摘要
目前,塑料注射器是最常用来收集动脉血液的。这些注射器的动脉血氧张力(Pa,O2)可能下降。我们研究了注射器类型、新陈代谢和储存时间对测量的动脉血氧压和计算的肺分流管的影响。10例患者在冠状动脉旁路手术2-3小时后进行了100%氧测试。随机抽取每位患者的四份动脉血气样本,两份用玻璃注射器,两份用塑料注射器。1只玻璃杯和1只塑料注射器保存在室温下(RT),其余保存在冰水中(IW)。每个样本都要尽快进行分析,采样后分别重复15、30、60、120分钟。取样后尽快测量IW中玻璃注射器血液中Pa、O2被认为是“金标准”。利用各种血气分析的结果进行肺分流术的计算。与“金标准”相比,其他方法的Pa、O2测定均有显著下降。 The effect due to diffusion was 0.05 kPa x min(-1), and that due to metabolism 0.11 kPa x min(-1). The Pa,O2 in the glass syringes stored in IW remained stable with time. The pulmonary shunt was significantly overestimated when the "gold standard" blood gas results were not used (range 0.8-9.9%). Glass (not plastic) syringes should be used in the 100% oxygen test. The syringe should be cooled immediately, even when the sample is analysed as soon as possible.