Navigation Links
PET's targeted imaging may lead to earlier diagnosis of dementia and Alzheimer's disease
Date:3/5/2008

Reston, Va.Researchers involved in a large, multi-institutional study using positron emission tomography (PET) imaging with the radiotracer fluorodeoxyglucose (FDG) were able to classify different types of dementia with very high rates of success, raising hopes that dementia diagnoses may one day be made at earlier stages.

Previously, scientists have been able to look only at the surface of the brain to differentiate various types of dementia, said Lisa Mosconi, Ph.D., assistant professor of psychiatry at the New York University School of Medicine. With FDG PET, we were able to develop standardized disease-specific patterns from which we could correctly classify dementia more than 94 percent of the time.

The study, which was reported in the March issue of the Journal of Nuclear Medicine, measured the cerebral metabolic rate of glucose (CMRglc)the amount of sugar the brain uses to fuel its activitiesin various areas of the organ. A decrease in this rate is indicative of a loss of nerve cells and of dysfunction associated with dementia. Because FDG behaves like glucose when injected into the body, its location in the PET scans pinpointed the specific area where glucose utilization had fallen below normal levels as compared to an age-appropriate control group.

Each type of dementia examinedAlzheimers disease (AD), frontotemporal dementia (FTD), and dementia with Lewy bodies (DLB)affects a different area of the brain. Based on where in the brain this decrease occurred, we were able to determine which type of dementia a patient had, Mosconi explained.

For instance, only AD patients have severe CMRglc reductions in the hippocampus (a part of the brain located deep in the organ and, prior to this study, unreachable for examination), whereas FTD patients have only mild abnormalities in the area and DLB patients have no hippocampal hypometabolism. We believe that the ability to measure this embedded area in the brain will be important in identifying AD at an early stage, added Mosconi.

This is also the first study to use FDG PET to compare an early stage of dementia known as mild cognitive impairment (MCI) with dementing diseases other than AD. According to the researchers, the results suggest that the ability to detect differentiated uptake of glucose may result in earlier and more accurate diagnoses of MCI and better disease management.

Because the incidence of these disorders is expected to increase dramatically as the baby-boomer generation ages, accurate diagnosis is extremely importantparticularly at the early and mild stages of dementia when life-style changes and therapeutic interventions would be most effective, said Mosconi.

AD and other forms or dementia can take several years to progress to a debilitating stage, and a diagnosis based on FDG-PET assessments at the first sign of onset may improve the prognosis of MCI patients. Early diagnosis may enable earlier treatment and empower people to plan for their future sooner, including financial and legal matters. It is also important for individuals at risk to take care of treatable risk factors, such as hypertension and high cholesterol levels, said Mosconi. By changing their diet and increasing exercise, many MCI patients may deter dementia for yearsperhaps even until more effective treatments are developed.

The study comprised 548 subjects and is the largest FDG PET study measuring brain metabolism in different dementing disorders to date. Researchers from PET centers in the United States and Europe were able to apply and share objective image analysis procedures easily, opening up the possibility that this diagnostic procedure could be adapted to a clinical setting.

Dementia is a general term for a progressive brain dysfunction that results in the loss of memory and other intellectual abilities serious enough to interfere with daily life. MCI patients demonstrate a decline of cognitive performance that is more pronounced than expected from age but not severe enough to meet criteria for dementia. The clinical course of these patients is challenging to forecast on the basis of clinical measures alone. Many diseases can result in a form of dementia, the most common one being AD, a progressive and fatal brain disease. According to the Alzheimers Association, more than five million people in the United States have AD, and by 2050, that number could triple. Currently it is the seventh leading cause of death in the United States.


'/>"/>

Contact: Kathryn Wiley
kwiley@snm.org
703-326-1184
Society of Nuclear Medicine
Source:Eurekalert

Related medicine news :

1. Pain Management For Your Pets, Key Information Every Pet Owner Should Know - Live Webcast to Pet Owners, March 13, 8:00 p.m. to 9:00 p.m. (EDT) Via Morris Animal Foundation
2. Pain Management For Pets, Key Strategies For Veterinarians - Live Webcast to Veterinarians, March 13, 7:00 p.m. to 8:00 p.m. (EDT) Via Morris Animal Foundation
3. Pet Owner Survey Finds Misconceptions About Aging Pets; Debunks Myths, Offers Advice on Improving Senior Pet Care
4. Owners Reminded That Pets Need Dental Care, Too
5. Protect Pets From Winters Hidden Dangers
6. All Pets With Cancer in U.S. Provided Free Consultation
7. Maine Natural Health Company Brings Omega-3 Benefits to Pets
8. Banfield, The Pet Hospital(R) and Meals On Wheels Association of America(R) Feed Hungry Pets During the Holidays and Beyond
9. PetScreen Supports Morris Animal Foundation Canine Cancer Campaign; Co-Sponsors Two Canine Cancer Studies
10. United Animal Nations Offers Financial Assistance Grants of up to $500 to Help Southern California Fire Victims Obtain Vet Care, Temporary Boarding for Pets
11. Nations Largest Pet Insurer Reveals Top 10 Items Surgically Removed From Pets
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/9/2016)... ... 09, 2016 , ... An inventor from Cana, Va., wanted to fulfill the ... amusement park rides. , The patent-pending SAFETY STRAP FOR AMPUTEES improves accessibility. It eliminates ... be set up in a matter of minutes, or even seconds. The SAFETY STRAP ...
(Date:12/9/2016)... PA (PRWEB) , ... December 09, 2016 , ... "I ... said an inventor from Winchester, Va. "I thought that if the nebulizer had a ... treatments rather than fearing them." , He developed the patent-pending NEBY to avoid the ...
(Date:12/8/2016)... ... December 08, 2016 , ... After enjoying record-breaking ... registration today for its 33rd Annual Issues & Research Conference, March 2-3, ... theme of the conference is “Persistent Challenges and New Opportunities: Using Research to ...
(Date:12/8/2016)... ... December 08, 2016 , ... Mirixa Corporation ... adherence, and other pharmacist-delivered patient care services, has announced the promotions of Karen ... to vice president of sales. , Litsinger joined Mirixa in 2008 after ...
(Date:12/8/2016)... ... December 08, 2016 , ... Premier Fitness Camp (PFC) ... , the ultimate weight loss and wellness program, at their world headquarters of Omni ... provide immediate and long-term results to anyone seeking weight loss, personal development, a healthy ...
Breaking Medicine News(10 mins):
(Date:12/8/2016)... , Dec. 8, 2016  Valeant Pharmaceuticals ... TSX: VRX) ("Valeant") today announced positive results from ... study to assess the safety and efficacy of ... treatment of plaque psoriasis. Within ... with moderate to severe psoriasis, IDP-118 showed statistical ...
(Date:12/8/2016)... FRISCO, Texas , Dec. 8, 2016 /PRNewswire/ ... new program that brings leading-edge laboratory services and ... the United States , allowing more doctors ... and health care management solutions. Logo ... Hospital systems, under pressure to ...
(Date:12/8/2016)... , December 8, 2016 Information products ... metrics in Scopus , the world,s largest abstract ... access to comprehensive metrics for journals from over 5,000 publishers. The ... which journals to subscribe to and when to adjust a journal,s ... , , ...
Breaking Medicine Technology: