TY - CHAP M1 - Book, Section TI - Wide QRS Tachycardia A1 - Klein, George J. A2 - Prystowsky, Eric N. A2 - Klein, George J. A2 - Daubert, James P. Y1 - 2020 N1 - T2 - Cardiac Arrhythmias: Interpretation, Diagnosis, and Treatment, 2e AB - Wide QRS tachycardia (WCT) is traditionally defined as tachycardia having QRS duration greater than 120 ms, the upper limit of normal QRS duration.1 Tachycardia fitting this general description may be broadly classified by mechanism into 3 groups2,3 as depicted in Figure 13-1 These include ventricular tachycardia (VT), supraventricular tachycardia (SVT) with aberration, and preexcited tachycardia. To these 3, it is useful to consider and rule out paced rhythm (with rate response, tracking of atrial rhythm, or pacemaker-mediated tachycardia) and artifactual tachycardia (Figure 13-2), which may at times look deceptively like VT. Finally, sinus or supraventricular tachycardia with gross ST elevation may occasionally be mistaken for VT. SVT may be defined for this discussion as any tachycardia utilizing the normal atrioventricular (AV) conduction system for ventricular excitation, with the tachycardia either originating in the atria or AV node or requiring 1 of the latter structures for their perpetuation. These tachycardias include AV node reentry, orthodromic atrioventricular reentry, atrial flutter, atrial fibrillation, sinoatrial node reentry, and atrial tachycardia. SN - PB - McGraw Hill CY - New York, NY Y2 - 2024/03/29 UR - accesscardiology.mhmedical.com/content.aspx?aid=1176522835 ER -