It is recognized that a type of idiopathic ventricular tachycardia (VT) arises from the left ventricular outflow tract (LVOT). This VT exhibits sustained or nonsustained forms, but also appears as frequent premature ventricular contractions (PVCs) of monomorphic QRS morphology. The prognosis is almost uniformly benign. We describe a patient with tachycardiomyopathy resulting from LVOT VT.