Original contribution
Expired PCO2 as a prognostic indicator of successful resuscitation from cardiac arrest

https://doi.org/10.1016/S0196-0644(85)80235-3Get rights and content

We performed a study to determine if the measurement of expired PCO2 during CPR for cardiac arrest could be used as a prognostic indicator of successful resuscitation. Twelve mongrel dogs were fibrillated electrically, and external chest massage and assisted ventilation were applied for 15 minutes. Expired PCO2 and aortic and right atrial pressures were monitored each minute of arrest. Coronary perfusion pressure (CPP) was calculated by subtracting the right atrial from the aortic diastolic pressure. Half the dogs received high-force chest compression (801b) and half received low-force chest compression (401b). The six dogs that received high-force compression were resuscitated successfully. The expired PCO2 was significantly higher in the successfully resuscitated dogs (expired PCO2 = 9.6 ± 3.2 mm Hg) when compared to those dogs that died (expired PCO2 = 3.2 ± 1.1 mm Hg, P < .01). Expired PCO2 was highly correlated (r = 0.91, P < .01) with the CPPs. The measurement of expired PCO2 during attempted CPR may be useful as a noninvasive indicator of CPP and adequate technique. Further studies on the use of this technique as an assessment criterion are warranted.

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Presented at the Scientific Assembly of the American College of Emergency Physicians in Dallas, Texas, October 1984.

This study was supported by a grant-inaid from the American Heart Association, Arizona Affiliate.

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