Impact of Discontinuation of Antithrombotic Therapy Following Closure of Patent Foramen Ovale in Patients With Cryptogenic Embolism.

No data exist on the optimal duration of antithrombotic therapy (AT) following patent foramen ovale (PFO) closure. We sought to assess the safety of AT discontinuation following PFO closure in patients with a cryptogenic ischemic event. A total of 453 consecutive patients (mean age: 48 ± 13years, men: 51%) who underwent PFO closure due to a cryptogenic ischemic event were included. All patients were on AT following PFO closure (antiplatelet therapy: 92.7%, anticoagulation: 7.3%). Ischemic and bleeding events, and AT were assessed at a median follow-up of 8 (IQR: 4 to 11) years, and follow-up was complete in 96% of patients. Stroke and transient ischemic attack occurred in 4 (0.9%) and 12 (2.6%) patients, respectively, and 27 (6.0%) patients had bleeding events (major in 6 [1.3%] patients, including 4 episodes of intracranial hemorrhage). All major bleeding events occurred under aspirin therapy. A total of 82 patients (18%) stopped the AT at a median of 7 (IQR: 5 to 34) months post-PFO closure (due to a bleeding event or gastrointestinal symptoms: 13 patients, no specific reason: 69 patients), and none of them had any ischemic event after a median time of 7 (IQR 3 to 10) years without any AT. A propensity score matched analysis including 46 patients who discontinued the AT within 1-year post-PFO closure and 120 patients with an ongoing AT showed the lack of differences in ischemic events between groups (0 vs 0.2 stroke/transient ischemic attack per 100 patient-years in the no-AT and AT groups, respectively). In conclusion, in young patients who underwent PFO closure, bleeding events occurred in ∼6% of patients after a median follow-up of 8years. AT was discontinued in about one fifth of patients (most of them within the year following PFO closure), and this was not associated with any increase in ischemic events at long-term follow-up. These results suggest that, in patients without other co-morbidities increasing the risk of stroke, temporary AT following PFO closure may be a reasonable strategy.