Transcutaneous and End-Tidal CO₂ Measurements in Hypoxia and Hyperoxia.

Transcutaneous measurement of carbon dioxide (CO₂) has been proposed for physiological monitoring of tactical jet aircrew because in some clinical settings it mirrors arterial CO₂ partial pressure (Pco₂). End-tidal monitoring in laboratory settings is known to give high-fidelity estimates of Pco₂. The correspondence between end-tidal (Pco₂) and transcutaneous Pco₂ (tcPco₂) was examined in healthy volunteers under laboratory conditions of hyperoxia and hypoxia.