Which of the following medicine should be administered in a client with atrial fibrillation on priority basis to reduce the risk of MI?

1. A

   Amiodarone

2. B

   Heparin

3. C

   Atropine

4. D

   Adrenaline

Appeared in: NORCET-7 Mains-2024

Explanation

Listen in Hindi

• Atrial fibrillation (AF) involves ineffective atrial quivering instead of coordinated contraction, leading to blood stasis.
• This stasis, particularly in the left atrial appendage, promotes the formation of blood clots (thrombi).
• These clots can dislodge and travel through the bloodstream (embolize) to the coronary arteries, causing a myocardial infarction (MI), or to the brain, causing a stroke.
• Heparin is a rapid-acting anticoagulant that prevents the formation and growth of these clots, making it the priority intervention to reduce the immediate risk of life-threatening embolic events.

Why Other Options Were Wrong

• Option A: This is an antiarrhythmic drug for rhythm control. Restoring normal rhythm before ensuring the patient is anticoagulated can dislodge pre-existing clots, increasing the risk of MI or stroke.
• Option C: It is used to treat symptomatic bradycardia (slow heart rate). In AF, the ventricular rate is typically rapid, so atropine would worsen the tachycardia.
• Option D: It is a potent sympathomimetic used for cardiac arrest or anaphylaxis. It dramatically increases heart rate and contractility, which is dangerous in a patient with AF.

Related Visual

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Priority pharmacological intervention for preventing thromboembolism in atrial fibrillation as background academic context rather than a clinical decision trigger.
• The nurse's priority is to mitigate the life-threatening risk of embolism in AF, which takes precedence over rhythm control in a stable patient.
• Administering a heparin infusion requires diligent monitoring of the activated partial thromboplastin time (aPTT) to ensure therapeutic levels and prevent bleeding complications.
• Nurses must implement bleeding precautions (e.g., soft toothbrush, electric razor, fall prevention) for any patient on anticoagulant therapy.

How to Approach the Question

• First, identify the patient's primary diagnosis from the question stem: Atrial Fibrillation (AF).
• Next, recall the most immediate and life-threatening complication associated with AF. This is the formation of blood clots (thromboembolism) due to blood stasis in the atria.
• Understand that these clots can travel to the brain (causing a stroke) or the heart's own arteries (causing a Myocardial Infarction - MI).
• The question asks for the 'priority' medication to 'reduce the risk of MI'. This directs you to find the drug that prevents the underlying cause of the embolic MI, which is the clot.
• Evaluate the options: Amiodarone treats the rhythm, not the clot. Atropine and Adrenaline are for different conditions (bradycardia and cardiac arrest, respectively) and would be harmful.
• Conclude that Heparin, an anticoagulant, is the only option that directly and immediately addresses the risk of clot formation, making it the priority.

Concept Tested & Keywords

• Concept Tested: Priority pharmacological intervention for preventing thromboembolism in atrial fibrillation.
• Stem keywords: atrial fibrillation, priority basis, reduce the risk of MI
• Lead-in keywords: priority

Question ID

QP031yPMyCpl5E--IbBjf1

Copy ID

Reference Book

E6 Medicine Davidson Principles Practice 24e p. 492-494

E6 Pharmacology Nursing Lilley 11e Part 2 p. 95-97