Paradoxical Induction of Endless Loop Tachycardia by Magnet Application Over a DDD Pacemaker |
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Authors: | S. SERGE BAROLD MICHAEL D. FALKOFF LING S. ONG ROBERT A. HEINLE |
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Affiliation: | Division of Cardiology, Department of Medicine, The Genesee Hospital and The University of Rochester School of Medicine and Dentistry, Rochester, New York |
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Abstract: | It is well known that removal of a testing magnet from a DDD pulse generator may cause endless loop tachycardia in patients with retrograde ventriculoatrial conduction; application of the magnet then terminates the tachycardia. We have observed the opposite response to the magnet and in this report we describe the paradoxical induction of endless loop tachycardia by magnet application over a DDD pulse generator and its persistence despite repeated removal and reapplication of the magnet. This unusual behavior occurred only in the "magnet off" function and is due to magnet-induced signals sensed by the atrial channel circuitry. |
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Keywords: | DDD pacemaker endless loop tachycardia pacemaker magnet retrograde ventriculoatrial conduction |
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