Journal of Neurology

, Volume 254, Issue 12, pp 1698–1707

Cerebral perfusion correlates of conversion to Alzheimer's disease in amnestic mild cognitive impairment

  • A. Caroli
  • C. Testa
  • C. Geroldi
  • F. Nobili
  • L. R. Barnden
  • U. P. Guerra
  • M. Bonetti
  • G. B. Frisoni
ORIGINAL COMMUNICATION

Abstract

Objective

Aim of this study was to find cerebral perfusion correlates of conversion to dementia in patients with amnestic MCI.

Methods

17 healthy subjects (age = 69 ± 3, 9 females), and 23 amnestic MCI patients (age = 70 ± 6, 10 females) underwent brain MR scan and 99mTc ECD SPECT. Conversion to AD was ascertained on average 19 ± 10 months after baseline: 9 had converted (age = 69 ± 3, 4 females), and 14 had not (age = 71 ± 8, 6 females). We processed SPECT images with SPM2 following an optimized protocol and performed a voxel-based statistical analysis comparing amnestic MCI patients converted to AD and non-converted to dementia vs controls. We assessed the effect of gray matter atrophy on the above results with SPM2 using an optimized Voxel-Based Morphometry (VBM) protocol.We compared significant hypoperfusion with significant atrophy on a voxel-byvoxel basis.

Results

In comparison with normal controls, amnestic MCI patients who converted to AD showed hypoperfusion in the right parahippocampal gyrus and left inferior temporal and fusiform gyri,whereas those who did not convert showed hypoperfusion in the retrosplenial cortex, precuneus and occipital gyri, mainly on the left side.We found no overlap between significant atrophy and significant hypoperfusion regions.

Conclusions

Parahippocampal and inferior temporal hypoperfusion in amnestic MCI patients appears as a correlate of conversion to AD; hypoperfusion in the retrosplenial cortex is involved in memory impairment but does not seem the key prognostic indicator of conversion to dementia.

Key words

mild cognitive impairment  conversion SPECT SPET 

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Copyright information

© Steinkopff Verlag 2007

Authors and Affiliations

  • A. Caroli
    • 1
  • C. Testa
    • 1
    • 2
  • C. Geroldi
    • 1
    • 3
  • F. Nobili
    • 4
  • L. R. Barnden
    • 5
  • U. P. Guerra
    • 6
  • M. Bonetti
    • 7
  • G. B. Frisoni
    • 1
    • 3
    • 8
  1. 1.Laboratory of Epidemiology, Neuroimaging and TelemedicineIRCCS San Giovanni di Dio-FBFBresciaItaly
  2. 2.Machine Vision Laboratory, Dept. of Mathematics and Computer ScienceUniversity of UdineUdineItaly
  3. 3.Psychogeriatrics Unit – IRCCS S. Giovannidi Dio-FBFBresciaItaly
  4. 4.Division of Clinical Neurophysiology, Dept. of Endocrinological and Metabolic SciencesUniversity of GenoaItaly
  5. 5.Dept. of Nuclear MedicineThe Queen Elizabeth HospitalAdelaideSouth Australia
  6. 6.Dept. of Nuclear MedicineOspedali riunitiBergamoItaly
  7. 7.Neuroradiology ServiceClinical Institute Città di BresciaBresciaItaly
  8. 8.AFaR Associazione Fatebenefratelli per la RicercaRomeItaly

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