Angle β of greater than 80° at the start of spirometry may identify high‐quality flow volume curves

ABSTRACT Background and objective The American Thoracic Society (ATS) and European Respiratory Society (ERS) emphasize a satisfactory start in maximal expiratory flow–volume (MEFV) curves and highlight subjective parameters: performance without hesitation and expiration with maximum force. We descri...

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Bibliographic Details
Published in:Respirology (Carlton, Vic.) Vic.), 2017-04, Vol.22 (3), p.527-532
Main Authors: Lian, Ningfang, Li, Li, Ren, Weiying, Jiang, Zhilong, Zhu, Lei
Format: Article
Language:English
Subjects:
Adult
Aged
Aged, 80 and over
Anthropometry
Exhalation
Female
Humans
Lung Diseases, Obstructive - physiopathology
Male
Maximal Expiratory Flow-Volume Curves
maximal expiratory flow–volume curve
Middle Aged
pulmonary function tests
Quality
quality control
Respiratory diseases
Respiratory function
Spirometry
spirometry standardization
Thorax
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Summary:ABSTRACT Background and objective The American Thoracic Society (ATS) and European Respiratory Society (ERS) emphasize a satisfactory start in maximal expiratory flow–volume (MEFV) curves and highlight subjective parameters: performance without hesitation and expiration with maximum force. We described a new parameter, angle β for characterization of the start to the MEFV curve. Methods Subjects completed the MEFV curve at least three times and at least two curves met ATS/ERS quality. Subjects were divided into normal, restrictive and obstructive groups according to pulmonary function test results. The tangent line was drawn at the start of the MEFV curve's ascending limb to the x‐axis and the angle β between the tangent line and x‐axis was obtained. The relationships between tangent of β, pulmonary function parameters (PFPs) and anthropometric data were assessed. The MEFV curves with insufficient explosion at the start were considered as poor‐quality MEFV curves. Results In 998 subjects with high‐quality spirometry, although PFP varied in relation to the three aspects: the angle β and its tangent were similar (P > 0.05), the tangent of β did not correlate with PFP or anthropometric measurements (P > 0.05) and the lower limit of normal (LLN) of the angle β was 80° in the group with high‐quality spirometry (P 
ISSN:1323-7799
1440-1843
DOI:10.1111/resp.12950