**Question:** Consider the following statements - During an acute attack of asthma:

A. Bronchoconstriction occurs
B. Airway hyperresponsiveness is aggravated
C. Alveolar hypoventilation occurs
D. Airway hyperresponsiveness is reduced

**Core Concept:** Asthma is a chronic respiratory disease characterized by airway inflammation, bronchoconstriction, and airway hyperresponsiveness. In an acute attack of asthma, these processes are exacerbated, leading to respiratory distress.

**Why the Correct Answer is Right:** In an acute asthma attack, bronchoconstriction (narrowing of airways) leads to reduced airflow and increased airway resistance. This is primarily due to smooth muscle contraction and increased mucus secretion, both of which contribute to bronchoconstriction.

**Why Each Wrong Option is Incorrect:**

A. **Bronchoconstriction occurs**: This is the correct explanation for the symptoms experienced in an acute asthma attack.

B. **Airway hyperresponsiveness is reduced**: In contrast to the situation during an acute attack, in asthma, hyperresponsiveness refers to the increased sensitivity of airways to various stimuli. During an acute attack, this exacerbation is not present.

C. **Alveolar hypoventilation occurs**: While asthma can lead to hypoventilation due to respiratory muscle fatigue, this is not the primary explanation for the symptoms observed during an acute attack.

D. **Airway hyperresponsiveness is increased**: In contrast to the situation during an acute attack, in asthma, hyperresponsiveness refers to the increased sensitivity of airways to various stimuli. During an acute attack, this exacerbation is not present.

**Clinical Pearl:** Understanding the mechanisms behind asthma exacerbations is crucial for optimal patient management. In an acute asthma attack, focus on bronchodilator therapy to reverse bronchoconstriction. In chronic asthma management, targeted therapy is essential to address airway hyperresponsiveness and inflammation.

**Correct Answer:** D. During an acute asthma attack, the primary mechanism is **bronchoconstriction** due to inflammation, smooth muscle contraction, and increased mucus secretion. This leads to reduced airflow and increased airway resistance, resulting in the typical symptoms of an acute asthma attack.