【单选题】A 56-year-old man presents to the emergency room with 1 hour of chest pain. Laboratory studies show an increased leukocyte count and increased serum levels of cardiac enzymes. ECG confirms a massive t...
A.
Collagen-rich scar tissue
B.
Extensive infiltration of myocardium with mononuclear cells
C.
Necrosis of cardiac myocytes and infiltrates of neutrophils
D.
No obvious changes evident by light microscopy
E.
Proliferation of fi broblasts and capillary endothelial cells
【单选题】A 56-year-old man experiences episodes of severe substernal chest pain every time he performs a task that requires moderate exercise. The episodes have become more frequent and severe over the past ye...
【单选题】A 56-year-old man has had increasing difficulty breathing for the past week. On physical examination he has no fever. Auscultation of his chest reveals diminished breath sounds and dullness to percuss...