Myelosuppression: Causes, Symptoms and Treatment
Myelosuppression is the suppression of blood cell production in the bone marrow. It commonly occurs as a side effect of chemotherapy or radiation therapy and can lead to serious complications.
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Myelosuppression is the suppression of blood cell production in the bone marrow. It commonly occurs as a side effect of chemotherapy or radiation therapy and can lead to serious complications.
What Is Myelosuppression?
Myelosuppression refers to the suppression or inhibition of blood cell production (hematopoiesis) in the bone marrow. This results in a reduction or complete disruption in the production of red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes). The resulting decrease in these vital cells can lead to serious and potentially life-threatening health complications.
Causes
Myelosuppression can be triggered by a variety of factors:
- Chemotherapy: Cytotoxic drugs damage not only tumor cells but also the rapidly dividing stem cells in the bone marrow.
- Radiation therapy: Irradiation of bone marrow regions directly impairs blood cell production.
- Medications: Certain antibiotics, antirheumatic drugs, or immunosuppressants can negatively affect bone marrow function.
- Viral infections: Some viruses, such as the Epstein-Barr virus or Parvovirus B19, can interfere with hematopoiesis.
- Hematological disorders: Conditions such as aplastic anemia, leukemia, or myelodysplastic syndromes directly affect the bone marrow.
- Autoimmune diseases: In some cases, the immune system attacks its own bone marrow cells, leading to suppressed blood production.
Symptoms
The symptoms of myelosuppression depend on which blood cells are affected:
Deficiency of Red Blood Cells (Anemia)
- Fatigue and exhaustion
- Paleness of the skin
- Shortness of breath
- Dizziness
Deficiency of White Blood Cells (Neutropenia / Leukopenia)
- Increased susceptibility to infections
- Recurrent or severe infections
- Unexplained fever
Deficiency of Platelets (Thrombocytopenia)
- Increased tendency to bleed
- Unexplained bruising (hematomas)
- Petechiae (small pinpoint bleedings under the skin)
- Prolonged bleeding from minor injuries
Diagnosis
Myelosuppression is primarily diagnosed through blood tests:
- Complete blood count (CBC): Measures the number and composition of all blood cells.
- Differential blood count: Detailed analysis of the different types of white blood cells.
- Bone marrow aspiration or biopsy: If results are unclear, a tissue sample from the bone marrow may be taken to determine the underlying cause.
- Reticulocyte count: Measurement of immature red blood cells to evaluate bone marrow activity.
Treatment
Treatment depends on the underlying cause and the severity of the myelosuppression:
Supportive Therapy
- Blood transfusions: Red blood cell concentrates can be given in cases of severe anemia.
- Platelet transfusions: Administered when platelet counts are critically low to prevent bleeding.
- Growth factors: G-CSF (granulocyte colony-stimulating factor) or erythropoietin can stimulate bone marrow to increase blood cell production.
Treating the Underlying Cause
- Adjusting or temporarily stopping the triggering chemotherapy or medication.
- Antibiotic therapy for infections resulting from neutropenia (febrile neutropenia).
- Immunosuppressive therapy for autoimmune-related myelosuppression.
- Stem cell transplantation in cases of severe or permanent bone marrow damage.
Infection Prevention
Patients with severely weakened immune systems should follow strict hygiene measures and may require prophylactic antibiotics or antifungal medications to reduce the risk of serious infections.
References
- Kaushansky K. et al. (eds.): Williams Hematology, 9th edition. McGraw-Hill Education, 2016.
- National Cancer Institute (NCI): Common Terminology Criteria for Adverse Events (CTCAE), Version 5.0 (2017). U.S. Department of Health and Human Services.
- Lyman G.H. et al.: Myeloid Growth Factors -- Clinical Practice Guidelines in Oncology. Journal of the National Comprehensive Cancer Network (JNCCN), 2015.
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