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Intermittent atrial undersensing in single-lead VDD pacemakers in patients with bradycardia-sensitive repolarization:
Víctor Palanca1, Alejandro Navarro, Javier Jiménez
1Unidad de Arritmias, Instituto Cardiovascular del Consorcio Hospital General Universitario de Valencia, Valencia, Spain. palanca_vic@gva.es
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.
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