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KMID : 1011920100110030035
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International Journal of Arrhythmia
2010 Volume.11 No. 3 p.35 ~ p.38
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A case of DDD pacemaker-reprogramming to DDI in a patient with atrial fibrillation
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Yoon Nam-Sik
Cho Jeong-Gwan
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Abstract
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DDI, defined as AV (atrioventricular) sequential, non-P-synchronous pacing with dual-chamber sensing, allows sensing in both chambers and inhibition in both chambers, but an atrial event will not trigger a ventricular response. Occasionally a DDD device to DDI is useful in preventing the patient from experiencing brief rapid atrial rates. In DDI mode, the rapid atrial fibrillation or flutter waves cannot trigger beats in the ventricle. Modern pacemakers have programs called automatic mode switching and these algorithms have generally eliminated the need for fixed DDI pacing. On the other hand, if the atrial fibrillation is intermittent, the DDI mode will prevent the patient from being paced briefly at maximum tracking rate before being switched to a slower mode. Another potential use for DDI is in a patient with persistent sinus bradycardia. A DDI pacemaker with rate responsiveness will pace consistently in the atrium and the rate-responsive device will allow a
somewhat physiologic response to activity.
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KEYWORD
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pacemaker, atrial fibrillation
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