Patients in cardiac arrest often have asynchronous electrical activity of the cardiomyocytes, and defibrillation is performed to restore synchronized contraction, as well as electrical conduction, to the cardiomyocytes. Defibrillation is an effective means of terminating ventricular fibrillation using an instrument to allow the heart to adequately resuscitate, often through the principle of strong current inhibition, with brief high-energy pulses of current through the chest wall or directly through the heart, causing all myocardial cells to be touched simultaneously in an instant, inhibiting various ectopic foci of excitation of myocardial activity. This results in the restoration of sinus rhythm by normal impulse conduction in the conduction system of the heart as well as in the highest commanders of the pacing system, such as the sinoatrial node.