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The effect of education on rCBF changes in Alzheimer’s disease: a longitudinal SPECT study

  • Haruo Hanyu
  • Tomohiko Sato
  • Soichiro Shimizu
  • Hidekazu Kanetaka
  • Toshihiko Iwamoto
  • Kiyoshi Koizumi
Original Article

Abstract

Purpose

To determine the relationship of differing levels of education on regional cerebral blood flow (rCBF) in patients with Alzheimer’s disease (AD).

Methods

Fifty-three patients with AD followed-up for an average of 36 months were divided into the high-educated group (HE, ≥12 years of schooling) and low-educated group (LE, <12 years of schooling). The cognitive and functional impairment was assessed using the Mini-Mental State Examination (MMSE) and the Functional Assessment Staging (FAST), respectively. Initial and follow-up rCBF were assessed using SPECT with N-isopropyl-p-[123I]-iodoamphetamine and the SPECT data were analyzed by 3D-stereotactic surface projections.

Results

At initial evaluation, the HE group had greater rCBF deficits in the parietotemporal regions than did the LE group, even though both groups had comparable MMSE and FAST scores. When compared with initial SPECT, follow-up SPECT showed a significant rCBF reduction in widespread regions, including the frontal, parietal, temporal, and limbic lobes of the HE group, while it a significant rCBF reduction in scattered and small regions of the parietotemporal, cingulate, and occipital areas of the LE group, as the HE group had faster cognitive and functional decline than the LE group.

Conclusion

The HE group showed lower rCBF at initial SPECT than the LE group, suggesting more advanced AD pathology. As a result, the HE group demonstrated a more extensive and severe reduction of rCBF on follow-up SPECT in association with faster cognitive and functional decline than the LE group. Our SPECT study provides stronger support for the cognitive reserve effects of education in AD.

Keywords

Alzheimer’s disease SPECT Cerebral blood flow Education Progression 

Notes

Acknowledgements

We thank K. Hirayama and H. Hirose of the Department of Nuclear Medicine of Tokyo Medical University for their support and technical assistance. We are also grateful to Professor J. Patrick Barron of the International Medical Communications Center of Tokyo Medical University for his review of the manuscript.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Haruo Hanyu
    • 1
  • Tomohiko Sato
    • 1
  • Soichiro Shimizu
    • 1
  • Hidekazu Kanetaka
    • 1
  • Toshihiko Iwamoto
    • 1
  • Kiyoshi Koizumi
    • 2
  1. 1.Department of Geriatric MedicineTokyo Medical UniversityTokyoJapan
  2. 2.Department of RadiologyTokyo Medical UniversityTokyoJapan

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