3789432 tcPCO2 transcutaneous PCO2 24 3789433 TcPCO2 transcutaneous monitoring of PCO2 2 3789436 TcPCO2 transcutaneous partial pressure of CO2 2 3789434 tcPCO2 transcutaneous measurements of the partial pressures of PCO2 1 3789435 tcPCO2 transcutaneously measured PCO2 1