When intravenous heparin therapy is advised for a patient, the nurse must ensure the availability of ______ in the nursing unit while administering the therapy?

1. A

   Vitamin K

2. B

   Aminocaproic acid

3. C

   Potassium chloride

4. D

   Protamine sulphate

Appeared in: JSSH Staff Nurse - 2019

Explanation

• Protamine sulphate is the specific and rapid-acting antidote for heparin overdose.
• It is a strongly basic (positively charged) protein that directly binds with the strongly acidic (negatively charged) heparin molecule.
• This binding action forms a stable, inactive salt complex, which effectively neutralizes heparin's anticoagulant properties.
• The reversal of heparin's effects begins within 5 minutes of intravenous administration of protamine sulphate.

Why Other Options Were Wrong

• Option A: Vitamin K is the antidote for warfarin, not heparin. It reverses warfarin's effects by restoring the synthesis of vitamin K-dependent clotting factors.
• Option B: Aminocaproic acid is an antifibrinolytic agent used to stop bleeding caused by thrombolytic drugs (clot busters), not anticoagulants like heparin.
• Option C: Potassium chloride is an electrolyte supplement used to correct hypokalemia (low potassium levels) and has no function in reversing anticoagulation.

Related Visual

Clinical Relevance

• Nursing practice connection: Use the key finding related to Antidote for Heparin Therapy to guide bedside assessment, documentation, and the next nursing action.
• Patient Safety: Having the antidote readily available is a critical safety protocol in any unit where heparin infusions are administered. It allows for rapid intervention in case of accidental overdose or life-threatening hemorrhage.
• Nursing Monitoring: The nurse's role includes vigilant monitoring of the activated partial thromboplastin time (aPTT) to keep heparin within the therapeutic range (typically 1.5-2.5 times the control value) and continuous assessment for any signs of bleeding.
• What if?: If a patient receiving heparin has a known allergy to fish (protamine is derived from fish sperm), the risk of an anaphylactic reaction to protamine sulphate is significantly higher. The care team must be prepared for this possibility and consider alternative strategies for reversal.

How to Approach the Question

• First, identify the core of the question: it asks for the specific antidote that must be available during heparin therapy.
• This is a direct recall question from pharmacology, focusing on medication safety and emergency preparedness.
• Systematically evaluate each option based on your knowledge of common anticoagulants and their reversal agents.
• Recall that Vitamin K is the antidote for warfarin.
• Recall that aminocaproic acid is for reversing fibrinolytics.
• Recognize that potassium chloride is an electrolyte and not an antidote in this context.

Concept Tested & Keywords

• Concept Tested: Antidote for Heparin Therapy
• Stem keywords: intravenous heparin therapy, availability, nursing unit, antidote
• Lead-in keywords: BEST, MOST RELEVANT CLUE
• Negative lead-in flag: false

Question ID

QMEcH8HLFzRm54q-EoTIfp

Copy ID

Reference Book

E6 Pharmacology Nursing Lilley 11e Part 2 pp. 108-110, 123-125