<prompt> The most common form of PSVT?Tachycardia originating from the atriumAV nodal reentry tachycardiaWPW syndromeFocal atrial tachycardia  <response>: Pathologic supraventricular tachycardia A. Tachycardia originating from the atriumDefining feature: tachycardia may continue despite beats that fail to conduct to the ventricles, indicating that the AV node is not paicipating in the tachycardia circuitB. AV nodal reentry tachycardiaDefining feature: paroxysmal regular tachycardia with P waves visible at the end of the QRS complex or not visible at allThe most common paroxysmal sustained tachycardia in healthy young adults; more common in womenC. Tachycardias associated with accessory atrioventricular pathwaysDefining feature: paroxysmal sustained tachycardia similar to AV nodal reentry; during sinus rhythm, evidence of ventricular preexcitation may be present Wolff-Parkinson-White syndrome or absent concealed accessory pathwayHarrison 19e pg: 1476 