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Spect research

Since the 1980s, there have been thousands of scientific papers on brain SPECT imaging for evaluating many psychiatric and neurological disorders. The Amen Clinics' research library contains our own scientific research along with abstracts of thousands of studies from the U.S. and around the world.

Identification of diabetes-related dementia: Longitudinal perfusion SPECT and amyloid PET studies

AIMS:

We attempted to identify a dementia subgroup with characteristics associated with diabetes mellitus (DM)-related metabolic abnormalities, referred to as diabetes-related dementia, using longitudinal single photon emission computed tomography (SPECT) and Pittsburgh compound-B (PiB) positron emission tomography (PET).

METHODS:

We classified 175 patients with clinically diagnosed Alzheimer disease (AD) and DM into 4 subgroups based on brain imaging in a 2013 study. Among them, we investigated follow-up SPECT studies in 29 patients of an AD group showing decreased regional cerebral blood flow (rCBF) of the parietotemporal lobe on initial SPECT and 18 patients of a diabetes-related dementia group showing neither decreased rCBF of the parietotemporal lobe nor cerebrovascular disease, which is strongly associated with DM-related factors. Eleven of them underwent PiB PET.

RESULTS:

Follow-up SPECT showed more profound rCBF reduction in the parietotemporal lobe and other areas of the AD group, whereas follow-up SPECT showed an rCBF reduction in small areas of the frontotemporal and limbic lobes of the diabetes-related dementia group. Six of 9 patients with diabetes-related dementia were negative or equivocal for PiB binding.

CONCLUSION:

A subset of a dementia subgroup with characteristics predominantly associated with DM-related factors may underlie a pathophysiology different from AD, although these patients were clinically diagnosed as having AD. The identification of diabetes-related dementia may be necessary for considering an appropriate therapy and prevention in clinical practice.

Publication: Journal of the Neurological Sciences

Publication Institution: Department of Geriatric Medicine, Tokyo Medical University, Tokyo, Japan

Publication Date: Dec 20 2014

Publication Author/s: Dec 20 2014

Category: Dementia, Diabetes and Blood Sugar

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