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Blood clot formation
Blood clot formation


Blood clots
Blood clots


Definition:

Acquired platelet function defects are diseases or conditions that cause the blood elements needed for blood clotting (platelets ) to not work properly. The term "acquired" means these diseases or conditions are not inherited, but instead develop independently in a person.



Alternative Names:

Acquired qualitative platelet disorders; Acquired disorders of platelet function



Causes, incidence, and risk factors:

With platelet disorders, there may be too many or too few platelets, or platelets that do not function well. Any platelet disorder affects blood clotting.

These disorders can be caused by diseases that are present at birth (congenital), or they may develop because of another disease or condition. In many cases, the platelet count may be normal or even high, but there will be evidence of a bleeding disorder.

Disorders that can cause problems in platelet function include:

Other causes include:



Symptoms:

Treatment:

Treatment is aimed at the cause of the problem.

  • Bone marrow disorders (which have abnormally high numbers of platelets) are treated with platelet transfusions or by removing platelets from the blood and replacing them with donated platelets (plateletpheresis)
  • Kidney failure is treated with dialysis or a drug called ddAVP
  • Platelet problems caused by medication are treated by stopping the medication


Support Groups:



Expectations (prognosis):

Treating the cause of the problem usually corrects the defect.



Complications:
  • Prolonged bleeding
  • Severe anemia


Calling your health care provider:

Call your health care provider:

  • If you have bleeding and do not know the cause
  • If your symptoms get worse or do not improve after you are treated for an acquired platelet function defect


Prevention:

Using medications carefully can reduce the risk of drug-related acquired platelet function defects. Treating other disorders may also reduce the risk. Some cases are not preventable.



References:

McMillan R. Hemorrhagic disorders: Abnormalities of platelet and vascular function. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier;2007:chap 179.




Review Date: 3/2/2009
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and Yi-Bin Chen, MD, Leukemia/Bone Marrow Transplant Program, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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