A 32-Year-Old Man Is Evaluated in the Emergency Department Due

A 32-year-old man is evaluated in the emergency department due to fever, night sweats, and chills over the last several days.  The patient has been using intravenous drugs recently as he is "stressed out."  He has otherwise been in good health with no medical problems.  Temperature is 38.3 C (101 F) , blood pressure is 120/80 mm Hg, and pulse is 105/min and regular.  Further evaluation reveals aortic valve endocarditis with an intracardiac abscess and small fistula formation between the aortic root and right ventricle.  Doppler ultrasound interrogation of the fistula will most likely reveal which of the following blood flow patterns?

A) Flow from the aortic root to the right ventricle continuously
B) Flow from the aortic root to the right ventricle only in diastole
C) Flow from the aortic root to the right ventricle only in systole
D) Flow from the right ventricle to the aortic root continuously
E) Flow from the right ventricle to the aortic root only in diastole
F) Flow from the right ventricle to the aortic root only in systole

Correct Answer:

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