The initial portion of the AVI in most dual-chamber pacemakers is designated as the blanking period. During this portion of the AVI, sensing is suspended. The primary purpose of this interval is to prevent ventricular sensing of the leading edge of the atrial pacing artifact. Any event that occurs during the blanking period, even if it is an intrinsic ventricular event, as shown in the figure, is not sensed. In this example, the ventricular premature beat that is not sensed is followed by a ventricular pacing artifact delivered at the programmed AV interval and occurring in the terminal portion of the T wave.
From: Hayes DL, Wang PJ, Asirvatham SJ, Friedman PA. Timing cycles. In: Cardiac Pacing, Defibrillation and Resynchronization: A Clinical Approach, 3rd ed, Hayes DL, Asirvatham SJ, Friedman PA (Eds), Wiley-Blackwell, West Sussex 2013. Copyright © 2013 Mayo Foundation for Medical Education and Research. Reproduced with permission of John Wiley & Sons Inc. This image has been provided by or is owned by Wiley. Further permission is needed before it can be downloaded to PowerPoint, printed, shared or emailed. Please contact Wiley's permissions department either via email:
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