A 50-year-old man has noted increasing swelling of his lower legs along with shortness of breath for 5 months. On physical examination he is afebrile, but diffuse crackles are heard over the lung bases. His heart rate is 80/minute and regular, with no murmurs, rubs, or gallops. A chest radiograph reveals an increased size to the right heart border, along with bilateral pleural effusions. Laboratory studies show a serum troponin I of <0.4 ng/mL. Which of the following conditions is he most likely to have?

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