• Bernard Belhassen and Oholi Tovia-Brodie.
• Heart Institute, Hadassah Medical Center, Jerusalem and Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel. Electronic address: bblhass@gmail.com.
• Am. J. Med. 2022 Dec 1; 135 (12): 143414361434-1436.

AbstractIdiopathic ventricular fibrillation is responsible for ≈5%-7% of aborted cardiac arrest, mainly striking subjects in their forties. Syncope caused by short-coupled rapid polymorphic ventricular tachycardia is frequently noted in a patient's past history. However, a diagnosis of neurally mediated syncope, the most frequent cause of syncope in the young, is often erroneously made. Clinical clues suggest that syncope has an arrhythmic rather than a neurally mediated origin. In addition, the presence of premature ventricular contractions on an electrocardiogram recorded shortly after a syncopal event has utmost importance in establishing the cause of syncope. Although such extrasystoles are frequently benign, especially when associated with a long coupling interval, they also may suggest a malignant origin when closely coupled to the preceding complex with short coupling intervals (usually <350 ms). These arrhythmias mainly originate from the Purkinje system (usually the right ventricle in men and the left ventricle in women) and favorably respond to quinidine as well as to ablation therapy targeting Purkinje-fibers ectopic activity.Copyright © 2022 Elsevier Inc. All rights reserved.

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