Paediatric Cardiology Atrial Septal Defect (ASD) – Causes, Symptoms and Treatment by Narayana Health September 29, 2021 September 29, 2021 Atrial Septal Defect (ASD)- A treatable defect! ASD or Atrial Septal Defect or hole in the heart is a congenital (inborn) heart defect. In ASD, a hole is there in…