Nasal polyps are commonly associated with: -

Correct Answer: B. Intrinsic asthma

Nasal polyps are strongly associated with intrinsic asthma, not extrinsic. Intrinsic asthma is characterized by non-allergic, endogenous triggers (infections, irritants, emotional stress, exercise, cold air, aspirin/NSAIDs). The pathophysiology involves abnormal airway hyperresponsiveness driven by inflammatory mediators rather than IgE-mediated mechanisms. Nasal polyps develop in 5–15% of intrinsic asthma patients, particularly those with aspirin sensitivity (Samter's triad: asthma + nasal polyps + aspirin/NSAID intolerance). This triad reflects a shared COX-1 inhibition pathway leading to leukotriene overproduction in both upper and lower airways. The polyps are typically bilateral, pale, and gelatinous—arising from chronic eosinophilic inflammation. In Indian clinical practice, intrinsic asthma with nasal polyps is often seen in middle-aged adults with recurrent sinusitis and chronic rhinosinusitis. The association is so strong that presence of nasal polyps in an asthmatic should prompt evaluation for aspirin sensitivity and consideration of leukotriene receptor antagonists (montelukast) as first-line therapy, per Indian guidelines.

Why the other options are wrong

A. Exercise-induced asthma — Exercise-induced asthma (EIA) is a form of intrinsic asthma triggered specifically by physical exertion in cold, dry air. While it shares the non-allergic phenotype, EIA is a functional airway response to exercise-induced dehydration and cooling, not a systemic inflammatory condition. Nasal polyps do not develop as a consequence of EIA alone; they require chronic upper airway eosinophilic inflammation, which is not characteristic of isolated EIA. This option conflates a trigger of intrinsic asthma with the broader intrinsic asthma phenotype. C. Extrinsic asthma — Extrinsic asthma is IgE-mediated, allergic asthma triggered by environmental allergens (pollen, dust, pet dander). The pathophysiology is acute mast cell degranulation and eosinophilic inflammation driven by specific allergen-antibody interactions. Nasal polyps in allergic rhinitis are rare and, when present, are typically small and localized. The chronic eosinophilic remodeling and leukotriene-driven inflammation characteristic of intrinsic asthma with Samter's triad does not occur in extrinsic asthma. NBE may pair this option to test whether students confuse allergic rhinitis (which can have polyps) with extrinsic asthma pathophysiology. D. Brittle asthma — Brittle asthma is a rare, severe phenotype characterized by wide peak flow variability (>40% between visits) despite high-dose inhaled corticosteroids. It reflects extreme airway lability and is often associated with psychological factors, vocal cord dysfunction, or severe eosinophilic disease. While some brittle asthma patients may have nasal polyps (if they have concurrent eosinophilic disease), nasal polyps are not a defining or characteristic feature of brittle asthma. This is a distractor that conflates severity with a specific anatomical association.

High-Yield Facts

Mnemonics

INTRINSIC = INfection, IRritants, INternal triggers Intrinsic asthma is triggered by internal (non-allergic) factors: Infections, IRritants, cold air, Aspirin, Stress, Exercise. Extrinsic = External allergens (pollen, dust, pets). Use this to remember that intrinsic asthma patients develop polyps because of chronic non-allergic inflammation, not acute allergic reactions. Samter's = Asthma + Sinusitis + Sensitivity Samter's triad: Asthma + nasal polyps/Sinusitis + Sensitivity to aspirin/NSAIDs. All three share COX-1 inhibition → leukotriene surge. When you see nasal polyps in an asthmatic, think Samter's and check aspirin tolerance.

NBE Trap

NBE may pair "exercise-induced asthma" to test whether students conflate a trigger of intrinsic asthma with the broader intrinsic asthma phenotype. Exercise-induced asthma is a functional airway response, not a systemic inflammatory condition that produces nasal polyps. The trap is semantic: both are "intrinsic," but only the broader intrinsic asthma phenotype associates with polyps.

Clinical Pearl

In Indian outpatient practice, a 45-year-old with asthma and bilateral nasal polyps should raise suspicion for Samter's triad. Ask about NSAID use and aspirin intolerance; if present, avoid all COX inhibitors and initiate leukotriene antagonists. This simple clinical correlation prevents acute asthma exacerbations and guides pharmacotherapy.

_Reference: Harrison Ch. 297 (Asthma); Robbins Ch. 15 (Respiratory Pathology); KD Tripathi Ch. 27 (Bronchodilators and Antiasthma Drugs)_