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Response to an early APB in AVNRT with simultaneous anterograde fast and slow AV nodal pathways conduction. Therefore, AVNRT continues after an APB that advances the immediate His. (A, atrium; ACL, arrhythmia cycle length; APB, atrial premature beat; AVN, atrioventricular node; FP, fast pathway; SP, slow pathway; V, ventricle)
