What is Asthma?

Asthma is a respiratory condition characterized by the narrowing of the airways in the lungs, leading to difficulties in breathing. The condition is believed to arise from a combination of genetic and environmental factors. While anyone can develop asthma, it is often diagnosed during childhood. During an asthma attack, individuals may experience symptoms such as shortness of breath, wheezing, and coughing. The muscles surrounding the bronchi tighten, limiting airflow to the lungs, while mucus accumulation further obstructs breathing.

Symptoms of Asthma

Common symptoms during an asthma attack include coughing, rapid shallow breaths, and a sensation of tightness in the chest and ribs. As the condition worsens, wheezing sounds and gasping for air may become evident.

Causes and Risk Factors

While the exact causes of asthma remain unclear, researchers have identified several triggers that can provoke an asthma attack. Allergies are a prominent trigger; individuals with allergies are at a higher risk of developing asthma due to immune system overreactions that cause airway inflammation. Symptoms often worsen during spring.

Viral infections, particularly those caused by influenza, can also trigger asthma symptoms similarly to allergies. Children exposed to cigarette smoke experience more frequent asthma attacks compared to their non-exposed peers. Additionally, industrial pollutants, including emissions from burning coal and vehicle exhaust, can initiate asthma episodes. Exercise and stress are significant contributors to asthma attacks; during physical activity, the influx of cold, dry air can irritate the bronchial tubes, precipitating symptoms.

How Asthma is Diagnosed

Asthma diagnosis can be performed by various healthcare professionals, including family physicians, allergists, and pulmonologists. Accurate diagnosis relies on physical examinations, patient history, and family history. Chest x-rays may be conducted to exclude pneumonia, and auscultation of lung sounds is vital for diagnosis.

In cases where accessing medical facilities during an asthma attack is challenging, alternative methods, such as the methacholine challenge test, can simulate an asthma exacerbation for diagnostic purposes. During actual or simulated attacks, lung function can be assessed through:

  • Spirometry: A standard test that measures lung function by assessing how much air is inhaled and exhaled, along with airflow speed.
  • Peak Flow Meters: Portable devices that measure how well air moves out of the lungs. Regular use helps manage asthma symptoms and prevent attacks.
  • Pulmonary Function Tests: Non-invasive tests that evaluate lung performance by measuring lung volume, capacity, flow rates, and gas exchange.

In young children under five, performing lung function tests can be difficult. Therefore, healthcare providers often rely on medical history, observed symptoms, and physical examinations for diagnosis.

Complications

If asthma is left untreated, it may lead to serious complications, including partial or total lung collapse and respiratory failure, which can be fatal.

Treatments

Asthma is a chronic condition, meaning that individuals diagnosed with it will likely manage the illness throughout their lives. Although some may experience long periods without attacks, having medications readily available is crucial. The most commonly used short-term relief medications are beta-agonists, such as albuterol, which relax bronchial muscles. Anticholinergics like ipratropium bromide (Atrovent) and tiotropium bromide (Spiriva) also provide short-term relief.

Long-term control medications are designed to be taken daily to prevent symptoms and attacks. These include inhaled corticosteroids, antileukotrienes (leukotriene modifiers), and cromolyn sodium, which are effective in reducing airway inflammation when used consistently. Additionally, avoiding allergens, irritants, and environmental triggers is essential in preventing asthma attacks.

Written By: Vanora D’Sa MD

References: Gold, Susan Dudley. (2000). Asthma. Berkeley Heights, NJ: Enslow.