Designed, Produced and maintained by

Bhavani Shankar Kodali MD

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Definitions

Bhavani Shankar Kodali MD



Capnometry:
The measurement and display of carbon dioxide (CO2) on a digitial or analogue monitor. Maximum inspiratory and expiratory CO2 concentrations during a respiratory cycle are displayed.

Capnography:
A graphic display of instantaneous CO2 concentration (FCO2) versus time or expired volume during a respiratory cycle (CO2 waveform or capnogram)


Capnograms:
CO2 waveforms which can be of two types: FCO2 can be plotted against expired volume (SBTCO2 curve /volume capnogram/ CO2 expirogram) or against time (time capnogram) during a respiratory cycle.


PACO2:
Partial pressure of CO2 in the alveoli.


PaCO2:
Partial pressure of CO2 in arterial blood.


PETCO2:
Partial pressure of CO2 at the end of expiration.


(a-ET)PCO2:
Arterial to end-tidal CO2 tension/pressure difference or gradient.


PvCO2:

Partial pressure of CO2 in mixed venous blood.

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