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PET Scans in Normal Volunteers and Patients with Fabry Disease



PET Scans in Normal Volunteers and Patients with Fabry Disease

For Condition: Fabry disease,Healthy
Status: Completed
Sponsor(s): National Institute of Neurological Disorders and Stroke (NINDS) ,
Synopsis: This study will determine the rate of sugar metabolism in the brain of patients with Fabry disease, a genetic disease of abnormal lipid metabolism. Compared with healthy people, patients with Fabry disease have increased blood flow to the brain, which may result from abnormal brain metabolic activity. This study will use positron emission tomography (PET) and magnetic resonance imaging (MRI) to compare brain sugar metabolism in eight untreated patients, eight patients who are receiving enzyme replacement therapy, and eight healthy volunteers. Patients with treated and untreated Fabry disease and normal volunteers may be eligible for this study. Participants will undergo the following two procedures: 1. PET scan < The patient lies in the PET scanning machine. First, the chest is scanned for a few minutes to determine how much radiation the tissues of the chest absorb. A radioactive sugar called fluorodeoxyglucose (FDG) is then injected through a catheter (thin plastic tube placed in a vein) and the heart is scanned for about 45 minutes to measure the amount of FDG in the blood inside the heart. The head is then scanned for about 20 minutes to measure FDG in the brain. This measurement tells how much sugar the brain uses for energy. The procedure requires insertion of two or three catheters. A special facemask may be molded to the patient's head to help hold the head still during the scanning. 2. MRI scan < The patient lies on a table surrounded by the scanner (a metal cylinder) for about 60 minutes. A strong magnetic field and radio waves are used to show images of structural and chemical changes in tissues. This study may provide information that will help explain abnormalities in Fabry disease and the effect of treatment on the brain.
Details: We have found that patients with Fabry disease have an increased resting global cerebral blood flow compared with healthy subjects. This augmentation may result from an abnormal metabolic activity in the brain of the patients. The goal of this protocol is to study the cerebral metabolic rate of glucose (rCMRGlu) in eight untreated patients with Fabry disease, eight Fabry patients who are receiving enzyme replacement therapy and compare it with the rCMRGlu eight in healthy volunteers. In order to minimize the need for arterial lines we shall image the left ventricle of the heart to obtain the (18)FDG time-activity curve needed to measure rCMRGlu. The method will be validated in the healthy volunteers.
Eligibility:
Study Type:  Observational, Natural History
Minimum Age/Maximum Age: /
Genders: Male
Protocol Entry Criteria: Hemizygote male Fabry patients 18-50 years-of-age. Must be able to tolerate the procedures. Must be able to give written informed consent.
Total Enrollment: 24

Location and Contact Information:

National Institute of Neurological Disorders and Stroke (NINDS)
Bethesda,  Maryland,  20892
United States
 


Additional Information:
Study ID Numbers:  000106;  00-N-0106
Study Start Date: April 7, 2000
Record last reviewed: March 24, 2000
Additional information available at: clinicaltrials.gov
Clinicaltrials.gov Reference link: NCT00005111

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