One tachycardia with two entrainment responses: What is the mechanism?

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One tachycardia with two entrainment responses: What is the mechanism? Hetal Bhakta, MD, Xunzhang Wang, MD, Nigel Gupta, MD, Sen Ji, MD, PhD Heart Rhythm Volume 7, Issue 1, Pages 136-137 (January 2010) DOI: 10.1016/j.hrthm.2008.12.026 Copyright © 2010 Heart Rhythm Society Terms and Conditions

Figure 1 Ventricular entrainment pacing with a true VAAV response. The entrainment was delivered at a relatively early time of the ventricular cycle (V-V1 230 ms) (A) and the response to the entrainment (B). Heart Rhythm 2010 7, 136-137DOI: (10.1016/j.hrthm.2008.12.026) Copyright © 2010 Heart Rhythm Society Terms and Conditions

Figure 2 Ventricular entrainment pacing with a pseudo-VAAV response. The entrainment was delivered at a time relatively late in the ventricular cycle as compared with Figure 1A, with V-V1 330 ms (A) and the response to the entrainment (B). Heart Rhythm 2010 7, 136-137DOI: (10.1016/j.hrthm.2008.12.026) Copyright © 2010 Heart Rhythm Society Terms and Conditions