Transcutaneous Po2 as a Trend Indicator of Arterial Po2 in Normal Anesthetized Adults

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Abstract
The transcutaneous technique of measuring Po2 (tcPo2) was studied in 30 adults with normal cardiovascular function undergoing nitrous oxide-enflurane or nitrous oxide-fentanyl anesthesia to determine the relationship between tcPo2and Pao2. The tcPo2 was an accurate and clinically useful trend indicator of Pao2 (r = 0.9; p < 0.0001). The ability to detect trends was unaffected by the type of anesthetic agent used. The technique was less useful in predicting absolute values for Pao2 (r = 0.86). It is suggested that more widespread application of such monitoring awaits definitive development of a halothane-resistant electrode.

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