Outcome of transcatheter atrial septal defect closure in a nationwide cohort

Background: Transcatheter (TC) atrial septal defect (ASD) closure has been the mainstay of therapy for secundum-type ASDs for over 20 years. Aims: This nationwide cohort evaluated the long-term outcome of transcatheter-closed ASDs. Methods: The study enrolled every transcatheter ASD closure performed in Finland from 1999 to 2019. Five age, sex, and municipality-matched controls per ASD patient were gathered from the general population. The median follow-up period was 5.9 years (range 0–20.8). We used the hospital discharge register to gather all hospital visits and diagnoses. Closure complications and echocardiographic changes were collected from the electronic health records. Results: Transcatheter ASD closure was performed in 1000 patients (68.5% females) during the study period. The median (range) age at the time of the procedure was 37.9 (1.8–87.5) years. ASD patients had an increased risk for new-onset atrial fibrillation (RR 2.45, 95% CI: 1.84–3.25), migraine (RR 3.61, 95% CI: 2.54–5.14), ischemic heart disease (RR 1.73, 95% CI: 1.23–2.45), ventricular fibrillation/tachycardia (RR 3.54 (95% CI: 1.48–8.43) and AV conduction disorder (RR 3.60, 95% CI: 1.94–6.70) compared to the control cohort. Stroke risk was not increased (RR 1.36, 95% CI: 0.91–2.03). Adverse events occurred in 6.3% (n = 63) of the patients, including four erosions and ten device embolizations. Conclusion: After TC closure of ASD, patients had a higher risk of new-onset atrial fibrillation and migraine than controls without ASD. As novel findings, we found an increased risk for ischemic heart disease, AV conduction disorders, and ventricular fibrillation/tachycardia.Key messages Even though patients have an excellent overall prognosis after percutaneous ASD closure, the increased incidence of major comorbidities like atrial fibrillation and heart failure prompts more thorough lifelong follow-up. This study’s novel findings revealed the increased risk for ischemic heart disease, AV conduction disorders, or ventricular tachycardia/fibrillation during the follow-up. Major complications after the closure are rare; erosion is seen in 0.4% of the patients and embolization in 1.0% of the patients.