Abstract
WCTs are frequently encountered in the ED. Causes of WCT are broad and range from benign to life-threatening (eg, atrial fibrillation with WPW, or ventricular tachycardia). It is imperative that the emergency physician is familiar with the clinical presentation, un-derlying causes, and ECG features of the different causes of WCT. However, in a busy clinical setting, simplifying the approach to treatment by categorizing WCT into regular versus irregular might be the safest and easiest method. Regular WCT should always be presumed to be VT unless proven otherwise. Irregular WCT are rarely ventricular in origin.