Reliability of transcutaneous monitoring of arterial Po2 in newborn infants

Blood Po₂ was measured transcutaneously on skin `arterialized9 by means of a heated Po₂ electrode. Oxygen diffuses through the relatively thin skin of newborn infants from the outer capillary layer to an electrode fixed to the skin. Arterial changes were registered with approximately a 10-second delay. 41 comparative transcutaneous and arterial Po₂ measurements were performed. Transcutaneous Po₂ values correlated quite well with arterial values within the whole Po₂ range, the correlation being particularly satisfactory in the Po₂ range below 100 mmHg. The method is suitable for long-term monitoring of newborn infants, as it is without risk.