【急诊每日一题】2013年4月22日【超声测量下腔静脉直径】
Recently, the ultrasonographic measurement of the diameter of IVC to detect hypovolemiahas become popular. Why does the dIVC reflect volume status more closely thanother parameters based on the arterial system, such as BP and heart rate?

最近，用超声测量下腔静脉的直径来判断血容量不足已被广泛接受。为什么下腔静脉直径反映容量状态要比其他参数，如反应动脉系统的血压和心率更加敏感和准确？

TheAnswer is 答案是：

The dIVC has not been found to be affected by the body's compensatoryvasoconstrictor response to volume loss. Hence, it reflects volume status moreclosely than other parameters based on the arterial system (JEM, ePub, Onlie4/19/13).

目前还没有发现下腔静脉直径受到机体对容量损失所产生的代偿性血管收缩反应的影响。因此，它反映容量状态要比其它反应动脉系统的指标更加敏感和准确 (JEM, ePub, Online 4/19/13)。