Unique preferential conduction within the isolated septal substrate in a patient with ventricular tachycardia complicated with non-ischemic dilated cardiomyopathy

• Published in: Journal of electrocardiology 2013-11, Vol.46 (6), p.682-685
• Main Authors: Watanabe, Masaya, MD, PhD, Yokoshiki, Hisashi, MD, PhD, Mitsuyama, Hirofumi, MD, PhD, Mizukami, Kazuya, MD, Tsutsui, Hiroyuki, MD, PhD
• Format: Article
• Language: English
• Subjects: Aged; Cardiomyopathy, Dilated - complications; Cardiomyopathy, Dilated - diagnosis; Cardiomyopathy, Dilated - surgery; Cardiovascular; Female; Heart Conduction System - abnormalities; Heart Conduction System - surgery; Humans; Isolated septal substrate; Myocardial Ischemia - complications; Non-ischemic dilated cardiomyopathy; Tachycardia, Ventricular - complications; Tachycardia, Ventricular - diagnosis; Tachycardia, Ventricular - surgery; Treatment Outcome; Ventricular Septum - surgery; Ventricular tachycardia
• ISSN: 0022-0736; 1532-8430
• DOI: 10.1016/j.jelectrocard.2013.03.015

Abstract We describe the case of a 67-year-old woman with non-ischemic dilated cardiomyopathy who underwent successful radiofrequency catheter ablation for ventricular tachycardia (VT) originated from the isolated ventricular septal substrate. Pacemapping exhibited either left, identical to clinical VT, or right bundle branch block like wide QRS morphology. Time interval from the stimulus to QRS onset (St-QRS) was prolonged at the center of the substrate, while St-QRS at the border was shortened. Difference in the morphology of pacemapping was dependent on whether or not the pacing stimulus could propagate directly into the right ventricle due to the possible intramural conduction disturbance.