1. Mode switch behavior of DDD pacemaker during atrial flutter
Mode switch behavior of DDD pacemaker during atrial flutter. Surface lead II, marker channel, and atrial electrograms (EGMs) are shown. In the beginning of the tracing, atrial flutter is sensed and the ventricle is paced at, but does not exceed, the upper rate limit of 110 beats/min. Once atrial tachyarrhythmia detection criteria are met, mode switch occurs (*). Pacemaker switches mode to DDI (no atrial tracking) at 70 beats/min with rate-smoothing function to avoid an abrupt change in pacing rate.
Source: Chapter 43. Bradyarrhythmias and Pacemakers, Hurst's The Heart, 13e
Citation: Fuster V, Walsh RA, Harrington RA. Hurst's The Heart, 13e; 2011 Available at: Accessed: December 30, 2017
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