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  • Print publication year: 2011
  • Online publication date: August 2011

7 - Monitoring during mechanical ventilation

from 1 - Ventilation

Summary

Continuous monitoring of end-tidal carbon dioxide (PETCO2) is a long-established standard of care in the operating room (OR). Carbon dioxide can be useful to monitor the mechanically ventilated patient when used in conjunction with other monitors of the patient's clinical status. CO2 monitoring is affected by changes in metabolism or CO2 production, cardiovascular function, and respiratory function. Comparison of the gradient between arterial and end-tidal CO2 (PaCO2-PetCO2) can offer valuable information regarding a patient's clinical status. In newborns, the therapeutic administration of CO2 in the ventilator circuit has been used in the preoperative management of hypoplastic left heart syndrome. Volumetric capnography or volumetric CO2 (VCO2) is the measurement of CO2 as a function of volume as opposed to time. When CO2 production increases with constant minute ventilation, PaCO2 will increase. Alveolar minute ventilation can be used as a guide for predicting the PaCO2 that may result from adjusting ventilation parameters.

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