Heparin-Induced Thrombocytopenia

(HIT; Heparin-Induced Low Blood Platelet Count)

Definition

Platelets are a special type of blood cell. They help form clots so that you do not bleed too much. Heparin is a blood-thinning medication that decreases clotting.Thrombocytopenia means low blood platelet count. Heparin-induced thrombocytopenia is low blood platelet count caused by heparin. This condition can lead to a lot of bleeding. In some cases, it can also develop into excessive blood clotting.
Clot Formation
blood clot platelet
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Causes

This type of thrombocytopenia is caused by an immune reaction to heparin.

Risk Factors

Taking heparin is a risk factor for developing this condition.

Symptoms

Symptoms of heparin-induced thrombocytopenia include:
  • Bleeding
    • Excessive bleeding from cuts
    • Bleeding from your gums or nose
    • Superficial bleeding on the skin—looks like reddish/purple spots, often on the legs
    • Blood in urine or stool
    • Heavy menstrual flow
  • Pain or swelling in the legs
  • Chest pain
  • Difficulty breathing
  • Anxiety
  • Sweating
  • Rapid, irregular heartbeat

Diagnosis

Your doctor will ask about your symptoms and medical history. A physical exam will be done.Your bodily fluids may be tested. This can be done with blood tests.Images may be taken of your bodily structures. This can be done with ultrasound.

Treatment

Talk with your doctor about the best plan for you. Treatment options include the following:
  • Stopping the use of heparin
  • Anticoagulating drugs—to reduce the risk of blood clots:
  • Vitamin K Antagonists Therapy (VKA)— if you were taking VKA, it will be stopped and you will be given Vitamin K; the VKA will be restarted when your platelet count is normal.
  • Blood transfusion —for severe bleeding, to replace lost blood

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