Oxygen saturation and lactate concentration gradient from the right atrium to the pulmonary artery in the immediate postoperative following cardiac surgery with extracorporeal circulation

ABSTRACT Objective: This prospective study aimed to characterize the changes in blood lactate concentration and blood oxygen saturation in patients during the immediate postoperative period of cardiac surgery with extracorporeal circulation. Methods: Blood samples were collected from 35 patients in a rapid and random order from the arterial line and from the proximal and distal port of a pulmonary artery catheter. Results: The results showed no statistically significant differences between the blood oxygen saturation in the right atrium (72% ± 0.11%) and the blood oxygen saturation in the pulmonary artery (71% ± 0.08%). The blood lactate concentration in the right atrium was 1.7mmol/L ± 0.5mmol/L, and the blood lactate concentration in the pulmonary artery was 1.6mmol/L ± 0.5mmol/L (p

摘要
研究目的：本前瞻性研究旨在阐明接受体外循环（extracorporeal circulation）心脏手术的患者术后即刻阶段的血乳酸浓度（blood lactate concentration）与血氧饱和度（blood oxygen saturation）变化特征。
方法：本研究纳入35例患者，采用快速随机采样方式，分别从动脉管路以及肺动脉导管（pulmonary artery catheter）的近端与远端端口采集血样。
结果：研究结果显示，右心房（right atrium）血氧饱和度（72% ± 0.11%）与肺动脉（pulmonary artery）血氧饱和度（71% ± 0.08%）之间无统计学显著性差异；右心房血乳酸浓度为1.7mmol/L ± 0.5mmol/L，肺动脉血乳酸浓度为1.6mmol/L ± 0.5mmol/L（p