Simultaneous narrow and wide QRS complex tachycardia: Misdiagnosis or missed diagnosis?

Abstract

A38‐year‐old woman presented with recurrent episodes oftachycardia in the absence of structural heart disease anddocumented with narrow QRS complex tachycardia (NCT) on a24‐h Holter ECG. During the electrophysiological study (EPS), herNCT was induced easily by programmed ventricular extrastimuluswith the retrograde right bundle (RB) branch block (RBBB).