Drug of choice during anaphylaxis reaction is?

ESIC Nursing Officer 2016 (Shift -2)

Pharmacology

Easy

Appeared in: ESIC Nursing Officer 2016 (Shift -2)

Explanation

Adrenaline (Epinephrine) is the first-line drug for treating anaphylaxis due to its rapid onset and comprehensive mechanism of action.
It acts on alpha-1 receptors to cause vasoconstriction, which reverses hypotension and reduces mucosal edema.
Its action on beta-1 receptors increases heart rate and contractility, improving cardiac output.
Its action on beta-2 receptors causes bronchodilation, relieving respiratory distress, and stabilizes mast cells to prevent further mediator release.

Option B: Atropine is an anticholinergic drug that primarily increases heart rate. It does not address the life-threatening bronchoconstriction or vasodilation seen in anaphylaxis.
Option C: Dopamine is a vasopressor that increases blood pressure, but it is not the first-line treatment for anaphylactic shock. Adrenaline is superior due to its potent bronchodilator effects.
Option D: Sodium bicarbonate is an alkalinizing agent and has no role in the primary management of anaphylaxis. It does not affect the allergic cascade, blood pressure, or airway constriction.

Visual 1: Diagram - Illustrating the mechanism of action of adrenaline on alpha-1, beta-1, and beta-2 receptors and the resulting physiological effects (vasoconstriction, increased heart rate, bronchodilation).
Visual 2: Flowchart - A step-by-step guide for the emergency management of an adult with anaphylaxis, starting from recognition of symptoms to administration of adrenaline and supportive care.

Clinical Relevance

Nursing practice connection: Knowing Pharmacological Management of Anaphylaxis helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Rapid recognition and administration of adrenaline are critical in preventing death from anaphylaxis. Delaying treatment can lead to irreversible shock or airway obstruction.
The preferred route is intramuscular (IM) injection in the anterolateral thigh, as it provides more rapid and reliable absorption than subcutaneous injection.
Nurses must be prepared to monitor the patient closely after adrenaline administration for response and potential side effects like tachycardia, palpitations, and anxiety.

How to Approach the Question

First, identify the core clinical condition in the question, which is 'anaphylaxis reaction'.
This is a factual recall question that tests your knowledge of emergency pharmacology.
Recall the pathophysiology of anaphylaxis: it involves massive histamine release causing vasodilation (hypotension) and bronchoconstriction (airway compromise).
Evaluate the options based on which drug directly counteracts these life-threatening effects.
Adrenaline is the only drug listed that provides both vasoconstriction (alpha effect) and bronchodilation (beta effect), making it the definitive first-line treatment.

Concept Tested & Keywords

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