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Thrombotic thrombocytopenic purpura

TTP

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Causes

This disease may be caused by problems with an enzyme (a type of protein) that is involved in blood clotting. This enzyme is called ADAMTS13. As a result, clotting occurs in an abnormal way.

  • As the platelets clump together in these clots, fewer platelets are available in the blood in other parts of the body to help with clotting.
  • This can lead to bleeding under the skin.
  • The blood clots prevent oxygen from reaching these parts of the body.

In some cases, the disorder is passed down through families (inherited). In these cases, people are born with naturally low levels of this enzyme.

This condition also may be caused by:

  • Cancer
  • Chemotherapy
  • Hematopoietic stem cell transplantation
  • HIV infection
  • Hormone replacement therapy and estrogens
  • Medicines (including ticlopidine, clopidogrel, guinine, and cyclosporine A)

Definition

Thrombotic thrombocytopenic purpura (TTP) is a blood disorder that causes blood clots to form in small blood vessels. This leads to a low platelet count (thrombocytopenia).

Exams and Tests

Tests that may be ordered include:

Outlook (Prognosis)

Most people who undergo plasma exchange recover completely. But some people die of this disease, especially if it is not diagnosed right away. In people who do not recover, this condition can become long-term (chronic).

Possible Complications

Complications may include:

  • Kidney failure
  • Low platelet count (thrombocytopenia)
  • Low red blood cell count (caused by the premature breakdown of red blood cells)
  • Nervous system problems
  • Severe bleeding (hemorrhage)
  • Stroke

Prevention

Because the cause is unknown, there is no known way to prevent this condition.

Symptoms

Symptoms may include any of the following:

Treatment

You may have a treatment called plasma exchange. It removes your abnormal plasma and replaces it with normal plasma from a healthy donor. Plasma is the liquid part of blood that contains blood cells and platelets. Plasma exchange also replaces the missing enzyme.

The procedure is done as follows:

  • First, you have your blood drawn as if donating blood.
  • As the blood is passed through a machine that separates blood into its different parts, the abnormal plasma is removed and your blood cells are saved.
  • Your blood cells are then combined with normal plasma from a donor, and then given back to you.

This treatment is repeated daily until blood tests show improvement.

People who do not respond to this treatment or whose condition often returns may need to:

  • Have surgery to remove their spleen
  • Get medicines that suppress the immune system, such as steroids or rituximab

When to Contact a Medical Professional

Call your health care provider if you have any unexplained bleeding.

Review Date: 2/1/2017
Reviewed By: Todd Gersten, MD, Hematology/Oncology, Florida Cancer Specialists & Research Institute, Wellington, FL. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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