milk and stops feeding as if she is tired, only to start sucking again after a few minutes. On chest auscultation, bilateral wheezing is

present. A cardiac murmur starts immediately after the onset of the first heart sound (S1), reaching its maximal intensity at the end of

systole, and waning during late diastole. The murmur is best heard over the second intercostal space and radiates to the left clavicle.

The first heart sound (S1) is normal, while the second heart sound (S2) is obscured by the murmur. The pediatrician suspects a patent

ductus arteriosus. Communication between while of the following arteries is the most likely cause of hemodynamic instability?