Pulmonary function measurement
All children were tested for pulmonary function on the day of the
physical examination. Pulse oscillations (first) and pulmonary
ventilation (second) were also measured. If ventilation function is
abnormal, pulse data will not be used. The Masterscreen IOS lung
function detector from Yager Company in Germany is adopted and operated
by specially trained lung function technicians.
All operations and procedures are in accordance with ATS (American
Thoracic Society, ATS), the European Respiratory Society (European
Respiratory Society, ERS) and the Chinese children’s lung function
testing guidelines recommending [1-4], The
specific operations are as follows: 1 minute to collect data, display VT
and RF constant volume-time curve, FRC is smooth, the impedance spectrum
repeatability is good, Zrs, Rrs, Xrs, and Fres stability, at least three
times the acceptable data.