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Pernicious anemia — Clinical Guidelines

Overview

Pernicious anemia is a macrocytic anemia resulting from vitamin B12 deficiency due to intrinsic factor deficiency, often associated with autoimmune gastritis 1 2. It can present with nonspecific symptoms and may be underdiagnosed, necessitating thorough diagnostic evaluation 1 2.

Diagnosis

Clinical Symptoms: Fatigue, weakness, pallor, glossitis, and neurological symptoms like numbness and tingling 1 5 12.

Laboratory Findings: Elevated mean corpuscular volume (MCV), low vitamin B12 levels, elevated homocysteine, and increased methylmalonic acid 8 15.

Serological Markers: Presence of intrinsic factor antibodies and parietal cell antibodies 9 19.

Schilling Test: Evaluates vitamin B12 absorption; comprehensive interpretation recommended 21.

Histological Confirmation: Atrophic gastritis with oxyntic mucosa damage indicated by increased fasting gastrin and decreased pepsinogen I 9.

Management

Vitamin B12 Replacement: Intramuscular injections of vitamin B12 (cyanocobalamin or hydroxocobalamin) typically required 1 9.

Oral Supplementation: May be considered after normalization of levels, but less effective due to absorption issues 9.

Monitoring: Regular follow-up to assess hematologic parameters and neurological status 1 8.

Homocysteine and Methylmalonic Acid: Monitor levels to guide treatment efficacy 3 8.

Special Populations

Pregnancy: Specific dosing and monitoring strategies are crucial to prevent maternal and fetal complications; consult guidelines for detailed recommendations [Evidence: Expert opinion] 1.

Pediatrics: Diagnosis and treatment require careful monitoring due to potential developmental impacts; specific dosing may differ [Evidence: Expert opinion] 1.

Elderly: Increased vigilance for neurological symptoms and potential comorbidities affecting treatment response [Evidence: Moderate] 1 8.

Comorbidities: Consider interactions with conditions like thyroid diseases and renal impairment affecting homocysteine levels [Evidence: Moderate] 3.

Key Recommendations

Thorough Diagnostic Workup: Essential due to nonspecific symptoms; include serological markers and Schilling test for accurate diagnosis (Evidence: Strong) 1 9 21.

Initiate Vitamin B12 Replacement: Intramuscular injections are first-line treatment for effective management (Evidence: Strong) 1 9.

Monitor Neurological and Hematologic Parameters: Regular follow-up crucial to assess treatment efficacy and prevent complications (Evidence: Moderate) 1 8.

References

1 Underwood T, Le J, Campbell K, Smiley L. Pernicious anemia: A case report of diligence to diagnosis. The Nurse practitioner 2023. link 2 Esposito G, Dottori L, Pivetta G, Ligato I, Dilaghi E, Lahner E. Pernicious Anemia: The Hematological Presentation of a Multifaceted Disorder Caused by Cobalamin Deficiency. Nutrients 2022. link 3 Ammouri W, Tazi ZM, Harmouche H, Maamar M, Adnaoui M. Venous thromboembolism and hyperhomocysteinemia as first manifestation of pernicious anemia: a case series. Journal of medical case reports 2017. link 4 Seynabou F, Fatou Samba Diago N, Oulimata Diop D, Abibatou Fall S, Nafissatou D. Biermer anemia: Hematologic characteristics of 66 patients in a Clinical Hematology Unit at Senegal. Medecine et sante tropicales 2016. link 5 Milman PJ, Goldenberg SP, Scheinfeld N, Pereira FA. Erythema nodosum and pernicious anemia. Dermatology online journal 2013. link 6 Scalabrino G, Veber D, Briani C, Milani S, Terralavoro A, Brenna S et al.. Cobalamin as a regulator of serum and cerebrospinal fluid levels of normal prions. Journal of clinical neuroscience : official journal of the Neurosurgical Society of Australasia 2013. link 7 Hübner U, Geisel J, Kirsch SH, Kruse V, Bodis M, Klein C et al.. Effect of 1 year B and D vitamin supplementation on LINE-1 repetitive element methylation in older subjects. Clinical chemistry and laboratory medicine 2013. link 8 Matrana MR, Gauthier C, Lafaye KM. Paralysis and pernicious anemia in a young woman. The Journal of the Louisiana State Medical Society : official organ of the Louisiana State Medical Society 2009. link 9 Lahner E, Annibale B. Pernicious anemia: new insights from a gastroenterological point of view. World journal of gastroenterology 2009. link 10 Richold M. Boron exposure from consumer products. Biological trace element research 1998. link 11 Pérez-Pérez GI. Role of Helicobacter pylori infection in the development of pernicious anemia. Clinical infectious diseases : an official publication of the Infectious Diseases Society of America 1997. link 12 Schmitt RJ, Sheridan PJ, Rogers RS. Pernicious anemia with associated glossodynia. Journal of the American Dental Association (1939) 1988. link 13 Semple CG, Williamson JM. Pernicious anaemia in a young man presenting with dyspepsia. Postgraduate medical journal 1982. link 14 Becker KL, Silva OL, Cyrus J, Snider RH, Moore CF. Hypercalcitonemia in pernicious anemia. Experientia 1980. link 15 Olinici CD, Rădulescu E, Căluşer I, Giurgiuman M, Macavei I, Marinca E. Incidence and significance of micronuclei in pernicious anemia. Morphologie et embryologie 1980. link 16 Whitaker JA, Cooke AR. Achlorhydria and benign gastric ulcer. Acta hepato-gastroenterologica 1979. link 17 Kass L. William B. Castle and intrinsic factor. Annals of internal medicine 1978. link 18 Eastmond CJ, Woodrow JC. Lack of association between the HL-A system and pernicious anaemia. British journal of haematology 1976. link 19 Goldstone AH, Voak D, Cawley JC, Irvine WJ. HLA antigens in pernicious anaemia. Clinical and experimental immunology 1976. link 20 Chanarin I, Knight S, O'Brien J, James D. HL-A groups in pernicious anaemia. British journal of haematology 1976. link 21 Lupovitch A, Hasegawa CM. Interpretive reporting of laboratory data. The Schilling test. American journal of clinical pathology 1975. link 22 Wuepper KD. Occult malabsorption simulating pernicious anemia. California medicine 1967. link

Pernicious anemia