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Review Question - QID 108835

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QID 108835 (Type "108835" in App Search)
A 27-year-old G2P1 female gives birth to a baby girl at 33 weeks gestation. The child is somnolent with notable difficulty breathing. Pulse pressure is widened. She is profusely cyanotic. Auscultation is notable for a loud single S2. An echocardiogram demonstrates an enlarged heart and further studies show blood from the left ventricle entering the pulmonary circulation as well as the systemic circulation. Which of the following processes was most likely abnormal in this patient?