Evaluation of SC-V Versus Conventional CPR

BACKGROUND:

Since the 1960's, developments in cardiopulmonary resuscitation have resulted in the savings of countless numbers of lives. More recently, the emphasis has been on increasing CPR capability through the development of prehospital emergency care systems and the involvement of the lay public in the provision of CPR. The effectiveness of this technique in the prehospital setting has been demonstrated in several community studies of patients in cardiac arrest where survival rates ranged from 11-17 percent.

Additionally, for patients in ventricular fibrillation, the proportion of patients discharged alive ranged from 14-30 percent in five cities where the outcome of EMS programs has been examined. These successes, however, concealed many failures in which CPR could not reverse death even though correctly applied within established periods between arrest and resuscitation. However, considerable potential existed for improving CPR techniques and for making additional inroads towards the estimated 100,000 deaths each year in the United States that could be reversed through the widespread application of CPR.

A major goal of CPR is to maintain adequate peripheral perfusion (particularly the cerebral and coronary circulation) during cardiac arrest while attempts are being made to restore normal cardiac function. Maneuvers which increase intrathoracic pressure, such as total airway occlusion during chest compression and abdominal compression by binding, have been shown to increase carotid blood flow in the dog.

Sixteen periods of conventional CPR followed by SC-V CPR and return to conventional CPR were studied in 11 cases of in-hospital cardiac arrest at Johns Hopkins University. The findings indicated that simultaneous compression and ventilation at high airway pressures (SC-V CPR) greatly increased carotid flow velocity and radial artery pressure over values achieved with conventional CPR. Maximum benefit was achieved in patients in whom standard or conventional cardiopulmonary resuscitation was least effective. The increases in flow index noted with simultaneous compression and ventilation were up to 274 percent of control.