An infant has a crescendo-decrescendo systolic ejection murmur located between the second and third intercostal spaces along the left sternal border.A wide fixed splitting of the second heart sound is also found.These clinical findings are consistent with which congenital heart defect?
A) Atrial septal defect (ASD)
B) Ventricular septal defect (VSD)
C) Patent ductus arteriosus (PDA)
D) Atrioventricular canal (AVC) defect

Question

Quizplus · Accepted Answer

Because most children with ASD are asymptomatic,diagnosis is usually 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 and causing prolonged ejection time and a delay of pulmonic valve closure.The presentations of other congenital heart defects are not consistent with the described symptoms.

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