UPPSC-2021: Which one is the most important drug in the management of anaphylactic shock?

UPPSC-2021

Pharmacology

Easy

Appeared in: UPPSC-2021

Explanation

Adrenalin (epinephrine) is the first-line, life-saving drug for treating anaphylactic shock due to its rapid onset and multi-system effects.
It acts as a physiological antagonist to histamine and other inflammatory mediators, reversing the life-threatening manifestations of anaphylaxis.
Its alpha-adrenergic action causes vasoconstriction, which increases peripheral vascular resistance, raises blood pressure, and reduces mucosal edema (e.g., in the larynx).
Its beta-adrenergic action leads to potent bronchodilation, which alleviates wheezing and dyspnea, and increases cardiac output and heart rate.

Option A: Atropine is an anticholinergic drug used to treat symptomatic bradycardia. It does not reverse the widespread vasodilation, increased capillary permeability, or bronchoconstriction characteristic of anaphylaxis.
Option C: Deriphylline is a methylxanthine bronchodilator. It is considered a second or third-line agent for bronchospasm and is much less effective and slower-acting than adrenalin. It does not have the vasoconstrictive effects needed to treat shock.
Option D: Similar to deriphylline, aminophylline is a methylxanthine used as a bronchodilator. It is not the first-line drug for anaphylaxis due to its slow onset, narrow therapeutic window, and potential for toxicity (e.g., arrhythmias, seizures).

Clinical Relevance

Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing First-line drug therapy for anaphylactic shock in acute care settings.
Immediate administration of intramuscular adrenalin into the mid-anterolateral thigh is the single most important intervention to prevent morbidity and mortality from anaphylaxis. Any delay can be fatal.
Nurses must be able to recognize the signs of anaphylaxis promptly (e.g., sudden onset of hives, angioedema, wheezing, hypotension after exposure to a trigger) and be prepared to administer adrenalin without delay.
Patient education is a critical nursing role, especially for patients being discharged after an anaphylactic episode. This includes teaching them how to use an adrenalin auto-injector and the importance of avoiding known triggers.

How to Approach the Question

First, identify the question type. This is a clinical priority question asking for the 'most important' drug in a life-threatening emergency.
Next, analyze the clinical condition presented: 'anaphylactic shock'. This is a severe, rapid, multi-system allergic reaction involving cardiovascular collapse and respiratory compromise.
Recall the established treatment algorithm for this emergency. The cornerstone of therapy is a drug that acts rapidly to reverse the underlying pathophysiology: vasodilation, bronchoconstriction, and mucosal edema.
Evaluate each option based on its mechanism of action and role in this specific emergency:
Adrenalin (epinephrine) is a potent alpha and beta-adrenergic agonist that directly counteracts all major life-threatening features of anaphylaxis.
Atropine primarily targets bradycardia, which is not the central problem.

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