Which is the anti coagulant drug?

Appeared in: AIIMS Raipur NO- 2019 (shift 3rd)

Explanation

Heparin is a powerful anticoagulant, a class of drugs that prevent or reduce the coagulability of blood.
Its primary mechanism of action is to potentiate the activity of antithrombin III.
This enhanced antithrombin III then inactivates key clotting factors, primarily thrombin (Factor IIa) and Factor Xa.
By inhibiting these factors, Heparin effectively prevents the conversion of fibrinogen to fibrin, which is the meshwork that forms a blood clot.
It is used clinically to treat and prevent conditions like Deep Vein Thrombosis (DVT) and Pulmonary Embolism (PE).

Option A: Soda bi carb (Sodium Bicarbonate) is an alkalinizing agent, not an anticoagulant. Its purpose is to correct acid-base imbalances.
Option B: Atropine is an anticholinergic drug. It works on the autonomic nervous system, primarily to increase a slow heart rate, and has no effect on the blood clotting cascade.
Option D: Diazepam is a benzodiazepine that acts on the central nervous system. It is used for its sedative, anti-anxiety, muscle relaxant, and anticonvulsant effects.

Clinical Relevance

Nursing practice connection: Knowing Pharmacology: Identification of Anticoagulant Drugs helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses must know the specific laboratory tests used to monitor different anticoagulants: aPTT for heparin and PT/INR for warfarin. Failure to monitor can lead to hemorrhage or ineffective treatment.
A critical nursing responsibility is to assess for and educate patients on the signs of bleeding, such as unusual bruising, black/tarry stools (melena), or blood in the urine (hematuria).
Knowing the correct antidote for each anticoagulant is a vital patient safety measure. Protamine sulfate reverses heparin, and Vitamin K reverses warfarin.

How to Approach the Question

This is a factual recall question that tests your knowledge of drug classifications.
First, identify the key term in the question: 'anti coagulant drug'.
Recall the definition of an anticoagulant: a substance that prevents blood from clotting.
Systematically review each option and categorize it based on its primary pharmacological class.
Option A, Soda bi carb, is an antacid/buffer. Option B, Atropine, is an anticholinergic. Option D, Diazepam, is a benzodiazepine.
Option C, Heparin, is a well-known anticoagulant. Therefore, it is the correct answer.

Concept Tested & Keywords

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E6 Pharmacology Nurses Shanbhag 3e p. 226-228

E6 Physiology Essentials Sembulingam 10e Part 1 p. 141-143

E6 Pharmacology Nursing Lilley 11e Part 2 p. 111-113

Practise the full AIIMS Raipur NO- 2019 (shift 3rd)

Attempt every question from this paper in a timed mock, then review the full solution for each one.