Pharmacology · single question
Which mechanism explains the bleeding tendency?
Chief complaint: 'my gums bleed a lot when I brush'; bleeding on probing; patient takes warfarin.
Show answer and explanation
Correct answer: A. Inhibition of vitamin K
Warfarin → vitamin K antagonism → bleeding tendency.
- A. Correct. Warfarin inhibits vitamin K–dependent clotting factor synthesis, increasing bleeding (reflected by elevated INR).
- B. That is aspirin's mechanism; warfarin works via vitamin K.