An infant has a continuous machine-type murmur best heard at the left upper sternal border throughout systole and diastole, as well as a bounding pulse and a thrill on palpation. 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 defect (avc)

The correct answer is C. Patent ductus arteriosus (PDA).

Explanation:

The infants with PDA or patent ductus arteriosus characteristically have. sign and symptoms of pulmonary over circulation, bounding pulses and any precordium, in a significant amount.

If pulmonary vascular resistance declined then PDA will have symptoms mentioned in question which is a continuous machine type murmur which can be heard at the left upper sternal border throughout the diastole and systole.

Thus, the correct answer is option C. patent ductus arteriosus.