Methods: Between March 2008 and August 2020, a total of 547 adult patients (193 males, 354 females; median age: 37 years; range, 27.5 to 47 years) with secundum atrial septal defect were retrospectively analyzed. Of these patients, 304 underwent percutaneous defect closure and 243 underwent isolated surgical repairs. Pulmonary arterial hypertension was defined as a noninvasively estimated pulmonary artery systolic pressure of ?40 mmHg at the final follow-up after atrial septal defect closure. Factors associated with pulmonary arterial hypertension were analyzed.

Results: Sixty-nine (12.6%) patients presented with pulmonary arterial hypertension at the final follow-up. A total of 35 (6.4%) patients had persistent atrial fibrillation before atrial septal defect closure, and 22 of these 35 patients had pulmonary arterial hypertension during long-term follow-up. Older age at the time of atrial septal defect closure (HR: 4.76; 95% CI: 2.68-8.44; p<0.001), the presence of persistent atrial fibrillation (HR: 2.18; 95% CI: 1.21-3.91; p=0.009), and greater right ventricular basal diameter (HR: 4.78; 95% CI: 2.57-8.84; p<0.001) were found to be associated with late pulmonary arterial hypertension.

Conclusion: The presence of persistent atrial fibrillation may be used to predict patients at higher risk for pulmonary arterial hypertension after atrial septal defect closure.