The three irregularly irregular rhythms are atrial fibrillation ... and ventricular tachycardia. Treat a wide-complex tachycardia like ventricular tachycardia until proven otherwise.

He presented to urgent care and was found to be in wide complex tachycardia at the rate of about 200 bpm (Figure 1). The patient was given diltiazem intravenously and converted to atrial flutter ...

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 ...