Clinical Trial: PET Imaging of GABA Receptors in Succinic Semialdehyde Dehydrogenase Deficiency
Study Status: Completed
Recruit Status: Completed
Study Type: Observational
Official Title: PET Imaging of GABA Receptors in Succinic Semialdehyde Dehydrogenase Deficiency
Brief Summary:
This study will use brain imaging to map brain cell receptors for a chemical called GABA, a chemical that inhibits the activities of nerve cells. The study includes patients with succinic semialdehyde dehydrogenase deficiency, or SSADH (a disorder in which an enzyme deficiency disrupts GABA metabolism), their parents, and healthy volunteers. SSADH deficiency causes various neurological and neuromuscular problems, including mild to severe mental retardation, delays in the acquisition of skills requiring the coordination of mental and physical activities (psychomotor retardation), delays in language and speech development, and other symptoms.
Healthy volunteers 18-55 years of age, patients with SSADH between 5 and 24 years of age, and parents of patients 18-55 years of age may be eligible for this study.
Participants undergo magnetic resonance imaging (MRI) and positron emission tomography (PET) scanning as follows:
Magnetic resonance imaging
MRI uses a magnetic field and radio waves to produce images of body tissues and organs. For this procedure, the subject lies on a table that is moved into the scanner (a narrow metal cylinder surrounded by a magnetic field) wearing earplugs to muffle loud knocking and thumping sounds that occur during the scanning process. Scanning time varies from 20 minutes to 3 hours, with most scans lasting between 45 and 90 minutes. Participants may be asked to lie still for up to 90 minutes at a time. In addition to standard MRI, participants may also have new types of MRI that may detect brain abnormalities when regular MRI is normal, such as diffusion tensor MRI and magnetic resonance spectroscopy. There are no noticeable differences from ordinary MRI scans.
Objective: To measure CNS GABA receptors and GABA levels in patients with succinic semialdehyde dehydrogenase (SSADH) deficiency, a severe pediatric neurotransmitter disease.
Study Population: The study will include children and young adult patients with the disorder, as well as parents of patients (obligate heterozygotes), and adult normal volunteers.
Design: this is a natural history study using neuroimaging techniques. We will perform 11C-flumazenil PET scans, and magnetic resonance spectroscopy (MRS). We will perform neurological examinations to obtain data on clinical manifestations of the condition.
Outcome measures: The outcome measures will be the distribution of CNS binding of 11C-flumazenil, and brain GABA levels measured by MRS, and their relation to clinical manifestations such as motor, speech, and language impairment, hypotonia, hyporreflexia, and seizures. We expect to show that patients with SSADH deficiency will have multifocal reductions in FMZ binding and increased brain GABA levels in a similar pattern.
Sponsor: National Institute of Neurological Disorders and Stroke (NINDS)
Current Primary Outcome:
Original Primary Outcome:
Current Secondary Outcome:
Original Secondary Outcome:
Information By: National Institutes of Health Clinical Center (CC)
Dates:
Date Received: October 29, 2005
Date Started: October 24, 2005
Date Completion: October 19, 2010
Last Updated: January 24, 2017
Last Verified: October 19, 2010
