Barnard J P, Sleigh J W
Anaesthetic Department, Waikato Hospital, Hamilton, New Zealand.
Br J Anaesth. 1995 Feb;74(2):155-8. doi: 10.1093/bja/74.2.155.
The Datex Capnomac Ultima monitor combines a sidestream rapid gas analyser with a spirometer. In theory the integral of simultaneous flow and oxygen concentration during inspiration is the inspired and expired volume of oxygen. From the difference between these two amounts, oxygen consumption (VO2) can be estimated. VO2 was measured in patients under general anaesthesia and compared with that obtained simultaneously using a Datex Deltatrac metabolic monitor. Two techniques to compensate for the delay in rise time of the oxygen sensor were evaluated. The first method steepened the oxygen curve exponentially, and the second used a linear statistical correction. The linear correlation coefficients for VO2 between the Ultima and the Deltatrac were 0.87 and 0.78 for the two methods. The 10th to 90th centile range for error was -67.4-59.8 ml min-1 for the exponential method and -53.2-56.1 ml min-1 for the statistical method. The Ultima may be used with moderate accuracy to measure oxygen uptake during anaesthesia.
Datex Capnomac Ultima监护仪将旁流式快速气体分析仪与肺活量计结合在一起。理论上，吸气过程中同步气流和氧浓度的积分就是吸入和呼出的氧气量。根据这两个量之间的差值，可以估算出氧耗量（VO2）。对全身麻醉患者的VO2进行了测量，并与同时使用Datex Deltatrac代谢监护仪获得的结果进行了比较。评估了两种补偿氧传感器上升时间延迟的技术。第一种方法是使氧曲线呈指数变陡，第二种方法是使用线性统计校正。两种方法下，Ultima与Deltatrac之间VO2的线性相关系数分别为0.87和0.78。指数法的误差第10至第90百分位数范围为-67.4-59.8 ml·min-1，统计法为-53.2-56.1 ml·min-1。Ultima可用于在麻醉期间以中等精度测量氧摄取量。
