Intravascular mixed venous oxygen tension monitoring. An analysis of electrode performance in 100 patients.
A lengthened umbilical artery catheter incorporating an oxygen electrode (Searle) was flow-guided to the pulmonary artery in 48 out of 62 attempts (77.4%). In the last 70 catheters used, electrode performance was evaluated over a total of 3687 h by comparison with an ABL2 (Radiometer) blood-gas analyser; 654 comparisons were made, of which 255 resulted in recalibration of the electrode output. When sampling intervals were within 6 h, in more than 80% of the comparisons the difference between in vivo and in vitro measurement was within +/- 0.4 kPa (+/- 3 mm Hg). Twenty-four electrodes were removed sooner than clinically indicated (mean useful life 48.5 h) because of failure of oxygen or pressure measurements.
D001784:Blood Gas Analysis / Q000379:methods; D002138:Calibration; D002404:Catheterization; D004566:Electrodes / Q000592:standards; D006801:Humans; D008991:Monitoring, Physiologic / Q000592:standards; D010100:Oxygen / Q000097:blood*; D011651:Pulmonary Artery; D013997:Time Factors
D010100:Oxygen