Hypersensitivity Pneumonitis. Good find by a friend!

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This item from American Lung Association site has been forwarded to you by

Jeanine.

Hi Sharon, though you might find this interesting.

Source:

_http://www.lungusa.org/site/pp.aspx?c=dvLUK9O0E & b=849121_

(http://www.lungusa.org/site/pp.aspx?c=dvLUK9O0E & b=849121)

**If you are unable to view the HTML content below, refer to the URL

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_June 2005

* What Is Hypersensitivity Pneumonitis?_

(mip://07124f38/default.html#whatis)

* _What Are The Symptoms?_ (mip://07124f38/default.html#symptoms)

* _Who Gets Hypersensitivity Pneumonitis?_

(mip://07124f38/default.html#who)

* _What Causes Hypersensitivity Pneumonitis?_

(mip://07124f38/default.html#cause)

* _How Is Hypersensitivity Pneumonitis Diagnosed?_

(mip://07124f38/default.html#diagnose)

* _Is Hypersensitivity Pneumonitis Preventable?_

(mip://07124f38/default.html#prevent)

* _What Can Be Done To Treat Hypersensitivity Penumonitis?_

(mip://07124f38/default.html#treat)

* _Does Smoking Affect Hypersensitivity Pneumonitis?_

(mip://07124f38/default.html#smoking)

WHAT IS HYPERSENSITIVITY PNEUMONITIS?

Hypersensitivity pneumonitis (also called allergic alveolitis) is a disease

in which the air sacs (alveoli) of the lungs become inflamed when certain

dusts are inhaled to which the person is sensitized or allergic.

These dusts contain organic substances, such as fungus spores from moldy hay

or the droppings of birds.

When a person inhales such dusts the first time, no problem is noticed. But,

after repeated exposure to the dust some people may develop symptoms. The

tiny air sacs in the lung known as alveoli become inflamed, their walls fill

with white blood cells, and sometimes the sacs fill with fluid. If the disease

recurs as a result of continued or repeated exposure to the offending dusts,

parts of the lung may develop fibrous scar tissue and can no longer function

normally in breathing.

WHAT ARE THE SYMPTOMS?

The symptoms of an acute attack are similar to those of the flu and appear

some 4-6 hours after the person breathes the offending dust. These symptoms

include chills, fever, dry cough, shortness of breath, a tight feeling in the

chest, and tiredness. The symptoms may persist for as little as 12 hours or as

long as 10 days. Between attacks the person may have no symptoms and feel

quite normal.

After repeated exposure to the dust, chronic cough may develop with

excessive sputum production containing pus, and eventually there may be chronic

shortness of breath. The person may also show loss of appetite and weight loss.

WHO GETS HYPERSENSITIVITY PNEUMONITIS?

Hypersensitivity pneumonitis occurs most often in people exposed to certain

organic dusts in their daily work or living, especially dusts which contain

fungus spores from mold.

Only a small proportion of people who are exposed, perhaps 5 to 20 percent,

develop the disease. When there is frequent exposure to high concentrations

of the offending substances, the likelihood of developing hypersensitivity

pneumonitis is greatest.

WHAT CAUSES HYPERSENSITIVITY PNEUMONITIS?

The disease is caused by organic material that is inhaled as a fine dust.

Sensitization (allergy) develops over a period of several months to a number of

years.

Farmer’s lung is the best-known example. It is caused by an organism that

grows on hay, straw, or grains, and by other organic materials found on farms.

Also known to cause hypersensitivity pneumonitis are dusts from moldy sugar

cane and barley, maple bark, cork, animal hair, bird feathers and droppings,

mushroom compost, coffee beans, and paprika. Often the disease is named for

the occupations: for example mushroom-worker’s lung or paprika-splitter’s

lung. The organism of farmer’s lung also grows in the water of both

commercial

and home humidification systems, particularly if they are not adequately

maintained.

HOW IS HYPERSENSITIVITY PNEUMONITIS DIAGNOSED?

A careful, detailed history is necessary so that the occurrence of symptoms

can be related to environmental exposure. Laboratory tests of the patient’s

blood and identification of specific molds from material at the workplace may

help. Chest X-ray films and lung function tests may show effects of the

disease during acute episodes or in the chronic stage of the disease – but

they

may be normal between episodes when the patient is without symptoms. Also chest

X-ray and pulmonary function test results are not specific for

hypersensitivity pneumonitis, and positive results may be due to other causes.

Inhalation

of the materials to which the person is sensitive (challenge test) may be

necessary to confirm the diagnosis. The challenge test should be done only

under the expert medical supervision of a specialist. Sometimes, a lung biopsy

is needed to distinguish it from other lung diseases.

IS HYPERSENSITIVITY PNEUMONITIS PREVENTABLE?

Properly dried and stored farm products are unlikely to cause

hypersensitivity pneumonitis because the particular organism causing farmer’s

lung grows

only in moist conditions. Other approaches to prevention are to reduce exposure

by proper ventilation and the use of respiratory protection (masks).

If a worker begins to have symptoms of hypersensitivity pneumonitis due to

occupational exposure, the process can be stopped if it is identified early

enough. Permanent lung damage is prevented by eliminating the exposure. If

control measures do not work or are not feasible, it may be necessary to change

jobs, even though doing so may be difficult for many reasons. Therefore the

medical necessity for a change should be determined only after careful

evaluation to establish the diagnosis and specific cause.

WHAT CAN BE DONE TO TREAT HYPERSENSITIVITY PENUMONITIS?

Avoidance of the offending dust is the single most important measure because

in the early stages the disease is completely reversible.

Most drugs are of limited value in treatment; antihistamines and

bronchodilators are ineffective. Steroids can relieve the symptoms of acute

attacks but

do not cure the disease. Recovery from acute attacks may take as long as

three weeks. Residual lung damage in the form of _pulmonary fibrosis_

(http://www.lungusa.org/site/pp.asp?c=dvLUK9O0E & b=35436) is permanent and may

occur

even after symptoms have disappeared. Avoiding exposure in the first place

eliminates any possibility of later permanent damage.

DOES SMOKING AFFECT HYPERSENSITIVITY PNEUMONITIS?

There is no evidence that cigarette smoking helps cause hypersensitivity

pneumonitis. It may, however, aggravate the symptoms of a person who has the

disease. And smokers are likely to get complicating lung diseases, such as

emphysema, chronic bronchitis, or lung cancer.