A nurse is caring for a patient on warfarin therapy with an INR of 5.6. Which medication should be administer… - GMCH Nursing Officer-2025

GMCH Nursing Officer-2025

Pharmacology

Medium

Appeared in: GMCH Nursing Officer-2025

Explanation

Warfarin is an anticoagulant that works by inhibiting vitamin K-dependent clotting factors.
An INR of 5.6 is significantly above the therapeutic range of 2.0-3.0, indicating a high risk of bleeding.
Vitamin K (phytonadione) is the specific antidote for warfarin toxicity.
Administering Vitamin K helps the liver synthesize new clotting factors, thereby reversing the anticoagulant effect of warfarin and lowering the INR.

Option B: Protamine sulfate is an antidote, but it specifically neutralizes heparin, not warfarin.
Option C: While Fresh Frozen Plasma (FFP) can reverse warfarin's effects by providing clotting factors, it is not the primary or specific antidote. Its use is typically reserved for situations with active, life-threatening bleeding because it provides immediate factor replacement.
Option D: Heparin is also an anticoagulant. Administering it to a patient who is already over-anticoagulated from warfarin would be extremely dangerous and would further increase the INR and the risk of severe, potentially fatal, bleeding.

Visual 1: Table - Anticoagulants and Their Reversal Agents. A clear table listing common anticoagulants (Warfarin, Heparin, DOACs) and their specific antidotes (Vitamin K, Protamine Sulfate, Andexanet alfa, Idarucizumab) to help learners memorize these critical pairs.
Visual 2: Flowchart - Management of High INR. A decision-making flowchart showing the steps to take based on the INR level and the presence or absence of bleeding, guiding the choice between holding warfarin, administering oral Vitamin K, or using IV Vitamin K and FFP.

Clinical Relevance

Nursing practice connection: Use the key finding related to Management of Warfarin Over-Anticoagulation to guide bedside assessment, documentation, and the next nursing action.
A nurse's primary responsibility in managing warfarin therapy is vigilant monitoring of INR and assessing for signs of bleeding. Promptly recognizing a supratherapeutic INR like 5.6 and knowing the correct antidote is a critical patient safety competency.
Patient education is paramount. Nurses must teach patients about dietary consistency with Vitamin K, the importance of regular INR checks, and signs of bleeding to report immediately. This empowers patients to be active participants in their safety.
What if the patient's INR was 5.6 but they also had active, severe bleeding (e.g., hematemesis)? The priority would shift. In addition to administering IV Vitamin K, immediate transfusion of Fresh Frozen Plasma (FFP) or Prothrombin Complex Concentrate (PCC) would be necessary to rapidly supply clotting factors and control the hemorrhage.

How to Approach the Question

First, identify the key clinical data in the question: the drug (warfarin) and the lab value (INR of 5.6).
Recognize that an INR of 5.6 is significantly elevated (therapeutic is 2.0-3.0), indicating toxicity or over-anticoagulation.
The question asks for the correct medication to administer. This requires recalling the specific antidote for the drug identified.
Evaluate the options: Vitamin K is the known antidote for warfarin. Protamine sulfate is for heparin. FFP is for emergency bleeding. Heparin is another anticoagulant.
Based on this pharmacological knowledge, select the specific antidote for warfarin.
Eliminate the other options by identifying their correct indications, confirming they are inappropriate for this specific scenario.

Concept Tested & Keywords

Concept Tested: Management of Warfarin Over-Anticoagulation
Stem keywords: warfarin therapy, INR of 5.6
Lead-in keywords: Which medication
Clinical cues: INR of 5.6 signifies a supratherapeutic level, increasing the risk of hemorrhage.

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