Abbreviation: WCT
A category of tachyarrhythmias (i.e., pulse >100 bpm) characterized by a wide QRS complex (> 120 ms; or 3 small squares on the ECG). Includes monomorphic ventricular tachycardia, polymorphic ventricular tachycardia (e.g., torsades de pointes), supraventricular tachycardia with variable conduction (e.g., with bundle branch blocks or accessory pathways), pacemaker-associated tachycardia, and tachyarrhythmias caused by drugs or metabolic conditions that widen the QRS interval.