Differential diagnosis of broad complex tachycardia. Dr.Deepak Raju. Definitions. Wide Complex Tachycardia(WCT)-a rhythem with QRS duration ≥ 120 ms and heart rate > 100 bt /min Ventricular tachycardia-a WCT originating below the level of His bundle
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RBBB morphology-QRS complex duration ≥ 120 ms with a predominantly positive terminal deflection in V1
Functional aberration results from sudden change in cycle length when parts of the His-Purkinje system are partially or wholly inexcitable
Concordance of the limb leads-predominantly neg QRS complex in limb leads s/o VT
Variation in QRS complex altitude during WCT-due to summation of p wave on the QRS complex –clue to presence of AVD
VT originating from other sites-show a slow initial upward vector f/b main vector pointing downward and creates a predominantly negative QRS in lead aVR.