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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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Things worth knowing about "Thrombocytopenia"

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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