Clinical Case #001
Supratherapeutic INR Before a Dental Procedure
A 68-year-old male with atrial fibrillation presents to the pharmacy for medication counseling.
Current medications:
Warfarin 5 mg daily
Metoprolol succinate 50 mg daily
Lisinopril 20 mg daily
Recent laboratory results:
INR: 6.1
Hemoglobin: 13.8 g/dL
Platelets: 220,000/mm³
The patient denies:
Bleeding
Bruising
Hematuria
Melena
He reports that he is scheduled for a routine dental extraction tomorrow morning.
Question
What is the MOST appropriate next step?
A) Continue warfarin and proceed with the dental procedure.
B) Hold warfarin and administer oral vitamin K.
C) Administer IV vitamin K and four-factor PCC immediately.
D) Discontinue warfarin permanently.
Answer
✅ B) Hold warfarin and administer oral vitamin K.
Discussion
This patient has a significantly elevated INR (6.1) but has no evidence of active bleeding.
According to anticoagulation management principles, patients with:
INR >5 but <10
No clinically significant bleeding
are generally managed by:
Holding warfarin
Considering low-dose oral vitamin K when rapid INR correction is desirable
In this case, the patient is scheduled for an invasive dental procedure the following day, making INR reduction important.
IV vitamin K and four-factor PCC are typically reserved for patients with:
Major bleeding
Life-threatening bleeding
Urgent surgery requiring immediate reversal
Permanent discontinuation of warfarin is not indicated because the elevated INR is a temporary management issue rather than a contraindication to anticoagulation.
NAPLEX Pearl
When evaluating elevated INR values, always answer two questions first:
Is the patient bleeding?
How quickly must anticoagulation be reversed?
The presence or absence of bleeding often determines whether management involves simply holding warfarin or using reversal agents such as vitamin K and PCC.
Clinical Reasoning Takeaway
Many NAPLEX questions are not testing whether you know an INR target.
They are testing whether you can distinguish between:
Elevated INR without bleeding
Elevated INR with bleeding
because the management strategies are dramatically different.
High INR alone does not automatically require aggressive reversal.
Tags: Warfarin • INR Management • Anticoagulation • Atrial Fibrillation • NAPLEX • Clinical Reasoning
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