Voltage mapping of Koch's triangle in atrioventricular nodal reentrant tachycardia ablation : Results from an observational multicenter prospective registry.

Background: The identification of a "low-voltage bridge" to guide ablation of atrioventricular nodal reentry tachycardia (AVNRT) has been described as a safe and effective strategy in children. We investigated the presence of a low-voltage bridge in adult patients undergoing AVNRT ablation, to evaluate its anatomical correspondence with the successful ablation site. We also investigated the possible correlations between Koch's triangle anatomy and patients' biometric characteristics.

Ablation catheter orientation: In vitro effects on lesion size and in vivo analysis during PVI for atrial fibrillation.

Background: Catheter-delivered radiofrequency (RF) lesion formation is a complex phenomenon, and few studies have explored the effect of catheter orientation on lesion size and catheter orientation behavior during pulmonary vein isolation (PVI) procedures. We evaluated the influence of catheter orientation on lesion dimensions in an in vitro experimental setting and investigated the catheter orientation behavior during PVI.

Methods And Results: 72 lesions were created in vitro on a porcine heart using a contact force catheter in a parallel, oblique, and perpendicular tip to tissue orientation.

Posterior reversible encephalopathy syndrome as the initial manifestation of Guillain-Barré syndrome: case report and review of the literature.

We report a 63-year-old female patient with Guillain-Barré syndrome revealed after posterior reversible encephalopathy syndrome. The onset was characterized by hypertension, headache, and cortical blindness, followed a few days later by progressive limb and facial paresis, dysautonomia, and respiratory failure. Treatment with plasmapheresis led to a rapid improvement of the clinical picture and the disappearance of magnetic resonance abnormalities.