Compliance Distensibility(stretchability) Ease with which the lungs can expand The compliance is inversely proportional to elastic resistance Change in lung volume per change in transpulmonary pressure △V/P 100 x more distensible than a balloon Specific compliance(比顺应性):the compliance per unit volume 16
16 Compliance • Distensibility (stretchability): – Ease with which the lungs can expand. – The compliance is inversely proportional to elastic resistance • Change in lung volume per change in transpulmonary pressure. DV/DP • 100 x more distensible than a balloon. • Specific compliance (比顺应性）: the compliance per unit volume
Static lung compliance C=△V/AP 100 deflation Lung volume 50 (%TLC) orm breathing inflation 0 0 Transpulmonary 30 pressure(cmH2O) 7
17 0 100 50 0 30 Lung volume (%TLC) Transpulmonary pressure (cmH2O) Static lung compliance C = DV/DP inflation deflation normal breathing