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Anemia: Microcytic Anemia
1University of Kansas Medical Center - Department of Family Medicine and Community Health, 3901 Rainbow Blvd Mailstop 4010, Kansas City, Kansas 66160.
Abstract:
Microcytic anemia is defined as anemia with a mean corpuscular volume (MCV) of less than 80 mcm3 in adults. Age-specific parameters should be used for patients younger than 17 years. The cause of microcytic anemia includes acquired and congenital causes, which should be considered separately according to the age of the patient, risk factors, and coexisting signs and symptoms. The most common cause of microcytic anemia is iron deficiency anemia; it can be managed with oral or intravenous iron, depending on the severity and comorbid conditions of the affected individual. Pregnant patients and patients with heart failure with iron deficiency anemia require special considerations to prevent significant morbidity and mortality. The wide spectrum of thalassemia blood disorders should be considered in patients with a particularly low MCV in the absence of systemic iron deficiency. Iron chelation may be required for some of these patients. Sickle cell anemia and sideroblastic anemia are important inherited causes of microcytic (as well as normocytic) anemia. Promising treatments are being developed for patients with transfusion-dependent thalassemia and sickle cell anemia.
Insights
Microcytic anemia, characterized by low mean corpuscular volume (MCV), stems from various causes like iron deficiency or inherited blood disorders. Prompt diagnosis and tailored treatments, including iron therapy or specialized interventions, are crucial for effective management.
Area of Science:
- Hematology
- Internal Medicine
Background:
- Microcytic anemia is defined by a mean corpuscular volume (MCV) below 80 mcm3 in adults, with age-specific criteria for those under 17.
- Causes are categorized as acquired or congenital, necessitating evaluation based on patient age, risk factors, and clinical presentation.
Purpose of the Study:
- To outline the diagnostic considerations and management strategies for microcytic anemia.
- To differentiate common causes such as iron deficiency anemia from less common inherited disorders.
Main Methods:
- Review of established definitions and classifications of microcytic anemia.
- Discussion of diagnostic approaches considering patient demographics and clinical context.
- Overview of therapeutic options for different etiologies.
Main Results:
- Iron deficiency anemia is the most prevalent cause, treatable with oral or intravenous iron, with specific considerations for pregnant individuals and those with heart failure.
- Thalassemia disorders present with very low MCV and may require iron chelation.
- Inherited conditions like sickle cell anemia and sideroblastic anemia are also significant causes.
Conclusions:
- Effective management of microcytic anemia requires accurate etiological diagnosis.
- Emerging treatments offer new hope for patients with transfusion-dependent thalassemia and sickle cell anemia.
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