iPFT performance
Included in the study were iPFT measurements that met the American
Thoracic Society/European Respiratory Society criteria11,12,19. In all SARS-CoV-2 cases included in the
study, all iPFT performed were acceptable. Tidal breathing measurements
and tidal forced expiratory flow-volume curves for V̇maxFRC measurements
were acceptable in 471 (99%) of control subjects. Raised-volume rapid
thoracoabdominal compression allowing measurements of maximal expiratory
flow-volume loops (FVC, FEV0.5 FEF75%and FEF85%) were acceptable in 455 (96%) of control
subjects and calculation of RV and TLC were acceptable in 428 (90%) of
control subjects.