【摘要】 <正> 生理分流,指的是一部分的右心排出血液未经氧化即回到左心,也就是说这一部分血液流经了不通气或通气不足的肺泡。这一部分血量称之为分流量((?)s)。正常人西(?)s 相当于心排血量((?)T)的2%左右,而且变异不大。生理分流包括恒量解剖分流和变量毛细血流部分,其组成参看表一、附图。更多还原

【Abstract】 Physiological shunt determination were performed in 23 normal persons and 57patients with cardiac disorders.In the 23 normal persons after inspiring FIO₂ 100 the average blood PaO₂ was 646mmHg;D_A-aO₂ 26 mmHg and Q_S/Q_T 1.5%.Causes of increased Q_S/Q_T in thoracic clinic diseases were discussed.The shuntwas classified into three types:increased pulmonary blood flow,pulmonary bloodcongestion and decreased pulmonary blood flow;and these conditions were explainedwith examples of individual patients.The shunt determination matched about 86%with the findings in the operations.In 12 patients the shunt was re-examined after operation,all reflected sensitivelypostoperative results.The shunt determination could be used as an index of effec-tiveness before and after operation.It seemed to be more sensitive than the diffu-sion rate in rheumatic patients.It is advantageous in its simplicity,high reliabilityand high reproducibility,hence can be recommended as a valuagle method in clinicalapplication.更多还原