A 68-Year-Old Man Undergoes Successful Mechanical Prosthetic Aortic Valve Replacement

A 68-year-old man undergoes successful mechanical prosthetic aortic valve replacement for severe aortic valve stenosis. After the procedure, he is started on an oral medication and instructed that he should take it for the rest of his life and avoid consuming large amounts of dark-green, leafy vegetables. Which of the following laboratory parameters should be regularly monitored to guide dosing of this drug?

A) Anti-factor Xa activity
B) Thrombin time
C) Activated partial thromboplastin time
D) D-dimer
E) Prothrombin time

Correct Answer:

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