A patient receiving anticoagulant Heparin in postoperative ward. Which one of the following medicine should available as antidote of heparin toxicity?

1. A

   Protamine sulphate

2. B

   Vitamin K

3. C

   Warfarin

4. D

   Naloxone

Appeared in: NORCET 3 - 2022 (Shift-2)

Explanation

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• Protamine sulphate is the specific pharmacological antidote for heparin overdose.
• It is a strongly basic (positively charged) protein that chemically binds to the acidic (negatively charged) heparin molecule.
• This binding forms a stable and inactive salt complex, which neutralizes the anticoagulant effect of heparin.
• The reversal of anticoagulation is rapid, occurring within about 5 minutes of IV administration.
• The standard dosage is approximately 1 mg of protamine for every 100 units of heparin remaining in the body.

Why Other Options Were Wrong

• Option B: Vitamin K is the antidote for the oral anticoagulant warfarin (Coumadin), not heparin.
• Option C: Warfarin is an anticoagulant itself and would worsen the bleeding risk, not reverse it.
• Option D: Naloxone is an opioid antagonist used to reverse respiratory depression and other effects of opioid overdose (e.g., morphine, fentanyl, heroin).

Related Visual

• Visual 1: Infographic - A chart showing common medications and their specific antidotes (e.g., Heparin-Protamine, Warfarin-Vitamin K, Opioids-Naloxone). This helps in memorizing key pairs.
• Visual 2: Diagram - A simple chemical diagram illustrating a positively charged protamine molecule binding to a negatively charged heparin molecule to form a neutral, inactive complex.

Clinical Relevance

• Nursing practice connection: Use the key finding related to Pharmacology: Antidote for Heparin Toxicity to guide bedside assessment, documentation, and the next nursing action.
• Nurses must know the antidotes for high-alert medications like heparin. In an emergency, rapid identification and administration are critical to prevent life-threatening hemorrhage.
• Protamine sulphate must be administered slowly via IV infusion (not exceeding 50 mg over 10 minutes) as rapid administration can cause severe hypotension, bradycardia, and anaphylactoid reactions.
• What if the patient had heparin-induced thrombocytopenia (HIT)? In that case, protamine sulphate would not be the primary treatment. The heparin must be stopped, and an alternative anticoagulant like argatroban would be started. Protamine is for reversing the anticoagulant effect, not for treating HIT.

How to Approach the Question

• First, identify the key drug in the question stem, which is 'Heparin'.
• Next, identify the core question being asked, which is to find the 'antidote' for heparin 'toxicity'.
• This is a factual recall question. Access your knowledge of pharmacology and common drug-antidote pairs.
• Evaluate each option: Protamine sulphate is known as the heparin antagonist. Vitamin K is for warfarin. Warfarin is another anticoagulant. Naloxone is for opioids.
• Based on this direct recall, select Protamine sulphate as the correct answer.

Concept Tested & Keywords

• Concept Tested: Pharmacology: Antidote for Heparin Toxicity
• Stem keywords: Heparin, anticoagulant, postoperative, antidote, toxicity
• Lead-in keywords: Which one of the following
• Clinical cues: The care setting changes urgency, monitoring level, and the expected nursing action.

Question ID

QCktqOxRgR678aJgi9ShnP

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