Ignite Creation Date:
2024-05-05 @ 11:35 AM
Last Modification Date:
2024-10-26 @ 9:10 AM
Study NCT ID:
NCT00082615
Status:
COMPLETED
Last Update Posted:
2017-07-02
First Post:
2004-05-13
Brief Title:
Neurophysiological Markers in Patients With Craniofacial Dystonia and Their Relatives
Sponsor:
National Institute of Neurological Disorders and Stroke NINDS
Organization:
National Institutes of Health Clinical Center CC
Study Overview
Official Title:
Neurophysiological Markers in Patients With Craniofacial Dystonia and Their Relatives
Status:
COMPLETED
Status Verified Date:
2008-04-21
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
This study will use a technique called blink reflex to study and compare how the brain controls muscle movement in patients with craniofacial dystonia their first-degree relatives and healthy normal volunteers People with dystonia have sustained muscle contractions that cause twisting and repetitive movements or abnormal postures In focal dystonia this happens in one area of the body such as the hand neck or face
Three groups of people may be eligible for this study 1 patients 18 years of age and older with craniofacial dystonia 2 first-degree relatives of patients with craniofacial dystonia and 3 normal volunteers matched in age to the patients Candidates are screened with physical and neurological examinations
Participants undergo a blink reflex study Patients with dystonia who are receiving botulinum toxin injections must stop the medication 3 months before participating in the study and must stop any other dystonia medications such as benzodiazepines and anticholinergics for 12 hours before the study For the blink reflex procedure subjects are seated in a comfortable chair with their hands placed on a pillow on their lap Metal electrodes are taped to the forehead for delivering small electrical shocks that feel like very brief pinpricks Subjects receive 25 to 50 electrical stimuli some as single shocks and some in pairs The electrical activity of muscles that respond to the stimuli is recorded with a computer The study takes from about 1 to 2 hours
Three groups of people may be eligible for this study 1 patients 18 years of age and older with craniofacial dystonia 2 first-degree relatives of patients with craniofacial dystonia and 3 normal volunteers matched in age to the patients Candidates are screened with physical and neurological examinations
Participants undergo a blink reflex study Patients with dystonia who are receiving botulinum toxin injections must stop the medication 3 months before participating in the study and must stop any other dystonia medications such as benzodiazepines and anticholinergics for 12 hours before the study For the blink reflex procedure subjects are seated in a comfortable chair with their hands placed on a pillow on their lap Metal electrodes are taped to the forehead for delivering small electrical shocks that feel like very brief pinpricks Subjects receive 25 to 50 electrical stimuli some as single shocks and some in pairs The electrical activity of muscles that respond to the stimuli is recorded with a computer The study takes from about 1 to 2 hours
Detailed Description:
The objective of this study is to evaluate paired-pulse inhibition of the three responses of the electrically elicited blink reflex BR and the eye blink rate EBRin patients with craniofacial dystonia and their first degree relatives in order to determine whether abnormalities of inhibition can represent a marker of genetic predisposition for the development of dystonia It is unclear why some relatives of patients with craniofacial dystonia do not develop dystonic symptoms One possible explanation is that the development of dystonia is a two-stage process first loss of inhibition which may be genetically determined and second exposure to an environmental trigger such as excessive repetitive movements There is good evidence that focal dystonia is a genetically determined disorder but the responsible gene remains undetermined Patients their first degree relatives and normal volunteers will undergo BR testing using validated electrophysiological tests of recovery cycle The main outcome measure of the study is impaired inhibition in up to 50 of first degree relatives of patients with focal dystonia which would serve as biologic marker for the carrier state A second outcome measure is the EBR In those individuals with this genetic marker of impaired inhibition future linkage analysis studies could be performed to identify the causative gene
Study Oversight
Has Oversight DMC:
None
Is a FDA Regulated Drug?:
None
Is a FDA Regulated Device?:
None
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?:
None
Secondary IDs
| Secondary ID | Type | Domain | Link |
|---|---|---|---|
| 04-N-0188 | None | None | None |