ATRIAL SEPTAL DEFECT

1 . ASD patients become symptomatic by age –

-        4^th   - 5^th decade

2. spontaneous closure of ASD occurs by

   -   33%  -  in 1- 2 years

   -   3%  - in 2-4 years

3.due to chances of spontaneous closure  elective repair of ASD can be delayed  upto –

  - 4 years

4. wide and fixed split of   S -2  in ASD is due  to –

     - FIXED SPLIT  due to-  constant volume of blood in RA  in different phases of respiration which passes through  PA.

 this happens due to  -

reciprocal changes in IVC –to – RA  shunt and  Left to right shunt through  ASD  during respiratory cycles 

-        WIDE SPLIT  - is due to prolong emptying of RV  - due to –

§  Increased RV volume  due to shunt

§  Dilated PA with increased   HANGOUT INTERVAL

5. Type of ASD associated with  most commonly associated with  PAPVC  -

-        sinus venosus type of ASD