Why the study?
Does continuous monitoring with an in-line oxygen electrode accurately measure blood PO2 compared to intermittent blood gas analyser measurements in patients undergoing cardiac surgery?
Does continuous monitoring with an in-line oxygen electrode accurately measure blood PO2 compared to intermittent blood gas analyser measurements in patients undergoing cardiac surgery?
Continuous in-line venous PO2 monitoring during cardiopulmonary bypass shows a small mean difference compared to intermittent blood gas analysis, whereas arterial PO2 monitoring shows a larger discrepancy due to rapid changes.
Arterial in-line PO2 shows substantial bias versus blood gas analysis; leaves open reliability of continuous monitoring in cardiac surgery.
In 46 patients undergoing cardiac surgery blood PO2 was continuously monitored with an in-line oxygen electrode during cardiopulmonary bypass and readings were compared with intermittent measurements of samples on a blood gas analyser. In 35 patients in whom arterial PO2 was monitored, there were rapid changes in PO2 and the mean difference between the in-line electrode and the blood gas analyser was 6.63 kPa (p less than 0.001). Venous PO2 was monitored in 11 patients and, in contrast to the arterial readings, the venous PO2 was relatively stable. The mean difference between the in-line electrode readings and the blood gas analyser was 0.21 kPa (p less than 0.05). The advantages of continuous monitoring of blood PO2 are described and the relative merits of mixed venous PO2 and mixed venous oxygen saturation measurements are discussed.
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Claremont et al. (1985) studied this question.
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