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British Journal of Anaesthesia, 1981, Vol. 53, No. 1 89-96
© 1981 The Board of Management and Trustees of the British Journal of Anaesthesia

research-article

INTRAVASCULAR MIXED VENOUS OXYGEN TENSION MONITORING

An analysis of electrode performance in 100 patients

R. F. ARMSTRONG, M.B., B.S., F.F.A.R.C.S., J. MOXHAM, B.SC., M.R.C.P., S. L. COHEN, M.B., B.S., F.R.C.P. and C. J. VALLIS, B.SC., M.B., B.S., F.F.A.R.C.S.

University College Hospital Gower Street, London WC1
Medical Unit, University College Hospital Medical School

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.


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