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Alternative names Return to top
Extrinsic factor deficiencyDefinition Return to top
Factor VII deficiency is an inherited disorder that causes abnormal blood clotting (coagulation), resulting from a deficiency of the plasma protein factor VII.Causes, incidence, and risk factors Return to top
This disorder is caused by an inherited deficiency of factor VII, an important clotting protein. Normal blood coagulation is a complex process involving as many as 20 different plasma proteins, which are known as blood coagulation factors. A series of complex chemical reactions using these factors takes place very rapidly to form an insoluble protein called fibrin that stops bleeding.
When certain coagulation factors are deficient or missing, the chain reaction does not take place normally. In this disorder, bleeding can vary from mild to severe within the same person over time. A history of bleeding may occur in infancy or childhood. Gastrointestinal and central nervous system bleeding can occur.
The risk factor is a family history of bleeding. The incidence is 1 in 500,000.
Symptoms Return to top
Signs and tests Return to top
Treatment Return to top
Bleeding episodes can be controlled with normal plasma, concentrates containing factor VII, or recombinant factor VII. During bleeding episodes, frequent treatment is needed because the life span of factor VII is short. Menstrual bleeding can be controlled by the use of oral contraceptives.Support Groups Return to top
The stress of illness can often be helped by joining a support group where members share common experiences and problems. See hemophilia - resources.Expectations (prognosis) Return to top
The probable outcome is good with proper treatment.Complications Return to top
Calling your health care provider Return to top
Go to the emergency room or call the local emergency number (such as 911) if you have severe, unexplained bleeding.Prevention Return to top
This is an inherited disorder. There is no known prevention. Update Date: 8/18/2003 Updated by: Corey Cutler, M.D., M.P.H., F.R.C.P.C, Department of Medical Oncology, Dana-Farber Cancer Institute; Instructor in Medicine, Harvard University, Boston, MA. Review provided by VeriMed Healthcare Network.
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Page last updated: 28 October 2004 |