Chronic obstructive pulmonary disease

Chronic obstructive pulmonary disease (COPD) is one of the most common lung diseases. It makes it difficult to breathe. There are two main forms of COPD:

• Chronic bronchitis, which involves a long-term cough with mucus
• Emphysema, which involves destruction of the lungs over time

Most people with COPD have a combination of both conditions.

CAUSES

Smoking is the leading cause of COPD. The more a person smokes, the more likely that person will develop COPD. However, some people smoke for years and never get COPD.

In rare cases, nonsmokers who lack a protein called alpha-1 antitrypsin can develop emphysema.

Other risk factors for COPD are:

• Exposure to certain gases or fumes in the workplace
• Exposure to heavy amounts of secondhand smoke and pollution
• Frequent use of cooking fire without proper ventilation

SYMPTOMS

• Cough, with or without mucus
• Fatigue
• Many respiratory infections
• Shortness of breath (dyspnea) that gets worse with mild activity
• Trouble catching one's breath
• Wheezing

Because the symptoms of COPD develop slowly, some people may not know that they are sick.

EXAMS AND TESTS

The best test for COPD is a lung function test called spirometry. This involves blowing out as hard as possible into a small machine that tests lung capacity. The results can be checked right away, and the test does not involve exercising, drawing blood, or exposure to radiation.

Using a stethoscope to listen to the lungs can also be helpful. However, sometimes the lungs sound normal even when COPD is present.

Pictures of the lungs (such as x-rays and CT scans) can be helpful, but sometimes look normal even when a person has COPD (especially chest x-ray).

Sometimes patients need to have a blood test (called arterial blood gas) to measure the amounts of oxygen and carbon dioxide in the blood.

TREATMENT

There is no cure for COPD. However, there are many things you can do to relieve symptoms and keep the disease from getting worse.

Persons with COPD MUST stop smoking. This is the best way to slow down the lung damage.

Medications used to treat COPD include:

• Inhalers (bronchodilators) to open the airways
• Inhaled steroids to reduce lung inflammation
• Anti-inflammatory medications are sometimes used

In severe cases or during flare-ups, you may need to receive:

• Steroids by mouth or through a vein (intravenously)
• Bronchodilators through a nebulizer
• Oxygen therapy
• Assistance during breathing from a machine

Antibiotics are prescribed during symptom flare-ups, because infections can make COPD worse.

You may need oxygen therapy at home if you have a low level of oxygen in your blood.

Pulmonary rehabilitation does not cure the lung disease, but it can teach you to breathe in a different way so you can stay active. Exercise can help maintain muscle strength in the legs.

Walk to build up strength.

• Ask the doctor how far to walk.
• Slowly increase how far you walk.
• Try not to talk when you walk if you get short of breath.
• Use pursed lip breathing when breathing out (to empty your lungs before the next breath)

Things you can do to make it easier for yourself around the home include:

• Avoiding very cold air
• Making sure no one smokes in your home
• Reducing air pollution by getting rid of fireplace smoke and other irritants

Eat a healthy diet with fish, poultry, or lean meat, as well as fruits and vegetables. If it is hard to keep your weight up, talk to a doctor or dietitian about eating foods with more calories.

OUTLOOK (PROGNOSIS)

COPD is a long-term (chronic) illness. The disease will get worse more quickly if you do not stop smoking.

Patients with severe COPD will be short of breath with most activities and will be admitted to the hospital more often.

POSSIBLE COMPLICATIONS

• Irregular heartbeat (arrhythmia)
• Need for breathing machine and oxygen therapy
• Right-sided heart failure or cor pulmonale (heart swelling and heart failure due to chronic lung disease)
• Pneumonia
• Pneumothorax
• Severe weight loss and malnutrition
• Thinning of the bones (osteoporosis)

WHEN TO CONTACT A DOCTOR

Go to the emergency room or call the local emergency number if you have a rapid increase in shortness of breath.

PREVENTION

Not smoking prevents most COPD. Ask your doctor about quit-smoking programs. Medicines are also available to help kick the smoking habit. The medicines are most effective if you are motivated to quit.