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Acceleration of hippocampal atrophy in a non-demented elderly population: the SNAC-K study

Published online by Cambridge University Press:  04 December 2009

Yi Zhang ,
Chengxuan Qiu ,
Olof Lindberg ,
Lena Bronge ,
Peter Aspelin ,
Lars Bäckman ,
Laura Fratiglioni  and
Lars-Olof Wahlund
Yi Zhang*
Affiliation:
Department of Clinical Science, Intervention and Technology, Division of Radiology, Karolinska Institutet, Stockholm, Sweden
Chengxuan Qiu
Affiliation:
Department of Neurobiology, Care Sciences and Society, Division of Aging Research Center, Karolinska Institutet, Stockholm, Sweden
Olof Lindberg
Affiliation:
Department of Neurobiology, Care Sciences and Society, Division of Clinical Geriatric, Karolinska Institutet, Huddinge, Stockholm, Sweden
Lena Bronge
Affiliation:
Department of Clinical Science, Intervention and Technology, Division of Radiology, Karolinska Institutet, Stockholm, Sweden Department of MRI in Sabbatsberg, Aleris Diagnostics, Stockholm, Sweden
Peter Aspelin
Affiliation:
Department of Clinical Science, Intervention and Technology, Division of Radiology, Karolinska Institutet, Stockholm, Sweden
Lars Bäckman
Affiliation:
Department of Neurobiology, Care Sciences and Society, Division of Aging Research Center, Karolinska Institutet, Stockholm, Sweden
Laura Fratiglioni
Affiliation:
Department of Neurobiology, Care Sciences and Society, Division of Aging Research Center, Karolinska Institutet, Stockholm, Sweden
Lars-Olof Wahlund
Affiliation:
Department of Neurobiology, Care Sciences and Society, Division of Clinical Geriatric, Karolinska Institutet, Huddinge, Stockholm, Sweden
*
Correspondence should be addressed to: Yi Zhang, Department of NVS, NOVUM, Plan 5, Stockholm, Sweden. Phone: +46 8 585 86193; Fax: +46 8 585 85470. Email: yi.zhang@ki.se.
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Abstract

Background: Brain atrophy in Alzheimer's disease (AD) includes not only AD-specific brain atrophy but also the atrophy induced by normal aging. Atrophy of the hippocampus has been one diagnostic marker of AD, but it was also found to emerge in healthy adults, along with increasing age. It was reported that the important age when age-related shrinkage of the hippocampus starts was around the mid-40s. The aim is to study the aging atrophy speed and acceleration of brain atrophy in a cross-sectional database, to identify the age at which acceleration of hippocampal atrophy starts in non-demented elderly persons.

Methods: 544 subjects (aged 60–97 years; 318 female and 226 male) were recruited into the MRI study by using a subsample of an epidemiological sample of 3363 healthy non-demented elderly people (over 60 years of age). Hippocampus and ventricle sizes were measured.

Results: The normalized volumes (by intracranial volume, ICV) of the hippocampus in males were smaller than those in females. The right hippocampus was larger than the left. The expansion of the lateral ventricles (2.80% per year in males, 2.95% in females) and third ventricle (1.58% and 2.28%, respectively) was more marked than the hippocampal shrinkage (0.68% and 0.79%, respectively). The suggested age at which acceleration of hippocampal atrophy starts is 72 years.

Conclusions: Males present smaller hippocampus volumes (normalized by ICV) than females; however, females are more vulnerable to hippocampal atrophy in a non-demented elderly population. An acceleration of hippocampal atrophy may emerge and start around 72 years of age in a non-demented elderly population.

Keywords

brain atrophyhippocampusMRIpopulation-based
Type
2009 IPA JUNIOR RESEARCH AWARDS – SECOND-PRIZE WINNER
Information
International Psychogeriatrics , Volume 22 , Issue 1 , February 2010 , pp. 14 - 25
Copyright
Copyright © International Psychogeriatric Association 2009

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