Real-World Patent Foramen Ovale (PFO) Closure in Japan - 30-Day Clinical Outcomes From the Amplatzer PFO Occluder Japan Post-Marketing Surveillance Study.

BACKGROUND

The Amplatzer PFO Occluder was approved for marketing in Japan in May 2019, and the Amplatzer PFO Occluder Japan Post-marketing Surveillance (PFO Japan PMS) study was initiated in December 2019. This analysis presents 30-day clinical outcomes for PFO Japan PMS study patients.

METHODS AND RESULTS

PFO Japan PMS is a prospective single-arm non-randomized multicenter clinical study. Eligible patients were indicated for patent foramen ovale (PFO) closure and underwent an implant attempt with the Amplatzer PFO Occluder. Technical success was defined as successful delivery and release of the occluder; procedural success was defined as technical success with no serious adverse events (SAEs) within 1 day of the procedure. The primary safety endpoint includes predefined device- and/or procedure-related SAEs through 30 days after the procedure. From December 2019 to July 2021, 500 patients were enrolled across 53 Japanese sites. The mean (±SD) patient age was 52.7±15.4 years, and 29.8% of patients were aged >60 years. Technical and procedural success rates were both high (99.8% and 98.8%, respectively). Further, there was only one primary safety endpoint event (0.2%): an episode of asymptomatic paroxysmal atrial fibrillation that occurred 26 days after the procedure.

CONCLUSIONS

In this real-world Japanese study with almost one-third of patients aged >60 years, PFO closure with the Amplatzer PFO Occluder was performed successfully and safely, with a low incidence of procedure-related atrial arrhythmias.