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J Cyst Fibros. 2014 May;13(3):319-27. doi: 10.1016/j.jcf.2013.11.006. Epub 2013 Dec 12.

The impact of switching to the new global lung function initiative equations on spirometry results in the UK CF registry.

Author information

1
Hospital for Sick Children, Toronto, Canada. Electronic address: Sanja.Stanojevic@sickkids.ca.
2
UCL Institute of Child Health, London, UK.
3
UCL Institute of Child Health, London, UK; Great Ormond Street Hospital for Children NHS Trust, London, UK.
4
Royal Victoria Infirmary, Newcastle upon Tyne, UK.
5
Royal Brompton Hospital, London, UK.
6
Cystic Fibrosis Trust (UK), London, UK.
7
Great Ormond Street Hospital for Children NHS Trust, London, UK.
8
Seattle Children's Hospital, Seattle, WA, USA.

Abstract

BACKGROUND:

The Quanjer et al. Global Lung Function Initiative (GLI)-2012 multi-ethnic all-age reference equations for spirometry are endorsed by all major respiratory societies and are the new gold standard. Before the GLI equations are implemented for use in CF patients, the impact of changing equations from those currently used needs to be better understood.

METHODS:

Annual review data submitted to the UK CF Trust Registry between 2007 and 2011 were used to calculate %predicted FEV1, FVC and FEV1/FVC using three widely used reference equations (Wang-Hankinson and Knudson) and the new GLI-2012 equations.

RESULTS:

Overall, Knudson and Wang equations overestimated %predicted values in paediatric patients, such that a greater proportion of patients had lung function values in the normal range. Within individual patients, the impact of switching equations varied greatly depending on the patients' age, and which equations were used.

CONCLUSIONS:

A unified approach to interpreting spirometric lung function measurements would help facilitate more appropriate comparison both within and between centres and countries. Interpretation of longitudinal measurements using a continuous reference equation across all-ages, like the GLI, may further improve our understanding of CF lung disease.

KEYWORDS:

Cystic fibrosis; Reference values; Spirometry

PMID:
24332996
DOI:
10.1016/j.jcf.2013.11.006
[Indexed for MEDLINE]
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