Which one is the most important drug in the management of anaphylactic shock?

UPPSC 2023

Pharmacology

Easy

Appeared in: UPPSC 2023

Explanation

Adrenalin (Epinephrine) is the first-line, life-saving drug for anaphylactic shock.
It acts as a physiological antagonist to histamine, rapidly reversing the life-threatening manifestations of severe allergic reactions.
Its action on alpha-1 receptors causes vasoconstriction, which increases blood pressure and reduces mucosal edema (airway swelling).
Stimulation of beta-1 receptors increases heart rate and contractility, improving cardiac output.
Action on beta-2 receptors causes potent bronchodilation, relieving wheezing and improving airflow.

Option A: Atropine is an anticholinergic medication. It does not address the core issues of anaphylaxis, which are massive vasodilation, bronchoconstriction, and capillary leakage.
Option C: Deriphylline is a bronchodilator (a combination of etofylline and theophylline). While it can help with bronchospasm, it is not potent enough and does not counteract the severe hypotension and systemic effects of anaphylactic shock.
Option D: Aminophylline is a methylxanthine bronchodilator. Like Deriphylline, it primarily addresses bronchospasm but has no significant effect on the cardiovascular collapse (severe hypotension) seen in anaphylaxis.

Clinical Relevance

Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Pharmacological Management of Anaphylactic Shock in acute care settings.
Immediate administration of Adrenaline is a critical life-saving nursing action in suspected anaphylaxis; any delay can be fatal.
Nurses must be skilled in recognizing the early signs of anaphylaxis (e.g., urticaria, angioedema, wheezing, hypotension) and be prepared to administer Adrenaline via the correct intramuscular route, typically the anterolateral thigh.
Patient education is vital. For patients with known severe allergies, nurses must teach them and their families how to use an adrenaline auto-injector (like an EpiPen) and the importance of seeking emergency medical care after use.

How to Approach the Question

First, identify the core clinical condition presented in the question: 'anaphylactic shock'.
The question asks for the 'most important' drug, which signals the need to identify the first-line, life-saving intervention.
Recall the pathophysiology of anaphylactic shock: it involves massive vasodilation (causing a drop in blood pressure), bronchoconstriction (causing breathing difficulty), and increased capillary permeability (causing swelling).
Evaluate each drug option based on its ability to counteract these life-threatening effects.
Adrenalin is the only drug listed that provides potent vasoconstriction (alpha-1), increased cardiac output (beta-1), and bronchodilation (beta-2), making it the comprehensive treatment.
Eliminate the other options by identifying their primary use: Atropine is for bradycardia, while Deriphylline and Aminophylline are primarily bronchodilators without the necessary cardiovascular support for shock.

Concept Tested & Keywords

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E6 Pharmacology Nurses Shanbhag 3e p. 83-85

E6 Pharmacology KD Tripathi Essentials 9e Part 1 p. 178-180