A 39-Year-Old Man Comes to the Office Due to Increasing

A 39-year-old man comes to the office due to increasing fatigue for the past 2 weeks.  The patient reports no prior medical conditions, although he recently had a self-limiting upper respiratory illness.  He does not use tobacco, alcohol, or illicit drugs and has not traveled recently.  Temperature is 37.2 C (99 F) , blood pressure is 116/66 mm Hg, pulse is 100/min, and respirations are 20/min.  Physical examination reveals lung crackles.  Echocardiography shows no valvular abnormalities and the following parameters: Based on the observed findings, which of the following is most accurate about this patient?

A) Cardiac output is 4 L/min
B) Cardiac output is 6 L/min
C) Left ventricular ejection fraction is 40%
D) Left ventricular ejection fraction is 60%
E) Stroke volume is 40 mL
F) Stroke volume is 60 mL

Correct Answer:

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