title: Preexcitation syndromes. Mechanisms and management.
abstract: Ventricular preexcitation occurs when, in relation to atrial events, some or all of the ventricular muscle is activated earlier by the atrial impulse than would be expected if conduction of the impulse activated the ventricles by way of the normal atrioventricular conduction system. The purpose of this article is to review the pathophysiology of the variants of preexcitation and to discuss the therapeutic approach to patients who have tachyarrhythmias.
mesh_terms: D000889:Anti-Arrhythmia Agents / Q000627:therapeutic use; D001283:Atrioventricular Node / Q000503:physiopathology; D002036:Bundle of His / Q000503:physiopathology; D002037:Bundle-Branch Block / Q000503:physiopathology; D004562:Electrocardiography; D004594:Electrophysiology; D006325:Heart Atria / Q000503:physiopathology; D006329:Heart Conduction System / Q000187:drug effects; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D009431:Neural Conduction; D010138:Pacemaker, Artificial; D011690:Purkinje Fibers / Q000503:physiopathology; D013577:Syndrome; D013614:Tachycardia, Paroxysmal / Q000503:physiopathology; D014927:Wolff-Parkinson-White Syndrome / Q000209:etiology* / Q000503:physiopathology / Q000628:therapy
chemical_list: D000889:Anti-Arrhythmia Agents