Comparison of different analysis algorithms to calculate multiple-breath washout outcomes.

Anagnostopoulou, Pinelopi; Kranz, Nadja; Wolfensberger, Jeremias Max; Guidi, Marisa; Nyilas, Sylvia Meryl; Koerner-Rettberg, Cordula; Yammine, Sophie; Singer, Florian; Latzin, Philipp (2018). Comparison of different analysis algorithms to calculate multiple-breath washout outcomes. ERJ Open Research, 4(3) European Respiratory Society 10.1183/23120541.00021-2017

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Lung clearance index (LCI) is the main outcome of the multiple-breath washout (MBW) test. Current recommendations for LCI acquisition are based on low-grade evidence. The aim of this study was to challenge those recommendations using alternative methods for LCI analysis. Nitrogen MBW measurements from school-aged children, 20 healthy controls, 20 with cystic fibrosis (CF) and 17 with primary ciliary dyskinesia (PCD), were analysed using 1) current algorithms (standard), 2) three alternative algorithms to detect with higher precision the end of MBW testing and 3) two alternative algorithms to determine exhaled tracer gas concentrations. LCI values, intra-test repeatability, and ability to discriminate between health and lung disease were compared between these methods. The analysis methods strongly influenced LCI (mean±sd overall differences (%) between standard and alternative analysis methods: -4.9±5.7%; range: -66-19%), but did not improve intra-test variability. Discrimination between health and disease was comparable as areas under the receiver operator curves were not greater than that from standard analysis. This study supports current recommendations for LCI calculation in children. Alternative methods influence LCI estimates and hamper comparability between MBW setups. Alternative algorithms, whenever used, should be carefully reported.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic, Interventional and Paediatric Radiology
04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine
04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine > Paediatric Pneumology

Graduate School:

Graduate School for Cellular and Biomedical Sciences (GCB)

UniBE Contributor:

Anagnostopoulou, Pinelopi; Kranz, Nadja; Wolfensberger, Jeremias Max; Nyilas, Sylvia Meryl; Yammine, Sophie; Singer, Florian and Latzin, Philipp

Subjects:

600 Technology > 610 Medicine & health

ISSN:

2312-0541

Publisher:

European Respiratory Society

Language:

English

Submitter:

Romy Melanie Rodriguez Del Rio

Date Deposited:

09 Jan 2019 08:51

Last Modified:

09 Jan 2019 08:53

Publisher DOI:

10.1183/23120541.00021-2017

PubMed ID:

30023402

Additional Information:

Both authors, Pinelopi Anagnostopoulou & Nadja Kranz, contributed equally.

BORIS DOI:

10.7892/boris.120756

URI:

https://boris.unibe.ch/id/eprint/120756

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