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Urquhart DS, Dowle H, Moffat K, Forster J, Cunningham S, Macleod KA. Lung clearance index (LCI 2.5) changes after initiation of Elexacaftor/Tezacaftor/Ivacaftor in children with cystic fibrosis aged between 6 and 11 years: The "real-world" differs from trial data. Pediatr Pulmonol 2024; 59:1449-1453. [PMID: 38415920 DOI: 10.1002/ppul.26938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 02/02/2024] [Accepted: 02/14/2024] [Indexed: 02/29/2024]
Abstract
BACKGROUND Elexacaftor in combination with Tezacaftor and Ivacaftor (ETI) became licensed in the United Kingdom in early 2022 for children aged 6-11 years with cystic fibrosis (CF) and an eligible mutation. Many in this age group have excellent prior lung health making quantitative measurement of benefit challenging. Clinical trials purport that lung clearance index (LCI2.5) measurement is most suitable for this purpose. OBJECTIVES This study aimed to understand the clinical utility of LCI2.5 in detecting change after commencing ETI in the real world. PATIENT SELECTION/METHODS Baseline anthropometric data were collected along with spirometry (forced expiratory volume in 1 s [FEV1], forced vital capacityFV and LCI2.5 measures in children aged 6-11 years with CF before starting ETI. Measures were repeated after a mean (range) of 8.2 (7-14) months of ETI treatment. The primary endpoint was a change in LCI2.5, with secondary endpoints including change in FEV1 and change in body mass index (BMI) also reported. RESULTS Twelve children were studied (seven male, mean age 9.5 years at baseline). Our study population had a mean (SD) LCI2.5 of 7.01 (1.14) and FEV1 of 96 (13) %predicted at baseline. Mean (95% confidence interval) changes in LCI2.5 [-0.7 (-1.4, 0), p = .06] and BMI [+0.7 (+0.1, +1.3), p = .03] were observed, along with changes in FEV1 of +3.1 (-1.9, +8.1) %predicted. CONCLUSIONS Real-world changes in LCI2.5 (-0.7) are different to those reported in clinical trials (-2.29). Lower baseline LCI2.5 as a result of prior modulator exposure, high baseline lung health, and new LCI2.5 software analyses all contribute to lower LCI2.5 values being recorded in the real world of children with CF.
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Affiliation(s)
- Don S Urquhart
- Department of Paediatric Respiratory and Sleep Medicine, Royal Hospital for Children and Young People, Edinburgh, UK
- Department of Child Life and Health, Edinburgh Bioquarter, University of Edinburgh, Edinburgh, UK
| | - Heather Dowle
- Department of Paediatric Respiratory and Sleep Medicine, Royal Hospital for Children and Young People, Edinburgh, UK
| | - Kellie Moffat
- Department of Paediatric Respiratory and Sleep Medicine, Royal Hospital for Children and Young People, Edinburgh, UK
| | - Jody Forster
- Department of Paediatric Respiratory and Sleep Medicine, Royal Hospital for Children and Young People, Edinburgh, UK
| | - Steve Cunningham
- Department of Paediatric Respiratory and Sleep Medicine, Royal Hospital for Children and Young People, Edinburgh, UK
- Department of Child Life and Health, Edinburgh Bioquarter, University of Edinburgh, Edinburgh, UK
- Centre for Inflammation Research, Institute for Regeneration and Repair, The University of Edinburgh, Edinburgh, UK
| | - Kenneth A Macleod
- Department of Paediatric Respiratory and Sleep Medicine, Royal Hospital for Children and Young People, Edinburgh, UK
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Oestreich MA, Wyler F, Buess C, Etter B, Ramsey KA, Latzin P. Signal-correction errors in the EasyOne Pro LAB multiple-breath washout device significantly impact outcomes in children and adults. J Appl Physiol (1985) 2024; 136:460-471. [PMID: 38269412 DOI: 10.1152/japplphysiol.00096.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 01/16/2024] [Indexed: 01/26/2024] Open
Abstract
Multiple-breath washout (MBW) is an established technique to assess functional residual capacity (FRC) and ventilation inhomogeneity in the lung. Indirect calculation of nitrogen concentration requires accurate measurement of gas concentrations. To investigate the accuracy of the CO2 concentration and molar mass (MM) values used for the indirect calculation of nitrogen concentration in a commercial MBW device [EasyOne Pro LAB (EOPL), ndd Medizintechnik AG, Switzerland] and its impact on outcomes. We used high-precision gas mixtures to evaluate CO2 and MM sensor output in vivo and in vitro. We developed updated algorithms to correct observed errors and assessed the impact on MBW outcomes and FRC measurement accuracy compared with body plethysmography. The respiratory exchange ratio (RER)-based adjustment of the measured CO2 signal used in the EOPL led to an overestimated CO2 signal (range -0.1% to 1.0%). In addition, an uncorrected dependence on humidity was identified. These combined effects resulted in an overestimation of expired nitrogen concentrations (range -0.7% to 2.6%), and consequently MBW outcomes. Corrected algorithms reduced the mean (SD) cumulative expired volume by 15.8% (9.7%), FRC by 6.6% (3.0%), and lung clearance index by 9.9% (7.6%). Differences in FRC between the EOPL and body plethysmography further increased. Inadequate signal correction causes RER- and humidity-dependent expired nitrogen concentration errors and overestimation of test outcomes. Updated algorithms reduce average signal error, however, RER values far from the population average still cause measurement errors. Despite improved signal accuracy, the updated algorithm increased the difference in FRC between the EOPL and body plethysmography.NEW & NOTEWORTHY We investigated the accuracy of the molar mass (MM) and CO2 sensors of a commercial multiple-breath washout device (ndd Medizintechnik AG, Switzerland). We identified humidity and respiratory exchange ratio-dependent errors that in most measurements resulted in an overestimation of expired nitrogen concentrations, and consequently, MBW results. Functional residual capacity and lung clearance index decreased by 6.6% and 9.9%, respectively. Despite improved signal accuracy, the difference in FRC between the EOPL and body plethysmography increased.
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Affiliation(s)
- Marc-Alexander Oestreich
- Division of Paediatric Respiratory Medicine and Allergology, Department of Paediatrics, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Florian Wyler
- Division of Paediatric Respiratory Medicine and Allergology, Department of Paediatrics, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | | | - Blaise Etter
- Division of Paediatric Respiratory Medicine and Allergology, Department of Paediatrics, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Kathryn A Ramsey
- Division of Paediatric Respiratory Medicine and Allergology, Department of Paediatrics, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Philipp Latzin
- Division of Paediatric Respiratory Medicine and Allergology, Department of Paediatrics, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
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Zwitserloot AM, Verhoog FA, van den Berge M, Gappa M, Oosterom HW, Willemse BWM, Koppelman GH. Comparison of particles in exhaled air and multiple breath washout for assessment of small airway function in children with cystic fibrosis. Pediatr Pulmonol 2024. [PMID: 38179886 DOI: 10.1002/ppul.26847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 12/20/2023] [Accepted: 12/23/2023] [Indexed: 01/06/2024]
Abstract
BACKGROUND The introduction of modulator therapy for cystic fibrosis (CF) has led to an increased interest in the detection of small airway disease (SAD) as sensitive marker of treatment response. The particles in exhaled air (PExA) method, which records exhaled particle mass (PEx ng/L) and number (PExNR), detects SAD in adult patients. Our primary aim was to investigate if PExA outcomes in children with CF are different when compared to controls and associated with more severe disease. Secondary aims were to assess feasibility and repeatability of PExA in children with CF and to correlate PExA to multiple breath nitrogen washout (MBNW) as an established marker of SAD. METHODS Thirteen healthy children (HC), 17 children with CF with normal lung function (CF-N) (FEV1 z-score ≥ -1.64) and six with airway obstruction (CF-AO) (FEV1 z-score < -1.64) between 8 and 18 years performed MBNW followed by PExA and spirometry. Children with CF repeated the measurements after 3 months. RESULTS PEx ng/L and PExNR/L per liter of exhaled breath were similar between the three groups. The lung clearance index (LCI) was significantly higher in both CF-N and CF-AO compared to HC. All participants, except one, were able to perform PExA. Coefficient of variation for PEx ng/l was (median) 0.38, range 0-1.25 and PExNR/l 0.38, 0-1.09. Correlation between LCI and PEx ng/l was low, rs 0.32 (p = .07). CONCLUSION PExA is feasible in children. In contrast to LCI, PExA did not differentiate healthy children from children with CF suggesting it to be a less sensitive tool to detect SAD.
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Affiliation(s)
- Annelies M Zwitserloot
- University of Groningen, University Medical Center Groningen, Beatrix Children's Hospital, Department of Pediatric Pulmonology and Pediatric Allergy, Groningen, The Netherlands
- University of Groningen, University Medical Center Groningen, Groningen Research Institute for Asthma and COPD (GRIAC), Groningen, The Netherlands
| | - Frank A Verhoog
- University of Groningen, University Medical Center Groningen, Beatrix Children's Hospital, Department of Pediatric Pulmonology and Pediatric Allergy, Groningen, The Netherlands
- University of Groningen, University Medical Center Groningen, Groningen Research Institute for Asthma and COPD (GRIAC), Groningen, The Netherlands
| | - Maarten van den Berge
- University of Groningen, University Medical Center Groningen, Groningen Research Institute for Asthma and COPD (GRIAC), Groningen, The Netherlands
- University of Groningen, University Medical Center Groningen, Department of Pulmonary Diseases, Groningen, The Netherlands
| | - Monika Gappa
- Evangelisches Krankenhaus Düsseldorf, Children's Hospital, Düsseldorf, Germany
| | - Helma W Oosterom
- University of Groningen, University Medical Center Groningen, Beatrix Children's Hospital, Department of Pediatric Pulmonology and Pediatric Allergy, Groningen, The Netherlands
- University of Groningen, University Medical Center Groningen, Groningen Research Institute for Asthma and COPD (GRIAC), Groningen, The Netherlands
- University of Groningen, University Medical Center Groningen, Department of Pulmonary Diseases, Groningen, The Netherlands
| | - Brigitte W M Willemse
- University of Groningen, University Medical Center Groningen, Beatrix Children's Hospital, Department of Pediatric Pulmonology and Pediatric Allergy, Groningen, The Netherlands
- University of Groningen, University Medical Center Groningen, Groningen Research Institute for Asthma and COPD (GRIAC), Groningen, The Netherlands
| | - Gerard H Koppelman
- University of Groningen, University Medical Center Groningen, Beatrix Children's Hospital, Department of Pediatric Pulmonology and Pediatric Allergy, Groningen, The Netherlands
- University of Groningen, University Medical Center Groningen, Groningen Research Institute for Asthma and COPD (GRIAC), Groningen, The Netherlands
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Blardone C, Gambazza S, Mariani A, Galgani R, Brivio A, Nobili RM, Rizza C, Tutino AL, Gramegna A, Daccò V, Contarini M, Blasi F, Laquintana D. Perceived burden of respiratory physiotherapy in people with cystic fibrosis taking elexacaftor-tezacaftor-ivacaftor combination: a 1-year observational study. Ther Adv Respir Dis 2024; 18:17534666241235054. [PMID: 38554035 PMCID: PMC10981859 DOI: 10.1177/17534666241235054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 02/08/2024] [Indexed: 04/01/2024] Open
Abstract
BACKGROUND To limit the progression of disease, people with cystic fibrosis (pwCF) perform daily respiratory physiotherapy, which is perceived as the most burdensome routine in managing their condition. The elexacaftor-tezacaftor-ivacaftor (ETI) combination has changed respiratory management. OBJECTIVE To investigate how the perceived treatment burden changed in 1 year of treatment with ETI. DESIGN Prospective observational study. METHODS Ad hoc questionnaires for the pwCF and for the caregivers of pwCF < 18 years were administered before the initiation of ETI therapy and then at 6-12 months. The Cystic Fibrosis Questionnaire-Revised (CFQ-R) and the Sinonasal Outcome Test (SNOT-22) were administered to explore disease-related symptoms and social limitations. The International Physical Activity Questionnaire was used to determine levels of physical activity. Mixed-effect models were fitted to explore whether the time engaged in respiratory physiotherapy changed during 1 year. RESULTS The study included 47/184 pwCF aged 21.4 (5.7) years, who completed 1 year of ETI therapy. At 6 months, time on aerosol therapy was decreased by 2.5 (95% CI -32.9 to 27.8) min/day, time on airway clearance therapies (ACTs) was decreased by 8.8 (95% CI -25.9 to 8.3) min/day, and time for cleaning and disinfecting respiratory equipment was decreased by 10.6 (95% CI -26.5 to 5.3) min/day. At 1 year, gains in time saved were nearly 15 min/day on average. At 1 year, 5/47 (10.6%) pwCF reported that they had discontinued positive expiratory pressure mask. CONCLUSION PwCF on ETI may note less time engaged in their daily respiratory physiotherapy routine. Nonetheless, aerosol therapy, ACTs and maintaining respiratory equipment were still perceived as time-consuming daily activities.
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Affiliation(s)
- Chiara Blardone
- Healthcare Professions Department, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milano, Milan, Italy
| | - Simone Gambazza
- Healthcare Professions Department, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milano, Via Francesco Sforza 35, Milan, Italy
| | - Alessandra Mariani
- Healthcare Professions Department, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milano, Milan, Italy
| | - Rachele Galgani
- Healthcare Professions Department, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milano, Milan, Italy
| | - Anna Brivio
- Healthcare Professions Department, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milano, Milan, Italy
| | - Rita Maria Nobili
- Pediatrics, Gastroenterology, Hepatology, Pediatric Transplantation and Cystic Fibrosis Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milano, Milan, Italy
| | - Carmela Rizza
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - Anna Luisa Tutino
- Pediatrics, Gastroenterology, Hepatology, Pediatric Transplantation and Cystic Fibrosis Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milano, Milan, Italy
| | - Andrea Gramegna
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
- SC Pneumologia e Fibrosi Cistica, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milano, Milan, Italy
| | - Valeria Daccò
- Pediatrics, Gastroenterology, Hepatology, Pediatric Transplantation and Cystic Fibrosis Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milano, Milan, Italy
| | - Martina Contarini
- SC Pneumologia e Fibrosi Cistica, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milano, Milan, Italy
| | - Francesco Blasi
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
- SC Pneumologia e Fibrosi Cistica, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milano, Milan, Italy
| | - Dario Laquintana
- Healthcare Professions Department, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milano, Milan, Italy
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McNally P, Lester K, Stone G, Elnazir B, Williamson M, Cox D, Linnane B, Kirwan L, Rea D, O'Regan P, Semple T, Saunders C, Tiddens HAWM, McKone E, Davies JC. Improvement in Lung Clearance Index and Chest Computed Tomography Scores with Elexacaftor/Tezacaftor/Ivacaftor Treatment in People with Cystic Fibrosis Aged 12 Years and Older - The RECOVER Trial. Am J Respir Crit Care Med 2023; 208:917-929. [PMID: 37703083 DOI: 10.1164/rccm.202308-1317oc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 09/13/2023] [Indexed: 09/14/2023] Open
Abstract
Rationale: Clinical trials have shown that use of elexacaftor/tezacaftor/ivacaftor (ETI) is associated with improvements in sweat chloride, pulmonary function, nutrition, and quality of life in people with cystic fibrosis (CF). Little is known about the impact of ETI on ventilation inhomogeneity and lung structure. Objectives: RECOVER is a real-world study designed to measure the impact of ETI in people with CF. The primary endpoints were lung clearance (lung clearance index; LCI2.5) and FEV1. Secondary endpoints included spirometry-controlled chest computed tomography (CT) scores. Methods: The study was conducted in seven sites in Ireland and the United Kingdom. Participants ages 12 years and older who were homozygous for the F508del mutation (F508del/F508del) or heterozygous for F508del and a minimum-function mutation (F508del/MF) were recruited before starting ETI and were followed up over 12 months. LCI2.5 was measured using nitrogen multiple breath washout (MBW) at baseline and at 6 and 12 months. Spirometry was performed as per the criteria of the American Thoracic Society and the European Respiratory Society. Spirometry-controlled chest CT scans were performed at baseline and at 12 months. CT scans were scored using the Perth Rotterdam Annotated Grid Morphometric Analysis (PRAGMA) system. Other outcome measures include weight, height, Cystic Fibrosis Quality of Life Questionnaire-Revised (CFQ-R), and sweat chloride. Measurements and Main Results: One hundred seventeen people with CF ages 12 and older were recruited to the study. Significant improvements were seen in LCI scores (-2.5; 95% confidence interval [CI], -3.0, -2.0) and in the percents predicted for FEV1 (8.9; 95% CI, 7.0, 10.9), FVC (6.6; 95% CI, 4.9, 8.3), and forced expiratory flow between 25% and 75% of expired volume (12.4; 95% CI, 7.8, 17.0). Overall PRAGMA-CF scores reflecting airway disease improved significantly (-3.46; 95% CI, -5.23, -1.69). Scores for trapped air, mucus plugging, and bronchial wall thickening improved significantly, but bronchiectasis scores did not. Sweat chloride levels decreased in both F508del/F508del (-43.1; 95% CI, -47.4, -38.9) and F508del/MF (-42.8; 95% CI, -48.5, -37.2) groups. Scores on the Respiratory Domain of the CFQ-R improved by 14.2 points (95% CI, 11.3, 17.2). At 1 year, sweat chloride levels were significantly lower for the F508del/F508del group compared with scores for the F508del/MF group (33.93 vs. 53.36, P < 0.001). Conclusions: ETI is associated with substantial improvements in LCI2.5, spirometry, and PRAGMA-CF CT scores in people with CF ages 12 years and older. ETI led to improved nutrition and quality of life. People in the F508del/F508del group had significantly lower sweat chloride on ETI treatment compared with the F508del/MF group. Clinical trial registered with www.clinicaltrials.gov (NCT04602468).
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Affiliation(s)
- Paul McNally
- Department of Pediatrics, RCSI University of Medicine and Health Sciences, Dublin, Ireland
- Children's Health Ireland, Dublin, Ireland
| | - Karen Lester
- Department of Pediatrics, RCSI University of Medicine and Health Sciences, Dublin, Ireland
- Children's Health Ireland, Dublin, Ireland
| | - Gavin Stone
- Department of Pediatrics, RCSI University of Medicine and Health Sciences, Dublin, Ireland
- Children's Health Ireland, Dublin, Ireland
| | | | | | - Des Cox
- Children's Health Ireland, Dublin, Ireland
| | - Barry Linnane
- School of Medicine, University of Limerick, Limerick, Ireland
| | - Laura Kirwan
- Cystic Fibrosis Registry of Ireland, Dublin, Ireland
| | - David Rea
- Children's Health Ireland, Dublin, Ireland
| | - Paul O'Regan
- Cystic Fibrosis Registry of Ireland, Dublin, Ireland
| | - Tom Semple
- Royal Brompton Hospital, London, United Kingdom
| | | | | | - Edward McKone
- St. Vincent's University Hospital, Dublin, Ireland; and
| | - Jane C Davies
- Royal Brompton Hospital, London, United Kingdom
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
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Shmueli E, Bar-On O, Amir B, Mei-Zahav M, Stafler P, Levine H, Steuer G, Rothschild B, Tsviban L, Amitai N, Dotan M, Chodick G, Prais D, Ashkenazi-Hoffnung L. Pulmonary Evaluation in Children with Post-COVID-19 Condition Respiratory Symptoms: A Prospective Cohort Study. J Clin Med 2023; 12:6891. [PMID: 37959356 PMCID: PMC10648595 DOI: 10.3390/jcm12216891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Revised: 10/22/2023] [Accepted: 10/29/2023] [Indexed: 11/15/2023] Open
Abstract
Background: Studies on post-COVID-19 condition (PCC) in adults have shown deterioration in pulmonary function tests (PFTs), mainly a diffusion limitation. Among the pediatric population, data are scarce. Aim: To characterize PFTs in children with PCC, including changes over time. Methods: A prospective longitudinal study of children with defined PCC and respiratory complaints who were referred to a designated multidisciplinary clinic from 11/2020 to 12/2022. Results: Altogether, 184 children with a mean age of 12.4 years (SD 4.06) were included. A mild obstructive pattern was demonstrated in 19/170 (11%) at presentation, as indicated by spirometry and/or positive exercise challenge test and/or reversibility post bronchodilators, only three had a previous diagnosis of asthma. Lung volumes and diffusion were normal in all but one patient (1/134, 0.7%). Exhaled nitric oxide levels were elevated in 32/144 (22%). A total of 33 children who had repeated PFTs had normal or near-normal PFTs on follow-up testing, including seven (21.2%) who had mild obstructive PFTs at presentation. Multivariate analysis identified older age [OR 1.36 (95% CI:1.07-1.75)], specific imaging findings (prominent bronchovascular markings (OR 43.28 (95% CI: 4.50-416.49)), and hyperinflation (OR 28.42, 95% CI: 2.18-370.84)] as significant predictors of an obstructive pattern on PFTs. Conclusions: In children with PCC and respiratory symptoms, the most common impairment was a mild obstructive pattern; most were without a history of asthma. Improvement was witnessed in long-term follow-up. In contrast to the adult population, no diffusion limitation was found. Empirical periodic inhaler therapy may be considered in children with factors associated with PFT abnormalities.
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Affiliation(s)
- Einat Shmueli
- Pulmonology Institute, Schneider Children’s Medical Center of Israel, 14 Kaplan Street, Petach Tikva 49202, Israel; (O.B.-O.); (M.M.-Z.); (P.S.); (H.L.); (G.S.); (B.R.); (L.T.); (N.A.); (M.D.); (D.P.)
- Faculty of Medicine, Tel Aviv University, Tel Aviv 69978, Israel; (B.A.); (G.C.); (L.A.-H.)
| | - Ophir Bar-On
- Pulmonology Institute, Schneider Children’s Medical Center of Israel, 14 Kaplan Street, Petach Tikva 49202, Israel; (O.B.-O.); (M.M.-Z.); (P.S.); (H.L.); (G.S.); (B.R.); (L.T.); (N.A.); (M.D.); (D.P.)
| | - Ben Amir
- Faculty of Medicine, Tel Aviv University, Tel Aviv 69978, Israel; (B.A.); (G.C.); (L.A.-H.)
| | - Meir Mei-Zahav
- Pulmonology Institute, Schneider Children’s Medical Center of Israel, 14 Kaplan Street, Petach Tikva 49202, Israel; (O.B.-O.); (M.M.-Z.); (P.S.); (H.L.); (G.S.); (B.R.); (L.T.); (N.A.); (M.D.); (D.P.)
- Faculty of Medicine, Tel Aviv University, Tel Aviv 69978, Israel; (B.A.); (G.C.); (L.A.-H.)
| | - Patrick Stafler
- Pulmonology Institute, Schneider Children’s Medical Center of Israel, 14 Kaplan Street, Petach Tikva 49202, Israel; (O.B.-O.); (M.M.-Z.); (P.S.); (H.L.); (G.S.); (B.R.); (L.T.); (N.A.); (M.D.); (D.P.)
- Faculty of Medicine, Tel Aviv University, Tel Aviv 69978, Israel; (B.A.); (G.C.); (L.A.-H.)
| | - Hagit Levine
- Pulmonology Institute, Schneider Children’s Medical Center of Israel, 14 Kaplan Street, Petach Tikva 49202, Israel; (O.B.-O.); (M.M.-Z.); (P.S.); (H.L.); (G.S.); (B.R.); (L.T.); (N.A.); (M.D.); (D.P.)
- Faculty of Medicine, Tel Aviv University, Tel Aviv 69978, Israel; (B.A.); (G.C.); (L.A.-H.)
| | - Guy Steuer
- Pulmonology Institute, Schneider Children’s Medical Center of Israel, 14 Kaplan Street, Petach Tikva 49202, Israel; (O.B.-O.); (M.M.-Z.); (P.S.); (H.L.); (G.S.); (B.R.); (L.T.); (N.A.); (M.D.); (D.P.)
| | - Benjamin Rothschild
- Pulmonology Institute, Schneider Children’s Medical Center of Israel, 14 Kaplan Street, Petach Tikva 49202, Israel; (O.B.-O.); (M.M.-Z.); (P.S.); (H.L.); (G.S.); (B.R.); (L.T.); (N.A.); (M.D.); (D.P.)
| | - Lior Tsviban
- Pulmonology Institute, Schneider Children’s Medical Center of Israel, 14 Kaplan Street, Petach Tikva 49202, Israel; (O.B.-O.); (M.M.-Z.); (P.S.); (H.L.); (G.S.); (B.R.); (L.T.); (N.A.); (M.D.); (D.P.)
| | - Nofar Amitai
- Pulmonology Institute, Schneider Children’s Medical Center of Israel, 14 Kaplan Street, Petach Tikva 49202, Israel; (O.B.-O.); (M.M.-Z.); (P.S.); (H.L.); (G.S.); (B.R.); (L.T.); (N.A.); (M.D.); (D.P.)
- Faculty of Medicine, Tel Aviv University, Tel Aviv 69978, Israel; (B.A.); (G.C.); (L.A.-H.)
| | - Miri Dotan
- Pulmonology Institute, Schneider Children’s Medical Center of Israel, 14 Kaplan Street, Petach Tikva 49202, Israel; (O.B.-O.); (M.M.-Z.); (P.S.); (H.L.); (G.S.); (B.R.); (L.T.); (N.A.); (M.D.); (D.P.)
- Faculty of Medicine, Tel Aviv University, Tel Aviv 69978, Israel; (B.A.); (G.C.); (L.A.-H.)
| | - Gabriel Chodick
- Faculty of Medicine, Tel Aviv University, Tel Aviv 69978, Israel; (B.A.); (G.C.); (L.A.-H.)
| | - Dario Prais
- Pulmonology Institute, Schneider Children’s Medical Center of Israel, 14 Kaplan Street, Petach Tikva 49202, Israel; (O.B.-O.); (M.M.-Z.); (P.S.); (H.L.); (G.S.); (B.R.); (L.T.); (N.A.); (M.D.); (D.P.)
- Faculty of Medicine, Tel Aviv University, Tel Aviv 69978, Israel; (B.A.); (G.C.); (L.A.-H.)
| | - Liat Ashkenazi-Hoffnung
- Faculty of Medicine, Tel Aviv University, Tel Aviv 69978, Israel; (B.A.); (G.C.); (L.A.-H.)
- Department of Day Hospitalization, Schneider Children’s Medical Center of Israel, Petach Tikva 49202, Israel
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Alam FS, Zanette B, Munidasa S, Braganza S, Li D, Woods JC, Ratjen F, Santyr G. Intra- and Inter-visit Repeatability of 129 Xenon Multiple-Breath Washout MRI in Children With Stable Cystic Fibrosis Lung Disease. J Magn Reson Imaging 2023; 58:936-948. [PMID: 36786650 DOI: 10.1002/jmri.28638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 01/25/2023] [Accepted: 01/26/2023] [Indexed: 02/15/2023] Open
Abstract
BACKGROUND Multiple-breath washout (MBW) 129 Xe MRI (MBW Xe-MRI) is a promising technique for following pediatric cystic fibrosis (CF) lung disease progression. However, its repeatability in stable CF needs to be established to use it as an outcome measure for novel therapies. PURPOSE To assess intravisit and intervisit repeatability of MBW Xe-MRI in healthy and CF children. STUDY TYPE Prospective, longitudinal cohort study. SUBJECTS A total of 18 pediatric subjects (7 healthy, 11 CF). FIELD STRENGTH/SEQUENCE A 3 T/2D coronal hyperpolarized (HP) 129 Xe images using GRE sequence. ASSESSMENT All subjects completed MBW Xe-MRI, pulmonary function tests (PFTs) (spirometry, nitrogen [N2 ] MBW for lung clearance index [LCI]) and ventilation defect percent (VDP) at baseline (visit 1) and 1-month after. Fractional ventilation (FV), coefficient of variation (CoVFV ) maps were calculated from MBW Xe-MRI data acquired between intervening air washout breaths performed after an initial xenon breath-hold. Skewness of FV and CoVFV map distributions was also assessed. STATISTICAL TESTS Repeatability: intraclass correlation coefficients (ICC), within-subject coefficient of variation (CV%), repeatability coefficient (CR). Agreement: Bland-Altman. For correlations between MBW Xe-MRI, VDP and PFTs: Spearman's correlation. Significance threshold: P < 0.05. RESULTS For FV, intravisit median [IQR] ICC was high in both healthy (0.94 [0.48, 0.99]) and CF (0.83 [0.04, 0.97]) subjects. CoVFV also had good intravisit ICC in healthy (0.92 [0.42, 0.99]) and CF (0.79 [0.02, 0.96]) subjects. Similarly, for FV, intervisit ICC was high in health (0.94 [0.68, 0.99]) and CF (0.89 [0.61, 0.97]). CoVFV also had good intervisit ICC in health (0.92 [0.42, 0.99]) and CF (0.78 [0.26, 0.94]). FV had better intervisit repeatability than VDP. CoVFV correlated significantly with LCI (R = 0.56). Skewness of FV distributions significantly distinguished between cohorts at baseline. DATA CONCLUSION MBW Xe-MRI had high intravisit and intervisit repeatability in healthy and stable CF subjects. CoVFV correlated with LCI, suggesting the importance of ventilation heterogeneity to early CF. EVIDENCE LEVEL 1. TECHNICAL EFFICACY Stage 2.
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Affiliation(s)
- Faiyza S Alam
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
- Translational Medicine Program, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Brandon Zanette
- Translational Medicine Program, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Samal Munidasa
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
- Translational Medicine Program, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Sharon Braganza
- Translational Medicine Program, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Daniel Li
- Translational Medicine Program, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Jason C Woods
- Center for Pulmonary Imaging Research, Cincinnati Children's Hospital, Cincinnati, Ohio, USA
| | - Felix Ratjen
- Translational Medicine Program, The Hospital for Sick Children, Toronto, Ontario, Canada
- Division of Respirology, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Giles Santyr
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
- Translational Medicine Program, The Hospital for Sick Children, Toronto, Ontario, Canada
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8
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Walicka-Serzysko K, Postek M, Borawska-Kowalczyk U, Milczewska J, Sands D. Pulmonary Function Tests in the Evaluation of Early Lung Disease in Cystic Fibrosis. J Clin Med 2023; 12:4735. [PMID: 37510850 PMCID: PMC10380830 DOI: 10.3390/jcm12144735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Revised: 07/10/2023] [Accepted: 07/14/2023] [Indexed: 07/30/2023] Open
Abstract
BACKGROUND Properly evaluating respiratory system dysfunction is essential in children with cystic fibrosis (CF). This prospective study aimed to assess the course of early lung disease based on multiple breath nitrogen washout (MBNW), impulse oscillometry (IOS), and conventional techniques, such as spirometry and body plethysmography. METHODS Over a 2 year recruitment period, subjects with CF aged 7-18 performed pulmonary function tests (PFTs). Moreover, the nutritional and microbiological status, frequency of pulmonary exacerbations (PExs), and patients' health-related quality of life (HRQoL) were assessed. RESULTS The mean age of the children (n = 69) was 14.09 ± 3.26 years; F/M 37/32. Spirometry-based diagnoses of normal lung function (forced expiratory volume in 1 s, FEV1 ≥ 90%pred), mild (FEV1 70-89%pred) and moderate (FEV1 40-69%pred) lung diseases were established in 34 (49.3%), 25 (36.2%), and 10 (14.5%) patients, respectively. An elevated lung clearance index (LCI > 6.98) was observed in 85% of the subjects with normal FEV1. The presence of Pseudomonas aeruginosa infection (n = 16) and the number of PExs treated with IV antibiotics were associated with significantly worse PFT results. CONCLUSIONS MBNW and IOS are more helpful tools than conventional techniques in assessing early lung disease in CF. LCI is a more useful parameter for detecting functional abnormalities than FEV1 in school-age children.
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Affiliation(s)
- Katarzyna Walicka-Serzysko
- Cystic Fibrosis Department, Institute of Mother and Child, 01-211 Warsaw, Poland
- Cystic Fibrosis Centre, Paediatric Hospital, Dziekanow Lesny, 05-092 Łomianki, Poland
| | - Magdalena Postek
- Cystic Fibrosis Department, Institute of Mother and Child, 01-211 Warsaw, Poland
- Cystic Fibrosis Centre, Paediatric Hospital, Dziekanow Lesny, 05-092 Łomianki, Poland
| | - Urszula Borawska-Kowalczyk
- Cystic Fibrosis Department, Institute of Mother and Child, 01-211 Warsaw, Poland
- Cystic Fibrosis Centre, Paediatric Hospital, Dziekanow Lesny, 05-092 Łomianki, Poland
| | - Justyna Milczewska
- Cystic Fibrosis Department, Institute of Mother and Child, 01-211 Warsaw, Poland
- Cystic Fibrosis Centre, Paediatric Hospital, Dziekanow Lesny, 05-092 Łomianki, Poland
| | - Dorota Sands
- Cystic Fibrosis Department, Institute of Mother and Child, 01-211 Warsaw, Poland
- Cystic Fibrosis Centre, Paediatric Hospital, Dziekanow Lesny, 05-092 Łomianki, Poland
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9
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De Queiroz Andrade E, Bailey B, Davies JC, Jensen R, Ratjen F, Saunders CJ, Short C, Robinson PD. Reply to migration is not the perfect answer: Optimized methodology to assess LCI agreement between corrected legacy multiple breath nitrogen washout data and that directly collected on updated software. Pediatr Pulmonol 2023. [PMID: 37133200 DOI: 10.1002/ppul.26430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Accepted: 04/06/2023] [Indexed: 05/04/2023]
Affiliation(s)
- Ediane De Queiroz Andrade
- Department of Respiratory Medicine, The Children's Hospital at Westmead, Sydney, New South Wales, Australia
- Australian Multiple Breath Washout Central Over-Reading Centre, Sydney, New South Wales, Australia
| | - Brooke Bailey
- Department of Respiratory Medicine, The Children's Hospital at Westmead, Sydney, New South Wales, Australia
| | - Jane C Davies
- Royal Brompton and Harefield Hospitals, Guys and St Thomas' Trust, London, UK
- National Heart and Lung Institute, Imperial College London, London, UK
- European Cystic Fibrosis Society Lung Clearance Index Core Facility, London, UK
| | - Renee Jensen
- Translational Medicine, Hospital for Sick Children, Toronto, Ontario, Canada
- Division of Respiratory Medicine, Hospital for Sick Children, Toronto, Ontario, Canada
- Cystic Fibrosis Foundation Multiple Breath Washout National Resource Centre, Toronto, Ontario, Canada
| | - Felix Ratjen
- Translational Medicine, Hospital for Sick Children, Toronto, Ontario, Canada
- Division of Respiratory Medicine, Hospital for Sick Children, Toronto, Ontario, Canada
- Cystic Fibrosis Foundation Multiple Breath Washout National Resource Centre, Toronto, Ontario, Canada
- University of Toronto, Toronto, Ontario, Canada
| | - Clare J Saunders
- Royal Brompton and Harefield Hospitals, Guys and St Thomas' Trust, London, UK
- National Heart and Lung Institute, Imperial College London, London, UK
- European Cystic Fibrosis Society Lung Clearance Index Core Facility, London, UK
| | - Christopher Short
- Royal Brompton and Harefield Hospitals, Guys and St Thomas' Trust, London, UK
- National Heart and Lung Institute, Imperial College London, London, UK
- European Cystic Fibrosis Society Lung Clearance Index Core Facility, London, UK
| | - Paul D Robinson
- Department of Respiratory Medicine, The Children's Hospital at Westmead, Sydney, New South Wales, Australia
- Australian Multiple Breath Washout Central Over-Reading Centre, Sydney, New South Wales, Australia
- Discipline of Paediatrics and Child Health, University of Sydney, Sydney, New South Wales, Australia
- Airway Physiology and Imaging group, Woolcock Medical Research Institute, Sydney, New South Wales, Australia
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10
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Sandvik RM, Lindblad A, Robinson PD, Nielsen KG, Gustafsson P. Turning lung clearance index on its head. Reference data for SF 6 multiple-breath washout derived ventilation distribution efficiency. J Appl Physiol (1985) 2023; 134:316-327. [PMID: 36548514 DOI: 10.1152/japplphysiol.00541.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 11/16/2022] [Accepted: 12/08/2022] [Indexed: 12/24/2022] Open
Abstract
Cystic fibrosis (CF) lung disease is characterized by increased ventilation inhomogeneity (VI), as measured by multiple-breath washout (MBW). Lung clearance index (LCI) is the most reported VI outcome. This study aimed to evaluate historically published reference equations for sulfur hexafluoride (SF6) MBW outcomes, to data collected using updated commercial SF6MBW equipment, and to produce device-specific equations if necessary. SF6MBW was performed in 327 healthy children aged 0.1-18.4 yr [151 (46%) girls], 191 (58.4%) <3 yr. z-Scores were calculated from published reference equations (FRC and LCI) and multivariate linear regression was performed to produce device-specific reference equations. Due to increasing residual standard deviations with increasing LCI values, investigation of methods for improvement were investigated, based on the relationship between VI and dead space ventilation (VD/VT; dead space volume/tidal volume) in a cohort of 59 healthy children, 26 children with CF (n = 138 test occasions), and 49 adults with lung disease. Historical SF6MBW reference equations were unsuitable for EXHALYZER D data. In contrast to LCI and log10(LCI), 1/LCI (ventilation distribution efficiency; VDE) was linearly related to VD/VT, with z-scores linearly related to its absolute values. Reference equations were reported for VDE and log10(FRC). Significant predictors for VDE and log10(FRC), respectively, were log10(age) and sex, and log10(height), sex, and posture. VDE is potentially a better index of VI than LCI, particularly in more advanced CF lung disease and also for longitudinal monitoring. Further confirmatory clinical studies, particularly longitudinal imaging studies of structural or ventilatory changes, are warranted.NEW & NOTEWORTHY Lung clearance index (LCI) is the most used outcome from the multiple-breath washout test. As known for decades, the LCI is not linearly related to dead space ventilation, giving difficulties interpreting changes over time and in clinical trials. We present a new and improved outcome based on LCI, the ventilation distribution efficiency (VDE), which solves this problem by being linearly related to dead space ventilation. A pediatric age range reference equation for VDE is presented.
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Affiliation(s)
- Rikke Mulvad Sandvik
- Department of Paediatric and Adolescent Medicine, CF Centre Copenhagen, Danish Paediatric Pulmonary Service, Copenhagen University Hospital, Copenhagen, Denmark
| | - Anders Lindblad
- Department of Pediatrics, Queen Silvia Children's Hospital, West Sweden CF Center, Gothenburg, Sweden
- The Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden
| | - Paul D Robinson
- Department of Respiratory Medicine, The Children's Hospital at Westmead, Sydney, New South Wales, Australia
- The Discipline of Paediatrics and Child Health, The University of Sydney, Sydney, New South Wales, Australia
- Airway Physiology and Imaging Group, The Woolcock Medical Research Institute, Sydney, New South Wales, Australia
| | - Kim G Nielsen
- Department of Paediatric and Adolescent Medicine, CF Centre Copenhagen, Danish Paediatric Pulmonary Service, Copenhagen University Hospital, Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Per Gustafsson
- The Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden
- Department of Pediatrics, General Hospital, Skövde, Sweden
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11
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Ullah SE, Zahoor MM, Gupta S, Boparai S, Muneeb M, Eltieb SA, Shankar A, Kidiavai HM, Vohra RR, Devi A, Bhura ZA, Aslam ZM, Shoaib M. Efficacy of hypertonic saline versus isotonic saline among children with cystic fibrosis: A systematic review and meta-analysis. Can J Respir Ther 2023; 59:1-7. [PMID: 36711047 PMCID: PMC9838740 DOI: 10.29390/cjrt-2022-046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Background Inhaled hypertonic saline (HS) reduces pulmonary exacerbations in patients with cystic fibrosis (CF) aged 6 or more years. However, the effectiveness of HS in improving clinical outcomes in younger children aged 6 or less years is not established. This study examines the efficacy of HS in younger CF patients. Methods Searches were conducted across three databases (Medline, Cochrane Central and EMBASE) from inception through July 2022. Randomized controlled trials assessing the impact of HS in younger CF patients were included. Trials involving only patients greater than 6 years or control group other than isotonic saline (IS) were excluded. Outcomes measured included lung clearance index (LCI), cystic fibrosis questionnaire (CFQ-R) score, spirometry measures, oxygen saturation, respiratory rate, height and weight. Outcomes were reported as mean differences (MDs) with 95% confidence intervals. Results Seven studies (n = 390 patients) were included in this review. HS significantly reduced the LCI (MD: -0.67; 95%CI, -1.05 to 0.29, P = 0.0006) compared to IS. In addition, HS was associated with significant improvements in height (MD: 2.23; 95%CI, -0.00 to 4.46, P = 0.05) and CFQ-R (MD: 4.30; 95%CI, 0.65-7.95, P = 0.02), but not in oxygen saturation (MD: -0.15; 95%CI, -0.54 to 0.25, P = 0.47), respiratory rate (MD: -0.21; 95%CI, -2.19 to 1.77, P = 0.83) or weight (MD: 0.70; 95%CI, -0.47 to 1.87, P = 0.24). Furthermore, HS did not significantly improve spirometry measures, including FEV1 (MD: -0.11; 95%CI, -0.21 to 0.43, P = 0.51) and forced vital capacity (MD: 0.27; 95%CI, -0.49 to 1.04, P = 0.48), but significantly improved FEF25-75 (MD: 0.12; 95% CI, 0.05-0.20; P = 0.002). Discussion Treatment with HS in younger children with CF improves lung clearance, symptoms and quality of life. FEF25-75 may prove a more sensitive measure for assessing intervention related improvements in pediatric CF trials. Conclusion The findings support HS as a therapeutic method in CF-affected children.
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Affiliation(s)
| | | | - Swatika Gupta
- Department of Medicine, Mahatma Gandhi Mission College and Hospital, Navi Mumbai, India
| | - Sukhman Boparai
- Department of Medicine, Acharya Shri Chander College of Medical Sciences and Hospital, Jammu, India
| | - Muhammad Muneeb
- Department of Medicine, Ziauddin University, Karachi, Pakistan
| | | | - Abhirami Shankar
- Department of Internal Medicine, West Anaheim Medical Center, Anaheim, CA
| | | | - Rimsha Rahim Vohra
- Department of Medicine, Dow University of Health Sciences, Karachi, Pakistan
| | - Anjuli Devi
- Department of Medicine, Ziauddin University, Karachi, Pakistan
| | - Zainab Asif Bhura
- Department of Internal Medicine, University Health Network, Toronto, ON
| | | | - Mudassir Shoaib
- Department of Medicine, Jinnah Medical and Dental College, Karachi, Pakistan
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12
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Terlizzi V, Parisi GF, Ferrari B, Castellani C, Manti S, Leonardi S, Taccetti G. Effect of Dornase Alfa on the Lung Clearance Index in Children with Cystic Fibrosis: A Lesson from a Case Series. Children (Basel) 2022; 9:1625. [PMID: 36360353 PMCID: PMC9688561 DOI: 10.3390/children9111625] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 10/15/2022] [Accepted: 10/24/2022] [Indexed: 09/12/2023]
Abstract
BACKGROUND Dornase alfa (DNase) is the only mucus-degrading agent that has proven efficacy in cystic fibrosis (CF). Few studies have evaluated the effects of DNase on the lung clearance index (LCI). We report the experience of two CF centers in which LCI monitoring was used to evaluate the efficacy of DNase therapy. METHODS This is a prospective and observational study, evaluating the effects of DNase therapy on LCI values in three CF children followed at CF centers in Florence and Catania, Italy. In both centers, LCI was performed routinely, every 3-6 months, based on the clinical picture and severity of the lung disease. In this study, we evaluated the LCI before and after long-term DNase therapy. RESULTS DNase improved LCI values in the absence of respiratory exacerbations: in case n. 1 LCI decreased by 39% in 16 months (from 11.1 to 6.8); in case n. 2 by 20% in 12 months (from 9.3 to 7.4); in case n. 3 by 24% in 16 months (from 9.3 to 7.0). CONCLUSIONS This case series confirms the efficacy of DNase therapy in CF children, as demonstrated by the LCI reduction in treated patients. Furthermore, our results suggest that LCI is a sensitive marker of disease and can be used for the evaluation of response to treatment.
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Affiliation(s)
- Vito Terlizzi
- Cystic Fibrosis Regional Reference Center, Department of Paediatric Medicine, Meyer Children’s Hospital, 50139 Florence, Italy
| | - Giuseppe Fabio Parisi
- Pediatric Respiratory and Cystic Fibrosis Unit, Department of Clinical and Experimental Medicine, San Marco Hospital, University of Catania, 95121 Catania, Italy
| | - Beatrice Ferrari
- Rehabilitation Unit, Meyer Children’s Hospital, 50139 Florence, Italy
| | - Chiara Castellani
- Rehabilitation Unit, Meyer Children’s Hospital, 50139 Florence, Italy
| | - Sara Manti
- Pediatric Respiratory and Cystic Fibrosis Unit, Department of Clinical and Experimental Medicine, San Marco Hospital, University of Catania, 95121 Catania, Italy
- Pediatric Unit, Department of Human and Pediatric Pathology “Gaetano Barresi”, AOUP G. Martino, University of Messina, Via Consolare Valeria, 1, 98124 Messina, Italy
| | - Salvatore Leonardi
- Pediatric Respiratory and Cystic Fibrosis Unit, Department of Clinical and Experimental Medicine, San Marco Hospital, University of Catania, 95121 Catania, Italy
| | - Giovanni Taccetti
- Cystic Fibrosis Regional Reference Center, Department of Paediatric Medicine, Meyer Children’s Hospital, 50139 Florence, Italy
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13
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Svedberg M, Imberg H, Gustafsson P, Brink M, Caisander H, Lindblad A. Chest X-rays are less sensitive than multiple breath washout examinations when it comes to detecting early cystic fibrosis lung disease. Acta Paediatr 2022; 111:1253-1260. [PMID: 35181935 PMCID: PMC9306859 DOI: 10.1111/apa.16302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 02/15/2022] [Accepted: 02/16/2022] [Indexed: 11/30/2022]
Abstract
AIM Annual chest X-ray is recommended as routine surveillance to track cystic fibrosis (CF) lung disease. The aim of this study was to investigate the clinical utility of chest X-rays to track CF lung disease. METHODS Children at Gothenburg's CF centre who underwent chest X-rays, multiple breath washouts and chest computed tomography examinations between 1996 and 2016 were included in the study. Chest X-rays were interpreted with Northern Score (NS). We compared NS to lung clearance index (LCI) and structural lung damage measured by computed tomography using a logistic regression model. RESULTS A total of 75 children were included over a median period of 13 years (range: 3.0-18.0 years). The proportion of children with abnormal NS was significantly lower than the proportion of abnormal LCI up to the age of 4 years (p < 0.05). A normal NS and a normal LCI at age 6 years were associated with a median (10-90th percentile) total airway disease of 1.8% (0.4-4.7%) and bronchiectasis of 0.2% (0.0-1.5%). CONCLUSION Chest X-rays were less sensitive than multiple breath washout examinations to detect early CF lung disease. The combined results from both methods can be used as an indicator to perform chest computed tomography less frequently.
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Affiliation(s)
- Marcus Svedberg
- Department of Pediatrics Institute of Clinical Science at The Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
- Department of Pediatrics Queen Silvia's Children Hospital Gothenburg Sweden
| | - Henrik Imberg
- Department of Mathematical Sciences Chalmers University of Technology and University of Gothenburg Gothenburg Sweden
- Statistiska Konsultgruppen Gothenburg Sweden
| | - Per Gustafsson
- Department of Pediatrics Institute of Clinical Science at The Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
- Department of Pediatrics Central Hospital Skoevde Sweden
| | - Mela Brink
- Department of Pediatric Radiology Queen Silvia's Children Hospital Gothenburg Sweden
| | - Håkan Caisander
- Department of Pediatric Radiology Queen Silvia's Children Hospital Gothenburg Sweden
| | - Anders Lindblad
- Department of Pediatrics Institute of Clinical Science at The Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
- Department of Pediatrics Queen Silvia's Children Hospital Gothenburg Sweden
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14
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Darquenne C, Theilmann RJ, Fine JM, Verbanck SAB. Nitrogen-based lung clearance index: a valid physiological biomarker for the clinic. J Appl Physiol (1985) 2022; 132:1290-1296. [PMID: 35446597 PMCID: PMC9126222 DOI: 10.1152/japplphysiol.00511.2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Multiple breath washout (MBW) testing is increasingly used as a physiological measurement in the clinic, due in part to the availability of commercial equipment and reference values for MBW indices. Commercial N2 washout devices are usually based on indirect measurement of N2 concentration (CN2), by directly measuring either molar mass and O2 and CO2, or molar mass and CO2. We aim to elucidate the role of two potential pitfalls associated with N2-MBW testing that could override its physiological content: indirect N2 measurement and blood-solubility of N2. We performed MBW in 12 healthy adult subjects using a commercial device (MBWindirect) with simultaneous direct gas concentration measurements by mass spectrometry (MBWdirect) and compared CN2 between MBWdirect and MBWindirect. We also measured argon concentration during the same washouts to verify the maximal effect gas solubility can have on N2-based functional residual capacity (FRC) and lung clearance index (LCI). Continuous N2 concentration traces were very similar for MBWindirect and MBWdirect, resulting in comparable breath-by-breath washout plots of expired concentration and in no significant differences in FRCN2, LCIN2, Scond, and Sacin between the two methods. Argon washouts were slightly slower than N2 washouts, as expected for a less diffusive and more soluble gas. Finally, comparison between LCIN2 and LCIAr indicates that the maximum impact from blood-tissue represents less than half a LCI unit in normal subjects. In conclusion, we have demonstrated by direct measurement of N2 and twice as soluble argon, that indirect N2 measurement can be safely used as a meaningful physiological measurement.NEW & NOTEWORTHY The physiological content of N2 multibreath washout testing has been questioned due to N2 indirect measurement accuracy and N2 blood solubility. With direct measurement of N2 and twice as soluble argon, we show that these effects are largely outweighed by ease of use.
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Affiliation(s)
- Chantal Darquenne
- Department of Medicine, University of California, San Diego, California
| | | | - Janelle M Fine
- Department of Medicine, University of California, San Diego, California
| | - Sylvia A B Verbanck
- Respiratory Division, Vrije Universiteit Brussel (VUB), Universitair Ziekenhuis Brussel (UZ Brussel), Brussels, Belgium
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15
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Sandvik RM, Gustafsson PM, Lindblad A, Buchvald F, Olesen HV, Olsen JH, Skov M, Schmidt MN, Thellefsen MR, Robinson PD, Rubak S, Pressler T, Nielsen KG. Contemporary N 2 and SF 6 multiple breath washout in infants and toddlers with cystic fibrosis. Pediatr Pulmonol 2022; 57:945-955. [PMID: 35029068 DOI: 10.1002/ppul.25830] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 12/20/2021] [Accepted: 01/12/2022] [Indexed: 11/10/2022]
Abstract
INTRODUCTION Multiple breath washout (MBW) is used for early detection of cystic fibrosis (CF) lung disease, with SF6 MBW commonly viewed as the reference method. The use of N2 MBW in infants and toddlers has been questioned for technical and physiological reasons, but a new correction of the N2 signal has minimized the technical part. The present study aimed to assess the remaining differences and the contributing mechanisms for the differences between SF6 and N2 MBW,corrected-such as tidal volume reduction during N2 washout with pure O2 . METHOD This was a longitudinal multicenter cohort study. SF6 MBW and N2 MBW were performed prospectively at three CF centers in the same visits on 154 test occasions across 62 children with CF (mean age: 22.7 months). Offline analysis using identical algorithms to the commercially available program provided outcomes of N2,original and N2,corrected for comparison with SF6 MBW. RESULTS Mean functional residual capacity, FRCN2,corrected was 14.3% lower than FRCN2, original , and 1.0% different from FRCSF6 . Lung clearance index, LCIN2,corrected was 25.2% lower than LCIN2,original , and 7.3% higher than LCISF6 . Mean (SD) tidal volume decreased significantly during N2 MBWcorrected , compared to SF6 MBW (-13.1 ml [-30.7; 4.6], p < 0.0001, equal to -12.0% [-25.7; 1.73]), but this tidal volume reduction did not correlate to the differences between LCIN2,corrected and LCISF6 . The absolute differences in LCI increased significantly with higher LCISF6 (0.63/LCISF6 ) and (0.23/LCISF6 ), respectively, for N2,original and N2,corrected , but the relative differences were stable across disease severity for N2,corrected , but not for N2,original . CONCLUSION Only minor residual differences between FRCN2,corrected and FRCSF6 remained to show that the two methods measure gas volumes very similar in this age range. Small differences in LCI were found. Tidal volume reduction during N2 MBW did not affect differences. The corrected N2 MBW can now be used with confidence in young children with CF, although not interchangeably with SF6 .
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Affiliation(s)
- Rikke M Sandvik
- Danish Paediatric Pulmonary Service, CF Centre Copenhagen, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Per M Gustafsson
- Department of Paediatrics, Central Hospital, Skövde, Sweden.,Institute of Clinical Science, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Anders Lindblad
- Institute of Clinical Science, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,Department of Pediatrics, CF Center, Queen Silvia Children's Hospital, Gothenburg, Sweden
| | - Frederik Buchvald
- Danish Paediatric Pulmonary Service, CF Centre Copenhagen, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Hanne V Olesen
- Department of Paediatrics and Adolescent Medicine, Danish Center of Pediatric Pulmonology and Allergology, Cystic Fibrosis Centre Aarhus, Aarhus University Hospital, Aarhus, Denmark
| | - Jørgen H Olsen
- Department of Paediatrics and Adolescent Medicine, Danish Center of Pediatric Pulmonology and Allergology, Cystic Fibrosis Centre Aarhus, Aarhus University Hospital, Aarhus, Denmark
| | - Marianne Skov
- Danish Paediatric Pulmonary Service, CF Centre Copenhagen, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Marika N Schmidt
- Danish Paediatric Pulmonary Service, CF Centre Copenhagen, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Mette R Thellefsen
- Danish Paediatric Pulmonary Service, CF Centre Copenhagen, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Paul D Robinson
- Department of Respiratory Medicine, The Children's Hospital at Westmead, Sydney, New South Wales, Australia
| | - Sune Rubak
- Department of Paediatrics and Adolescent Medicine, Danish Center of Pediatric Pulmonology and Allergology, Cystic Fibrosis Centre Aarhus, Aarhus University Hospital, Aarhus, Denmark
| | - Tacjana Pressler
- Danish Paediatric Pulmonary Service, CF Centre Copenhagen, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Kim G Nielsen
- Danish Paediatric Pulmonary Service, CF Centre Copenhagen, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark.,Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
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16
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Secchi T, Baselli LA, Russo MC, Borzani IM, Carta F, Lopopolo MA, Foà M, La Vecchia A, Agostoni C, Agosti M, Dellepiane RM. Multiple Breath Washout for Early Assessment of Pulmonary Complications in Patients With Primary Antibody Deficiencies: An Observational Study in Pediatric Age. Front Pediatr 2022; 10:773751. [PMID: 35656375 PMCID: PMC9152221 DOI: 10.3389/fped.2022.773751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 04/01/2022] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND In primary antibody deficiencies (PADs), pulmonary complications are the main cause of morbidity, despite immunoglobulin substitutive therapy, antibiotic treatment of exacerbations, and respiratory physiotherapy. Current Italian recommendations for surveillance of PADs respiratory complications include an annual assessment of spirometry and execution of chest high-resolution computed tomography (HRCT) every 4 years. OBJECTIVE This study aimed to evaluate the effectiveness of the lung clearance index (LCI) as an early marker of lung damage in patients with PADs. LCI is measured by multiple breath washout (MBW), a non-invasive and highly specific test widely used in patients with cystic fibrosis (CF). METHODS Pediatric patients with PADs (n = 17, 10 male, 7 female, and age range 5-15 years) underwent baseline assessment of lung involvement with chest HRCT, spirometry, and multiple breath nitrogen washout. Among them, 13 patients were followed up to repeat HRCT after 4 years, while performing pulmonary function tests annually. Their baseline and follow-up LCI and forced expiratory volume at 1 s (FEV1) values were compared, taking HRCT as the gold standard, using logistic regression analysis. RESULTS Lung clearance index [odds ratio (OR) 2.3 (confidence interval (CI) 0.1-52) at baseline, OR 3.9 (CI 0.2-191) at follow-up] has a stronger discriminating power between altered and normal HRCT rather than FEV1 [OR 0.6 (CI 0.2-2) at baseline, OR 1.6 (CI 0.1-13.6) at follow-up]. CONCLUSION Within the context of a limited sample size, LCI seems to be more predictive of HRCT alterations than FEV1 and more sensitive than HRCT in detecting non-uniform ventilation in the absence of bronchiectasis. A study of a larger cohort of pediatric patients followed longitudinally in adulthood is needed to challenge these findings.
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Affiliation(s)
| | - Lucia Augusta Baselli
- Pediatric Intermediate Care Unit, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Maria Chiara Russo
- Cystic Fibrosis Regional Reference Centre, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Irene Maria Borzani
- Radiology Unit-Pediatric Division, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Federica Carta
- Cystic Fibrosis Regional Reference Centre, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Maria Amalia Lopopolo
- Pediatric Rehabilitation Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Michaela Foà
- Pediatric Rehabilitation Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | | | - Carlo Agostoni
- Pediatric Intermediate Care Unit, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Milan, Italy.,Department of Clinical Sciences and Community Health (DISCCO), University of Milan, Milan, Italy
| | - Massimo Agosti
- Woman and Child Department, Ospedale "Filippo Del Ponte," University of Insubria, Varese, Italy
| | - Rosa Maria Dellepiane
- Pediatric Intermediate Care Unit, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Milan, Italy
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17
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Safavi S, Dai R, Breton VL, Emmerson MN, Kowalik K, Lu Z, Lou W, Dubeau A, DeLorenzo S, Azad MB, Becker AB, Mandhane PJ, Turvey SE, Gustafsson P, Lefebvre DL, Sears MR, Moraes TJ, Subbarao P. Lung clearance index predicts persistence of preschool wheeze. Pediatr Allergy Immunol 2022; 33:e13713. [PMID: 34875116 DOI: 10.1111/pai.13713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 11/26/2021] [Accepted: 11/30/2021] [Indexed: 11/27/2022]
Abstract
BACKGROUND The lung clearance index (LCI) is a measure of pulmonary function. Variable feasibility (50->80%) in preschool children has been reported. There are limited studies exploring its relationship to respiratory symptoms and how it predicts persistent wheeze. We aimed to assess the association with respiratory symptoms in preschool-aged children with LCI and determine its utility in predicting persistent wheeze. METHODS LCI was measured in a subcohort of the CHILD Cohort Study at age 3 years using SF6 multiple breath washout test mass spectrometry. Respiratory symptom phenotypes at age 3 were derived from children's respiratory symptoms reported by their parents. Responses were used to categorize children into 4 symptom groups: recurrent wheeze (3RW), recurrent cough (3RC), infrequent symptoms (IS), and no current symptoms (NCS). At age 5 years, these children were seen by a specialist clinician and assessed for persistent wheeze (PW). RESULTS At age 3 years, 69% (234/340) had feasible LCI. Excluding two children with missing data, 232 participants were categorized as follows: 33 (14%) 3RW; 28 (12%) 3RC; 17 (7%) IS; and 154 (66%) NCS. LCI z-score at age 3 years was highest in children with 3RW compared to 3RC (mean (SD): 1.14 (1.56) vs. 0.09 (0.95), p < .01), IS (mean (SD): -0.14 (0.59), p < .01), and NCS (mean (SD): -0.08 (1.06), p < .01). LCI z-score at age 3 was predictive of persistent wheeze at age 5 (PW) (AUROC: 0.87). CONCLUSIONS LCI at age 3 was strongly associated with recurrent wheeze at age 3, and predictive of its persistence to age 5.
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Affiliation(s)
- Shahideh Safavi
- Division of Respiratory Medicine, Department of Pediatrics, Hospital for Sick Children & Research Institute, Toronto, Ontario, Canada
| | - Ruixue Dai
- Division of Respiratory Medicine, Department of Pediatrics, Hospital for Sick Children & Research Institute, Toronto, Ontario, Canada
| | - Vanessa L Breton
- Division of Respiratory Medicine, Department of Pediatrics, Hospital for Sick Children & Research Institute, Toronto, Ontario, Canada
| | - Melanie N Emmerson
- Division of Respiratory Medicine, Department of Pediatrics, Hospital for Sick Children & Research Institute, Toronto, Ontario, Canada
| | - Krzysztof Kowalik
- Division of Respiratory Medicine, Department of Pediatrics, Hospital for Sick Children & Research Institute, Toronto, Ontario, Canada.,Department of Physiology, University of Toronto, Toronto, Ontario, Canada
| | - Zihang Lu
- Department of Public Health Sciences, Queen's University, Kingston, Ontario, Canada
| | - Wendy Lou
- Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
| | - Aimée Dubeau
- Division of Respiratory Medicine, Department of Pediatrics, Hospital for Sick Children & Research Institute, Toronto, Ontario, Canada
| | - Stephanie DeLorenzo
- Division of Respiratory Medicine, Department of Pediatrics, Hospital for Sick Children & Research Institute, Toronto, Ontario, Canada
| | - Meghan B Azad
- Department of Pediatrics and Child Health, Children's Hospital Research Institute of Manitoba, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Allan B Becker
- Department of Pediatrics and Child Health, Children's Hospital Research Institute of Manitoba, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Piush J Mandhane
- Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada
| | - Stuart E Turvey
- Department of Pediatrics, Child & Family Research Institute, BC Children's Hospital, University of British Columbia, Vancouver, British Columbia, Canada
| | - Per Gustafsson
- Department of Pediatrics, Central Hospital, Skövde, Sweden
| | - Diana L Lefebvre
- Department of Medicine, Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Malcolm R Sears
- Department of Medicine, Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Theo J Moraes
- Division of Respiratory Medicine, Department of Pediatrics, Hospital for Sick Children & Research Institute, Toronto, Ontario, Canada
| | - Padmaja Subbarao
- Division of Respiratory Medicine, Department of Pediatrics, Hospital for Sick Children & Research Institute, Toronto, Ontario, Canada.,Department of Physiology, University of Toronto, Toronto, Ontario, Canada.,Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada.,Department of Medicine, Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada
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18
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Walicka-Serzysko K, Postek M, Milczewska J, Sands D. Lung Clearance Index in Children with Cystic Fibrosis during Pulmonary Exacerbation. J Clin Med 2021; 10:4884. [PMID: 34768401 DOI: 10.3390/jcm10214884] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2021] [Revised: 10/13/2021] [Accepted: 10/19/2021] [Indexed: 11/16/2022] Open
Abstract
(1) Background: Pulmonary exacerbation (PEx) is one of the main factors affecting the quality of life and life expectancy in patients with cystic fibrosis (CF). Our study aimed to evaluate the change in selected pulmonary function parameters, including lung clearance index (LCI), in patients with CF diagnosed with PEx. (2) Methods: We enrolled 40 children with CF aged 6–17. They performed spirometry and multiple breath nitrogen washout (MBNW) tests during a stable condition period at the beginning and the end of intravenous antibiotic treatment. (3) Results: LCI increased by 65% and FEV1 decreased by ≥10% in 40% of patients with CF during PEx. An absolute change in LCI between a stable condition period and PEx was 1.05 (±1.92) units, which corresponds to a relative change of 11.48% (±18.61) of the baseline. The relative decrease in FEV1 was −9.22% (±12.00) and the z-score was −0.67 (±1.13). After the PEx treatment, FEV1 increased by 11.05% (±9.04) on average, whereas LCI decreased by 1.21 ± 1.59 units on average, which represented 9.42% ± 11.40 compared to the value at the beginning of PEx. (4) Conclusions: The change in LCI captures a higher proportion of events with functional impairment than FEV1 in school-age children with CF.
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19
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Koucký V. Multiple breath washout test in infants-still in search for technical ideal. Pediatr Pulmonol 2021; 56:2397-2398. [PMID: 34126000 DOI: 10.1002/ppul.25531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Accepted: 06/03/2021] [Indexed: 11/07/2022]
Affiliation(s)
- Václav Koucký
- Department of Pediatrics, 2nd Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic
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20
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Gur M, Ben-David Y, Hanna M, Ilivitzki A, Weichhendler A, Bar-Yoseph R, Toukan Y, Masarweh K, Bentur L. The Association between IgG and Disease Severity Parameters in CF Patients. J Clin Med 2021; 10:jcm10153316. [PMID: 34362100 PMCID: PMC8347508 DOI: 10.3390/jcm10153316] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 07/22/2021] [Accepted: 07/27/2021] [Indexed: 11/18/2022] Open
Abstract
Assessing disease severity in patients with cystic fibrosis (CF) is essential when directing therapies. Serum immunoglobulin G (IgG) levels increase with disease severity. Lung clearance index (LCI) is recognized as an outcome measure for CF clinical trials. Our aim was to evaluate the correlations between IgG and disease severity markers. This was a single-center retrospective study, evaluating association between IgG and markers of severity in CF patients (including clinical characteristics, lung spirometry, LCI, clinical scores and computed tomography (CT) scores) during stable conditions. There were 69 patients, age 20.5 ± 11.6 years. Nineteen (27.5%) patients had elevated IgG. IgG correlated positively with LCI (r = 0.342, p = 0.005). IgG was higher in pancreatic insufficient (PI) and patients with liver disease (1504.3 ± 625.5 vs. 1229 ± 276.1 mg/dL in PI vs. PS, p = 0.023, and 1702.6 ± 720.3 vs. 1256.2 ± 345.5 mg/dL with vs. without liver disease, p = 0.001, respectively). IgG also correlated positively with CRP, CT score, and days with antibiotics in the previous year (r = 0.38, p = 0.003; r = 0.435, p = 0.001; and r = 0.361, p = 0.002, respectively), and negatively with FEV1% and SK score (r = −0.527, p < 0.001 and r = −0.613, p < 0.001, respectively). IgG correlated with clinical parameters, pulmonary functions, and imaging. However, this is still an auxiliary test, complementing other tests, including lung function and imaging tests. Larger multi-center longitudinal studies are warranted.
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Affiliation(s)
- Michal Gur
- Pediatric Pulmonary Institute and CF Center, Rappaport Children’s Hospital, Rambam Health Care Campus, Haifa 3109601, Israel; (M.G.); (Y.B.-D.); (M.H.); (A.W.); (R.B.-Y.); (Y.T.); (K.M.)
- Rappaport Faculty of Medicine, Technion—Israel Institute of Technology, Efron St 1, Haifa 3525422, Israel;
| | - Yael Ben-David
- Pediatric Pulmonary Institute and CF Center, Rappaport Children’s Hospital, Rambam Health Care Campus, Haifa 3109601, Israel; (M.G.); (Y.B.-D.); (M.H.); (A.W.); (R.B.-Y.); (Y.T.); (K.M.)
| | - Moneera Hanna
- Pediatric Pulmonary Institute and CF Center, Rappaport Children’s Hospital, Rambam Health Care Campus, Haifa 3109601, Israel; (M.G.); (Y.B.-D.); (M.H.); (A.W.); (R.B.-Y.); (Y.T.); (K.M.)
| | - Anat Ilivitzki
- Rappaport Faculty of Medicine, Technion—Israel Institute of Technology, Efron St 1, Haifa 3525422, Israel;
- Pediatric Radiology Unit, Ruth Rappaport Children’s Hospital, Rambam Health Care Campus, Haifa 3109601, Israel
| | - Adi Weichhendler
- Pediatric Pulmonary Institute and CF Center, Rappaport Children’s Hospital, Rambam Health Care Campus, Haifa 3109601, Israel; (M.G.); (Y.B.-D.); (M.H.); (A.W.); (R.B.-Y.); (Y.T.); (K.M.)
| | - Ronen Bar-Yoseph
- Pediatric Pulmonary Institute and CF Center, Rappaport Children’s Hospital, Rambam Health Care Campus, Haifa 3109601, Israel; (M.G.); (Y.B.-D.); (M.H.); (A.W.); (R.B.-Y.); (Y.T.); (K.M.)
- Rappaport Faculty of Medicine, Technion—Israel Institute of Technology, Efron St 1, Haifa 3525422, Israel;
| | - Yazeed Toukan
- Pediatric Pulmonary Institute and CF Center, Rappaport Children’s Hospital, Rambam Health Care Campus, Haifa 3109601, Israel; (M.G.); (Y.B.-D.); (M.H.); (A.W.); (R.B.-Y.); (Y.T.); (K.M.)
- Rappaport Faculty of Medicine, Technion—Israel Institute of Technology, Efron St 1, Haifa 3525422, Israel;
| | - Kamal Masarweh
- Pediatric Pulmonary Institute and CF Center, Rappaport Children’s Hospital, Rambam Health Care Campus, Haifa 3109601, Israel; (M.G.); (Y.B.-D.); (M.H.); (A.W.); (R.B.-Y.); (Y.T.); (K.M.)
| | - Lea Bentur
- Pediatric Pulmonary Institute and CF Center, Rappaport Children’s Hospital, Rambam Health Care Campus, Haifa 3109601, Israel; (M.G.); (Y.B.-D.); (M.H.); (A.W.); (R.B.-Y.); (Y.T.); (K.M.)
- Rappaport Faculty of Medicine, Technion—Israel Institute of Technology, Efron St 1, Haifa 3525422, Israel;
- Correspondence: ; Tel.: +972-4-7774360; Fax: +972-4-7774395
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21
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Cohen-Cymberknoh M, Ben Meir E, Gartner S, Reiter J, Spangenberg A, Garriga L, Eisenstadt I, Israeli T, Tsabari R, Shoseyov D, Gileles-Hillel A, Breuer O, Simanovsky N, Kerem E. How abnormal is the normal? Clinical characteristics of CF patients with normal FEV 1. Pediatr Pulmonol 2021; 56:2007-2013. [PMID: 33704929 DOI: 10.1002/ppul.25371] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 02/23/2021] [Accepted: 02/24/2021] [Indexed: 11/07/2022]
Abstract
BACKGROUND Normal values (>80%) of Forced Expiratory Volume in one second (FEV1 ) in patients with cystic fibrosis (CF) may lead to the interpretation that there is no lung disease. This study is a comprehensive analysis of lung involvement in CF patients having normal FEV1 . METHODS Patients were recruited from two CF centers: Hadassah Medical Center, Jerusalem and Vall d' Hebron Hospital, Barcelona. Lung disease was assessed by lung clearance index (LCI), chest CT-Brody score, respiratory cultures, number of pulmonary exacerbations (PEx), and days of antibiotic treatment in the year before the assessment. RESULTS Of the 247 patients, 89 (36%) had FEV1 ≥80% and were included in the study (mean age, 17.6; range, 4.25-49 years). Chronic Pseudomonas aeruginosa infection was found in 21%, and 31% had at least one major PEx in the year before the study. Abnormally elevated LCI was found in 86% of patients, ranging between 7.52 and 18.97, and total Brody score (TBS) was abnormal in 92% (range, 5.0-96.5). Patients with chronic P. aeruginosa had significantly higher LCI (p = .01) and TBS (p = .02) which were associated with more major PEx (p < .01 and p = .01, respectively) and more days of intravenous (IV) antibiotic treatment in the preceding year (p = .03 and p = .001, respectively). CONCLUSIONS Most CF patients with normal FEV1 have already physiological and structural lung abnormalities which were associated with more PEx and IV antibiotic treatment. Further studies are needed to determine if better adherence to the currently used therapies and the new cystic fibrosis transmembrane modulators will prevent the progression of lung disease.
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Affiliation(s)
- Malena Cohen-Cymberknoh
- Pediatric Pulmonology Unit and Cystic Fibrosis Center, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Elad Ben Meir
- Pediatric Pulmonology Unit and Cystic Fibrosis Center, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Silvia Gartner
- Pediatric Pulmonology Unit and Cystic Fibrosis Center, Hospital Universitari Vall d' Hebron, Barcelona, Spain
| | - Joel Reiter
- Pediatric Pulmonology Unit and Cystic Fibrosis Center, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Angeles Spangenberg
- Pediatric Pulmonology Unit and Cystic Fibrosis Center, Hospital Universitari Vall d' Hebron, Barcelona, Spain
| | - Laura Garriga
- Pediatric Pulmonology Unit and Cystic Fibrosis Center, Hospital Universitari Vall d' Hebron, Barcelona, Spain
| | - Iris Eisenstadt
- Department of Physiotherapy and Cystic Fibrosis Center, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Tomer Israeli
- Department of Physiotherapy and Cystic Fibrosis Center, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Reuven Tsabari
- Pediatric Pulmonology Unit and Cystic Fibrosis Center, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - David Shoseyov
- Pediatric Pulmonology Unit and Cystic Fibrosis Center, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Alex Gileles-Hillel
- Pediatric Pulmonology Unit and Cystic Fibrosis Center, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Oded Breuer
- Pediatric Pulmonology Unit and Cystic Fibrosis Center, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Natalia Simanovsky
- Department of Radiology, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Eitan Kerem
- Pediatric Pulmonology Unit and Cystic Fibrosis Center, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
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22
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Sandvik R, Gustafsson PM, Lindblad A, Robinson PD, Nielsen K. Improved agreement between N 2 and SF 6 multiple-breath washout in healthy infants and toddlers with improved EXHALYZER D sensor performance. J Appl Physiol (1985) 2021; 131:107-118. [PMID: 34043468 DOI: 10.1152/japplphysiol.00129.2021] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Recent studies indicate limited utility of nitrogen multiple-breath washout (N2MBW) in infancy and advocate for using sulfur hexafluoride (SF6) MBW in this age-group. Modern N2MBW systems, such as EXHALYZER D (ECO MEDICS AG, Duernten, Switzerland), use O2 and CO2 sensors to calculate N2 concentrations (in principle, N2% = 100 - CO2% - O2%). High O2 and CO2 concentrations have now been shown to significantly suppress signal output from the other sensor, raising apparent N2 concentrations. We examined whether improved EXHALYZER D N2 signal, accomplished after thorough examination of this CO2 and O2 interaction on gas sensors and its correction, leads to better agreement between N2MBW and SF6MBW in healthy infants and toddlers. Within the same session, 52 healthy children aged 1-36 mo [mean = 1.30 (SD = 0.72) yr] completed SF6MBW and N2MBW recordings (EXHALYZER D, SPIROWARE version 3.2.1) during supine quiet sleep. SF6 and N2 SPIROWARE files were reanalyzed offline with in-house software using identical algorithms as in SPIROWARE with or without application of the new correction factors for N2MBW provided by ECO MEDICS AG. Applying the improved N2 signal significantly reduced mean [95% confidence interval (CI)] differences between N2MBW and SF6MBW recorded functional residual capacity (FRC) and lung clearance index (LCI): for FRC, from 26.1 (21.0, 31.2) mL, P < 0.0001, to 1.18 (-2.3, 4.5) mL, P = 0.5, and for LCI, from 1.86 (1.68, 2.02), P < 0.001, to 0.44 (0.33, 0.55), P < 0.001. Correction of N2 signal for CO2 and O2 interactions on gas sensors resulted in markedly closer agreement between N2MBW and SF6MBW outcomes in healthy infants and toddlers.NEW & NOTEWORTHY Modern nitrogen multiple-breath washout (N2MBW) systems such as EXHALYZER D use O2 and CO2 sensors to calculate N2 concentrations. New corrections for interactions between high O2 and CO2 concentrations on the gas sensors now provide accurate N2 signals. The correct N2 signal led to much improved agreement between N2MBW and sulfur hexafluoride (SF6) MBW functional residual capacity (FRC) and lung clearance index (LCI) in 52 sleeping healthy infants and toddlers, suggesting a role for N2MBW in this age-group.
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Affiliation(s)
- Rikke Sandvik
- Danish Paediatric Pulmonary Service, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Per M Gustafsson
- Department of Paediatrics, Central Hospital, Skövde, Sweden.,Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Anders Lindblad
- Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,Gothenburg CF Centre, Queen Silvia Children's Hospital, Gothenburg, Sweden
| | - Paul D Robinson
- Department of Respiratory Medicine, The Children's Hospital at Westmead, Westmead, New South Wales, Australia.,The Discipline of Paediatrics and Child Health, The University of Sydney, Sydney, New South Wales, Australia
| | - Kim Nielsen
- Danish Paediatric Pulmonary Service, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark.,Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
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23
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Kinghorn B, McNamara S, Genatossio A, Sullivan E, Siegel M, Bauer I, Clem C, Johnson RC, Davis M, Griffiths A, Wheeler W, Johnson K, Davis SD, Leigh MW, Rosenfeld M, Pittman J. Comparison of Multiple Breath Washout and Spirometry in Children with Primary Ciliary Dyskinesia and Cystic Fibrosis and Healthy Controls. Ann Am Thorac Soc 2020; 17:1085-93. [PMID: 32603187 DOI: 10.1513/AnnalsATS.201905-375OC] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Rationale: In cystic fibrosis (CF), the lung clearance index (LCI), derived from multiple breath washout (MBW), is more sensitive in detecting early lung disease than FEV1; MBW has been less thoroughly evaluated in young patients with primary ciliary dyskinesia (PCD).Objectives: Our objectives were 1) to evaluate the sensitivity of MBW and spirometry for the detection of mild lung disease in young children with PCD and CF compared with healthy control (HC) subjects and 2) to compare patterns of airway obstruction between disease populations.Methods: We used a multicenter, single-visit, observational study in children with PCD and CF with a forced expiratory volume in 1 second (FEV1) greater than 60% predicted and HC subjects, ages 3-12 years. Nitrogen MBW and spirometry were performed and overread for acceptability. χ2 and Kruskall-Wallis tests compared demographics and lung function measures between groups, linear regression evaluated the effect of disease state, and Spearman's rank correlation coefficient compared the LCI and spirometric measurements.Results: Twenty-five children with PCD, 49 children with CF, and 80 HC children were enrolled, among whom 17 children with PCD (68%), 36 children with CF (73%), and 53 (66%) HC children performed both acceptable spirometry and MBW; these children made up the analytic cohort. The median age was 9.0 years (interquartile range [IQR], 6.8-11.1). The LCI was abnormal (more than 7.8) in 10 of 17 (59%) patients with PCD and 21 of 36 (58%) patients with CF, whereas FEV1 was abnormal in three of 17 (18%) patients with PCD and six of 36 (17%) patients with CF. The LCI was significantly elevated in patients with PCD and CF compared with HC subjects (ratio of geometric mean vs. HC: PCD 1.27; 95% confidence interval [CI], 1.15-1.39; and CF 1.24; 95% CI, 1.15-1.33]). Children with PCD had lower midexpiratory-phase forced expiratory flow % predicted compared with children with CF (62% [IQR, 50-78%] vs. 85% [IQR, 68-99%]; P = 0.05). LCI did not correlate with FEV1.Conclusions: The LCI is more sensitive than FEV1 in detecting lung disease in young patients with PCD, similar to CF. LCI holds promise as a sensitive endpoint for the assessment of early PCD lung disease.
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Dincel A, Yilmaz Yegit C, Ergenekon AP, Erdem Eralp E, Gokdemir Y, Kiyan G, Karadag B. Long-term respiratory outcomes of post-op congenital lung malformations. Pediatr Int 2021; 63:704-709. [PMID: 32991002 DOI: 10.1111/ped.14488] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 08/17/2020] [Accepted: 09/18/2020] [Indexed: 01/22/2023]
Abstract
BACKGROUND Congenital lung malformations (CLM) are rare disorders and surgical intervention is the definitive treatment. Our aim is to evaluate the long-term lung function of patients with CLM after surgery compared to healthy children. METHODS Sixteen children with CLM (M/F: 9/7) and 30 age-matched, healthy controls (M/F: 13/17) were included in the study. Demographic data were recorded and both groups were compared by spirometry and the nitrogen-based Lung Clearance Index (LCI). RESULTS Mean ± SD age of the patients was 12.0 ± 5.4 years. The mean forced expiratory volume in 1 s (FEV1 ), forced vital capacity (FVC), FEV1 /FVC, and forced expiratory flow between 25% and 75% of force expiration (FEF25-75 ) predicted was, 86.68 ± 16.65, 88.00 ± 14.58, 97.44 ± 9.89, and 79.00 ± 26.41, respectively in the patient group. Patients with CLM had significantly lower values in FEV1 , FVC, FEF25-75 than healthy controls (P = 0.002, P 0.007, P 0.045). While the mean LCI2,5% value in patients' group was 8.33 ± 1.52, it was 7.28 ± 0.80 in healthy controls (P = 0.023). Strong inverse correlation between LCI and FEV1 , FEV1 /FVC was detected in the patient group (P = 0.023; r: -0.581, P 0.017; r: -0.606 respectively). CONCLUSION This study revealed that, in long-term follow-up, patients who had surgery because of CLM have impairment in the pulmonary function compared to healthy children and LCI may be more accurate in detecting airway diseases early than spirometry.
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Affiliation(s)
- Alican Dincel
- Department of Pediatrics, School of Medicine, Marmara University, Istanbul, Turkey
| | - Cansu Yilmaz Yegit
- Division of Pediatric Pulmonology, School of Medicine, Marmara University, Istanbul, Turkey
| | - Almala Pinar Ergenekon
- Division of Pediatric Pulmonology, School of Medicine, Marmara University, Istanbul, Turkey
| | - Ela Erdem Eralp
- Division of Pediatric Pulmonology, School of Medicine, Marmara University, Istanbul, Turkey
| | - Yasemin Gokdemir
- Division of Pediatric Pulmonology, School of Medicine, Marmara University, Istanbul, Turkey
| | - Gursu Kiyan
- Department of Pediatric Surgery, School of Medicine, Marmara University, Istanbul, Turkey
| | - Bulent Karadag
- Division of Pediatric Pulmonology, School of Medicine, Marmara University, Istanbul, Turkey
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Pleskova J, Koucky V, Medunova K, Vlckova B, Smolikova L, Pohunek P. Reflex zone stimulation reduces ventilation inhomogeneity in cystic fibrosis: A randomised controlled cross-over study. Pediatr Pulmonol 2021; 56:1558-1565. [PMID: 33656249 DOI: 10.1002/ppul.25350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 02/02/2021] [Accepted: 02/25/2021] [Indexed: 11/06/2022]
Abstract
BACKGROUND The reflex zone stimulation technique (RST) activates complex motor responses and has a positive impact on the locomotor system. This technique may also indirectly affect breathing; however, the use of this technique as adjunct of the treatment of cystic fibrosis (CF) has not yet been characterised. METHODS We performed a randomised controlled single-centre interventional trial to evaluate the short-term effects of RST on lung function in 21 paediatric CF patients with normal baseline spirometry. The effect of 30 min of RST was compared to that of sham therapy in a crossover design. The interventions were performed in random order and planned 6 months apart. The primary outcome was a change in global ventilation inhomogeneity after intervention, assessed by lung clearance index (LCI2.5 ) derived from a nitrogen multiple breath washout test. Secondary outcomes included changes in regional ventilation inhomogeneity (indices of acinar [Sacin*Vt] and conductive airway [Scond*Vt] inhomogeneity) and spirometry parameters (inspiratory capacity, forced vital capacity, and forced expiratory volume in 1 s). Trunk deformity was assessed by physiotherapists at study entry. RESULTS After the RST intervention, the LCI2.5 (p = .004) and Scond*Vt (p = .009) decreased significantly, while inspiratory capacity increased (p = .012). In the sham-therapy group, none of the parameters changed significantly. Trunk deformity was seen in 76.5% of all patients, and 92.9% of those with trunk deformity showed a decrease in LCI2.5 after RST. CONCLUSION RST has multiple positive short-term effects on lung function, especially in CF patients with trunk deformities.
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Affiliation(s)
- Jana Pleskova
- Department of Paediatrics, 2nd Medical Faculty, Charles University and Motol University Hospital, Prague, Czech Republic.,Department of Rehabilitation and Sports Medicine, 2nd Medical Faculty, Charles University and Motol University Hospital, Prague, Czech Republic
| | - Vaclav Koucky
- Department of Paediatrics, 2nd Medical Faculty, Charles University and Motol University Hospital, Prague, Czech Republic
| | - Katerina Medunova
- Department of Rehabilitation and Sports Medicine, 2nd Medical Faculty, Charles University and Motol University Hospital, Prague, Czech Republic
| | - Blanka Vlckova
- Department of Rehabilitation and Sports Medicine, 2nd Medical Faculty, Charles University and Motol University Hospital, Prague, Czech Republic
| | - Libuse Smolikova
- Department of Rehabilitation and Sports Medicine, 2nd Medical Faculty, Charles University and Motol University Hospital, Prague, Czech Republic
| | - Petr Pohunek
- Department of Paediatrics, 2nd Medical Faculty, Charles University and Motol University Hospital, Prague, Czech Republic
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Papale M, Parisi G, Spicuzza L, Rotolo N, Mulè E, Aloisio D, Manti S, Leonardi S. Nocturnal non invasive ventilation in normocapnic cystic fibrosis patients: a pilot study. Acta Biomed 2021; 92:e2021164. [PMID: 33988138 PMCID: PMC8182613 DOI: 10.23750/abm.v92i2.11261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 02/12/2021] [Indexed: 11/23/2022]
Abstract
BACKGROUND AND AIM In patients with cystic fibrosis (CF) non-invasive ventilation (NIV) improves lung mechanics and gas exchange, and decreases the work of breathing. Domiciliary NIV is mainly used in hypercapnic patients with severe disease, because it counteracts the progression of lung functional impairment and it is often used as a useful "bridge" to lung transplantation. However, to date, there are no standardized criteria to indicate the effect of a precocious starting of NIV in patients with functional ventilation inhomogeneity without hypercapnia. In this pilot study we assessed whether an early NIV treatment might influence functional and clinical outcomes in CF patients. METHODS Six normocapnic CF patients were treated for one year with NIV. At baseline and after 1 year of NIV treatment, arterial gas analysis, spirometry, MBW to derive LCI, nocturnal cardio-respiratory polygraphy (PG), and Pittsburgh Sleep Quality Index (PSQI) were perfomed in all enrolled patients. RESULTS After one year, despite spirometric and LCI values remain statistically not modified, the number of infectious exacerbations was reduced by 50%. CONCLUSIONS These results suggest that nocturnal NIV improves clinical conditions of stable CF patients. Finally, we suggest that this procedure can be useful to counteract the progression of lung disease even in normocapnic patients.
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Affiliation(s)
- Maria Papale
- Pediatric Respiratory Unit, San Marco Hospital, Department of Clinical and Experimental Medicine, University of Catania.
| | - Giuseppe Parisi
- Pediatric Respiratory Unit, San Marco Hospital, Department of Clinical and Experimental Medicine, University of Catania.
| | - Lucia Spicuzza
- Respiratory Unit, Department of Clinical and Experimental Medicine, University of Catania.
| | - Novella Rotolo
- Pediatric Respiratory Unit, San Marco Hospital, Department of Clinical and Experimental Medicine, University of Catania.
| | - Enza Mulè
- Pediatric Respiratory Unit, San Marco Hospital, Department of Clinical and Experimental Medicine, University of Catania.
| | - Donatella Aloisio
- Pediatric Respiratory Unit, San Marco Hospital, Department of Clinical and Experimental Medicine, University of Catania.
| | - Sara Manti
- 1UOC Broncopneumologia Pediatrica e Fibrosi Cistica, AOUP "Vittorio-Emanuele", San Marco Hospital, Università di Catania, Catania, Italy.
| | - Salvatore Leonardi
- Pediatric Respiratory Unit, San Marco Hospital, Department of Clinical and Experimental Medicine, University of Catania.
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Perrem L, Stanojevic S, Shaw M, Jensen R, McDonald N, Isaac SM, Davis M, Clem C, Guido J, Jara S, France L, Solomon M, Grasemann H, Waters V, Sweezey N, Sanders DB, Davis SD, Ratjen F. Lung Clearance Index to Track Acute Respiratory Events in School-Age Children with Cystic Fibrosis. Am J Respir Crit Care Med 2021; 203:977-986. [PMID: 33030967 DOI: 10.1164/rccm.202006-2433oc] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Rationale: The lung clearance index (LCI) is responsive to acute respiratory events in preschool children with cystic fibrosis (CF), but its utility to identify and manage these events in school-age children with CF is not well defined.Objectives: To describe changes in LCI with acute respiratory events in school-age children with CF.Methods: In a multisite prospective observational study, the LCI and FEV1 were measured quarterly and during acute respiratory events. Linear regression was used to compare relative changes in LCI and FEV1% predicted at acute respiratory events. Logistic regression was used to compare the odds of a significant worsening in LCI and FEV1% predicted at acute respiratory events. Generalized estimating equation models were used to account for repeated events in the same subject.Measurements and Main Results: A total of 98 children with CF were followed for 2 years. There were 265 acute respiratory events. Relative to a stable baseline measure, LCI (+8.9%; 95% confidence interval, 6.5 to 11.3) and FEV1% predicted (-6.6%; 95% confidence interval, -8.3 to -5.0) worsened with acute respiratory events. A greater proportion of events had a worsening in LCI compared with a decline in FEV1% predicted (41.7% vs. 30.0%; P = 0.012); 53.9% of events were associated with worsening in LCI or FEV1. Neither LCI nor FEV1 recovered to baseline values at the next follow-up visit.Conclusions: In school-age children with CF, the LCI is a sensitive measure to assess lung function worsening with acute respiratory events and incomplete recovery at follow-up. In combination, the LCI and FEV1 capture a higher proportion of events with functional impairment.
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Affiliation(s)
- Lucy Perrem
- Division of Respiratory Medicine and.,Department of Paediatrics and.,Translational Medicine Program, SickKids Research Institute, Toronto, Ontario, Canada.,Royal College of Surgeons in Ireland, Dublin, Ireland.,National Children's Research Centre, Children's Health Ireland, Dublin, Ireland
| | - Sanja Stanojevic
- Institute of Health Policy Management and Evaluation, University of Toronto, Toronto, Ontario, Canada.,Translational Medicine Program, SickKids Research Institute, Toronto, Ontario, Canada
| | - Michelle Shaw
- Translational Medicine Program, SickKids Research Institute, Toronto, Ontario, Canada
| | - Renee Jensen
- Division of Respiratory Medicine and.,Translational Medicine Program, SickKids Research Institute, Toronto, Ontario, Canada
| | - Nancy McDonald
- Division of Respiratory Medicine and.,Translational Medicine Program, SickKids Research Institute, Toronto, Ontario, Canada
| | - Sarah M Isaac
- Translational Medicine Program, SickKids Research Institute, Toronto, Ontario, Canada
| | - Miriam Davis
- Division of Pediatric Pulmonology, Riley Hospital for Children, Indianapolis, Indiana; and
| | - Charles Clem
- Division of Pediatric Pulmonology, Riley Hospital for Children, Indianapolis, Indiana; and
| | - Julia Guido
- Translational Medicine Program, SickKids Research Institute, Toronto, Ontario, Canada
| | - Sylvia Jara
- Division of Pediatric Pulmonology, Riley Hospital for Children, Indianapolis, Indiana; and
| | - Lisa France
- Division of Pediatric Pulmonology, Riley Hospital for Children, Indianapolis, Indiana; and
| | - Melinda Solomon
- Division of Respiratory Medicine and.,Department of Paediatrics and.,Translational Medicine Program, SickKids Research Institute, Toronto, Ontario, Canada
| | - Hartmut Grasemann
- Division of Respiratory Medicine and.,Department of Paediatrics and.,Translational Medicine Program, SickKids Research Institute, Toronto, Ontario, Canada
| | - Valerie Waters
- Division of Infectious Diseases, The Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Paediatrics and.,Translational Medicine Program, SickKids Research Institute, Toronto, Ontario, Canada
| | - Neil Sweezey
- Division of Respiratory Medicine and.,Department of Paediatrics and.,Translational Medicine Program, SickKids Research Institute, Toronto, Ontario, Canada
| | - Don B Sanders
- Division of Pediatric Pulmonology, Riley Hospital for Children, Indianapolis, Indiana; and
| | - Stephanie D Davis
- Division of Pediatric Pulmonology, Department of Pediatrics, University of North Carolina, Chapel Hill, North Carolina
| | - Felix Ratjen
- Division of Respiratory Medicine and.,Department of Paediatrics and.,Translational Medicine Program, SickKids Research Institute, Toronto, Ontario, Canada
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Machogu EM, Khurana M, Kaericher J, Clem CC, Slaven JE, Hatch JE, Davis SD, Peterson-Carmichael S. Lung clearance index in children with sickle cell disease. Pediatr Pulmonol 2021; 56:1165-1172. [PMID: 33241925 DOI: 10.1002/ppul.25186] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 10/08/2020] [Accepted: 11/03/2020] [Indexed: 11/08/2022]
Abstract
INTRODUCTION The lung clearance index (LCI) derived from the multiple breath washout test (MBW), is both feasible and sensitive to early lung disease detection in young children with cystic fibrosis and asthma. The utility of LCI has not been studied in children with sickle cell disease (SCD). We hypothesized that children with SCD, with or without asthma or airway hyperreactivity (AHR), would have an elevated LCI compared to healthy controls. METHODS Children with SCD from a single center between the ages of 6 and 18 years were studied at baseline health and completed MBW, spirometry, plethysmography and blood was drawn for serum markers. Results were compared to healthy controls of similar race, age, and gender. RESULTS Healthy controls (n = 35) had a significantly higher daytime oxygen saturation level, weight and body mass index but not height compared to participants with SCD (n = 34). Total lung capacity (TLC) z-scores were significantly higher in the healthy controls compared to those with SCD (0.87 [1.13] vs. 0.02 [1.27]; p = .005) while differences in forced expiratory volume in 1 s z-scores approached significance (0.26 [0.97] vs. -0.22 [1.09]; p = .055). There was no significant difference in LCI between the healthy controls compared to participants with SCD (7.29 [0.72] vs. 7.40 [0.69]; p = .514). CONCLUSION LCI did not differentiate SCD from healthy controls in children between the ages of 6 and 18 years at baseline health. TLC may be an important pulmonary function measure to follow longitudinally in the pediatric SCD population.
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Affiliation(s)
- Evans M Machogu
- Section of Pediatric Pulmonology, Allergy, and Sleep Medicine, Riley Hospital for Children, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Monica Khurana
- Section of Pediatric Hematology and Oncology, Riley Hospital for Children, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Jennifer Kaericher
- Section of Pediatric Hematology and Oncology, Riley Hospital for Children, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Charles C Clem
- Section of Pediatric Pulmonology, Allergy, and Sleep Medicine, Riley Hospital for Children, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - James E Slaven
- Department of Biostatistics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Joseph E Hatch
- Section of Pediatric Pulmonology, Allergy, and Sleep Medicine, Riley Hospital for Children, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Stephanie D Davis
- Section of Pediatric Pulmonology, Allergy, and Sleep Medicine, Riley Hospital for Children, Indiana University School of Medicine, Indianapolis, Indiana, USA.,Department of Pediatrics, University of North Carolina (UNC) at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA
| | - Stacey Peterson-Carmichael
- Section of Pediatric Pulmonology, Allergy, and Sleep Medicine, Riley Hospital for Children, Indiana University School of Medicine, Indianapolis, Indiana, USA.,Division of Pediatric Pulmonology, Department of Pediatrics, Brenner Children's Hospital Wake Forest Baptist Health, Winston-Salem, North Carolina, USA
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Mondéjar-López P, Horsley A, Ratjen F, Bertolo S, de Vicente H, Asensio de la Cruz Ò. A multimodal approach to detect and monitor early lung disease in cystic fibrosis. Expert Rev Respir Med 2021; 15:761-772. [PMID: 33843417 DOI: 10.1080/17476348.2021.1908131] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Introduction: In the early stages, lung involvement in cystic fibrosis (CF) can be silent, with disease progression occurring in the absence of clinical symptoms. Irreversible airway damage is present in the early stages of disease; however, reliable biomarkers of early damage due to inflammation and infection that are universally applicable in day-to-day patient management have yet to be identified.Areas covered: At present, the main methods of detecting and monitoring early lung disease in CF are the lung clearance index (LCI), computed tomography (CT), and magnetic resonance imaging (MRI). LCI can be used to detect patients who may require more intense monitoring, identify exacerbations, and monitor responses to new interventions. High-resolution CT detects structural alterations in the lungs of CF patients with the best resolution of current imaging techniques. MRI is a radiation-free imaging alternative that provides both morphological and functional information. The role of MRI for short-term follow-up and pulmonary exacerbations is currently being investigated.Expert opinion: The roles of LCI and MRI are expected to expand considerably over the next few years. Meanwhile, closer collaboration between pulmonology and radiology specialties is an important goal toward improving care and optimizing outcomes in young patients with CF.
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Affiliation(s)
- Pedro Mondéjar-López
- Pediatric Pulmonologist, Pediatric Pulmonology and Cystic Fibrosis Unit, University Hospital Virgen de la Arrixaca, Murcia, Spain
| | - Alexander Horsley
- Honorary Consultant, Respiratory Research Group, Division of Infection, Immunity & Respiratory Medicine, University of Manchester, Manchester, UK
| | - Felix Ratjen
- Head, Division of Respiratory Medicine, Department of Pediatrics, Translational Medicine, Hospital for Sick Children, University of Toronto, Toronto, ON, Canada
| | - Silvia Bertolo
- Radiologist, Department of Radiology, Ca'Foncello Regional Hospital, Treviso, Italy
| | | | - Òscar Asensio de la Cruz
- Pediatric Pulmonologist, Pediatric Unit, University Hospital Parc Taulí de Sabadell, Sabadell, Spain
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Walicka-Serzysko K, Postek M, Jeneralska N, Cichocka A, Milczewska J, Sands D. The effects of the addition of a new airway clearance device to chest physiotherapy in children with cystic fibrosis pulmonary exacerbations. J Mother Child 2021; 24:16-24. [PMID: 33544556 PMCID: PMC8258837 DOI: 10.34763/jmotherandchild.20202403.2013.d-20-00008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND Chest physiotherapy plays a crucial role in managing cystic fibrosis, especially during pulmonary exacerbations. This study evaluated the effects of adding a new airway clearance device to chest physiotherapy in subjects with cystic fibrosis hospitalised due to pulmonary exacerbations. METHODS This prospective open-label study was carried out at the Pediatric Cystic Fibrosis Centre in Poland between October 2017 and August 2018. Cystic fibrosis patients aged 10 to 18 years who were admitted to the hospital and required intravenous antibiotic therapy due to pulmonary exacerbations were consecutively allocated (1:1) to either chest physiotherapy alone or chest physiotherapy with a new airway clearance device (Simeox; PhysioAssist). Patients performed spirometry and multiple-breath nitrogen washout for lung clearance index assessment upon admission and prior to discharge. RESULTS Forty-eight cystic fibrosis patients were included (24 in each group). Spirometry parameters in both groups improved significantly after intravenous antibiotic therapy. A significant improvement in the maximum expiratory flow at 25% of forced vital capacity was observed only in the group with a new airway clearance device (p < 0.01 vs. baseline). Trends towards a lower lung clearance index ratio were similar in both groups. No adverse events were observed in either group. CONCLUSIONS Spirometry parameters increased significantly in cystic fibrosis patients treated for pulmonary exacerbations with intravenous antibiotic therapy and intensive chest physiotherapy. The new airway clearance device was safe and well tolerated when added to chest physiotherapy and may be another option for the treatment of pulmonary exacerbation in cystic fibrosis.
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Affiliation(s)
- Katarzyna Walicka-Serzysko
- Cystic Fibrosis Department, Institute of Mother and Child, Warsaw, Poland,Cystic Fibrosis Centre, Pediatric Hospital, Dziekanow Lesny, Poland, E-mail:
| | - Magdalena Postek
- Cystic Fibrosis Department, Institute of Mother and Child, Warsaw, Poland,Cystic Fibrosis Centre, Pediatric Hospital, Dziekanow Lesny, Poland
| | | | | | - Justyna Milczewska
- Cystic Fibrosis Department, Institute of Mother and Child, Warsaw, Poland,Cystic Fibrosis Centre, Pediatric Hospital, Dziekanow Lesny, Poland
| | - Dorota Sands
- Cystic Fibrosis Department, Institute of Mother and Child, Warsaw, Poland,Cystic Fibrosis Centre, Pediatric Hospital, Dziekanow Lesny, Poland
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Frauchiger BS, Carlens J, Herger A, Moeller A, Latzin P, Ramsey KA. Multiple breath washout quality control in the clinical setting. Pediatr Pulmonol 2021; 56:105-112. [PMID: 33058570 DOI: 10.1002/ppul.25119] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 10/08/2020] [Accepted: 10/10/2020] [Indexed: 01/21/2023]
Abstract
BACKGROUND Multiple breath washout (MBW) is increasingly used in the clinical assessment of patients with cystic fibrosis (CF). Guidelines for MBW quality control (QC) were developed primarily for retrospective assessment and central overreading. We assessed whether real-time QC of MBW data during the measurement improves test acceptability in the clinical setting. METHODS We implemented standardized real-time QC and reporting of MBW data at the time of the measurement in the clinical pediatric lung function laboratory in Bern, Switzerland, in children with CF aged 4-18 years. We assessed MBW test acceptability before (31 tests; 89 trials) and after (32 tests; 96 trials) implementation of real-time QC and compared agreement between reviewers. Further, we assessed the implementation of real-time QC at a secondary center in Zurich, Switzerland. RESULTS Before the implementation of real-time QC in Bern, only 58% of clinical MBW tests were deemed acceptable following retrospective QC by an experienced reviewer. After the implementation of real-time QC, MBW test acceptability improved to 75% in Bern. In Zurich, after the implementation of real-time QC, test acceptability improved from 38% to 70%. Further, the agreement between MBW operators and an experienced reviewer for test acceptability was 84% in Bern and 93% in Zurich. CONCLUSION Real-time QC of MBW data at the time of measurement is feasible in the clinical setting and results in improved test acceptability.
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Affiliation(s)
- Bettina S Frauchiger
- Pediatric Respiratory Medicine, Department of Pediatrics, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Julia Carlens
- Pediatric Respiratory Medicine, Department of Pediatrics, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.,Clinic for Paediatric Pneumology, Allergology and Neonatology, Hannover Medical School, Hannover, Germany
| | - Andreas Herger
- Division of Respiratory Medicine and Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Alexander Moeller
- Division of Respiratory Medicine and Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Philipp Latzin
- Pediatric Respiratory Medicine, Department of Pediatrics, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Kathryn A Ramsey
- Pediatric Respiratory Medicine, Department of Pediatrics, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
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32
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Postek M, Walicka-Serzysko K, Milczewska J, Sands D. What Is Most Suitable for Children With Cystic Fibrosis-The Relationship Between Spirometry, Oscillometry, and Multiple Breath Nitrogen Washout. Front Pediatr 2021; 9:692949. [PMID: 35096700 PMCID: PMC8795905 DOI: 10.3389/fped.2021.692949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Accepted: 11/29/2021] [Indexed: 11/13/2022] Open
Abstract
INTRODUCTION In cystic fibrosis (CF), pathological lung changes begin early in life. The technological progress currently gives many diagnostic possibilities. However, pulmonary function testing in children remains problematic. OBJECTIVES Our study aimed to correlate the results of impulse oscillometry (IOS) with those of multiple breath nitrogen washout (MBNW) in our pediatric CF population. We also compared those parameters between the groups with and without spirometric features of obturation. METHODS We collected 150 pulmonary function test sets, including spirometry, IOS, and MBNW in patients with CF aged 12.08 ± 3.85 years [6-18]. The study group was divided into two subgroups: IA (without obturation) and IB (with obturation). We also compared Sacin, Scond, and oscillometry parameters of 20 patients aged 14-18 years who reached the appropriate tidal volume (VT) during MBNW. RESULTS Statistical analysis showed a negative correlation between lung clearance index (LCI) and spimoetric parameters. Comparison of subgroups IA (n = 102) and IB (n = 48) indicated a statistically significant difference in LCI (p < 0.001) and FEV1z-score (p < 0.001), FEV1% pred (p < 0.001), MEF25z-score (p < 0.001), MEF50 z-score (p < 0.001), MEF75 z-score (p < 0.001), R5% pred (p < 0.05), and R20% pred (p < 0.01). LCI higher than 7.91 was found in 75.33% of the study group, in subgroup IB-91.67%, and IA-67.6%. CONCLUSIONS LCI derived from MBNW may be a better tool than IOS for assessing pulmonary function in patients with CF, particularly those who cannot perform spirometry.
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Affiliation(s)
- Magdalena Postek
- Cystic Fibrosis Department, Institute of Mother and Child, Warsaw, Poland.,Cystic Fibrosis Centre, Pediatric Hospital, Dziekanów Leśny, Poland
| | - Katarzyna Walicka-Serzysko
- Cystic Fibrosis Department, Institute of Mother and Child, Warsaw, Poland.,Cystic Fibrosis Centre, Pediatric Hospital, Dziekanów Leśny, Poland
| | - Justyna Milczewska
- Cystic Fibrosis Department, Institute of Mother and Child, Warsaw, Poland.,Cystic Fibrosis Centre, Pediatric Hospital, Dziekanów Leśny, Poland
| | - Dorota Sands
- Cystic Fibrosis Department, Institute of Mother and Child, Warsaw, Poland.,Cystic Fibrosis Centre, Pediatric Hospital, Dziekanów Leśny, Poland
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Affiliation(s)
- Peter A Robbins
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, United Kingdom
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Parisi GF, Cannata E, Manti S, Papale M, Meli M, Russo G, Di Cataldo A, Leonardi S. Lung clearance index: A new measure of late lung complications of cancer therapy in children. Pediatr Pulmonol 2020; 55:3450-3456. [PMID: 32926567 DOI: 10.1002/ppul.25071] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Revised: 09/07/2020] [Accepted: 09/10/2020] [Indexed: 11/05/2022]
Abstract
INTRODUCTION Childhood cancer survivors (CSs) might face an increased lifelong risk of lung function impairment. The lung clearance index (LCI) has been described as being more sensitive than spirometry in the early stages of some lung diseases. The aim of this study was to evaluate this index in a cohort of patients with a history of childhood cancer for the first time. MATERIALS AND METHODS We evaluated 57 off-treatment CSs aged 0-18 years old and 50 healthy controls (HCs). We used the multiple-breath washout method to study LCI and spirometry. RESULTS CSs did not show any differences from the controls in ventilation homogeneity (LCI 6.78 ± 1.35 vs. 6.32 ± 0.44; p: not significant [ns]) or lung function (FEV1 99.9 ± 11.3% vs. 103.0 ± 5.9% of predicted; p: ns; FVC 98.2 ± 10.3% vs. 101.1 ± 3.3% of predicted). LCI significantly correlated with the number of years since the last chemotherapy (r = .35, p < .05). CONCLUSIONS Our study describes the trend of LCI in a cohort of CSs and compares it with the results obtained from HCs. The results show that patients maintain both good values of respiratory function and good homogeneity of ventilation during childhood. Moreover, as LCI increases and worsens as the years pass after the end of the treatment could identify the tendency toward pulmonary fibrosis, which is typical of adult CSs, at an earlier time than spirometry.
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Affiliation(s)
- Giuseppe F Parisi
- Pediatric Pulmonology Unit, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Emanuela Cannata
- Pediatric Hemato-Oncology Unit, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Sara Manti
- Pediatric Pulmonology Unit, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Maria Papale
- Pediatric Pulmonology Unit, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Mariaclaudia Meli
- Pediatric Hemato-Oncology Unit, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Giovanna Russo
- Pediatric Hemato-Oncology Unit, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Andrea Di Cataldo
- Pediatric Hemato-Oncology Unit, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Salvatore Leonardi
- Pediatric Pulmonology Unit, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
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Walicka-Serzysko K, Postek M, Milczewska J, Sands D. Lung function deterioration in school children with cystic fibrosis. Pediatr Pulmonol 2020; 55:3030-3038. [PMID: 32761970 DOI: 10.1002/ppul.25013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 07/16/2020] [Accepted: 08/05/2020] [Indexed: 01/25/2023]
Abstract
INTRODUCTION Lung disease in cystic fibrosis (CF) begins early in life but the capabilities for detecting abnormalities of pulmonary dysfunction in children remain limited. OBJECTIVE The study aimed to evaluate the early progression of lung function by the analysis of pulmonary hyperinflation, ventilation inhomogeneity (VI), trapped gas and airway obstruction with age. METHODS One hundred CF children aged 7 to 18, divided into two groups aged 7 to 12 (n = 40) and 13 to 18 (n = 60), were enrolled. Patients performed multiple-breath nitrogen washout (MBNW) tests and plethysmography for measurements of lung clearance index (LCI), functional residual capacity (FRCpleth , FRCMBNW ), volume of trapped gas (VT ), total resistance, and effective and specific effective airway resistance (Reff , sReff ). RESULTS We obtained a positive correlation of FRCpleth , FRCMBNW , and LCI with age. A linear correlation between FRCMBNW and FRCpleth (P < .0001) was observed. VI was higher in the group of older patients (9.79 in the group aged 7-12 and 11.67 in the group aged 13-18). An increased effective specific airway resistance >2 (z-score) was present in 58% of all subjects (50% and 63.3%, respectively). Pulmonary hyperinflation (FRCpleth >2 z-score) was observed in 33% of all patients: 25% and 36.6%, respectively. Trapped gas (VT > 2 z-score) was present in 18% of all children: 30% and 10%, respectively. CONCLUSION A gradual decline in lung function is associated with an increase in VI, airway obstruction, pulmonary hyperinflation and development of trapped gas. In children who cannot perform either spirometry or plethysmography, MBNW can deliver a measurement of LCI connecting with VI as well as FRCMBNW to indicate indirectly the increase of hyperinflation.
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Affiliation(s)
- Katarzyna Walicka-Serzysko
- Cystic Fibrosis Department, Institute of Mother and Child, Warsaw, Poland.,Cystic Fibrosis Centre, Clinical Department of Lung Diseases, Pediatric Hospital, Dziekanow Lesny, Poland
| | - Magdalena Postek
- Cystic Fibrosis Department, Institute of Mother and Child, Warsaw, Poland.,Cystic Fibrosis Centre, Clinical Department of Lung Diseases, Pediatric Hospital, Dziekanow Lesny, Poland
| | - Justyna Milczewska
- Cystic Fibrosis Department, Institute of Mother and Child, Warsaw, Poland.,Cystic Fibrosis Centre, Clinical Department of Lung Diseases, Pediatric Hospital, Dziekanow Lesny, Poland
| | - Dorota Sands
- Cystic Fibrosis Department, Institute of Mother and Child, Warsaw, Poland.,Cystic Fibrosis Centre, Clinical Department of Lung Diseases, Pediatric Hospital, Dziekanow Lesny, Poland
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Motta-Ribeiro GC, Winkler T. Breathing freely during nitrogen washout. J Appl Physiol (1985) 2020; 129:1150-1151. [PMID: 33090907 DOI: 10.1152/japplphysiol.00847.2020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- Gabriel C Motta-Ribeiro
- Biomedical Engineering Programme, COPPE, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Tilo Winkler
- Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
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Kowalik K, Dai R, Safavi S, Reyna ME, Lou W, Lepine C, McDonald E, Schaap MJ, Brydges MG, Dubeau A, Boutis K, Narang I, Eiwegger T, Moraes TJ, Ratjen F, Subbarao P. Persistent ventilation inhomogeneity after an acute exacerbation in preschool children with recurrent wheezing. Pediatr Allergy Immunol 2020; 31:608-615. [PMID: 32160369 DOI: 10.1111/pai.13245] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Revised: 03/02/2020] [Accepted: 03/04/2020] [Indexed: 11/29/2022]
Abstract
BACKGROUND Preschool children with recurrent wheezing suffer high morbidity. It is unclear whether objective measures of asthma control, such as pulmonary function tests (PFTs), provide additional information to the clinical assessment. METHODS We recruited children between 3 and 6 years old, with a history of recurrent wheezing in the preceding year and treated for acute wheezing exacerbation in the emergency department (ED) into an observational cohort study. Children attended two outpatient visits: the first study visit within five days of discharge from the ED and the second study visit 12 weeks after the ED visit. We performed standardized symptom score (test for respiratory and asthma control in kids (TRACK)), multiple breath washout (MBW), spirometry, and clinical assessment at both visits. RESULTS Seventy-four children, mean (standard deviation (SD)) age of 4.32 years (0.84), attended both visits. Paired FEV0.75 and lung clearance index (LCI) measurements at both time points were obtained in 37 and 34 subjects, respectively. Feasibility for all tests improved at visit 2 and was not age-dependent. At the second study visit, a third had controlled asthma based on the TRACK score, and the mean lung clearance index (LCI) improved from 9.86 to 8.31 (P = .003); however, 46% had an LCI in the abnormal range. FEV0.75 z-score improved from -1.66 to -1.17 (P = .05) but remained in the abnormal range in 24%. LCI was abnormal in more than half of the children with "well-controlled" asthma based on the TRACK score. There was no correlation between PFT measures and TRACK scores at either visit. CONCLUSIONS Lung clearance index demonstrates a persistent deficit post-exacerbation in a large proportion of preschoolers with recurrent wheezing, highlighting that symptom scores alone may not suffice for monitoring these children.
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Affiliation(s)
- Krzysztof Kowalik
- Division of Respiratory Medicine, Department of Paediatrics, Program in Translational Medicine, SickKids Research Institute, The Hospital for Sick Children, Toronto, Canada
| | - Ruixue Dai
- Division of Respiratory Medicine, Department of Paediatrics, Program in Translational Medicine, SickKids Research Institute, The Hospital for Sick Children, Toronto, Canada
| | - Shahideh Safavi
- Respiratory Medicine Department, Queen's Medical Centre, University of Nottingham School of Medicine, Nottingham, UK
| | - Myrtha E Reyna
- Division of Respiratory Medicine, Department of Paediatrics, Program in Translational Medicine, SickKids Research Institute, The Hospital for Sick Children, Toronto, Canada
| | - Wendy Lou
- Dalla Lana School of Public Health, Division of Biostatistics, University of Toronto, Toronto, Canada
| | - Claire Lepine
- Division of Respiratory Medicine, Department of Paediatrics, Program in Translational Medicine, SickKids Research Institute, The Hospital for Sick Children, Toronto, Canada
| | - Erica McDonald
- Division of Respiratory Medicine, Department of Paediatrics, Program in Translational Medicine, SickKids Research Institute, The Hospital for Sick Children, Toronto, Canada
| | - Mirjam J Schaap
- Division of Respiratory Medicine, Department of Paediatrics, Program in Translational Medicine, SickKids Research Institute, The Hospital for Sick Children, Toronto, Canada.,Division of Respiratory Medicine and Allergy, Department of Pediatrics, Radboud University Medical Center Amalia Children's Hospital, Nijmegen, The Netherlands
| | - May G Brydges
- Division of Respiratory Medicine, Department of Paediatrics, Program in Translational Medicine, SickKids Research Institute, The Hospital for Sick Children, Toronto, Canada
| | - Aimee Dubeau
- Division of Respiratory Medicine, Department of Paediatrics, Program in Translational Medicine, SickKids Research Institute, The Hospital for Sick Children, Toronto, Canada
| | - Kathy Boutis
- Division of Paediatric Emergency Medicine, Department of Paediatrics, Program in Child Health Evaluative Sciences, SickKids Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Canada
| | - Indra Narang
- Division of Respiratory Medicine, Department of Paediatrics, Program in Translational Medicine, SickKids Research Institute, The Hospital for Sick Children, Toronto, Canada
| | - Thomas Eiwegger
- Division of Immunology & Allergy, Department of Paediatrics, Program in Translational Medicine, SickKids Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Canada
| | - Theo J Moraes
- Division of Respiratory Medicine, Department of Paediatrics, Program in Translational Medicine, SickKids Research Institute, The Hospital for Sick Children, Toronto, Canada
| | - Felix Ratjen
- Division of Respiratory Medicine, Department of Paediatrics, Program in Translational Medicine, SickKids Research Institute, The Hospital for Sick Children, Toronto, Canada
| | - Padmaja Subbarao
- Division of Respiratory Medicine, Department of Paediatrics, Program in Translational Medicine, SickKids Research Institute, The Hospital for Sick Children, Toronto, Canada.,Department of Physiology, Faculty of Medicine, University of Toronto, Toronto, Canada.,Dalla Lana School of Public Health, Division of Epidemiology, University of Toronto, Toronto, Canada
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Amitai N, Stafler P, Blau H, Kaplan E, Mussaffi H, Levine H, Steuer G, Bar-Yishay E, Klinger G, Mei-Zahav M, Prais D. Palivizumab Following Extremely Premature Birth Does Not Affect Pulmonary Outcomes in Adolescence. Chest 2020; 158:660-669. [PMID: 32298728 DOI: 10.1016/j.chest.2020.02.075] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 02/24/2020] [Accepted: 02/27/2020] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Prematurity is a risk factor for impaired lung function. We sought to assess the long-term effect of palivizumab immunization and extreme prematurity (<29 weeks gestation) on respiratory symptoms and pulmonary function in adolescence. RESEARCH QUESTION What is the long-term effect of palivizumab immunization and extreme prematurity (<29 weeks) on respiratory symptoms and pulmonary function in adolescence? STUDY DESIGN AND METHODS We examined survivors of extreme prematurity (<29 weeks gestation) at 13 to 18 years of age (study group). Study group babies who were born immediately before palivizumab immunization (nonpalivizumab group [NPG]) were compared with those babies who were born just after implementation (PG) and with a control group. For study group patients, lung function in adolescence was further compared longitudinally with that at primary school age. RESULTS Sixty-four adolescents aged 15.76 ± 1.52 years were included: 46 in the study group (17 PG and 29 NPG) and 18 in the control group. For the study group, wheezing episodes, inhaler use, and hospitalizations were uncommon. For the study group compared with the control group, FEV1 percent predicted was 82.60% ± 13.54% vs 105.83% ± 13.12% (P < .001), and the lung clearance index was 7.67 ± 1.02 vs 7.46 ± 0.70 (P = .48), respectively. Study group adolescents with bronchopulmonary dysplasia had a higher lung clearance index than did adolescents with no bronchopulmonary dysplasia (7.94 ± 1.11 vs 7.20 ± 0.60; P = .002). PG and NPG adolescents were not significantly different. Comparing the study group in adolescence with primary school age, we found improvement in mean FEV1 percent predicted bronchodilator response (0.37% ± 9.98% vs 5.67% ± 9.87%; P = .036) and mean provocative concentration causing 20% decline in FEV1 (12.16 ± 4.71 mg/mL vs 4.14 ± 4.51 mg/mL, respectively; P < .001). INTERPRETATION Palivizumab did not provide any discernable long-term protective effect. Nevertheless, adolescent survivors of extreme prematurity showed good clinical and physiologic outcomes, except for mildly raised lung clearance index in patients with bronchopulmonary dysplasia. Airway hyperreactivity detected at primary school age, decreased by adolescence.
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Affiliation(s)
- Nofar Amitai
- Pulmonary Institute, Schneider Children's Medical Center of Israel, Petah Tikva
| | - Patrick Stafler
- Pulmonary Institute, Schneider Children's Medical Center of Israel, Petah Tikva; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv
| | - Hannah Blau
- Pulmonary Institute, Schneider Children's Medical Center of Israel, Petah Tikva; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv
| | - Eytan Kaplan
- Pediatric Intensive Care Unit, Schneider Children's Medical Center of Israel, Petah Tikva; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv
| | - Huda Mussaffi
- Pulmonary Institute, Schneider Children's Medical Center of Israel, Petah Tikva; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv
| | - Hagit Levine
- Pulmonary Institute, Schneider Children's Medical Center of Israel, Petah Tikva; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv
| | - Guy Steuer
- Pulmonary Institute, Schneider Children's Medical Center of Israel, Petah Tikva
| | - Ephraim Bar-Yishay
- Faculty of Health Sciences, Ben Gurion University of the Negev, Beer Sheba, Israel
| | - Gil Klinger
- Neonatal Intensive Care Unit, Schneider Children's Medical Center of Israel, Petah Tikva; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv
| | - Meir Mei-Zahav
- Pulmonary Institute, Schneider Children's Medical Center of Israel, Petah Tikva; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv
| | - Dario Prais
- Pulmonary Institute, Schneider Children's Medical Center of Israel, Petah Tikva; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv.
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Perrem L, Stanojevic S, Shaw M, Davis S, Retsch-Bogart G, Ratjen F. Changes in the parent cystic fibrosis questionnaire-revised (CFQ-R) with respiratory symptoms in preschool children with cystic fibrosis. J Cyst Fibros 2020; 19:492-8. [PMID: 32139196 DOI: 10.1016/j.jcf.2020.02.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 02/22/2020] [Accepted: 02/24/2020] [Indexed: 01/03/2023]
Abstract
INTRODUCTION The Cystic Fibrosis Questionnaire-Revised (CFQ-R) Respiratory score is a validated and widely used patient-reported outcome. This study aimed to establish changes in the score with acute respiratory events in preschool children with CF and to investigate its' relationship with physiological outcomes. METHODS The Parent CFQ-R, multiple breath washout test and spirometry were performed at six study visits over one year. The clinical status of participants, stable or symptomatic, was defined by the patient's physician. Linear regression and distribution-based statistical methods were used to examine the changes in the CFQ-R from the last stable visit and to investigate its relationship with physiological outcomes. RESULTS There were 272 stable and 115 symptomatic visits from 78 participants. The mean CFQ-R Respiratory score did not change between consecutive stable visits (-0.73, SD 20.4). The mean (SD) score deteriorated by 15.5 (20.7) points between stable and symptomatic visits and improved by 14.8 (20.1) points between symptomatic and stable follow-up visits. When a clinically important change is defined as 0.5SD change (10-points), the positive predictive value (PPV) was 45% and the negative predictive value (NPV) was 84%. For visits with a 10-point worsening in the CFQ-R Respiratory score and a 15% increase in LCI, the PPV was better (81%) than using either measure alone. CONCLUSION The CFQ-R Respiratory score is responsive to acute respiratory events in preschool children with CF and its utility to monitor individual patients is improved when combined with LCI.
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Gambazza S, Guarise R, Carta F, Ambrogi F, Mirabella M, Brivio A, Colombo C. Exercise capacity and ventilation inhomogeneity in cystic fibrosis: A cross-sectional study. Pediatr Pulmonol 2020; 55:394-400. [PMID: 31943945 DOI: 10.1002/ppul.24525] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Accepted: 09/06/2019] [Indexed: 11/11/2022]
Abstract
BACKGROUND Lung clearance index (LCI2.5 ) is a marker of overall lung ventilation inhomogeneity and has proven to be able to detect early peripheral damage in subjects with cystic fibrosis (CF), with greater sensitivity than conventional spirometry. Combining its sensitivity with the output of an incremental exercise testing, we hypothesized that any sign of ventilation inhomogeneity in subjects without severe airflow obstruction and with a normal exercise tolerance could be relevant for the CF team, tracking early lung disease and potential exercise limiting factors. METHODS Patients with CF in clinical stable conditions were recruited between 2015 and 2017. Available spirometry, nitrogen multiple-breath washout test and symptoms-limited exercise testing performed as parts of patients' annual routine evaluation were considered for this cross-sectional study. To describe the relationship between exercise intensity and ventilation inhomogeneity, a linear regression analysis was performed using backward elimination based on Akaike information criteria. RESULTS Seventy-seven patients (38 females) were included. Sacin and LCI2.5 were significantly higher in patients with an overall reduced exercise tolerance. Peak work developed during exercise was associated with body mass index (b = 5.25; 95% confidence interval [CI] = 1.53-8.98), forced expiratory volume in 1 second (FEV1 ; b = 3.71; 95% CI = 1.96-5.46), Pseudomonas aeruginosa chronic infection (b = -8.84; 95% CI = -15.84 to -1.84) but not with LCI2.5 . CONCLUSION Exercise capacity and airflow obstruction are associated in this Italian CF cohort. Considering the greater discriminatory power of LCI2.5 over FEV1 and peak work, the Godfrey protocol without gas analysis cannot provide detailed information about lung function or efficiency. However, this incremental protocol without gas exchange measures can still provide the CF team with information about exercise tolerance and disability.
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Affiliation(s)
- Simone Gambazza
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Cystic Fibrosis Centre, Milan, Italy.,Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan, Italy.,Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, U.O.C. Direzione delle Professioni Sanitarie, Milan, Italy
| | - Riccardo Guarise
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Cystic Fibrosis Centre, Milan, Italy
| | - Federica Carta
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Cystic Fibrosis Centre, Milan, Italy.,Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, U.O.C. Direzione delle Professioni Sanitarie, Milan, Italy
| | - Federico Ambrogi
- Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan, Italy
| | - Marina Mirabella
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, U.O.C. Direzione delle Professioni Sanitarie, Milan, Italy
| | - Anna Brivio
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Cystic Fibrosis Centre, Milan, Italy.,Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, U.O.C. Direzione delle Professioni Sanitarie, Milan, Italy
| | - Carla Colombo
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Cystic Fibrosis Centre, Milan, Italy.,Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Milan, Italy
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Yaacoby-Bianu K, Plonsky MT, Gur M, Bar-Yoseph R, Kugelman A, Bentur L. Effect of late preterm birth on lung clearance index and respiratory physiology in school-age children. Pediatr Pulmonol 2019; 54:1250-1256. [PMID: 31091024 DOI: 10.1002/ppul.24357] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Revised: 04/06/2019] [Accepted: 04/26/2019] [Indexed: 01/09/2023]
Abstract
BACKGROUND We hypothesized that former late preterm (LP) children have abnormal pulmonary physiology parameters, including uneven ventilation distribution, due to premature disruption of normal lung development. METHODS A cross-sectional study evaluating former LP children at the age of 6 to 12 years as compared to term controls. Demographics and child's and family history of asthma/atopy/smoking were recorded. The outcome parameters were spirometry, multiple breath washout (MBW) measurement by lung clearance index (LCI), 6-minute walk test (6MWT), symptoms related to asthma and allergy, and Godin Leisure-Time Exercise Questionnaire. RESULTS Twenty-nine former LP were compared to 30 term-control children (mean age, 8.2 ± 1.7 and 8.8 ± 1.8 years, respectively). LP had reduced forced expiratory volume in the first second (FEV1) and forced vital capacity (FVC) compared to term controls (FEV1 1.59 ± 0.48 vs 1.80 ± 0.39 L, P = 0.005 and FVC 1.73 ± 0.45 vs 1.99 ± 0.49 L, P = 0.009). There were no differences between the two groups regarding FEV1/FVC, forced expiratory flow between 25 and 75 (FEF25-75), LCI (7.10 ± 0.79 vs 6.96 ± 0.75, P = 0.50), 6MW distance, and weekly leisure-activity score. Former LP children had more episodes of wheezing and greater use of asthma medication. CONCLUSIONS This pilot study suggests that LP have lower pulmonary function tests (PFTs) but not ventilation inhomogeneity measured by LCI or functional disturbance. It is unclear if the differences in PFTs are due to late prematurity by itself or are the consequence of maternal and neonatal factors associated with LP. Further larger studies are required to assess the long-term respiratory consequences of LP birth.
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Affiliation(s)
- Karin Yaacoby-Bianu
- Pediatric Pulmonary Institute and CF Center, Ruth Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
| | - Moran T Plonsky
- Department of Pediatrics B, Ruth Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
| | - Michal Gur
- Pediatric Pulmonary Institute and CF Center, Ruth Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel.,Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Ronen Bar-Yoseph
- Pediatric Pulmonary Institute and CF Center, Ruth Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
| | - Amir Kugelman
- Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel.,Department of Neonatal Intensive Care, Ruth Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
| | - Lea Bentur
- Pediatric Pulmonary Institute and CF Center, Ruth Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel.,Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
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Shawcross A, Murray CS, Pike K, Horsley A. A novel method for infant multiple breath washout: First report in clinical practice. Pediatr Pulmonol 2019; 54:1284-1290. [PMID: 31211518 DOI: 10.1002/ppul.24384] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2018] [Revised: 11/23/2018] [Accepted: 11/30/2018] [Indexed: 11/09/2022]
Abstract
BACKGROUND Lung clearance index (LCI), measured using multiple breath inert gas washout (MBW) is a potentially useful test in infants with respiratory disease, particularly cystic fibrosis (CF). Clinical use is limited however by the need for specialist staff and equipment. We have previously described a novel method for infant MBW suitable for use outside of specialist laboratories. This study describes its performance in vivo in infants with CF and healthy controls, including a limited comparison with the respiratory mass spectrometer. METHODS Children aged less than 2 years with CF and controls underwent MBW testing on a single occasion. The practical applicability of the system was determined by the number of successful duplicate tests and within-subject repeatability. RESULTS Twenty-five children (seven with CF, 18 healthy controls, all sedated with chloral hydrate) attempted MBW. Twenty patients (seven with CF) successfully underwent duplicate testing (80% success rate). Mean within-subject coefficient of variation for functional residual capacity (FRC) was 7.2% and for LCI 5.9%. Comparison of LCI with the mass spectrometer was limited but gave very similar values for LCI and FRC in those patients who underwent technically adequate tests with both methods. CONCLUSIONS We have described a new MBW method that is feasible and reproducible in sedated infants. Results fall within the expected range, and well within accuracy limits set by international guidelines. This could provide a more accessible alternative to previously described systems for infant MBW, and overcomes many of the technical challenges inherent in conventional MBW.
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Affiliation(s)
- Anna Shawcross
- Division of Infection, Immunity & Respiratory Medicine, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK.,Department of Paediatric Respiratory Medicine, Royal Manchester Children's Hospital, Manchester, UK
| | - Clare S Murray
- Division of Infection, Immunity & Respiratory Medicine, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK.,Department of Paediatric Respiratory Medicine, Royal Manchester Children's Hospital, Manchester, UK
| | - Katy Pike
- UCL Great Ormond Street Institute of Child Health, University College London, London, UK.,Department of Paediatric Respiratory Medicine, Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK
| | - Alex Horsley
- Division of Infection, Immunity & Respiratory Medicine, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK.,Manchester Adult Cystic Fibrosis Centre, Manchester University Hospitals NHS Foundation Trust, Manchester, UK
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Robinson PD, Latzin P, Ramsey KA, Stanojevic S, Aurora P, Davis SD, Gappa M, Hall GL, Horsley A, Jensen R, Lum S, Milla C, Nielsen KG, Pittman JE, Rosenfeld M, Singer F, Subbarao P, Gustafsson PM, Ratjen F. Preschool Multiple-Breath Washout Testing. An Official American Thoracic Society Technical Statement. Am J Respir Crit Care Med 2019; 197:e1-e19. [PMID: 29493315 DOI: 10.1164/rccm.201801-0074st] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
BACKGROUND Obstructive airway disease is nonuniformly distributed throughout the bronchial tree, although the extent to which this occurs can vary among conditions. The multiple-breath washout (MBW) test offers important insights into pediatric lung disease, not available through spirometry or resistance measurements. The European Respiratory Society/American Thoracic Society inert gas washout consensus statement led to the emergence of validated commercial equipment for the age group 6 years and above; specific recommendations for preschool children were beyond the scope of the document. Subsequently, the focus has shifted to MBW applications within preschool subjects (aged 2-6 yr), where a "window of opportunity" exists for early diagnosis of obstructive lung disease and intervention. METHODS This preschool-specific technical standards document was developed by an international group of experts, with expertise in both custom-built and commercial MBW equipment. A comprehensive review of published evidence was performed. RESULTS Recommendations were devised across areas that place specific age-related demands on MBW systems. Citing evidence where available in the literature, recommendations are made regarding procedures that should be used to achieve robust MBW results in the preschool age range. The present work also highlights the important unanswered questions that need to be addressed in future work. CONCLUSIONS Consensus recommendations are outlined to direct interested groups of manufacturers, researchers, and clinicians in preschool device design, test performance, and data analysis for the MBW technique.
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Walicka-Serzysko K, Postek M, Milczewska J, Sands D. Change in lung clearance index with microbiological status in children with cystic fibrosis. Pediatr Pulmonol 2019; 54:729-736. [PMID: 30838817 DOI: 10.1002/ppul.24278] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Accepted: 01/21/2019] [Indexed: 11/08/2022]
Abstract
The impact of infections caused by bacteria, especially Gram-negative, on the progression of lung disease in cystic fibrosis is well established. Decline in pulmonary function commence already at early age. In this group of patients, the lung clearance index seems to be a better marker than FEV1 allowing non-invasive monitoring of changes in small airways. The aim of this study was to investigate the association between the microbiological status and LCI derived from multiple breath washout (MBW) technique as well as FEV1 and FVC in children suffering from cystic fibrosis. Over the 1-year recruitment period, 136 CF patients aged 5-18 with: Staphylococcus aureus (n-27), Pseudomonas aeruginosa (first time (n-27), intermittent (n-9), and chronic (34) infection), Aspergillus fumigatus (n-6) and without pathogenic flora (n-33) were included in the study. Patients had performed a spirometry and MBW test during the visit at outpatient clinic. The study showed that the lung clearance index in patients infected with Aspergillus fumigatus was significantly higher (P < 0.05) than in those with normal throat flora. There was also statistically significant differences in the lung clearance index obtained in subjects with chronic Pseudomonas aeruginosa infection and those with first Pseudomonas aeruginosa infection (P < 0.05). Furthermore, significant statistical differences (P < 0.05) were observed between the groups of patients with chronic Pseudomonas aeruginosa infection FEV1 > 70% and FEV1 < 70%. In conclusion, LCI was associated with microbiological status of CF patients. Chronic lung infections, especially Aspergillus fumigatus and Pseudomonas aeruginosa, were associated with increased LCI. Early eradication of pathological flora positively affects the maintenance of lower LCI.
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Affiliation(s)
- Katarzyna Walicka-Serzysko
- Cystic Fibrosis Department, Institute of Mother and Child, Warsaw, Poland.,Cystic Fibrosis Centre, Pediatric Hospital, Dziekanów Leśny, Poland
| | - Magdalena Postek
- Cystic Fibrosis Department, Institute of Mother and Child, Warsaw, Poland.,Cystic Fibrosis Centre, Pediatric Hospital, Dziekanów Leśny, Poland
| | - Justyna Milczewska
- Cystic Fibrosis Department, Institute of Mother and Child, Warsaw, Poland.,Cystic Fibrosis Centre, Pediatric Hospital, Dziekanów Leśny, Poland
| | - Dorota Sands
- Cystic Fibrosis Department, Institute of Mother and Child, Warsaw, Poland.,Cystic Fibrosis Centre, Pediatric Hospital, Dziekanów Leśny, Poland
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Gur M, Masarweh K, Toukan Y, Nir V, Bar-Yoseph R, Hanna M, Manor E, Hakim F, Bentur L. Six-minute walk, lung clearance index, and QOL in bronchiolitis obliterans and cystic fibrosis. Pediatr Pulmonol 2019; 54:451-456. [PMID: 30575341 DOI: 10.1002/ppul.24223] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Revised: 11/18/2018] [Accepted: 11/21/2018] [Indexed: 11/07/2022]
Abstract
INTRODUCTION The 6-min walk test (6MWT) predicts outcome in pulmonary hypertension. Recently, its use was reported in both cystic fibrosis (CF) and bronchiolitis obliterans (BO). While the 6MWT is a simple, non-invasive and inexpensive tool, lung clearance index (LCI) measurement requires expensive equipment and expertise. We aimed to evaluate 6MWT in BO and CF, and to compare to MBW (multiple breath washout), pulmonary function tests and quality of life (QOL). METHODS A prospective single center study assessing 6MWT, MBW, spirometry, whole-body plethysmography and QOL (SF-36 questionnaire) in BO and CF patients and correlations between them. RESULTS Thirty-three BO patients and 37 CF patients. LCI was significantly higher in BO (12.4 ± 4.2 vs 10.5 ± 3.4, P = 0.044) while FEF 25-75% was significantly lower in BO (43.9 ± 24.4 vs 60.8 ± 30.8, P = 0.014). 6MWD was 474.8 ± 76.3 in BO and 506.6 ± 70 in CF (P > 0.05). There was no correlation between 6MWD and LCI in these small study groups There were few correlation between spirometry prameters and 6MWD. In CF, SF-36 scores correlated with pulmonary functions. CONCLUSIONS The 6MWT is an easy-to-perform test that may be helpful in chronic lung diseases in regions with limited resources. However,with the current limited data, 6MWT cannot replace LCI or spirometry as a marker of disease progression. Is is suggested that, together with QOL, the 6MWT may provide a global estimation of the physiological and general well-being of these patients. Further larger multi-center studies are warranted to evaluate the correlations of 6MWT with pulmonary physiology parameters in various chronic diseases.
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Affiliation(s)
- Michal Gur
- Pediatric Pulmonary Institute and CF Center, Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
- Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Kamal Masarweh
- Pediatric Pulmonary Institute and CF Center, Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
| | - Yazeed Toukan
- Pediatric Pulmonary Institute and CF Center, Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
- Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Vered Nir
- Pediatric Pulmonary Institute and CF Center, Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
| | - Ronen Bar-Yoseph
- Pediatric Pulmonary Institute and CF Center, Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
| | - Moneera Hanna
- Pediatric Pulmonary Institute and CF Center, Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
| | - Eynav Manor
- Pediatric Pulmonary Institute and CF Center, Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
| | - Fahed Hakim
- Pediatric Pulmonary Institute and CF Center, Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
- Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Lea Bentur
- Pediatric Pulmonary Institute and CF Center, Rappaport Children's Hospital, Rambam Health Care Campus, Haifa, Israel
- Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
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46
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Smith CJ, Spaeder MC, Sorkness RL, Teague WG. Disparate diagnostic accuracy of lung function tests as predictors of poor asthma control in children. J Asthma 2019; 57:327-334. [PMID: 30663912 DOI: 10.1080/02770903.2019.1566471] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Rationale: In practice, asthma control is assessed according to symptom burden and office spirometry. However, spirometry poorly tests peripheral lung function, which may be abnormal in asthma. Impluse oscillometry (IOS) and multiple-breath washout (MBW) are novel methods which measure reactance (X5) and ventilation heterogeneity (VH) in the peripheral lung, but how well these tests reflect asthma control is poorly understood. Objective: To compare the diagnostic accuracy of tests of large airways caliber (FEV1, FEV1/FVC, R20), peripheral zone properties (X5, VH), and airways inflammation (FeNO) as predictors of poor control in asthmatic children (44 poorly controlled/10 controlled). Methods: 54 children enriched in severe asthma completed a symptom-based control scale (ACT/cACT) and lung function tests after overnight bronchodilator withhold. The accuracy of each variable to predict poor control was ranked by area under the receiver operating characteristic (ROC) curve, sensitivity and specificity. Results: Among measures of large airways caliber, the FEV1% had the highest ROC curve area, with low sensitivity but perfect specificity. Among measures of peripheral lung function, X5 and VH in the conducting zone had fair curve areas with higher sensitivity but lower specificity compared to the FEV1%. VH in the acinar zone and FeNO both had poor accuracy. Conclusion: Tests of large airway and peripheral zone lung function performed disparately as predictors of poor control in a sample of children enriched in severe asthma. Further studies in a larger sample with more diverse phenotypic features are necessary to validate this preliminary conclusion.
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Affiliation(s)
- Clyde J Smith
- Division of Critical Care Medicine, Department of Pediatrics, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Michael C Spaeder
- Division of Critical Care Medicine, Department of Pediatrics, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Ronald L Sorkness
- School of Pharmacy and Departments of Medicine and Pediatrics, University of Wisconsin-Madison, Madison, WI, USA
| | - W Gerald Teague
- Child Health Research Center, Department of Pediatrics, University of Virginia School of Medicine, Charlottesville, VA, USA
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Trinkmann F, Gawlitza J, Künstler M, Schäfer J, Schroeter M, Michels JD, Stach K, Dösch C, Saur J, Borggrefe M, Akin I. Small Airway Disease in Pulmonary Hypertension-Additional Diagnostic Value of Multiple Breath Washout and Impulse Oscillometry. J Clin Med 2018; 7:E532. [PMID: 30544842 DOI: 10.3390/jcm7120532] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 11/28/2018] [Accepted: 12/07/2018] [Indexed: 11/29/2022] Open
Abstract
Airways obstruction is frequent in patients with pulmonary hypertension (PH). Small airway disease (SAD) was identified as a major contributor to resistance and symptoms. However, it is easily missed using current diagnostic approaches. We aimed to evaluate more elaborate diagnostic tests such as impulse oscillometry (IOS) and SF6-multiple-breath-washout (MBW) for the assessment of SAD in PH. Twenty-five PH patients undergoing body-plethysmography, IOS and MBW testing were prospectively included and equally matched to pulmonary healthy and non-healthy controls. Lung clearance index (LCI) and acinar ventilation heterogeneity (Sacin) differed significantly between PH, healthy and non-healthy controls. Likewise, differences were found for all IOS parameters between PH and healthy, but not non-healthy controls. Transfer factor corrected for ventilated alveolar volume (TLCO/VA), frequency dependency of resistance (D5-20), resonance frequency (Fres) and Sacin allowed complete differentiation between PH and healthy controls (AUC (area under the curve) = 1.0). Likewise, PH patients were separated from non-healthy controls (AUC 0.762) by D5-20, LCI and conductive ventilation heterogeneity (Scond). Maximal expiratory flow (MEF) values were not associated with additional diagnostic values. MBW and IOS are feasible in PH patients both providing additional information. This can be used to discriminate PH from healthy and non-healthy controls. Therefore, further research targeting SAD in PH and evaluation of therapeutic implications is justified.
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48
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Racette C, Lu Z, Kowalik K, Cheng O, Bendiak G, Amin R, Dubeau A, Jensen R, Balkovec S, Gustafsson P, Ratjen F, Subbarao P. Lung clearance index is elevated in young children with symptom-controlled asthma. Health Sci Rep 2018; 1:e58. [PMID: 30623093 PMCID: PMC6266588 DOI: 10.1002/hsr2.58] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Revised: 05/11/2018] [Accepted: 05/18/2018] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND Pulmonary function testing has been recommended as an adjunct to symptom monitoring for assessment of asthma control. Lung clearance index (LCI) measures ventilation inhomogeneity and is thought to represent changes in the small airways. It has been proposed as a useful early marker of airway disease in asthmatic subjects, and determining it is feasible in preschool children. This study aims to assess whether LCI remains elevated in symptomatically controlled asthmatic children with a history of severe asthma, compared with healthy controls. A secondary aim was to determine whether the results were consistent across the preschool and school-aged populations. METHODS Using a case-control design, we compared 33 children with currently well-controlled symptoms who had a history of severe asthma, to 45 healthy controls (age 3-15 years) matched by age, height, and sex. We performed multiple breath washout tests using sulfur hexafluoride as a tracer gas, to determine their LCI and Scond values. RESULTS In the overall study, LCI z-score values were on average 0.86 units (95% confidence interval: 0.24-1.47, P = 0.01, t-test) higher in children with a history of severe asthma with current well-controlled symptoms compared with healthy controls. In addition, within the subgroup of preschool children (age ≤ 6), the asthmatic had significantly higher LCI z-score values than their healthy controls peers (mean (SD), 0.57 (2.18) vs -1.10 (1.00), P = 0.03, t-test). Twenty-seven percent (27%; 9/33) of subjects had an LCI value greater than the upper limit of our healthy controls despite being symptom controlled. Amongst preschool children, 5 (42%; 5/12) of the asthmatic children had abnormal LCI at the individual level. CONCLUSIONS LCI is elevated in children with asthma, which may be driven by differences in the preschool population. LCI may be useful in defining preschool asthma endotypes with persistent ventilation inhomogeneity despite symptomatic control.
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Affiliation(s)
- Christine Racette
- Division of Respiratory Medicine, Department of PediatricsHospital for Sick Children and Research InstituteTorontoOntarioCanada
| | - Zihang Lu
- Division of Respiratory Medicine, Department of PediatricsHospital for Sick Children and Research InstituteTorontoOntarioCanada
- Dalla Lana School of Public HealthUniversity of TorontoTorontoOntarioCanada
| | - Krzysztof Kowalik
- Division of Respiratory Medicine, Department of PediatricsHospital for Sick Children and Research InstituteTorontoOntarioCanada
- Department of PhysiologyUniversity of TorontoTorontoOntarioCanada
| | - Olivia Cheng
- Division of Respiratory Medicine, Department of PediatricsHospital for Sick Children and Research InstituteTorontoOntarioCanada
| | - Glenda Bendiak
- Department of PediatricsUniversity of CalgaryCalgaryAlbertaCanada
| | - Reshma Amin
- Division of Respiratory Medicine, Department of PediatricsHospital for Sick Children and Research InstituteTorontoOntarioCanada
| | - Aimee Dubeau
- Division of Respiratory Medicine, Department of PediatricsHospital for Sick Children and Research InstituteTorontoOntarioCanada
| | - Renée Jensen
- Division of Respiratory Medicine, Department of PediatricsHospital for Sick Children and Research InstituteTorontoOntarioCanada
| | - Susan Balkovec
- Division of Respiratory Medicine, Department of PediatricsHospital for Sick Children and Research InstituteTorontoOntarioCanada
| | | | - Felix Ratjen
- Division of Respiratory Medicine, Department of PediatricsHospital for Sick Children and Research InstituteTorontoOntarioCanada
| | - Padmaja Subbarao
- Division of Respiratory Medicine, Department of PediatricsHospital for Sick Children and Research InstituteTorontoOntarioCanada
- Department of PhysiologyUniversity of TorontoTorontoOntarioCanada
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Abstract
Background Lung clearance index (LCI), derived from multiple-breath washout (MBW), is a well-established assessment of ventilation inhomogeneity in cystic fibrosis but has not been widely applied in other conditions characterized by heterogeneous airways disease, such as COPD. The aim of this study was to evaluate the sensitivity, repeatability, and practicality of LCI in patients with COPD. Methods Fifty-four COPD patients completed MBW using nitrogen as the washout tracer gas (MBWN2, measured using an Exhalyzer™ device), spirometry, and plethysmography. Twenty patients repeated MBWN2, MBWSF6 (using a separate Innocor™ gas analyzer to measure washout of the exogenous trace sulphur hexafluoride), and spirometry at a second visit ≥24 hours later. Results Mean (SD) COPD LCI measured by nitrogen washout (LCIN2) was 12.1 (2.2); mean (SD) LCI Z-score 5.8 (2.0). LCIN2 increased across Global Initiative for Obstructive Lung Disease stages 1 to 3 and was abnormal (Z-score >1.65) in all COPD patients, including those with forced expiratory volume in 1 second (FEV1) ≥80% predicted. LCI was repeatable (median intra-test coefficient of variation 4.1%) and reproducible (limits of agreement -1.8 to 1.6) after mean of 16 days. Functional residual capacity (FRC) measurements were significantly greater using nitrogen than SF6 or plethysmography: mean FRC measured by nitrogen washout (FRCN2) 139% predicted versus FRC measured by plethysmography 125% predicted, p<0.0001. Conclusion LCI is most suitable as a measure of early airways disease in COPD in those with well-preserved FEV1, with similar repeatability and limitations to that observed in cystic fibrosis. Using the Exhalyzer system to perform MBWN2, however, appeared to substantially over-read FRC. This discrepancy needs addressing before FRCN2 measurements made using this device can be reliably deployed.
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Affiliation(s)
- Alan S Bell
- The Medicines Evaluation Unit, Wythenshawe Hospital, Manchester, UK.,Division of Infection Immunity and Respiratory Medicine, Faculty of Biology Medicine and Health, University of Manchester, Manchester, UK,
| | | | - Dave Singh
- The Medicines Evaluation Unit, Wythenshawe Hospital, Manchester, UK.,Division of Infection Immunity and Respiratory Medicine, Faculty of Biology Medicine and Health, University of Manchester, Manchester, UK, .,Manchester Academic Health Science Centre, Manchester, UK,
| | - Alexander Horsley
- Division of Infection Immunity and Respiratory Medicine, Faculty of Biology Medicine and Health, University of Manchester, Manchester, UK, .,Manchester Academic Health Science Centre, Manchester, UK, .,Manchester Adult Cystic Fibrosis Centre, Manchester University NHS Foundation Trust, Manchester, UK,
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50
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Mahar RK, Carlin JB, Ranganathan S, Ponsonby AL, Vuillermin P, Vukcevic D. Bayesian modelling of lung function data from multiple-breath washout tests. Stat Med 2018; 37:2016-2033. [PMID: 29582453 DOI: 10.1002/sim.7650] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 10/30/2017] [Accepted: 02/09/2018] [Indexed: 11/10/2022]
Abstract
Paediatric respiratory researchers have widely adopted the multiple-breath washout (MBW) test because it allows assessment of lung function in unsedated infants and is well suited to longitudinal studies of lung development and disease. However, a substantial proportion of MBW tests in infants fail current acceptability criteria. We hypothesised that a model-based approach to analysing the data, in place of traditional simple empirical summaries, would enable more efficient use of these tests. We therefore developed a novel statistical model for infant MBW data and applied it to 1197 tests from 432 individuals from a large birth cohort study. We focus on Bayesian estimation of the lung clearance index, the most commonly used summary of lung function from MBW tests. Our results show that the model provides an excellent fit to the data and shed further light on statistical properties of the standard empirical approach. Furthermore, the modelling approach enables the lung clearance index to be estimated by using tests with different degrees of completeness, something not possible with the standard approach. Our model therefore allows previously unused data to be used rather than discarded, as well as routine use of shorter tests without significant loss of precision. Beyond our specific application, our work illustrates a number of important aspects of Bayesian modelling in practice, such as the importance of hierarchical specifications to account for repeated measurements and the value of model checking via posterior predictive distributions.
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Affiliation(s)
- Robert K Mahar
- Data Science, Murdoch Children's Research Institute, Parkville, Victoria, Australia.,Department of Paediatrics, Faculty of Medicine, Dentistry and Health Services, University of Melbourne, Parkville, Victoria, Australia
| | - John B Carlin
- Data Science, Murdoch Children's Research Institute, Parkville, Victoria, Australia.,Department of Paediatrics, Faculty of Medicine, Dentistry and Health Services, University of Melbourne, Parkville, Victoria, Australia.,Melbourne School of Population and Global Health, Faculty of Medicine, Dentistry and Health Services, University of Melbourne, Parkville, Victoria, Australia
| | - Sarath Ranganathan
- Department of Paediatrics, Faculty of Medicine, Dentistry and Health Services, University of Melbourne, Parkville, Victoria, Australia.,Infection and Immunity, Murdoch Children's Research Institute, Parkville, Victoria, Australia.,Department of Respiratory and Sleep Medicine, Royal Children's Hospital, Parkville, Victoria, Australia
| | - Anne-Louise Ponsonby
- Department of Paediatrics, Faculty of Medicine, Dentistry and Health Services, University of Melbourne, Parkville, Victoria, Australia.,Population Health, Murdoch Children's Research Institute, Parkville, Victoria, Australia
| | - Peter Vuillermin
- Population Health, Murdoch Children's Research Institute, Parkville, Victoria, Australia.,School of Medicine, Faculty of Health, Deakin University, Geelong, Victoria, Australia.,Department of Paediatrics, Barwon Health, Geelong, Victoria, Australia
| | - Damjan Vukcevic
- Data Science, Murdoch Children's Research Institute, Parkville, Victoria, Australia.,School of Mathematics and Statistics, Faculty of Science, University of Melbourne, Parkville, Victoria, Australia
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