Nonobstructive septal hypertrophy in a young adult provoking recurrent polymorphic ventricular tachycardia successfully treated with transaortic and transventricular septal myectomy: A case report Philip Y. Sun, MSc, John P. Bois, MD, Seth H. Sheldon, MD, Samuel J. Asirvatham, MD, FHRS HeartRhythm Case Reports Volume 1, Issue 5, Pages 300-304 (September 2015) DOI: 10.1016/j.hrcr.2015.03.021 Copyright © 2015 Heart Rhythm Society Terms and Conditions
Figure 1 A 12-lead resting electrocardiogram demonstrating increased voltage consistent with left ventricular hypertrophy and anterolateral ST depression and T-wave inversion consistent with hypertrophic cardiomyopathy. HeartRhythm Case Reports 2015 1, 300-304DOI: (10.1016/j.hrcr.2015.03.021) Copyright © 2015 Heart Rhythm Society Terms and Conditions
Figure 2 A: Parasternal long-axis transthoracic echocardiogram demonstrating marked septal hypertrophy (29 mm) and reverse-curve morphology. B: Continuous wave Doppler echocardiogram through the left ventricular outflow tract in the apical long-axis view without evidence of obstruction (highest recorded gradient was 0.8 m/s). HeartRhythm Case Reports 2015 1, 300-304DOI: (10.1016/j.hrcr.2015.03.021) Copyright © 2015 Heart Rhythm Society Terms and Conditions
Figure 3 Echocardiogram stress test results revealing pronounced ST depressions in the anterior, anterolateral, and inferior leads with ST elevation in AVR. These findings developed 1 minute 50 seconds into a Bruce-protocol stress test and were concerning for ischemia. HeartRhythm Case Reports 2015 1, 300-304DOI: (10.1016/j.hrcr.2015.03.021) Copyright © 2015 Heart Rhythm Society Terms and Conditions
Figure 4 Echocardiogram stress test results revealing polymorphic ventricular tachycardia that developed 4 minutes 6 seconds into a Bruce-protocol stress test (2 minutes 16 seconds after the ST changes described in Figure 3 occurred). HeartRhythm Case Reports 2015 1, 300-304DOI: (10.1016/j.hrcr.2015.03.021) Copyright © 2015 Heart Rhythm Society Terms and Conditions
Figure 5 A: Coronary angiogram demonstrating a large septal perforator (red arrow). B: During systole, marked myocardial bridging is noted (blue arrow). HeartRhythm Case Reports 2015 1, 300-304DOI: (10.1016/j.hrcr.2015.03.021) Copyright © 2015 Heart Rhythm Society Terms and Conditions