In this video, Dr. Radha Krishnan, Director, Pediatric Cardiologist at Fortis Escorts Heart Institute, New Delhi, will talk on the ASD closure and when it is done. ASD is a true defect in atrial septum. The atrial defect is closed when it causes an enlargement of the right atrium and right ventricle. He will also explain that the period for closing ASD is after 2 years of age. Sometimes ASD can cause pulmonary hypertension or the baby is symptomatic, then the closure of atrial septum defect can be done before 2 years of age.