Idiopathic Thrombocytopenic Purpura
National Organization for Rare Disorders, Inc.
It is possible that the main title of the report Idiopathic Thrombocytopenic Purpura is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
Idiopathic thrombocytopenic purpura (ITP) is a not infrequent autoimmune bleeding disorder characterized by the abnormally low levels of blood cells called platelets, creating a condition known as thrombocytopenia. Platelets are specialized blood cells that help prevent and stop bleeding by inducing clotting. In many ITP cases, there are no readily apparent causes or underlying disease (idiopathic), but frequently there are associated collagen vascular diseases or underlying neoplasms, most frequently lymphoid. The cells of the immune system, lymphocytes, produce anti-platelet antibodies that attach to the platelets. The presence of antibodies on platelets leads to their destruction in the spleen. The disorder is characterized by abnormal bleeding into the skin resulting in bruising, which is what the term purpura means. Bleeding from mucous membranes also occurs, and may subsequently result in low levels of circulating red blood cells (anemia).
ITP presents as a brief, self-limiting form of the disorder (acute ITP) or a longer-term form (chronic ITP). Acute ITP accounts for about 50% of cases, and chronic ITP accounts for the remainder. Eighty percent (80%) of the children with ITP have the acute form while the chronic form affects mostly adults. The acute form usually resolves without treatment (spontaneously) within three to six months. When thrombocytopenia lasts for more than six to 12 months, ITP is classified as the chronic form. Onset of acute ITP is often rapid, while the onset of the chronic form may be gradual.
American Autoimmune Related Diseases Association, Inc.
22100 Gratiot Ave.
Eastpointe, MI 48021
NIH/National Heart, Lung and Blood Institute
P.O. Box 30105
Bethesda, MD 20892-0105
ITP People Place
133 Rollins Avenue, #5
Rockville, MD 20852
NIH/National Heart, Lung and Blood Institute ~ Hematology Branch
10 Center Dr, Building 10-CRC
Bethesda, MD 20892-1202
Platelet Disorder Support Association
133 Rollins Avenue, Suite 5
Rockville, MD 20852
30 Old Kings Hwy South Suite 275
Darien, CT 06820
ITP Support Association
Bedfordshire, MK44 2EW
Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg, MD 20898-8126
PO Box 241956
Los Angeles, CA 90024
Autoimmune Information Network, Inc.
PO Box 4121
Brick, NJ 08723
European Society for Immunodeficiencies
1-3 rue de Chantepoulet
Geneva, CH 1211
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Last Updated: 2/18/2011
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