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Concept
Hypogammaglobulinemia
Résumé
Hypogammaglobulinemia is a problem with the immune system in which not enough gamma globulins are produced in the blood (thus hypo- + gamma + globulin + -emia). This results in a lower antibody count, which impairs the immune system, increasing risk of infection. Hypogammaglobulinemia may result from a variety of primary genetic immune system defects, such as common variable immunodeficiency, or it may be caused by secondary effects such as medication, blood cancer, or poor nutrition, or loss of gamma globulins in urine, as in nonselective glomerular proteinuria. Patients with hypogammaglobulinemia have reduced immune function; important considerations include avoiding use of live vaccines, and take precautionary measures when traveling to regions with endemic disease or poor sanitation such as receiving immunizations, taking antibiotics abroad, drinking only safe or boiled water, arranging appropriate medical cover in advance of travel, and ensuring continuation of any immunoglobulin infusions needed.
The following lists types of "agammaglobulinemia" catalogued in the OMIM. Hypogammaglobulinemia can have other types; see sections "Causes" and "Etymology" below.
The presenting feature of hypogammaglobulinemia is usually a clinical history of recurrent, chronic, or atypical infections. These infections include but are not limited to: bronchitis, ear infections, meningitis, pneumonia, sinus infections, and skin infections. Such infections can potentially damage organs, leading to severe complications. Other symptoms of hypogammaglobulinemia include chronic diarrhea and complications from receiving live vaccines. Certain symptoms of chronic damage may be related to recurrent infection. For example, shortness of breath, chronic cough, and sputum production may indicate the presence of bronchiectasis. Sinus pain, nasal discharge, and postnasal drip may indicate the presence of chronic sinusitis. Diarrhea and steatorrhea may indicate malabsorption.
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