An infant has a crescendo-decrescendo systolic ejection murmur located between the second and third intercostal spaces along the left sternal border.There is also a wide fixed splitting of the second heart sound.These clinical findings are consistent with which congenital heart defect?

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Because most children with ASD are asymptomatic, diagnosis usually is made during a routine physical examination by the auscultation of a crescendo-decrescendo systolic ejection murmur that reflects increased blood flow through the pulmonary valve. The location of the murmur is between the second and third intercostal spaces along the left sternal border. A wide fixed splitting of the second heart sound is also characteristic of ASD, reflecting volume overload to the right ventricle (RV), causing prolonged ejection time and delay of pulmonic valve closure.

An Infant Has a Crescendo-Decrescendo Systolic Ejection Murmur Located Between