Primary outcomes : Determining the incidence of SAN and AVN dysfunction before and after percutaneous ASD closure Comparing ECG and EP parameters of SAN and AVN before and after percutaneous ASD closure Secondary outcomes : Assessing clinical, echocardiographic and procedural risk factors affecting the AVN function after ASD closure device implantation Determining the incidence of supraventricular arrhythmia inducibility before and after percutaneous ASD closure
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incidence of SAN dysfunction
Timeframe: baseline
incidence of AVN dysfunction
Timeframe: baseline