样本稀释对动脉血气测定的影响。
Effect of sample dilutions on arterial blood gas determinations.
作者信息
Dennis R C, Ng R, Yeston N S, Statland B
出版信息
Crit Care Med. 1985 Dec;13(12):1067-8. doi: 10.1097/00003246-198512000-00018.
A study was undertaken to determine the blood gas effects of incompletely purging heparinized saline flush solution from an indwelling arterial catheter and pressure tubing. Hematocrit and blood gases were measured after withdrawing 0, 2, 4, 6, 8, and 10 ml of flush-blood solutions before sampling from a 20-ga radial artery catheter and 7-ft pressure tubing and stopcock. The pH and hematocrit were nearly unchanged between purging volumes of 8 and 10 ml. The PaO2 had a 2.4% error, while the PaCO2 had a 4.4% error. Because there is no standard arterial line setup, it is recommended that each ICU undertake a similar study to determine the optimal volume of aspirated flush-blood solution before blood gas sampling, in order to achieve accurate blood gas results and minimize blood waste.
开展了一项研究，以确定从留置动脉导管和压力管路中不完全清除肝素化盐水冲洗液对血气的影响。在从20号桡动脉导管、7英尺长的压力管路和旋塞阀中取样前，分别抽取0、2、4、6、8和10毫升冲洗血溶液后，测量血细胞比容和血气。在冲洗量为8至10毫升之间时，pH值和血细胞比容几乎没有变化。动脉血氧分压（PaO2）有2.4%的误差，而动脉血二氧化碳分压（PaCO2）有4.4%的误差。由于没有标准的动脉管路设置，建议每个重症监护病房（ICU）进行类似研究，以确定血气采样前抽取冲洗血溶液的最佳量，从而获得准确的血气结果并尽量减少血液浪费。
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