Inflammatory mediators NOT involved in the pathogenesis of asthma are called?

DSSSB - 29 August 2019 (Shift-1)

Medical Surgical Nursing

Medium

Appeared in: DSSSB - 29 August 2019 (Shift-1)

Explanation

Adrenaline (epinephrine) is a hormone and neurotransmitter, not an inflammatory mediator that causes asthma.
It functions as a potent bronchodilator by stimulating beta-2 adrenergic receptors located on the smooth muscle of the airways.
This stimulation leads to the relaxation of airway smooth muscle, which counteracts the bronchoconstriction caused by inflammatory mediators.
Due to its bronchodilatory effect, adrenaline is used as a therapeutic agent to treat acute, severe asthma attacks and anaphylaxis.

Option A: Leukotrienes are key inflammatory mediators in asthma. They are significantly more potent than histamine in causing prolonged bronchoconstriction, increased vascular permeability, and mucus secretion.
Option C: Histamine is a well-known inflammatory mediator released from mast cells during the early phase of an asthmatic reaction. It causes immediate bronchoconstriction and increases vascular permeability.
Option D: Prostaglandins, specifically Prostaglandin D2 (PGD₂), are produced by mast cells and act as inflammatory mediators that contribute to bronchoconstriction and vasodilation in the airways.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pathogenesis of asthma and the role of inflammatory mediators versus therapeutic agents as background academic context rather than a clinical decision trigger.
Understanding this distinction is critical for nursing practice. Nurses administer bronchodilators like adrenaline or salbutamol to provide rapid relief from bronchospasm, while anti-inflammatory drugs (e.g., corticosteroids, leukotriene antagonists) are used for long-term control of the underlying inflammation.
Nurses must educate patients on the difference between 'reliever' inhalers (bronchodilators) and 'preventer' inhalers (anti-inflammatories) to ensure proper management of their asthma.
What if? If a patient with asthma is prescribed a non-selective beta-blocker (e.g., propranolol) for hypertension, it can block the beta-2 receptors in the lungs. This action prevents the natural bronchodilatory effects and can trigger a severe, life-threatening asthma attack.

How to Approach the Question

First, identify the negative keyword 'NOT' in the question stem. This signals that you must find the option that is the exception.
The core concept is 'inflammatory mediators in the pathogenesis of asthma'. This means you are looking for a substance that does not cause or contribute to airway inflammation in asthma.
Evaluate each option's role. Recall or deduce if the substance causes inflammation/bronchoconstriction or if it has an opposing effect.
Leukotrienes, Histamine, and Prostaglandins are all classic examples of substances that promote inflammation and bronchoconstriction.
Adrenaline is widely known as a 'fight-or-flight' hormone that has a bronchodilatory effect, meaning it opens the airways.
Conclude that Adrenaline is the correct answer because its function is therapeutic (relieving bronchospasm) rather than pathogenic (causing inflammation).

Concept Tested & Keywords

Concept Tested: Pathogenesis of asthma and the role of inflammatory mediators versus therapeutic agents.
Stem keywords: Inflammatory mediators, pathogenesis, asthma
Lead-in keywords: NOT involved
Negative lead-in flag: The question asks to identify the substance NOT involved in the pathogenesis of asthma, which is a negative lead-in.

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E6 Pathology- ROBBINS & COTRAN PATHOLOGIC BASIS OF DISEASE 10TH Ed pp. 95-97, 686-688