Answer 5 Atrial septal defect. The systolic ejection murmur produced by an atrial septal defect results from increased flow across the pulmonic valve. The right ventricle has increased filling as blood is shunted from the left atrium to the right atrium and finally into the right ventricle. There is fixed splitting of S2 because of continued delay in the closure of the pulmonic valve. Click here to return to the questions
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