Asthma: Pathophysiology and Treatment

Respiratory System

Asthma: Chronic Inflammatory Disease of the Airways

Asthma is a common respiratory disorder characterized by chronic inflammation of the airways, leading to episodes of airway narrowing and obstruction. This condition affects the bronchial tubes, which carry air in and out of the lungs.

• Inflammation: The bronchial tubes become inflamed, swollen, and narrowed, which restricts airflow.

• Bronchoconstriction: The smooth muscles surrounding the airways tighten, further narrowing the airways (bronchoconstriction).

• Mucus Production: Excess mucus is produced, which can block the airways and make breathing more difficult.

• Symptoms: Common symptoms include wheezing, coughing, chest tightness, and shortness of breath.

Treatment of Asthma

Asthma management focuses on reducing airway inflammation and relieving bronchoconstriction to improve airflow and prevent symptoms.

• Inflammation Control: Treated with inhaled corticosteroids to reduce airway swelling and mucus production. (More severe cases may require oral steroids.)

• Bronchoconstriction Relief: Treated with bronchodilators (e.g., albuterol) to relax airway smooth muscle and open the airways. (More severe or exercise-induced asthma may require additional medications.)

Key Terms

• Bronchoconstriction: The narrowing of the airways due to contraction of the surrounding smooth muscle.

• Corticosteroids: Anti-inflammatory medications that reduce swelling and mucus in the airways.

• Bronchodilators: Medications that relax the smooth muscles of the airways, increasing airflow.

Example

• A patient with asthma may experience shortness of breath and wheezing after exercise. Using an inhaled bronchodilator (such as albuterol) can quickly relieve these symptoms by relaxing the airway muscles.