[Measurement and clinical use of recoil pressure of the respiratory system].
Using the principle that the difference of MIP (maximal inspiratory mouth pressure) between RV (residual volume) and FRC (functional residual capacity) equals Prs (recoil pressure of the respiratory system) at RV, we performed the measurement of Prs at RV in 20 normal subjects, 90 patients with COPD (chronic obstructive pulmonary disease) and 15 patients with ILF (interstitial lung fibrosis). We also performed the correlation analysis of Prs at RV and RV/TLC (total lung capacity) %. The results indicated the Prs values at RV (-2.8 +/- 0.5 kPa) in normal subjects measured in this manner was in accord with the values reported by other authors abroad. The Prs in patients with emphysema decreased and it was highly and negatively correlated with RV/TLC% (r = -0.872), but the Prs in patients with ILF was increased. The results suggest that this method for measurement of Prs is simple, reliable, and clinically useful.
Wang
Y
Y
Department of Internal Medicine, WCUMS, Chengdu 610041.
Luo
Y
Y
Yuan
Y
Y
He
T
T
Zeng
J
J
D000368:Aged; D005260:Female; D005652:Functional Residual Capacity; D006801:Humans; D008297:Male; D008449:Maximal Expiratory Flow-Volume Curves / Q000502:physiology*; D008875:Middle Aged; D011312:Pressure; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology*; D011658:Pulmonary Fibrosis / Q000503:physiopathology; D012123:Pulmonary Ventilation / Q000502:physiology*; D012119:Respiration; D012129:Respiratory Function Tests