Transcutaneous monitor approximates PaCO2 but not PaO2 in anesthetized rabbits

In healthy anesthetized rabbits, PtcCO2 closely approximated PaCO2. In contrast PtcO2 underestimated PaO2, particularly at high values. The PtcCO2 sensor may be a useful noninvasive way to assess adequacy of ventilation in anesthetized rabbits.