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A Comprehensive Educational Website (established 1998)

Designed, Produced, and maintained (Edition 10, March 2019) by 

Bhavani Shankar Kodali MD

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Capnogram recorded during general anesthesia for cesarean section.

The slope of the phase III is increased. This is a normal physiological variation. Airway obstruction can result in an increase in the phase III as well. Depending on the severity of airway obstruction, phase II can also be prolonged.

Occasionally, a phase IV can also occur in capnograms recorded during anesthesia in pregnant subjects.

 

Reference:


Bhavani-Shankar et al. Canadian Journal of Anaesthesia 1992;39:617-32.

Shankar KB et al. Arterial to end-tidal carbon dioxide difference during cesarean section anaesthesia. Anaesthesia 1986;41:698-702.

Shankar KB et al. Arterial to end-tidal carbon dioxide difference during  anaesthesia for tubal ligations. Anaesthesia 1987;42:482-6.
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