J Postgrad Med Close
 

Normal capnogram. AB, phase I, no CO2 late inspiration, early expiration BC, phase II ascending limb, appearance of CO2 in exhaled gases CD, phase III plateau, consistent CO2 concentration D highest point ETCO2 DE, phase IV rapid descent, inspiration.

Normal capnogram. AB, phase I, no CO2  late inspiration, early expiration BC, phase II  ascending limb, appearance of CO2 in exhaled gases CD, phase III  plateau, consistent CO2 concentration D  highest point ETCO2 DE, phase IV  rapid descent, inspiration.