A 45-year-old man has had increasing fatigue, exertional dyspnea, and episodes of mild chest pain for...

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A 45-year-old man has had increasing fatigue, exertional dyspnea, and episodes of mild chest pain for the past 7 months. On physical examination, he is afebrile. His pulse is 79/min, respirations are 15/min, and blood pressure is 125/75 mm Hg. Laboratory studies show normal levels of serum troponin I, glucose, creatinine, and total cholesterol. The representative microscopic appearance of the myocardium with a Prussian blue stain is shown in the figure. Echocardiography would most likely show which of the following functional cardiac disturbances? (A) Dynamic obstruction to left ventricular outflow ☐ (B) Reduced ventricular compliance resulting in impaired ventricular filling in diastole (C) Mitral and tricuspid valvular insufficiency (D) Lack of ventricular expansion during diastole □ (E) Reduced ejection fraction from decreased contraction A 45-year-old man has had increasing fatigue, exertional dyspnea, and episodes of mild chest pain for the past 7 months. On physical examination, he is afebrile. His pulse is 79/min, respirations are 15/min, and blood pressure is 125/75 mm Hg. Laboratory studies show normal levels of serum troponin I, glucose, creatinine, and total cholesterol. The representative microscopic appearance of the myocardium with a Prussian blue stain is shown in the figure. Echocardiography would most likely show which of the following functional cardiac disturbances? (A) Dynamic obstruction to left ventricular outflow ☐ (B) Reduced ventricular compliance resulting in impaired ventricular filling in diastole (C) Mitral and tricuspid valvular insufficiency (D) Lack of ventricular expansion during diastole □ (E) Reduced ejection fraction from decreased contraction

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