grade scoring system. We evaluated the precision of this approach, by evaluating test-retest reliability of CLE and both inter- and intra-rater variability. In this prospective case-control study, subjects completed four consecutive treadmill CLE tests under identical conditions. Laryngoscopic video recordings were anonymised and graded by three expert raters. 2 months following initial scoring, videos were re-randomised and rating repeated to assess intra-rater agreement. 20 subjects (16 cases and four controls) completed four CLE tests. The time to exhaustion increased by 30 s (95% CI 0.02-57.8, p<0.05) in the second CLE compared with the first test, but remained identical in the subsequent tests. Only one-third of subjects retained their initial diagnosis in the subsequent three tests. Inter-rater agreement on grade scores (weighted Cohen's ϰ) was 0.16-0.45, while intra-rater agreement ranged from 0.30 to 0.67. The CLE test is key in the diagnostic assessment of patients with EILO. However, the widely adopted visual grade scoring system does not appear to be a robust means for reliably classifying severity of EILO.
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Affiliation(s)
- Emil Schwarz Walsted
- Respiratory Research Unit, Dept of Respiratory Medicine, Bispebjerg University Hospital, Copenhagen, Denmark.,Dept of Respiratory Medicine, Royal Brompton Hospital, London, UK
| | - James H Hull
- Dept of Respiratory Medicine, Royal Brompton Hospital, London, UK
| | - Jeppe Hvedstrup
- Respiratory Research Unit, Dept of Respiratory Medicine, Bispebjerg University Hospital, Copenhagen, Denmark
| | | | - Vibeke Backer
- Respiratory Research Unit, Dept of Respiratory Medicine, Bispebjerg University Hospital, Copenhagen, Denmark
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Hull JH, Backer V, Gibson PG, Fowler SJ. Laryngeal Dysfunction: Assessment and Management for the Clinician. Am J Respir Crit Care Med 2017; 194:1062-1072. [PMID: 27575803 DOI: 10.1164/rccm.201606-1249ci] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The larynx is one of the most highly innervated organs in humans and serves a number of vitally important, complex, and highly evolved biological functions. On a day-to-day basis, the larynx functions autonomously, addressing several roles including airway protection, swallowing, and phonation. In some situations the larynx appears to adopt a functional state that could be considered maladaptive or "dysfunctional." This laryngeal dysfunction can underpin and account for a number of respiratory symptoms that otherwise appear incongruous with a clinical disease state and/or contribute to the development of symptoms that appear "refractory" to treatment. These include conditions associated with a heightened tendency for inappropriate laryngeal closure (e.g., inducible laryngeal obstruction), voice disturbance, and chronic cough. Recognition of laryngeal dysfunction is important to deliver targeted treatment and failure to recognize the condition can lead to repeated use of inappropriate treatment. Diagnosis is not straightforward, however, and many patients appear to present with symptoms attributable to laryngeal dysfunction, but in whom the diagnosis has been overlooked in clinical work-up for some time. This review provides an overview of the current state of knowledge in the field of laryngeal dysfunction, with a focus on pragmatic clinical assessment and management.
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Affiliation(s)
- James H Hull
- 1 Department of Respiratory Medicine, Respiratory Biomedical Research Unit, Royal Brompton & Harefield National Health Service Foundation Trust, London, United Kingdom
| | - Vibeke Backer
- 2 Department of Respiratory Medicine, Bispebjerg Hospital, Copenhagen, Denmark
| | - Peter G Gibson
- 3 Centre for Healthy Lungs, University of Newcastle, Newcastle, United Kingdom.,4 Department of Respiratory and Sleep Medicine, John Hunter Hospital, Newcastle, United Kingdom.,5 Hunter Medical Research Institute, Newcastle, Australia
| | - Stephen J Fowler
- 6 Centre for Respiratory Medicine and Allergy, University of Manchester, Manchester, United Kingdom; and.,7 Manchester Academic Health Science Centre, Manchester, United Kingdom
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Responsiveness to bronchodilator procaterol in COPD as assessed by forced oscillation technique. Respir Physiol Neurobiol 2017; 240:41-47. [PMID: 28238903 DOI: 10.1016/j.resp.2017.02.012] [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: 01/06/2017] [Accepted: 02/21/2017] [Indexed: 12/23/2022]
Abstract
The aim of this retrospective study was to assess responses to a bronchodilator by forced oscillation technique (FOT) and to relate the results of respiratory impedance (Zrs) to spirometric parameters in patients with chronic obstructive pulmonary disease (COPD). Zrs was measured as a function of frequency from 4 to 36Hz before and after inhalation of procaterol, a short-acting β2-agonist (n=60). Respiratory resistance (Rrs) and reactance (Xrs) were significantly frequency-dependent, and inspiratory and expiratory phases were different both before and after procaterol inhalation. The Rrs at 4Hz and Xrs at 4-20Hz during a whole breath were significantly improved after procaterol inhalation. The response to procaterol inhalation varied among patients, and changes in Xrs at 4Hz significantly correlated with% change in forced expiratory volume in one second and changes in forced vital capacity. Taken together, Zrs, and specifically Xrs parameters, are sensitive to acute physiological responses to a bronchodilator in COPD.
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Liu L, Liu W, Liu C, Wang D, Zhao J, Wang J, Wu J, Liu T, Zhang Y, Liu Y, Cao L, Dong L. Study on small airway function in asthmatics with fractional exhaled nitric oxide and impulse oscillometry. CLINICAL RESPIRATORY JOURNAL 2016; 12:483-490. [PMID: 27606596 DOI: 10.1111/crj.12548] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Revised: 07/08/2016] [Accepted: 08/30/2016] [Indexed: 01/12/2023]
Abstract
OBJECTIVES The invasive techniques can be direct and objective to assess small airway function, but they have significant risks and inconveniences for patients and cannot be repeated often. Some sophisticated techniques such as fractional exhaled nitric oxide (FeNO) and impulse oscillometry (IOS) may surmount such restrictions. Therefore, we investigated the relation among FeNO, IOS, and small airway function in asthmatic patients. METHODS We recruited 140 asthmatic patients including 69 patients with small airway normal function and 71 patients with small airway dysfunction. FeNO, eosinophil(EOS)count and total immunoglobulin E (IgE) in peripheral blood, pulmonary function, as well as IOS were measured. RESULTS The levels of FeNO, the reactance area (AX), the resonant frequency Fres and EOS were significantly increased in small airway dysfunction group compared with small airway normal function group (P < 0.01 respectively). A multiple regression model showed that FeNO, AX and Fres were correlative factors of mid forced expiratory flow of percentages of predicted values [FEF25-75 (%pred)] (P < 0.01, respectively). A receiver operating characteristic (ROC) analysis showed that the combination of FeNO, AX and Fres had a greater area under the ROC curve (AUC) than each of them (AUC: 0.881, P < .001, 95%CI: 0.815-0.929). CONCLUSION FeNO and IOS are helpful in diagnosis of small airway dysfunction with high sensitivity and specificity, and FeNO combined with IOS can better evaluate the small airway function in asthmatic patients.
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Affiliation(s)
- Lin Liu
- Department of Pulmonary Medicine, Qilu Hospital of Shandong University, Jinan, 250012, P.R. China
| | - Wen Liu
- Department of Pulmonary Medicine, Qilu Hospital of Shandong University, Jinan, 250012, P.R. China.,Department of Cadre Health Care, The Second Hospital of Shandong University, Jinan, 250033, P.R. China
| | - Chunhong Liu
- Department of Pulmonary Medicine, Qilu Hospital of Shandong University, Jinan, 250012, P.R. China
| | - Dexiang Wang
- Department of Pulmonary Medicine, Qilu Hospital of Shandong University, Jinan, 250012, P.R. China
| | - Jiping Zhao
- Department of Pulmonary Medicine, Qilu Hospital of Shandong University, Jinan, 250012, P.R. China
| | - Junfei Wang
- Department of Pulmonary Medicine, Qilu Hospital of Shandong University, Jinan, 250012, P.R. China
| | - Jinxiang Wu
- Department of Pulmonary Medicine, Qilu Hospital of Shandong University, Jinan, 250012, P.R. China
| | - Tian Liu
- Department of Pulmonary Medicine, Qilu Hospital of Shandong University, Jinan, 250012, P.R. China
| | - Yuanyuan Zhang
- Department of Pulmonary Medicine, Qilu Hospital of Shandong University, Jinan, 250012, P.R. China
| | - Yahui Liu
- Department of Pulmonary Medicine, Qilu Hospital of Shandong University, Jinan, 250012, P.R. China
| | - Liuzhao Cao
- Department of Pulmonary Medicine, Qilu Hospital of Shandong University, Jinan, 250012, P.R. China
| | - Liang Dong
- Department of Pulmonary Medicine, Qilu Hospital of Shandong University, Jinan, 250012, P.R. China
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Berger KI, Kalish S, Shao Y, Marmor M, Kazeros A, Oppenheimer BW, Chan Y, Reibman J, Goldring RM. Isolated small airway reactivity during bronchoprovocation as a mechanism for respiratory symptoms in WTC dust-exposed community members. Am J Ind Med 2016; 59:767-76. [PMID: 27582479 DOI: 10.1002/ajim.22639] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/12/2016] [Indexed: 11/10/2022]
Abstract
INTRODUCTION Small airway dysfunction occurs following WTC dust exposure, but its role in producing symptoms is unclear. METHODS Methacholine challenge (MCT) was used to assess the relationship between onset of respiratory symptoms and small airway abnormalities in 166 symptomatic WTC dust-exposed patients. Forced oscillation testing (FOT) and respiratory symptoms were assessed during MCT. FOT parameters included resistance at 5 and 20 Hz (R5 and R20 ) and the R5 minus R20 (R5-20 ). RESULTS Baseline spirometry was normal in all (mean FEV1 100 + 13% predicted, mean FEV1 /FVC 80 + 4%). MCT revealed bronchial hyperreactivity by spirometry in 67 patients. An additional 24 patients became symptomatic despite minimal FEV1 change (<5%); symptom onset coincided with increased R5 and R5-20 (P > 0.001 vs. baseline). The dose-response of FOT (reactivity) was greater compared with subjects that remained asymptomatic (P < 0.05). CONCLUSIONS FOT during MCT uncovered reactivity in small airways as a mechanism for respiratory symptoms in subjects with inhalational lung injury. Am. J. Ind. Med. 59:767-776, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Kenneth I. Berger
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine; NYU School of Medicine; New York New York
- Andre Cournand Pulmonary Physiology Laboratory; Bellevue Hospital; New York New York
| | - Samantha Kalish
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine; NYU School of Medicine; New York New York
| | - Yongzhao Shao
- Department of Population Health; NYU School of Medicine; New York New York
| | - Michael Marmor
- Department of Population Health; NYU School of Medicine; New York New York
| | - Angeliki Kazeros
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine; NYU School of Medicine; New York New York
| | - Beno W. Oppenheimer
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine; NYU School of Medicine; New York New York
- Andre Cournand Pulmonary Physiology Laboratory; Bellevue Hospital; New York New York
| | - Yinny Chan
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine; NYU School of Medicine; New York New York
- Andre Cournand Pulmonary Physiology Laboratory; Bellevue Hospital; New York New York
| | - Joan Reibman
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine; NYU School of Medicine; New York New York
| | - Roberta M. Goldring
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine; NYU School of Medicine; New York New York
- Andre Cournand Pulmonary Physiology Laboratory; Bellevue Hospital; New York New York
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Walsted ES, Hull JH, Sverrild A, Porsbjerg C, Backer V. Bronchial provocation testing does not detect exercise-induced laryngeal obstruction. J Asthma 2016; 54:77-83. [PMID: 27285291 DOI: 10.1080/02770903.2016.1195843] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
INTRODUCTION Exercise-induced laryngeal obstruction (EILO) is a key differential diagnosis for asthma in the presence of exertional respiratory symptoms. Continuous laryngoscopy during exercise (CLE), the current gold standard diagnostic test for EILO, has practical limitations. We aimed to establish if inspiratory flow data obtained during standard bronchoprovocation testing, to establish the presence of extra-thoracic hyper-responsiveness, may prove diagnostic for EILO and thus preclude requirement for CLE testing. METHODS We consecutively evaluated 37 adult subjects with exertional dyspnea and possible asthma referred over 6 months. All subjects received comprehensive assessment including a detailed clinical evaluation; pulmonary function testing, indirect and direct bronchial provocation testing, and CLE testing. RESULTS Out of 37 subjects, moderate or severe EILO was diagnosed in 8 subjects (22%, all female) while 5 (14%) had both asthma and EILO. There was no correlation between degree of EILO during CLE and mean decrease in forced inspiratory flow (%FIF50) obtained during neither the Methacholine (r = -0.15; p = 0.38) nor Mannitol (r = 0.04; p = 0.84) provocation tests. CONCLUSION Inspiratory flow parameters obtained during bronchoprovocation tests did not reliably detect EILO. It remains that CLE is an important and key investigation modality in establishing a secure diagnosis of EILO.
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Affiliation(s)
- Emil Schwarz Walsted
- a Respiratory Research Unit, Department of Respiratory Medicine , Bispebjerg University Hospital , Copenhagen , Denmark
| | - James H Hull
- b Department of Respiratory Medicine , Royal Brompton Hospital , London , United Kingdom
| | - Asger Sverrild
- a Respiratory Research Unit, Department of Respiratory Medicine , Bispebjerg University Hospital , Copenhagen , Denmark
| | - Celeste Porsbjerg
- a Respiratory Research Unit, Department of Respiratory Medicine , Bispebjerg University Hospital , Copenhagen , Denmark
| | - Vibeke Backer
- a Respiratory Research Unit, Department of Respiratory Medicine , Bispebjerg University Hospital , Copenhagen , Denmark
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Sokai R, Ito S, Iwano S, Uchida A, Aso H, Kondo M, Ishiguro N, Kojima T, Hasegawa Y. Respiratory mechanics measured by forced oscillation technique in rheumatoid arthritis-related pulmonary abnormalities: frequency-dependence, heterogeneity and effects of smoking. SPRINGERPLUS 2016; 5:335. [PMID: 27064652 PMCID: PMC4792822 DOI: 10.1186/s40064-016-1952-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Accepted: 02/29/2016] [Indexed: 11/10/2022]
Abstract
Rheumatoid arthritis (RA)-related pulmonary disorders specifically airway abnormalities and interstitial pneumonia (IP) are important extra-articular manifestations. The forced oscillation technique (FOT) is a useful method to assess respiratory impedance, respiratory resistance (Rrs) and reactance (Xrs), at different oscillatory frequencies during tidal breathing. The aim of this study was to characterize the respiratory mechanics of patients with RA and to relate them to parameters of the pulmonary function test and findings of chest CT images. Respiratory impedance of RA patients (n = 69) was measured as a function of frequency from 4 to 36 Hz using the FOT device and compared with that of healthy subjects (n = 10). Data were retrospectively reviewed. Patients were female-dominant (60.9 %) and 95.7 % had abnormal CT findings including airway and parenchymal abnormalities. Thirty-seven of 69 patients (53.6 %) were smokers. Rrs was significantly frequency-dependent in RA patients but not in the healthy subjects. Xrs were significantly frequency-dependent in both RA and healthy groups. Rrs was significantly higher during an expiratory phase in both RA and healthy groups. Xrs was significantly lower (more negative) during an expiratory phase than that during an inspiratory phase in RA patients but not in healthy subjects. Xrs of the RA group was significantly more negative than that of the normal control. There was no difference in impedance parameters between the airway lesion dominant (n = 27) and IP dominant groups (n = 23) in the RA group. The impedance parameters of the RA group significantly correlated with most parameters of the pulmonary function test. In pulmonary function test results, % of the predicted value for forced expiratory flow from 25 to 75 % of forced vital capacity was significantly lower and % of the predicted value for diffusing capacity of the lung for carbon monoxide was higher in the airway lesion dominant group than those in the IP dominant group. Krebs von den Lungen-6, a serum indicator of IP, was significantly higher in the IP group than that in the airway lesion dominant group. Taken together, the impedance results reflect abnormalities in pulmonary functions and structures in patients with RA.
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Affiliation(s)
- Risa Sokai
- Department of Respiratory Medicine, Nagoya University School of Medicine, Nagoya, 466-8550 Japan
| | - Satoru Ito
- Department of Respiratory Medicine, Nagoya University School of Medicine, Nagoya, 466-8550 Japan
| | - Shingo Iwano
- Department of Radiology, Nagoya University School of Medicine, Nagoya, 466-8550 Japan
| | - Akemi Uchida
- Department of Clinical Laboratory, Nagoya University School of Medicine, Nagoya, 466-8550 Japan
| | - Hiromichi Aso
- Department of Respiratory Medicine, Nagoya University School of Medicine, Nagoya, 466-8550 Japan
| | - Masashi Kondo
- Department of Respiratory Medicine, Nagoya University School of Medicine, Nagoya, 466-8550 Japan
| | - Naoki Ishiguro
- Department of Orthopedic Surgery and Rheumatology, Nagoya University School of Medicine, Nagoya, 466-8550 Japan
| | - Toshihisa Kojima
- Department of Orthopedic Surgery and Rheumatology, Nagoya University School of Medicine, Nagoya, 466-8550 Japan
| | - Yoshinori Hasegawa
- Department of Respiratory Medicine, Nagoya University School of Medicine, Nagoya, 466-8550 Japan
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14
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Berger KI, Turetz M, Liu M, Shao Y, Kazeros A, Parsia S, Caplan-Shaw C, Friedman SM, Maslow CB, Marmor M, Goldring RM, Reibman J. Oscillometry complements spirometry in evaluation of subjects following toxic inhalation. ERJ Open Res 2015; 1:00043-2015. [PMID: 27730155 PMCID: PMC5005120 DOI: 10.1183/23120541.00043-2015] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 10/12/2015] [Indexed: 01/02/2023] Open
Abstract
The World Trade Center (WTC) destruction released dust and fumes into the environment. Although many community members developed respiratory symptoms, screening spirometry was usually normal. We hypothesised that forced oscillation testing would identify functional abnormalities undetected by spirometry and that symptom severity would relate to magnitude of abnormalities measured by oscillometry. A symptomatic cohort (n=848) from the Bellevue Hospital WTC Environmental Health Center was evaluated and compared to an asymptomatic cohort (n=475) from the New York City Department of Health WTC Health Registry. Spirometry and oscillometry were performed. Oscillometry measurements included resistance (R5) and frequency dependence of resistance (R5-20). Spirometry was normal for the majority of subjects (73.2% symptomatic versus 87.6% asymptomatic, p<0.0001). In subjects with normal spirometry, R5 and R5-20 were higher in symptomatic versus asymptomatic subjects (median (interquartile range) R5 0.436 (0.206) versus 0.314 (0.129) kPa·L-1·s-1, p<0.001; R5-20 0.075 (0.085) versus 0.004 (0.042) kPa·L-1·s-1, p<0.0001). In symptomatic subjects, R5 and R5-20 increased with increasing severity and frequency of wheeze (p<0.05). Measurement of R5-20 correlated with the presence and severity of symptoms even when spirometry was within normal limits. These findings are in accord with small airway abnormalities as a potential explanation of the respiratory symptoms.
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Affiliation(s)
- Kenneth I Berger
- Dept of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, New York University School of Medicine, New York, NY, USA; André Cournand Pulmonary Physiology Laboratory, Bellevue Hospital, New York, NY, USA; These authors contributed equally to this manuscript
| | - Meredith Turetz
- Dept of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, New York University School of Medicine, New York, NY, USA; These authors contributed equally to this manuscript
| | - Mengling Liu
- Department of Population Health, New York University School of Medicine, New York, NY, USA
| | - Yongzhao Shao
- Department of Population Health, New York University School of Medicine, New York, NY, USA
| | - Angeliki Kazeros
- Dept of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, New York University School of Medicine, New York, NY, USA
| | - Sam Parsia
- Dept of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, New York University School of Medicine, New York, NY, USA
| | - Caralee Caplan-Shaw
- Dept of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, New York University School of Medicine, New York, NY, USA
| | - Stephen M Friedman
- New York City Department of Health and Mental Hygiene, New York, NY, USA
| | - Carey B Maslow
- New York City Department of Health and Mental Hygiene, New York, NY, USA
| | - Michael Marmor
- Department of Population Health, New York University School of Medicine, New York, NY, USA
| | - Roberta M Goldring
- Dept of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, New York University School of Medicine, New York, NY, USA; André Cournand Pulmonary Physiology Laboratory, Bellevue Hospital, New York, NY, USA
| | - Joan Reibman
- Dept of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, New York University School of Medicine, New York, NY, USA
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15
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Enright PL. COUNTERPOINT: Should Oscillometry Be Used to Screen for Airway Disease? No. Chest 2015; 148:1135-1136. [DOI: 10.1378/chest.15-1038] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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