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Introduction: Successful closure of atrial septal defect (ASD) improves patients’ functional class and exercise capacity. In this study we evaluate the safety and feasibility of percutaneous device closure of ASDs. Methods: Two hundred fifty six patients with significant ASD according to our criteria were enrolled. The patients were treated using nitinol wire mesh transcatheter devices. Complications were followed for a median of 2.5 years. Results: Success rate was 98.4% with 3 unsuccessful cases and a mean hospital stay of 1.007 ± 0.0004 days. Complication rate was 7.42%. Size of the right ventricle (RV) annulus was significantly decreased 24 hours after intervention (P=0.005). Conclusion: The present report demonstrates that transcatheter closure of ASD is safe and effective.