Zipes et al first described verapamil-sensitive idiopathic left ventricular tachycardia, later named for the author who reported the verapamil sensitivity.


Mechanism: re-entrant circuit or automatic focus in the specialized Purkinje fibers of the left posterior fascicle


Features of Belhassen tachycardia:

(1) paroxysmal ventricular tachycardia arising from the left posterior fascicle

(2) mild QRS prolongation, right bundle branch block and left superior axis on ECG

(3) rapid conversion following administration of verapamil

(4) fails to respond to vagal maneuvers, adenosine or synchronized cardioversion


It can occur at any age and can affect infant or children.


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