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New study supports use of PET scans in early diagnosis of Alzheimer's disease

Reston, VA Early diagnosis of Alzheimer's disease (AD) has become vitally important now that drugs are available that may help slow the otherwise unremitting course of the disease. But an accurate diagnosis is critical when initiating early therapy since some of the most promising treatments have been shown to exacerbate other forms of dementia.

Recent studies have demonstrated that Positron Emission Tomography (PET) scans may be the most accurate method of diagnosing AD, particularly in its early stages. Given the potential benefits of early diagnosis, the issue of insurance coverage for PET diagnosis of AD has become a focal point of discussion among legislators, researchers in the nuclear medicine field, other physicians, and the general public.

A study appearing in the March issue of The Journal of Nuclear Medicine identifies a new PET technique that may increase the already high accuracy of PET in diagnosing AD at a very early stage. Researchers reported that AD-related processes leading to altered brain connections between the entorhinal cortex (EC) and both hemispheres of the brain can be clearly identified with 18F-FDG PET.

The EC is a small area located deep in the brain that plays a central role in memory functions, and is an early site for neuronal damage resulting in memory impairment in AD. The EC is normally connected to other areas of the brain that constitute the so-called "neo-cortex", i.e. the shell of the brain, in both hemispheres.

"This study shows that most of these connections between the hemispheres are destroyed at a very early stage of AD. For example, when brain metabolism is reduced in the right EC, a parallel reduction can be found in the right neocortical areas. Such a pattern of coupled metabolic reductions between the deep and surface brain may make PET even more accurate at differentiating AD from other forms of dementia," said lead author Lisa Mosconi, MD, of the Department of Clinical Pathophysiolo
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Contact: Gavin McDonald
gmcdonald@kamber.com
202-955-1250
Society of Nuclear Medicine
11-Mar-2004


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