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KMID : 0376119920190010091
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Medical Journal of the Red Cross Hospital
1992 Volume.19 No. 1 p.91 ~ p.98
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Changes in End Tidal CO2 Before and After Release of Tourniquet
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Abstract
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In 24 healthy adult patients having orthopedic surgical procedures requiring the use of a tourniquet under general anesthesia with controlled mechanical ventilation, we have determined changes in end tidal CO2(PETCO2) and arterial blood gas value
before
and after release of tourniquet. After deflation of tourniquet, PETCO2 and PaCO2 increased significantly with the maximal elevation occuring within two minutes.The pH level decreased significantly and maximally within three minutes. There was
statistically significant linear correlation between PETCO2 and PaCO2, suggesting prediction of the PaCO2 level by monitoring the PETCO2 level. On these findings, hyperventilation may be indicated to facilitate the return of PaCO2 and pH to
baseline
just before and for several minutes after tourniquet release, especially in patients with increased intracranial pressure. In conclusion, we recommend noninvasive monitoring of the PETCO2 level instead of invasive measurement of the PACO2 level.
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