Examination of Maximum Transdiaphragmatic Pressure, Diaphragm Electromyography in Patients with Obstructive Emphysema

This paper reported the methods and results of maximum transdiaphragmatic pressure (Pdi max) and diaphragm electromyography (EMGdi) in 16 patients with obstructive emphysema. A correlation analysis showed that Pdi max is negatively related to Paco₂ FRC%, and positively to VC, IG, FVC and MVV closely. Diaphragmatic fatigue was induced by inspiratory resistive loaded breathing with the parameters of 60% Pdi max and 5 minutes lasting. The influencial effecta and clinical value of diaphragm examination were discussed.