Treatment Pernicious Anemia Explained for Students (Easy Guide)

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Original Question

Treatment of pernicious anemia involves lifelong vitamin B12 replacement, primarily through parenteral administration because the oral absorption pathway via intrinsic factor is impaired. Intramuscular cyanocobalamin injections replenish serum vitamin B12 levels, facilitating the resumption of normal DNA synthesis and effective erythropoiesis (Esposito et al., 2022). Early treatment reverses hematologic abnormalities, normalizing blood counts and reducing hemolysis markers, as peripheral blood reticulocytes increase when effective erythropoiesis is restored. Neurological symptoms may improve if therapy initiates promptly, though prolonged deficiency can result in irreversible damage. In this patient’s case, vitamin B12 therapy is essential to correct the macrocytic anemia, alleviate symptoms, and prevent potential neurologic decline. Specifically, the patient’s clinical presentation, including fatigue and laboratory signs of macrocytic anemia with elevated LDH and bilirubin, reflect the underlying hemolysis and ineffective erythropoiesis driven by vitamin B12 deficiency. The positive anti-intrinsic factor antibody firmly establishes the diagnosis and supports autoimmune-mediated intrinsic factor loss. Treatment with intramuscular vitamin B12 would aim to restore hematological parameters by correcting the deficiency, suppressing hemolysis, and promoting normal red blood cell maturation. Monitoring the patient’s clinical and laboratory response is critical to ensure resolution

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