**Question:** Aspirin-sensitive asthma is associated with

A. Cyclooxygenase-1 inhibition
B. Cyclooxygenase-2 inhibition
C. Leukotriene synthesis
D. Anticholinergic drugs

**Core Concept:**
Asthma is a chronic respiratory condition characterized by inflammation, bronchoconstriction, and airway hyperresponsiveness. Aspirin is a nonsteroidal anti-inflammatory drug (NSAID) that inhibits the production of prostaglandins, which are lipid mediators involved in inflammation, pain, and fever. There are two main forms of cyclooxygenase (COX) enzymes: COX-1 and COX-2.

**Why the Correct Answer is Right:**
Aspirin-sensitive asthma is associated with COX-1 inhibition. When aspirin is taken, it inhibits both COX-1 and COX-2 enzymes. However, the primary effect of aspirin in asthmatic patients is on COX-1, which is essential for maintaining normal mucosal protection in the gastrointestinal tract and platelet function. Inhibition of COX-1 leads to decreased production of protective prostaglandins, resulting in increased susceptibility to respiratory infections and worsening of asthma symptoms.

**Why Each Wrong Option is Incorrect:**

A. Cyclooxygenase-2 inhibition (Option B) is not the correct answer because COX-2 inhibition alone does not lead to worsening of asthma due to the protective role of COX-1.

B. Leukotrienes are lipid mediators involved in asthma pathogenesis, particularly in the early phase of asthma. However, leukotriene synthesis (Option D) is not the correct answer because leukotrienes alone do not explain the relationship between aspirin sensitivity and asthma.

C. Anticholinergic drugs (Option C) are used to treat asthma by inhibiting the action of acetylcholine on muscarinic receptors. This option is not the correct answer as it does not explain the relationship between aspirin sensitivity and asthma.

**Clinical Pearl:**
Aspirin-sensitive asthma is a subset of asthma patients who experience worsening of asthma symptoms after taking aspirin or other NSAIDs due to the inhibition of COX-1 enzymes. This condition is also called aspirin-exacerbated respiratory disease (AERD) or Samter's triad, which includes:

1. Asthma exacerbation
2. Nasal polyps
3. Exacerbation of urticaria or angioedema

**Correct Answer Explanation:**
The correct answer is **Aspirin-sensitive asthma is associated with COX-1 inhibition because COX-1 is essential for mucosal protection of the respiratory tract and gastrointestinal tract**. Inhibition of COX-1 leads to decreased production of protective prostaglandins, increased susceptibility to respiratory infections, and exacerbation of asthma symptoms.