Polycythemia vera Health Article

Definition

Polycythemia vera is an abnormal increase in the number of blood cells (primarily red blood cells) produced by the bone marrow.

Alternative Names

Primary polycythemia; Polycythemia rubra vera; Myeloproliferative disorder; Erythremia; Splenomegalic polycythemia; Vaquez's disease; Osler's disease; Polycythemia with chronic cyanosis - Myelopathic polycythemia; Erythrocytosis megalosplenica; Cryptogenic polycythemia

Causes, incidence, and risk factors

Polycythemia vera is a disorder of the bone marrow. It causes too much production of white blood cells, red blood cells, and platelets.

It is a rare disease that occurs more often in men than women, and is rare in patients under age 40. The exact cause is unknown.

Symptoms

• Breathing difficulty when lying down
• Dizziness
• Fullness in the left upper abdomen
• Headache
• Itchiness, especially after a warm bath
• Red coloring, especially of the face
• Shortness of breath
• Symptoms of phlebitis

Note: Symptoms are due to increased blood thickness and clotting.

Other symptoms that may occur with this disease:

• Bluish skin discoloration
• Fatigue
• Red skin spots
• Vision problems

Signs and tests

The health care provider will perform a physical exam. Tests that may be done include:

• Bone marrow biopsy
• Blood volume
• Chemistry panel
• Complete blood count with differential
• Erythropoietin level
• Genetic test
• Vitamin B12 level

This disease may also affect the results of the following tests:

• ESR
• Lactate dehydrogenase
• Leukocyte alkaline phosphatase
• Platelet aggregation test
• Serum uric acid

Treatment

The goal of treatment is to reduce the thickness of the blood and prevent bleeding and clotting.

A method called phlebotomy is used to decrease blood thickness. One pint of blood is removed weekly until the hematocrit level is less than 45, then therapy is continued as needed.

Occasionally, chemotherapy (specifically hydroxyurea) may be given to suppress the bone marrow. Interferon may also be given in an attempt to lower blood counts. A medicine called anegrelide may be given to lower platelet counts.

The use of blood thinners (such as aspirin) is controversial because it may cause stomach bleeding. However, it does prevent blood clots.