<prompt> Which of the following results in broad complex tachycardia?Antidromic conduction in Accessory pathway mediated tachycardiaOhodromic conduction in accessory pathway mediated tachycardiaAV nodal re-entrant tachycardiaAtrial fibrillation  <response>: Antidromic conduction in AP mediated tachycardia results in broad complex tachycardia as the impulses travel in the ventricles inter-myocyte conduction. Speed of conduction of inter-myocyte conduction is less than that of purkinje network leading to broad complex tachycardia. Choices B, C and D result in narrow complex tachycardia. Impoant causes of broad complex tachycardia- Antidromic conduction in WPW Monomorphic VT Torsades de pointes Polymorphic Ventricular tachycardia 