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Figure 2 Response to Earlier PACs
(A) Response in junctional tachycardia (JT): the open circle represents the anticipated JT beat timing if no PAC were delivered. An early PAC advances the immediate JT beat and His timing by atrioventricular (AV) nodal fast pathway activation and JT continues. (B) Response in AVNRT: an early PAC may advance the immediate His by activation of the AV nodal fast pathway. However, that makes the fast pathway refractory and unavailable for retrograde conduction, terminating the AVNRT circuit. Red arrow indicates PAC and its response. Legends and abbreviations as in Figure 1.
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