Bennett D, Burnside J, Langwell J, Beckley P D
Department of Cardiovascular Perfusion, Children's Hospital, Columbus, Ohio 43205.
J Extra Corpor Technol. 1993;25(4):140-4.
Continuous venous oxygen saturation and hematocrit values are important parameters in assessing patient status while on cardiopulmonary bypass. Two devices used to measure continuous venous oxygen saturation while on cardiopulmonary bypass were compared to a control. The Bentley Oxysat meter and the Medtronic MX2 Oxygen Saturation and Hematocrit System were compared to the ABL500 blood gas monitor. The continuous hematocrit readings from the MX2 system were compared to spun hematocrits. Twenty-nine pediatric patients ranging from 2.3kg-43.3kg were randomly selected. In-line optical transmission cells used were 1/4" or 3/8" depending upon the patient's blood flow requirements. A total of 163 data points were analyzed at different blood flow rates, temperatures, and hematocrits. The venous oxygen saturation values obtained from the Oxysat and the MX2 devices correlated well with the ABL500 over the entire range of blood flows, temperatures, and hematocrits. All correlation coefficients were greater than 0.89. The correlation between the MX2 device and the spun hematocrit varied with temperature ranges. The correlation coefficient tended to decrease with decreasing temperature. We conclude that these devices are important adjuncts to bypass as long as their limitations are understood.
在体外循环期间，连续静脉血氧饱和度和血细胞比容值是评估患者状态的重要参数。将用于测量体外循环期间连续静脉血氧饱和度的两种设备与一种对照设备进行了比较。将本特利血氧饱和度仪和美敦力MX2血氧饱和度及血细胞比容系统与ABL500血气监测仪进行了比较。将MX2系统的连续血细胞比容读数与离心后的血细胞比容进行了比较。随机选取了29名体重在2.3千克至43.3千克之间的儿科患者。根据患者的血流需求，使用的在线光传输单元为1/4英寸或3/8英寸。在不同的血流速率、温度和血细胞比容下，共分析了163个数据点。在整个血流、温度和血细胞比容范围内，从血氧饱和度仪和MX2设备获得的静脉血氧饱和度值与ABL500的相关性良好。所有相关系数均大于0.89。MX2设备与离心后的血细胞比容之间的相关性随温度范围而变化。相关系数倾向于随着温度降低而减小。我们得出结论，只要了解这些设备的局限性，它们就是体外循环的重要辅助工具。
