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Atrial Fibrillation

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Questions and Answers

Which clotting factors does warfarin inhibit?

Factor IX

Factor II (correct)

Factor V

Factor VIII

What is the target International Normalized Ratio (INR) for outpatients on warfarin with atrial fibrillation (AF)?

2.0-3.0 (correct)

3.0-4.0

4.0-5.0

1.0-2.0

What can excessive anticoagulation with warfarin cause?

Arrhythmia

Hypertension

Bleeding (correct)

Thrombosis

Why is warfarin contraindicated in pregnancy?

It has teratogenicity and fetal bleeding risk (D) Signup and view all the answers

What is the purpose of a 'heparin bridge' at the start of warfarin therapy?

To decrease the risk of thrombus formation (C) Signup and view all the answers

Which vitamin K-dependent coagulation factors does warfarin inhibit?

Factor II,VII, IX and X (D) Signup and view all the answers

What is the main indication for using warfarin?

All of the above (D) Signup and view all the answers

Which test is used to monitor unfractionated heparin?

Activated partial thromboplastin time (aPTT) (B) Signup and view all the answers