Associazione Nazionale Medici Cardiologi Ospedalieri




Bernardini Andrea Firenze (Firenze) – U.O. Elettrofisiologia, Ospedale Santa Maria Nuova | Sciara Pietro Firenze (Firenze) – Aou Careggi | Paoletti Perini Alessandro Firenze (Firenze) – U.O. Elettrofisiologia, Ospedale Santa Maria Nuova | Signorini Umberto Firenze (Firenze) – U.O. Elettrofisiologia, Ospedale Santa Maria Nuova | Milli Massimo Firenze (Firenze) – U.O. Elettrofisiologia, Ospedale Santa Maria Nuova | Giomi Andrea Firenze (Firenze) – U.O. Elettrofisiologia, Ospedale Santa Maria Nuova

Background: Marfan syndrome (MFS) is an autosomal dominant disorder of the connective tissue and it’s associated with an increased incidence of atrial fibrillation (AF), due to scar-mediated processes and sites of atrial ectopy. Limited data exist regarding ablation techniques in these patients. The frailty of atrial walls correlated to connective disease makes the ablation challenging with an increased risk of complications. Laser-balloon (LB) approach for pulmonary vein isolation (PVI) could be a promising strategy due to the possibility to ablate a large volume of tissue with a single application of energy, short procedure times, and real-time monitoring of balloon-tissue contact. We present a case in which LB technology was applied for PVI in an MFS patient

Clinical case:  a 44-year-old woman with MFS and paroxysmal AF underwent PVI. The echocardiographic examination showed mild aortic and mitral valve regurgitation, the first due to a slight dilation of the aortic root, the latter associated with mitral valve prolapse. Atrial volume was normal. No other comorbidities were present.
The procedure was executed in general anesthesia. A decapolar catheter was inserted in the coronary sinus and used later to stimulate the phrenic nerve during the ablation of the right pulmonary veins (Fig.1C). Left atria (LA) was reached after an ultrasound-guided transeptal puncture. High-density mapping of the LA was performed to assess the number and geometry of PVs (Fig.1A). A LB catheter was used to perform laser ablation at the level of PV antrum, delivering 13 W in automatic rapid mode in regions with optimal contact and 5.5 W in areas with more represented blood-tissue interface. LA mapping after ablation assessed the effective isolation of pulmonary veins (Fig.1B). No complications occurred during the procedure.

Conclusion: a laser-balloon approach for PVI in MFS patients seems feasible and safe. To our knowledge, this is the first application of this technology on MFS patients. Larger data are needed to confirm our findings.