News | August 14, 2008

Rescuers May be Able to Maintain Chest Compressions During External Defibrillation

August 15, 2008 - Research indicates the feasibility of uninterrupted chest compressions during biphasic external defibrillation shock delivery using modern defibrillation equipment, which may enhance the efficacy of defibrillation and cardiocerebral resuscitation.

Based on the article “An Analysis of Electrical Current Flow Through Rescuers in Direct Contact With Patients During Biphasic External Defibrillation” published in the May 13 issue of Circulation, researchers said their study may lead the scientific community to examine the feasibility of providing uninterrupted chest compressions during biphasic defibrillation.

Brief interruptions in chest compressions reduce the efficacy of resuscitation from cardiac arrest, but interruptions are inevitable during hands-off periods for shock delivery to treat ventricular tachyarrhythmias. The safety of a rescuer remaining in contact with a patient being shocked with modern defibrillation equipment has not been investigated, which was the reason for this study.

This study measured the leakage voltage and current through mock rescuers while they were compressing the chests of 43 patients receiving external biphasic shocks. During the shock, the rescuer’s gloved hand was pressed onto the skin of the patient’s anterior chest. To simulate the worst case of an inadvertent return current pathway, a skin electrode on the rescuers thigh was connected to an electrode on the patient’s shoulder. In no cases were shocks perceptible to the rescuer. Peak potential differences between the rescuer's wrist and thigh ranged from 0.28 to 14 V (mean 5.8 /-5.8 V). The average leakage current flowing through the rescuer's body for each phase of the shock waveform was 283 /-140 microA (range 18.9 to 907 microA). This was below several recommended safety standards for leakage current.

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