Infrasensado auricular intermitente de marcapasos VDD en pacientes con repolarización sensible a bradicardia: un potencial mecanismo de arritmias ventriculares

Intermittent atrial undersensing in patients with singlelead 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.