Dressler beats in ventricular tachycardia

Dressler beat, named after William Dressler from Poland, is a fusion beat interrupting ventricular tachycardia. Fusion beats are recognised by narrower QRS complexes than that of the tachycardia. It is the result of fusion of the ventricular tachycardia beat with a supraventricular beat which could be originating from the sinus node or any other supraventricular focus. The presence of fusion beats (Dressler beats) along with capture beats, strongly support the diagnosis of ventricular tachycardia in a wide QRS tachycardia. Dressler beats have been described in ventricular tachycardia occurring during atrial fibrillation as well (Chest 1973;63;96-97)