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The causes of sudden cardiac death in patients with Wolff-Parkinson-White syndrome are considered; necessity of endocardial electrophysiological study and radiofrequency catheter ablation is discussed, including asymptomatic patients with accessory pathways.

Sudden cardiac arrest caused by cardiac and extracardiac pathology is one of the leading causes of death in developed countries. Public-access defibrillation is one of the key techniques for improvement of the pre-hospital and in-hospital resuscitation success and survival rates of resuscitated patients in the case of a sudden cardiac arrest caused by ventricular fibrillation and pulseless ventricular tachycardia. This book chapter will discuss the relation between the type of a sudden cardiac arrest and the survival rate and the "chain of survival" concept and the role of early public-access defibrillation, as well as the function of public-access defibrillation programs and the contribution of automated external defibrillators in pre-hospital and in-hospital resuscitation.