Idiopathic verapamil-sensitive left ventricular tachycardia complicated byright ventricular outflow tract ventricular tachycardia and ventricular fibrillation

Idiopathic ventricular tachycardias (VTs) are generally divided into those arising from the right ventricle and those arising from the left ventricle. There has been few reports of two morphologically distinct VT occurring in patients with no apparent structural heart disease. We report a patient wi th verapamil-sensitive left VT with a right bundle branch block pattern tha t spontaneously changed to VT with a left bundle branch block pattern. Vent ricular fibrillation was induced by the application of programmed stimulati on. Although it is unclear if our patient with pleomorphic VT has ventricul ar vulnerability, it is necessary to investigate further and follow him car efully.