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A 45-year-old woman comes to the emergency department with severe menorrhagia for 3 days. She also reports dizziness. She has hypertension, for which she takes lisinopril. She appears pale. Her temperature is 37.5˚C (99.5˚F), pulse is 110/min, and blood pressure is 100/60 mmHg. Pulse oximetry shows an oxygen saturation of 98% on room air. Pelvic examination shows vaginal vault with dark maroon blood and clots but no active source of bleeding. Her hemoglobin concentration is 5.9 g/dL. Crystalloid fluids are administered and she is transfused with 4 units of crossmatched packed red blood cells. Two hours later, she has shortness of breath and dull chest pressure. Her temperature is 37.6°C (99.7°F), pulse is 105/min, and blood pressure is 170/90 mm Hg. Pulse oximetry on room air shows an oxygen saturation of 92% on room air. Cardiac examination shows an S3 gallop. Diffuse crackles are heard over the lower lung fields on auscultation. An x-ray of the chest shows bilateral hazy opacities. An ECG shows no abnormalities. Which of the following is the most likely explanation of this patient's symptoms?

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