Asthma is a chronic, inflammatory lung disease involving recurrent breathing problems.

It's characterized by three airway problems: obstruction, inflammation, and hyper-responsiveness.

Asthma may resemble other respiratory problems such as emphysema, bronchitis, and lower respiratory infections. If asthma is not diagnosed, many people don't know they have it.

Cause

The cause of the lung abnormality in asthma isn't yet known, although health care professionals have established that it is a special type of inflammation of the airways that leads to contraction of airway muscles, mucus production, and swelling in the airways.

It's important to know that asthma is not caused by emotional factors, as was commonly believed years ago. Anxiety and nervous stress can cause fatigue, which may affect the immune system and increase asthma symptoms or aggravate an attack. However, these reactions are considered to be more of an effect than a cause.

Asthma Symptoms Include:

  • Wheezing (a whistling sound as air is forcibly expelled)
  • Difficulty breathing
  • Chest tightness
  • A persistent cough
  • A rapid pulse
  • Sweating
  • Flared nostrils and pursed lips
  • A need to sit upright
  • A bluish discoloration of the lips and fingernails (cyanosis)

What Happens During an Asthma Attack?

People with asthma have episodes when the air passages in their lungs become narrower and breathing becomes more difficult. These problems are caused by an oversensitivity of the lungs and airways, which overreact to certain triggers and become inflamed and clogged.

Breathing becomes harder and may hurt, and there may be coughing. There also may be a wheezing or whistling sound, typical of asthma. Wheezing occurs because muscles that surround the airways tighten and the inner lining of the airways swells and pushes inward. Membranes that line the airways secrete extra mucus, which can form plugs that further block the air passages. The rush of air through the narrowed airways produces the wheezing sound.

Risk Factors

Although anyone can have an asthma attack, it most commonly occurs in children and adolescents ages 5 to 17 years, adults older than 65, and people living in urban communities. Other factors include having a family history of asthma or a personal medical history of allergies.

Diagnostic Tests and Procedures

To diagnose asthma, doctors rely on a combination of your medical history, a physical exam, and lab tests, which may include:

  • Spirometry: The evaluation of lung function with a spirometer. This is one of the simplest, most common pulmonary function tests and may be necessary for the following reasons:

    • To determine how well the lungs receive, hold, and use air

    • To monitor a lung disease

    • To monitor the effectiveness of treatment

    • To determine the severity of a lung disease

    • To determine whether the lung disease is restrictive (decreased airflow) or obstructive (disruption of airflow)

  • Peak flow monitor (PFM): A device used to measure the fastest speed at which a person can blow air out of the lungs. During an asthma or other respiratory flare-up, the large airways in the lungs slowly begin to narrow. This slows the speed of air leaving the lungs and can be measured by a PFM. This measurement is very important in evaluating how well the disease is being controlled.

  • Chest X-rays

  • Blood tests

  • Allergy tests

Treatment

As of yet, there's no cure for asthma. However, it often can be controlled by taking prescription medications that may help prevent or relieve symptoms. Learning ways to manage episodes can also make a difference. People with asthma can learn to identify and avoid the things that trigger an episode, and educate themselves about medications and other asthma management strategies.

Medical Reviewer: Jenkins, Lee Last Annual Review Date: 2008-12-31T00:00:00-07:00 Copyright: © 2000-2010 The StayWell Company, 780 Township Line Road, Yardley, PA 19067. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.

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