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A 58-year-old man has had an enlarging abdomen for several months. He has experienced no abdominal or chest pain. On physical examination he has a non-tender abdomen with no masses palpable, but there is a fluid thrill. An abdominal Ultrasound Scan shows a large abdominal fluid collection with a small cirrhotic liver. A chest X-ray shows a globally enlarged heart. Which of the following conditions is most likely to be present?
Answer: Dilated cardiomyopathy