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Medical Definition of Dressler beat
1. Fusion beat interrupting a ventricular tachycardia and producing a normally narrow QRS complex as a result of the fusion of two impulses, one impulse from the ventricular tachycardia and the other from a supraventricular focus; Dressler beat's strongly support the diagnosis of ventricular tachycardia by interruption of it. (05 Mar 2000)