Abstract
Two commercially available umbilical artery catheters (Invivox and Neocath 1000) which are capable of continuously monitoring PaO2 were evaluated. The catheters use Clark electrodes to measure oxygen within the aorta of critically ill newborn infants. Accuracy when compared to arterial blood gas analysis, frequency of recalibration, and working life were evaluated. The Invivox catheter correlates with the measured ABG (r =. 86, R2 =. 75), required recalibration 48.60% of matched measurements and lasted for a mean of 79.70 hr. The Neocath catheter correlated with the measured ABG (r =. 88, R2 =. 79), required recalibration 34.54% of match measurements and lasted for a mean of 101.15 hr. These catheters require frequent recalibration, had shorter longevity than a comparable end hole catheter, and cannot be wired for replacement, which may make then undesirable for monitoring PaO2 in critically ill newborn infants.
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