Critical care medicine
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Critical care medicine · Oct 1987
End-tidal carbon dioxide as a noninvasive monitor of circulatory status during cardiopulmonary resuscitation: a preliminary clinical study.
In four postoperative cardiac patients during controlled ventilation, acute circulatory failure was associated with decreases in end-tidal CO2 (PetCO2) and cardiac index. Closed cardiac compression caused an increase in both PetCO2 and cardiac index, with complete restoration to baseline values after successful CPR. Our data indicate that PetCO2 measurements during controlled ventilation in acute circulatory failure patients may be used as an indirect noninvasive tool to monitor the patient's hemodynamic status during CPR.
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Critical care medicine · Oct 1987
Case ReportsEmergency airway clot removal in acute hemorrhagic respiratory failure.
Three cases of respiratory failure and severe hypoxemia caused by blood clot obscuring the central airway are described. A technique to clear the airway using a no. 6 Fogarty balloon-tip embolectomy catheter inserted through a flexible fiberoptic bronchoscope was used in all three cases. Marked improvement and stabilization occurred while definitive therapy was undertaken.
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To learn modes of CO2 elimination during cardiac arrest, we continuously measured end-tidal CO2 concentration (ETCO2) in acutely arrested dogs with constant ventilation. A decrease in peak ETCO2 during cardiac arrest in each dog showed a washout biexponential function when graphed on semilog paper. ⋯ The ETCO2 also reflected the potential effects of external cardiac compressions on pulmonary blood flow, as previously reported. Besides mixed venous blood CO2 flowing back to the lungs by cardiac compressions, it should be noted that both alveoli and pulmonary capillary blood CO2 are also reflected in the ETCO2 during the first minute of CPR.