肺动脉压力(pulmonary artery pressure,PAP)反映右侧心腔和血管的压力变化。正常肺动脉收缩压20~30mmHg,等于右心室收缩压。肺动脉压力降低见于:①低血容量。肺动脉或肺动脉瓣狭窄. ......