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[Vitamin B12 deficiency in geriatrics]
I Bopp-Kistler1, B Rüegger-Frey, D Grob
1Klinik für Geriatrie und Rehabilitation, Stadtspital Waid, Zürich. irene.bopp@waid.stzh.ch
Praxis
|December 10, 1999
Summary
Serum vitamin B12 deficiency is common in older adults and often missed by standard tests. Measuring metabolites like homocysteine is recommended for accurate diagnosis and timely intervention to prevent cognitive decline.
Area of Science:
- Geriatric Medicine
- Nutritional Science
- Neurology
Context:
- Cobalamin (vitamin B12) deficiency prevalence increases with age.
- Standard serum vitamin B12 measurements may not accurately reflect metabolic status in the elderly.
- Atrophic gastritis is a common cause of malabsorption in this population.
Purpose:
- To highlight the limitations of current serum vitamin B12 testing in the elderly.
- To recommend alternative diagnostic methods for cobalamin deficiency.
- To emphasize the importance of early detection and intervention for neuropsychiatric symptoms.
Summary:
- Many elderly individuals with normal serum vitamin B12 levels are metabolically deficient.
- Measuring homocysteine and methylmalonic acid is advised for accurate diagnosis.
- Atypical symptoms, including cognitive impairment and dementia, are common, often without typical hematological changes.
Impact:
- Advocates for raising the diagnostic cut-off for serum cobalamin concentration.
- Stresses the narrow therapeutic window for effective intervention, potentially as short as one year.
- Recommends a liberal approach to cobalamin therapy in the elderly to prevent irreversible neurological damage.