两点没看明白

Venous admixture is calculated from the shunt equation, which assumes that the oxygen content of arterial blood equals the sum of content in the deoxygenated blood passing through the shunt and ‘ideally’ oxygenated blood passing through lung. To solve the equation, mixed venous oxygen content needs to be measured or assumed, and ideal alveolar Po2 calculated and converted into the oxygen content of pulmonary endcapillary blood. Physiological shunt is normally only a few percent of total cardiac output. The effect of varying levels of shunt on arterial oxygenation depends on the source of the shunt, but administration of oxygen to a patient will only correct the shunt caused by areas of lung with a V˙/Q˙ ratio less than 1 but greater than 0.

静脉血掺杂是通过分流方程计算出来的，该方程假设动脉血氧含量等于分流的未氧合血和肺的“理想肺泡”氧合血的氧含量之和。为了求解方程，需要测量或假设混合静脉氧含量，计算出理想肺泡的PO₂，并将其转化为肺毛细血管内的血氧含量。生理性分流通常只占总心输出量的百分之几。不同程度的分流对动脉氧合的影响取决于分流的来源，但给患者氧疗只能纠正V/Q比例小于1但大于0的肺区域引起的分流。

1.mixed venous oxygen content needs to be measured or assumed, and ideal alveolar Po2 calculated and converted into the oxygen content of pulmonary endcapillary blood. 是3个并列，

还是“mixed venous oxygen content needs to be measured or assumed”与“ideal alveolar Po2 calculated and converted into the oxygen content of pulmonary endcapillary blood”，然后“ideal alveolar Po2 calculated”与“converted into the oxygen content of pulmonary endcapillary blood”并列

2.不同程度的分流对动脉氧合的影响取决于分流的来源？我怎么觉得分流对动脉氧合的影响只与程度有关，与来源无关