Capnography during cardiopulmonary resuscitation

Several investigators have shown CO2 monitoring to be useful during cardiopulmonary resuscitation. Sudden increases in PetCO2 during cardiopulmonary resuscitation indicate a return of spontaneous circulation, and it has been found that PetCO2 values from patients who were likely to be resuscitated were twice as high as those from patients who could not be resuscitated. Moreover, a sudden interruption of pulmonary perfusion due to acute embolism causes an increase in physiological dead-space which reduces PetCO2 without markedly affecting PaCO2 (Falk et al. 1987).

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