IDIOPATHIC RIGHT-VENTRICULAR OUTFLOW TRACT TACHYCARDIA - A CLINICAL APPROACH

Right ventricular outflow tract (RVOT) tachycardia is the most common form of idiopathic ventricular tachycardia (VT). Phenotypically, RVOT tachycardia segregates into two predominant forms, one characterized b y repetitive monomorphic nonsustained VT and the other by paroxysmal e xercise induced sustained VT. There is an increasing body of evidence to support the concept that both forms of tachycardia reflect disparat e clinical manifestations of an identical cellular mechanism (i.e., cA MP-mediated trigered activity), which is identified clinically by the tachycardia's sensitivity to adenosine. The clinical characteristics, natural history, and approaches to therapy of RVOT tachycardia are del ineated herein.