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Related Experiment Videos

Association between medial temporal lobe atrophy on CT and parietotemporal uptake decrease on SPECT in Alzheimer's

I Lavenu1, F Pasquier, F Lebert

  • 1Memory Clinic, Department of Neurology, University Hospital of Lille, France.

Journal of Neurology, Neurosurgery, and Psychiatry
|October 29, 1997
PubMed
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This study combined CT scans showing medial temporal lobe atrophy and SPECT scans indicating reduced temporoparietal uptake to diagnose Alzheimer's disease. While not highly sensitive, this combination aids in identifying probable Alzheimer's disease patients early.

Area of Science:

  • Neurology
  • Radiology
  • Nuclear Medicine

Background:

  • Alzheimer's disease is the leading cause of dementia, necessitating improved diagnostic accuracy.
  • Current diagnostic criteria require refinement for earlier and more precise identification.

Purpose of the Study:

  • To evaluate the diagnostic utility of combining medial temporal lobe atrophy on CT with decreased temporoparietal uptake on SPECT.
  • To assess the accuracy of this combined imaging approach in a memory clinic population.

Main Methods:

  • A prospective study involving 125 patients (aged 51-93) with probable Alzheimer's disease, possible Alzheimer's disease, or other memory disorders.
  • Utilized temporal-oriented CT for medial temporal lobe atrophy and HMPAO SPECT for temporoparietal uptake assessment.

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Main Results:

  • The combined approach showed a specificity of 0.93 and a positive predictive value of 0.95 for probable Alzheimer's disease.
  • Diagnostic accuracy was 0.68 overall, but decreased to 0.53 in mild stages (MMSE > 18).
  • The association was absent in most frontotemporal dementia cases (27/29).

Conclusions:

  • The combination of CT-defined medial temporal lobe atrophy and SPECT-defined temporoparietal hypoperfusion is a specific but not highly sensitive marker for Alzheimer's disease.
  • This method can assist in the early selection of patients with a high probability of Alzheimer's disease, valuable for clinical trials and research.