Clinical comparison of one in vitro and three in-line blood gas P(O2) sensors during cardiopulmonary bypass

Abstract
During 17 cardiopulmonary bypass (CPB) operations, arterial PO2 measurements were taken at 5 min intervals using four different types of PO2 sensor; three in-line (CardioMet-1000, Polytrode, and Gas-Stat) and one blood gas analyser (IL-1302). Comparisons between sensors were made relative to the CardioMet-1000. The three in-line sensors showed close agreement. The mean and standard deviation of the difference between the Gas-Stat and the CardioMet-1000 was 0.7 .+-. 4.7 kPa, and between the Polytrode and the CardioMet-1000 was -1.4 .+-. 4.0 kPa. Agreement between the IL-1302 blood gas analyser and CardioMet-1000 was not as good, the difference being -7.0 .+-. 8.6 kPa.