Asthma-IV: Diagnostic and Management

Healthcare providers begin with a detailed medical history, asking about symptoms like wheezing, chest tightness, breathlessness, and productive cough. They also inquire about triggers such as exercise, allergens, or cold air. Physical examination focuses on the respiratory system, listening for wheezing and checking for associated conditions like allergic rhinitis. Understanding symptom frequency, duration, and intensity helps categorize asthma severity.

Spirometry measures the Forced Expiratory Volume in one second (FEV1) and Forced Vital Capacity (FVC). An FEV1/FVC ratio below 70% indicates airflow obstruction, a key asthma characteristic. Peak flow meters assess the peak expiratory flow rate, showing how quickly air is expelled from the lungs. Together, these lung function tests provide quantitative measures of airway obstruction severity.

Bronchoprovocation tests, including methacholine challenge and exercise challenge tests, are used when spirometry results are normal but asthma is still suspected. These tests assess airway hyperresponsiveness by inducing bronchoconstriction. They help confirm asthma diagnosis by demonstrating the airways' abnormal sensitivity to specific triggers or stimuli.

Long-term control medications are taken daily to maintain asthma control and prevent attacks. Inhaled corticosteroids reduce airway inflammation and sensitivity. Long-acting beta-2 adrenergic agonists relax airway muscles to improve breathing. Leukotriene modifiers inhibit compounds that trigger asthma symptoms. These medications work together to provide sustained airway protection and reduce symptom frequency.

Quick-relief medications address acute asthma symptoms and provide rapid bronchodilation. Short-acting beta-2 adrenergic agonists, anticholinergics, and anti-inflammatory drugs work quickly during asthma attacks. Unlike long-term control medications taken daily, quick-relief medications are used as needed when symptoms occur, offering immediate airway opening and symptom resolution.

Metered-dose inhalers spray medication and require coordination between actuation and inhalation. Dry powder inhalers release medication as powder, requiring quick, deep inhalation. Nebulizers convert liquid medication into mist, suitable for young children or those with severe asthma. Device selection depends on patient age, coordination, preference, and medication type. Regular technique review ensures effective medication delivery.

Blood tests measuring eosinophil counts identify eosinophilic inflammation, indicating allergic asthma. Allergy testing identifies specific triggers that may exacerbate asthma symptoms, helping patients and providers develop targeted avoidance strategies. Chest X-rays reveal signs of hyperinflation and diaphragm flattening. Together, these diagnostic tools provide comprehensive assessment of asthma type and severity.