俯卧位可使许多呼吸窘迫综合征(ARDS)患者的气体交换得到改善。动物实验表明 ,转为俯卧位可使背侧肺通气恢复 ,而腹侧肺压迫并不明显。为了探讨俯卧位改善气体交换的机理 ,作者测量了 7例患者仰卧位与俯卧位状态下位于心脏下区的肺容积。方法　 7例均为健康成人 ,无肺实质疾患 Prone position can improve the gas exchange in many respiratory distress syndrome (ARDS) patients. Animal experiments show that to the prone position can make the dorsal lung ventilation recovery, and ventral lung compression is not obvious. In order to explore the mechanism of prone position to improve gas exchange, the authors measured lung volume in the lower heart region in the supine and prone position of seven patients. Methods All 7 cases were healthy adults without pulmonary parenchymal disease