ELECTRODE MICRODISLODGMENT AS A CAUSE OF PSEUDOCAPTURE IN A VDD PACEMAKER

The new AV sequential pacemakers have improved the suitability for the election of the best pacing mode for each patient, The complexity of the systems may mask some dysfunctions. In the presented case, a failu re to capture due to microdislodgment, may have been missed in a simpl e pacemaker control, because of the combination of several factors: th e presence of normal AV conduction at that moment, the concordance bet ween the pacemaker stimulus and the conduced QRS complex and the simil ar morphology of the conduced and paced QRS complex.