Visually inapparent microvolt-level TWA, uncovered by digital signal processing.
TWA: T-wave alternans. * The more positive T-wave of each alternating pair.
Reproduced from: Narayan SM. T-wave alternans and the susceptibility to ventricular arrhythmias. J Am Coll Cardiol 2006; 47:269. Illustration used with the permission of Elsevier Inc. All rights reserved.