A 39-year-old male presents to the emergency department with sudden onset of pleuritic chest pain that worsens with a supine position and relieves with leaning forward. He has no significant medical history except for a recent upper respiratory tract infection. He is a chronic smoker but denies any alcohol use. His temperature is 38.1°C (100.6°F). Laboratory tests show elevated C-reactive protein. An ECG is obtained and shown below.
Which of the following is the most likely diagnosis?
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