A 41‐year‐old man with a history of tachycardia refractory to multiple antiarrhythmic drugs was sent to our institution. His 12‐lead electrocardiogram demonstrated incessant narrow QRS complex tachycardia with negative P… Click to show full abstract
A 41‐year‐old man with a history of tachycardia refractory to multiple antiarrhythmic drugs was sent to our institution. His 12‐lead electrocardiogram demonstrated incessant narrow QRS complex tachycardia with negative P waves in the inferior leads and long RP interval. Occasionally, the tachycardia terminated after a P wave and then was restarted after a sinusal beat. An EP study was performed during tachycardia. Intracardiac electrograms during tachycardia and response to pacing maneuvers are shown. What is the tachycardia mechanism?
               
Click one of the above tabs to view related content.