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Relationship between Arterial and Heated Skin Surface Carbon Dioxide Tension in Adults

Carbon dioxide tension was measured on heated skin surface (PSCO2) and in arterial blood (PaCO2) in eight adult patients during intermittent positive pressure ventilation. A total of 299 PaCO2 ‐ PSCO2 measurements were performed at electrode temperatures of 45°C, 43°C and 38°C. The PSCO2‐PaCO2 relation was evaluated using: 1) linear regression, 2) PSCO2/PaCO2 ratio and 3) temperature correction methods. Both linear regression and ratio indicate temperature dependency of the PSCO2‐PaCO2 relation. The temperature correction method was done with a blood PCO2 temperature coefficient of 4.6% per °C and at two temperatures: electrode temperature (according to Severinghaus) and estimated capillary blood temperature. The results indicate that the relation between PaCO2, PSCO2 and electrode temperature is constant enough to permit estimation of PaCO2 from PSCO2 during stable circulatory conditions.