Cardiovascular Diseases Clinical Trial
To assess the benefits of a new method of cardiopulmonary resuscitation, SC-V CPR (simultaneous compression and ventilation CPR) in terms of short and long-term survival and lessened cerebral dysfunction.
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.
The success of this new method of CPR had been demonstrated during in-hospital clinical
trials. The benefits of this method suggested the need to test the technique in the
prehospital setting where the vast majority of cardiac arrests occur.
DESIGN NARRATIVE:
Units of the Miami and Dade County Rescue Squads utilized the technique in a mid-point
cross-over design. One of the three shifts at each of the study rescue stations had been
thoroughly instructed in the SC-V CPR protocol. A second crew was given an intensive review
of conventional CPR methodology. The third shift initially received the conventional CPR
review and continued to perform conventional CPR. After six months, the third shift was
trained in SC-V CPR and utilized the technique for one year. At the cross-over point, the
crew trained in SC-V CPR received the same intensive review of conventional CPR as did the
other crew. The conventional CPR crews, in turn, were trained in SC-V CPR. Total sample size
was 994 patients, 494 in the treatment group and 500 in the control group.
The study completion date listed in this record was obtained from the Query/View/Report
(QVR) System.
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Intervention Model: Crossover Assignment, Primary Purpose: Treatment
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