The commonest drug which is administered during an anaphylactic reaction

ESIC Nursing Officer - 2019 (Shift-2)

Pharmacology

Easy

Appeared in: ESIC Nursing Officer - 2019 (Shift-2)

Explanation

Injection Epinephrine is the first-line, life-saving drug for treating anaphylaxis.
It is the only medication that rapidly reverses all major life-threatening features: airway swelling (laryngeal edema), difficulty breathing (bronchospasm), and low blood pressure (hypotension).
Epinephrine works as a potent vasopressor (constricting blood vessels to raise blood pressure) and bronchodilator (opening the airways).
Guidelines universally recommend immediate administration of intramuscular (IM) epinephrine in the mid-outer thigh as soon as anaphylaxis is suspected.
Delaying epinephrine administration is associated with increased morbidity and mortality.

Option A: Anticonvulsants are used to manage seizures by stabilizing nerve cell membranes or modulating neurotransmitters. They have no effect on the pathophysiological mechanisms of anaphylaxis, such as mast cell degranulation, vasodilation, or bronchoconstriction.
Option C: Antibiotics are used to treat bacterial infections. They are not used to treat an acute allergic reaction. In fact, antibiotics like penicillin are one of the most common triggers for drug-induced anaphylaxis.
Option D: Diuretics increase urine output to remove excess fluid, which is used to treat conditions like heart failure or hypertension. In anaphylaxis, the patient experiences severe vasodilation and a drop in blood pressure. A diuretic would further reduce intravascular volume, worsening the hypotension and shock.

Visual 1: Flowchart: Step-by-step emergency management of anaphylaxis, starting with epinephrine administration.
Visual 2: Anatomical Diagram: Illustration showing the correct location for an intramuscular injection of epinephrine in the anterolateral thigh (vastus lateralis muscle).
Visual 3: Infographic: Comparing the mechanisms of action of epinephrine, antihistamines, and corticosteroids in anaphylaxis to highlight why epinephrine is the first-line choice.

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.
Immediate recognition and administration of epinephrine are critical nursing responsibilities in anaphylaxis. There should be no delay in administration.
Nurses must be prepared to monitor the patient for response to treatment and for potential biphasic reactions, where symptoms recur hours after the initial reaction has resolved.
Patient education is a key nursing role, including teaching patients with known severe allergies how to avoid triggers and how to use an epinephrine auto-injector (e.g., EpiPen).

How to Approach the Question

First, identify the core clinical condition in the question: 'anaphylactic reaction'. This is a medical emergency.
Next, recall the first-line, life-saving treatment for this specific emergency. The question asks for the 'commonest' drug, which in this context means the standard, primary treatment.
Evaluate the options based on their pharmacological class and primary use.
Option A (Anticonvulsant) is for seizures. Eliminate it.
Option B (Epinephrine) is a potent adrenergic agonist used in emergencies like cardiac arrest and anaphylaxis. This is a strong candidate.
Option C (Antibiotic) is for bacterial infections. Eliminate it.

Concept Tested & Keywords

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