A 6-hour-old term female neonate born to a 32-year-old mother develops sudden onset of severe respiratory distress and shock. On examination, the infant is pale, hypotensive (BP 45/28 mmHg), with weak pulses and poor perfusion. Auscultation reveals muffled heart sounds. Chest X-ray shows cardiomegaly with pulmonary edema. Echocardiography reveals a large left-to-right shunt at the ductal level with reversal of flow in the descending aorta. Which of the following best explains the acute hemodynamic collapse in this neonate?