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Pulmonary alveolar proteinosis
Definition
Pulmonary alveolar proteinosis is a rare disease in which a type of protein builds up in the air sacs (alveoli) of the lungs, making breathing difficult.
Alternative Names
Alveolar proteinosis
Causes, incidence, and risk factors
In some cases, the cause of pulmonary alveolar proteinosis is unknown. In others, it is associated with infection or an immune problem. It also can occur with cancers of the blood system, and after exposure to high levels of dust.
This rare disorder generally affects people 30 - 50 years old and is seen in men more often than in women. A form of the disorder is present at birth (congenital).
Symptoms
There may be no symptoms.
Signs and tests
The doctor may hear crackles in the lungs. Often, the physical examination is normal.
The following tests may be done:
- Chest x-ray
- Arterial blood gases test
- Pulmonary function tests
- High-resolution CT scan of the chest
- Bronchoscopy with saline wash of the lungs (lavage)
Treatment
Treatment consists of periodically washing out the protein substance from the lung (whole-lung lavage). A lung transplant may be recommended for certain patients with this disease.
Recently, experimental data have showed some improvement with treatment using a blood-stimulating medication, which is known to be deficient in some patients who develop alveolar proteinosis.
Support Groups
Expectations (prognosis)
Some people with this condition go into remission. Others develop worsening respiratory failure.
Complications
Calling your health care provider
Call your health care provider if you develop symptoms. Progressively worsening shortness of breath may signal that your condition is developing into a more serious medical emergency.
Prevention
References
Mason RJ, Broaddus VC, Murray JF, Nadel, JA. Murray and Nadel's Textbook of Respiratory Medicine. 4th ed. Philadelphia, Pa: WB Saunders; 2005.
Levine SM. Alveolar filling disorders. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier;2007:chap 91.
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