ASD is the most common acyanotic heart disease with left to right shunt . Highest qp/qs are seen with ASDs
The shunt begins from left atrium and goes on to complete a circuit.
LA——-ASD———RA————RV———-PA———-PVs———LA
In this circuit all chambers enlarge except the LA . (Inspite of the fact about 200-300 % cardiac output traverses this chamber )
Why ?
Post -test
The most popular answer in the above poll is LA is a transit chamber .
If it is so . . . RA is equally a transit chamber , why it enlarges significantly ?
Dr.S.Venkatesan MD 
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