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Clinical Chemistry and Laboratory Medicine (CCLM)

Published in Association with the European Federation of Clinical Chemistry and Laboratory Medicine (EFLM)

Editor-in-Chief: Plebani, Mario

Ed. by Gillery, Philippe / Lackner, Karl J. / Lippi, Giuseppe / Melichar, Bohuslav / Payne, Deborah A. / Schlattmann, Peter / Tate, Jillian R.


IMPACT FACTOR increased in 2015: 3.017
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1437-4331
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Homocysteine and B vitamins in mild cognitive impairment and dementia

Pierluigi Quadri1 / Claudia Fragiacomo2 / Rita Pezzati3 / Enrica Zanda4 / Mauro Tettamanti5 / Ugo Lucca6

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Corresponding author: Ugo Lucca, Laboratory of Geriatric Neuropsychiatry, Istituto di Ricerche Farmacologiche “Mario Negri”, Via Eritrea 62, 20157 Milan, Italy Phone: +39-02-3901-4427, Fax: +39-02-3900-1916,

Citation Information: Clinical Chemical Laboratory Medicine. Volume 43, Issue 10, Pages 1096–1100, ISSN (Online) 1437-4331, ISSN (Print) 1434-6621, DOI: 10.1515/CCLM.2005.191, October 2005

Abstract

Elderly subjects with mild cognitive impairment have a high risk for conversion to Alzheimer's disease or are already in a preclinical dementia stage. By cross-sectionally comparing subjects in prodromal and early phases of dementia with non-demented controls, we tested the hypothesis whether low serum vitamin B12 and folate and high plasma total homocysteine concentrations precede or are a consequence of dementia onset. From a large population of 623 consecutive subjects seen at the Memory Clinic (Ospedale Beata Vergine, Mendrisio, Switzerland), 433 subjects could be included in the analyses: 79 elderly controls, 218 Clinical Dementia Rating 0.5 subjects, and 136 demented patients (111 with Alzheimer's disease and 25 with vascular dementia). As in an earlier report on a smaller sample of the same population (n=228), the lowest folate tertile was strongly associated with mild cognitive impairment (adjusted OR=3.1) and Alzheimer's disease (adjusted OR=4.0). Hyperhomocysteinemia showed a significant association not only with Alzheimer's disease (adjusted OR=3.1) but, at variance with the previous report, also with mild cognitive impairment (adjusted OR=2.6). Present reanalysis results suggest that subclinical folate deficiency and hyperhomocysteinemia might predate dementia onset, findings to be confirmed by longitudinal studies.

Keywords: Alzheimer's disease; dementia; folate; homocysteine; mild cognitive impairment; vitamin B12

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