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肺循环阻力约为体循环的1/2,正常肺动脉(PA)平均压仅12±2毫米汞柱,左房平均压为6±2毫米汞柱;因而肺循环前后压力阶差仅6毫米汞柱。肺毛细管前小动脉的中层较体循环肌性小动脉中层为薄,这是造成肺血管床低阻抗状态的原因。由于肺循环的
Respiratory resistance was about 1/2 of that of systemic circulation. The mean PA of the normal pulmonary artery (PA) was only 12 ± 2 mmHg and the mean left atrial pressure was 6 ± 2 mmHg. The pressure gradient before and after pulmonary circulation was only 6 mmHg. Pulmonary capillary anterior arterioles than the middle of the systemic arteriolar middle of the thin, which is the cause of the pulmonary vascular bed low impedance state. Due to pulmonary circulation