title: Repetitive, monomorphic ventricular tachycardia: clinical and electrophysiologic characteristics in patients with and patients without organic heart disease.
abstract: The clinical and electrophysiologic characteristics of 6 patients who had repetitive monomorphic ventricular tachycardia (VT) after a remote myocardial infarction (group A) were compared with those of 22 patients who had this arrhythmia without structural heart disease (group B). VT had a right bundle branch block morphologic pattern in 5 of 6 group A patients and a left bundle branch block morphologic pattern in all group B patients. Endocardial catheter activation mapping was performed in 4 group A patients and in 9 group B patients during VT. In all group A patients, the site of VT origin was on the border of the previous infarction; in all group B patients VT originated at the right ventricular outflow tract. Pacing and programmed stimulation induced VT in 5 of 6 group A patients and 7 of 22 group B patients (p = 0.03). Isoproterenol infusion provoked VT in 4 group A patients and 9 group B patients. Type I antiarrhythmic agents suppressed VT in 4 group A patients and in 14 group B patients, whereas propranolol suppressed VT in 3 of 3 group A patients tested and in 12 of 20 group B patients. Verapamil suppressed spontaneous VT in 1 group A patient and in 4 group B patients. During a mean follow-up of 19 months for group A and 40 months for group B, no patient had died suddenly or had cardiac arrest.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D005080:Exercise Test; D005260:Female; D006801:Humans; D007545:Isoproterenol / Q000009:adverse effects; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000150:complications* / Q000503:physiopathology; D011433:Propranolol / Q000627:therapeutic use; D013610:Tachycardia / Q000188:drug therapy / Q000209:etiology / Q000503:physiopathology*; D014700:Verapamil / Q000627:therapeutic use
chemical_list: D011433:Propranolol; D014700:Verapamil; D007545:Isoproterenol