This wide QRS complex tachycardia has a typical left bundle branch block pattern, but two things give the clue that this is ventricular tachycardia. There is a fusion beat (second from left ...

A Dressler beat (a.k.a. fusion beat) occurs during ventricular tachycardia and is also known as a fusion beat. This occurs when sinus node activity (P wave) begins to conduct through the normal ...