Ted Smith is а 48-yeаr-оld whо presents with cоmplаints of sharp chest pain in his mid-sternum for 2 days duration. The pain has been steady and radiates to his left arm, worsened by swallowing and deep breathing; relieved by sitting up or leaning forward. He notes occasional tightness in his chest but denies shortness of breath, cough, or diaphoresis. This is his first episode of chest pain, but he worries that he may be having a heart attack because his father died of an MI at age 51. Based on his history, your top 4 differential diagnoses would include: