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Objective Percutaneous patent foramen ovale (PFO) closure is a procedure widely used to prevent recurrence of cryptogenic stroke. Since December 2019, the Amplatzer PFO occluder device has been available in Japan through medical insurance. However, data on the clinical experience with this device are lacking, as it has been approved for use in only a limited number of institutions. This study assessed the clinical data of Japanese patients who underwent PFO closure using the Amplatzer PFO occluder. Methods Between February and October 2020, 14 patients at our institution underwent percutaneous PFO closure using the Amplatzer PFO occluder. The procedural characteristics, safety, and adverse events were retrospectively analyzed. Results The mean age of the patients was 52.4±13.3 years old, and 57.1% were women. Deep vein thrombosis was revealed in 2 patients, and the risk of paradoxical embolism score was 6.6±1.2 points. The PFO height and tunnel length were 2.3±1.4 mm and 11.5±4.1 mm. All patients had a PFO during the bubble study of grade &gt;3 at the Valsalva maneuver on transthoracic echocardiography or transesophageal echocardiography. The average diameter of the PFO measured using a stiff guidewire and sizing balloon was 5.1±1.3 and 7.9±2.3 mm, respectively. Almost all cases (92.9%) were performed with a 25-mm device and without significant complications within approximately 1 hour. Conclusion Percutaneous closure using Amplatzer PFO occluder is a safe procedure for Japanese patients. However, further investigations with a larger sample and longer follow-up are needed to confirm this result.

internal medicine

Clinical Experience of Percutaneous Patent Foramen Ovale Closure Using the Amplatzer PFO Occluder in Japanese Patients to Prevent the Recurrence of Cryptogenic Stroke