Failure of one method of simultaneous chest compression, ventilation, and abdominal binding during CPR

Some modified methods of CPR improve carotid blood flow, but there are no studies to show that these modified techniques improve survival, Accordingly, an experimental CPR technique using simultaneous chest compression, ventilation (SCV-CPR), and abdominal binding was compared to standard CPR in beagle dogs. The modified technique utilized a broad-based bellows device that was mechanically compressed, producing chest compression, delivering a volume of air to the endotracheal tube, and pressurizing an abdominal binder. The duration of ventricular fibrillation and CPR was 5 min. Five of the 6 dogs could be resuscitated with standard CPR. None of 6 dogs could be resuscitated using this modified method of SCV-CPR and abdominal binding. The aortic diastolic pressure and the diastolic gradient between the aorta and right atrium was significantly different between the 2 groups. Because these pressures relate to the coronary perfusion pressure, they may explain the discrepancy in the survival rate. This study suggests increasing carotid blood flow during CPR will not necessarily improve survival.