Evaluation of SC-V Versus Conventional CPR

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00000502
Recruitment Status : Completed
First Posted : October 28, 1999
Last Update Posted : November 26, 2013
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI)

Brief Summary:
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.

Condition or disease Intervention/treatment Phase
Arrhythmia Cardiovascular Diseases Heart Arrest Heart Diseases Myocardial Infarction Ventricular Fibrillation Cerebral Anoxia Procedure: cardiopulmonary resuscitation Phase 3

Detailed Description:


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.


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.

Study Type : Interventional  (Clinical Trial)
Intervention Model: Crossover Assignment
Primary Purpose: Treatment
Study Start Date : September 1981
Actual Study Completion Date : June 1985

Resource links provided by the National Library of Medicine

MedlinePlus related topics: CPR

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 75 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Men, women, and children in cardiac arrest for which CPR was initiated in ten minutes or less from the time of arrest.

Publications: Identifier: NCT00000502     History of Changes
Other Study ID Numbers: 21
R01HL028941-03 ( Other Grant/Funding Number: US NIH Grant Number )
First Posted: October 28, 1999    Key Record Dates
Last Update Posted: November 26, 2013
Last Verified: May 2000

Additional relevant MeSH terms:
Cardiovascular Diseases
Heart Diseases
Myocardial Infarction
Ventricular Fibrillation
Heart Arrest
Hypoxia, Brain
Pathologic Processes
Myocardial Ischemia
Vascular Diseases
Arrhythmias, Cardiac
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases