What is asthma? - NIMHANS Nursing Officer - 2019

NIMHANS Nursing Officer - 2019

Medical & Surgical Nursing

Easy

Appeared in: NIMHANS Nursing Officer - 2019

Explanation

Asthma is fundamentally a disorder of the airways characterized by increased responsiveness to various stimuli, leading to widespread narrowing (bronchoconstriction).
This airway obstruction is caused by a combination of smooth muscle spasm, mucosal edema and inflammation, and excessive mucus secretion.
The key feature that defines asthma is that this airflow obstruction is typically variable and reversible, either on its own or with medication.
The correct option accurately identifies bronchoconstriction as the direct cause of breathing difficulty in asthma.

Option B: This describes a cardiovascular issue, not a primary respiratory one. While exercise can be a trigger for asthma (known as exercise-induced bronchoconstriction), the root cause of asthma is airway inflammation, not a cardiac abnormality.
Option C: A deficiency of surfactant is the hallmark of Infant Respiratory Distress Syndrome (IRDS), a condition primarily affecting premature newborns. Surfactant reduces surface tension in the alveoli, preventing their collapse, which is a different mechanism and location than the bronchiolar constriction seen in asthma.
Option D: This option is incorrect because a correct definition is provided in the options.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition and Pathophysiology of Asthma as background academic context rather than a clinical decision trigger.
Recognizing asthma as a condition of bronchoconstriction is fundamental for nurses to provide appropriate and timely care, primarily involving the administration of bronchodilators.
Patient education is a key nursing role, focusing on trigger avoidance, proper inhaler technique, and the difference between reliever (bronchodilator) and preventer (anti-inflammatory) medications.
What if? If a patient with known asthma presents with wheezing and also has a history of heart failure, the nurse must be cautious. While bronchodilators are needed for asthma, some can increase heart rate, potentially worsening the cardiac condition. Careful assessment and monitoring are critical.

How to Approach the Question

First, read the question carefully to identify the core concept being asked. Here, it's a direct definition question: "What is asthma?".
Next, evaluate each option against your foundational knowledge of respiratory diseases.
Option A describes airway narrowing (bronchoconstriction), which is the central mechanism of an asthma attack. This is a strong candidate.
Option B points to a cardiac issue. Recall that asthma is a respiratory disease, making this option unlikely.
Option C mentions surfactants. Remember that surfactant issues are primarily related to alveolar stability, especially in newborns (IRDS), not the bronchiolar inflammation of asthma.
Based on this analysis, conclude that bronchoconstriction is the most accurate and direct description of the breathing difficulty in asthma among the choices.

Concept Tested & Keywords

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E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 407-409

E6 Physiology Guyton 4SAE Part 2A p. 134-136