Objective:To determine the changes of right ventricular outflow tract(RVOT) hemodynamics in cases of COPD and discuss their relations with pulmonary artery pressure (PAP).

• 目的：利用多普勒超声心动图检测慢性阻塞性肺部疾病患者的右室流出道(RVOT)血流动力学变化，并试图讨论其与肺动脉压的联系。