Write about Bohr Equation here.
The Bohr equation is used to derive physiological dead space.
It may be calculated using the results from an arterial blood gas and End tidal CO2.
Refer to a respiratory physiology text book for an exlanation of how to derive the equation (A-Z of Anaesthesia and Intensive Care).
VD = PaCO2 – PETCO2
VD = Dead space
VT = Tidal volume
PaCO2 = Arterial CO2
PETCO2 = End tidal CO2