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Lung clearance index in healthy volunteers, measured using a novel portable system with a closed circuit wash-in.


ABSTRACT: INTRODUCTION:Lung clearance index (LCI) is a sensitive measure of early lung disease, but adoption into clinical practice has been slow. Challenges include the time taken to perform each test. We recently described a closed-circuit inert gas wash-in method that reduces overall testing time by decreasing the time to equilibration. The aim of this study was to define a normative range of LCI in healthy adults and children derived using this method. We were also interested in the feasibility of using this system to measure LCI in a community setting. METHODS:LCI was assessed in healthy volunteers at three hospital sites and in two local primary schools. Volunteers completed three washout repeats at a single visit using the closed circuit wash-in method (0.2% SF6 wash-in tracer gas to equilibrium, room air washout). RESULTS:160 adult and paediatric subjects successfully completed LCI assessment (95%) (100 in hospital, 60 in primary schools). Median coefficient of variation was 3.4% for LCI repeats and 4.3% for FRC. Mean (SD) LCI for the analysis cohort (n = 53, age 5-39 years) was 6.10 (0.42), making the upper limit of normal LCI 6.8. There was no relationship between LCI and multiple demographic variables. Median (interquartile range) total test time was 18.7 (16.0-22.5) minutes. CONCLUSION:The closed circuit method of LCI measurement can be successfully and reproducibly measured in healthy volunteers, including in out-of-hospital settings. Normal range appears stable up to 39 years. With few subjects older than 40 years, further work is required to define the normal limits above this age.

SUBMITTER: Horsley AR 

PROVIDER: S-EPMC7041809 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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Lung clearance index in healthy volunteers, measured using a novel portable system with a closed circuit wash-in.

Horsley Alex R AR   Alrumuh Amnah A   Bianco Brooke B   Bayfield Katie K   Tomlinson Joanne J   Jones Andrew A   Maitra Anirban A   Cunningham Steve S   Smith Jaclyn J   Fullwood Catherine C   Pandyan Anand A   Gilchrist Francis J FJ  

PloS one 20200225 2


<h4>Introduction</h4>Lung clearance index (LCI) is a sensitive measure of early lung disease, but adoption into clinical practice has been slow. Challenges include the time taken to perform each test. We recently described a closed-circuit inert gas wash-in method that reduces overall testing time by decreasing the time to equilibration. The aim of this study was to define a normative range of LCI in healthy adults and children derived using this method. We were also interested in the feasibilit  ...[more]

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