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Types of ASD (Atrial septal defect)

 Atrial septal defect (ASD) is a defect in the interatrial septum permitting free communication of blood between the atria. Based on the location of the septal defect ASD can be classified into four types.

  1. Ostium secundum ASD is the commonest type of ASD which involves the fossa ovalis, in the mid-septal region. 20% of these cases are associated with mitral valve prolapse (MVP). 
  2. Ostium primum type of ASD is rare, defect is near AV valves. The AV valves may also be deformed.
  3. Sinus venosus type is also rare, defect is seen high in the atrial septum near the entry of superior venacava (SVC).
  4. Coronary sinus type of ASD