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Thrombocytopenia: Causes, Symptoms & Treatment
Thrombocytopenia is a condition characterized by an abnormally low platelet count in the blood, which can lead to increased bleeding risk and has various underlying causes.
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Thrombocytopenia is a condition characterized by an abnormally low platelet count in the blood, which can lead to increased bleeding risk and has various underlying causes.
What is Thrombocytopenia?
Thrombocytopenia is a medical condition in which the number of platelets (thrombocytes) in the blood is lower than normal. Platelets are small cell fragments that play a critical role in blood clotting. They help seal wounds and stop bleeding. A normal platelet count ranges from 150,000 to 400,000 platelets per microliter of blood. When the count falls persistently below 150,000 per microliter, the condition is diagnosed as thrombocytopenia.
Causes
The causes of thrombocytopenia can be grouped into three main categories:
Decreased Platelet Production
- Bone marrow disorders (e.g., leukemia, aplastic anemia)
- Vitamin B12 or folate deficiency
- Chemotherapy or radiation therapy
- Viral infections (e.g., HIV, Hepatitis C)
Increased Platelet Destruction
- Immune thrombocytopenia (ITP): The immune system produces antibodies that destroy the body's own platelets
- Medications (e.g., heparin, certain antibiotics)
- Thrombotic thrombocytopenic purpura (TTP)
- Disseminated intravascular coagulation (DIC)
Abnormal Platelet Distribution
- Enlarged spleen (splenomegaly): Too many platelets are sequestered in the spleen
- Liver disease
Symptoms
Symptoms depend on the severity of the platelet reduction. Common signs include:
- Petechiae (pinpoint skin hemorrhages)
- Easy bruising (hematomas)
- Prolonged bleeding from cuts or after surgery
- Bleeding gums or nosebleeds
- Blood in urine or stool
- In severe cases: intracranial bleeding (rare but life-threatening)
In mild forms (platelet counts between 50,000 and 150,000/µl), patients often have no noticeable symptoms.
Diagnosis
Thrombocytopenia is typically diagnosed through a complete blood count (CBC), which measures the number of platelets in the blood. Additional diagnostic steps may include:
- Blood smear to evaluate platelet size and morphology
- Bone marrow biopsy if a bone marrow disorder is suspected
- Testing for antiplatelet antibodies (if ITP is suspected)
- Liver function tests and coagulation panels
- Ultrasound examination of the spleen
Treatment
Treatment depends on the underlying cause and the severity of the condition:
Mild Cases
When platelet counts remain above 50,000/µl and there are no significant symptoms, treatment may not be required. Regular blood count monitoring is still recommended.
Medical Treatment
- Corticosteroids (e.g., prednisone) for immune thrombocytopenia
- Intravenous immunoglobulins (IVIG) to rapidly increase platelet counts
- Thrombopoietin receptor agonists (e.g., romiplostim, eltrombopag) to stimulate platelet production
- Discontinuation of causative medications
Further Interventions
- Platelet transfusions in severe thrombocytopenia or active bleeding
- Splenectomy (surgical removal of the spleen) in treatment-resistant ITP
- Treatment of the underlying disease (e.g., chemotherapy for leukemia)
References
- Kaushansky K. et al.: Williams Hematology, 9th Edition. McGraw-Hill Education (2016).
- Neunert C. et al.: American Society of Hematology 2019 guidelines for immune thrombocytopenia. Blood Advances, 3(23):3829-3866 (2019).
- World Health Organization (WHO): Platelet disorders and thrombocytopenia - clinical overview. WHO Press (2021).
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