Fig. 5From: Volumetric capnography: lessons from the past and current clinical applicationsDifference between the Bohr approach and Enghoff approach. VDaw is the anatomical dead space, VDalv is the alveolar dead space, PACO 2 is the alveolar partial pressure of CO2, PaCO 2 is the arterial partial pressure of CO2, PÄ’CO 2 is the mixed expired partial pressure of CO2 Back to article page