Intermittent atrial undersensing in single-lead VDD pacemakers in patients with bradycardia-sensitive repolarization: a possible mechanism for ventricular arrhythmia
Rev Esp Cardiol. 2010 Feb;63(2):229-32.
doi: 10.1016/s1885-5857(10)70042-6.
[Article in
English,
Spanish]
Affiliation
- 1 Unidad de Arritmias, Instituto Cardiovascular del Consorcio Hospital General Universitario de Valencia, Valencia, Spain. [email protected]
Abstract
Intermittent atrial undersensing in patients with single-lead VDD pacemakers is regarded as being of limited clinical significance. Nevertheless, in patients with bradycardia-mediated repolarization abnormalities, undersensing could result in RR-interval oscillations due to changes in pacemaker mode and this could act as a trigger for the initiation of torsades de pointes. We report our findings in three patients, which demonstrate the functioning of this trigger mechanism for ventricular arrhythmias.
MeSH terms
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Aged
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Aged, 80 and over
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Arrhythmias, Cardiac / etiology*
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Arrhythmias, Cardiac / therapy*
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Atrioventricular Block / physiopathology*
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Atrioventricular Block / therapy*
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Bradycardia / physiopathology*
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Bradycardia / therapy*
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Electrocardiography
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Female
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Heart Rate / physiology
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Heart Ventricles
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Humans
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Pacemaker, Artificial*