<prompt> Which of the following is a supraventricular tachycardia?Atrioventricular nodal re-entry tachycardia AVNAtrioventricular re-entry tachycardia AVAtrial tachycardiaAll of the above  <response>: The term supraventricular tachycardia SVT encompasses many tachycardias in which atrial or atrioventricular nodal tissue are essential for sustaining the arrhythmia. In practice, however, the term SVT is generally used to refer to atrioventricular nodal re-entry tachycardia AVN, atrioventricular re-entry tachycardia AV, and atrial tachycardia. Differential diagnosis of a narrow complex tachycardia Common causes Sinus tachycardia Atrioventricular nodal re-entry tachycardia AVN Atrioventricular re-entry tachycardia AV Atrial tachycardia Atrial flutter Atrial fibrillation Rare causes Inappropriate sinus tachycardia Sinus node re-entry Permanent junctional reciprocating tachycardia Non-paroxysmal junctional tachycardia Focal junctional tachycardia Ref: 1. Diagnosis and management of supraventricular tachycardia ; BMJ 2012;345:e7769 2. Blomstrom-Lundqvist C, Scheinman MM, Aliot EM, Alpe JS, Calkins H, Camm AJ, et al. ACCAHAESC guidelines for the management of patients with supraventricular arrhythmias; J Am Coll Cardiol2003;42:1493-531. 