Clinical Trial: Brain Changes in Blepharospasm
Study Status: Terminated
Recruit Status: Terminated
Study Type: Observational
Official Title: Suppression and Facilitation of the Motor Cortex by Stimulation of the Cerebellum in Patients With Dystonia and Healthy Controls
Brief Summary:
This study will examine the role of certain areas of the brain in blepharospasm, a type of dystonia (abnormality of movement and muscle tone) that causes unwanted or uncontrollable blinking or closing of the eyelids. The study will compare brain activity in healthy volunteers and in people with blepharospasm to find differences in the brain that may lead to better treatments for dystonia.
Healthy volunteers and people with blepharospasm who are 18 years of age and older may be eligible for this study. All candidates are screened with a medical history. People with blepharospasm also have a physical examination and blepharospasm rating.
Participants undergo transcranial magnetic stimulation (TMS) and electromyography (EMG) in two 4-hour sessions, separated by 1 to 7 days.
TMS
A wire coil is held on the subject s scalp. A brief electrical current is passed through the coil, creating a magnetic pulse that stimulates the brain. The subject hears a click and may feel a pulling sensation on the skin under the coil. There may be a twitch in muscles of the face, arm or leg. During the stimulation, subjects may be asked to tense certain muscles slightly or perform other simple actions. Repetitive TMS involves repeated magnetic pulses delivered in short bursts of impulses. Subjects receive 60 pulses per minute over 15 minutes.
EMG
Surface EMG is done during TMS to measure the electrical activity of muscles. For this test, electrodes (small metal disks) are filled with a conductive gel and taped to the skin of the face.
Detailed Summary:
Objective
Besides alterations in the basal ganglia, substantial evidence identifies cerebellar dysfunction as a possible cause for dystonia. Pathophysiological findings suggest that the cerebellar influence on the primary motor cortex is modified in patients with different forms of dystonia. The objective of this study is to find out whether this cerebellar influence plays a role in dystonic disorders.
Study population
20 patients with blepharospasm, 20 patients with focal hand dystonia, 20 patients with DYT-1 Primary generalized dystonia and 60 healthy volunteers age and sex matched.
Design
Paired pulse transcranial magnetic stimulation (TMS) will be performed at rest and during tonic activation of the first dorsal interosseus muscle (FDI). The conditioning stimulus (CS) will be applied to the ipsilateral cerebellum using different intensities and will precede the test stimulus by intervals from 3 to 10 ms, respectively. The test stimulus (TS) will be applied over the motor hot spot of FDI in the primary motor cortex.
Outcome measures
The primary outcome measure will be the motor evoked potential (MEP) in FDI after a conditioning cerebellar stimulus in relation to the unconditioned MEP size. Each different patient group will be compared separately to the age- and sex-matched healthy controls and between each other. Secondary outcome parameters will be the influence of different interstimulus intervals and different stimulation intensities of the conditioning stimulus on the MEP.
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: June 15, 2007
Date Started: June 12, 2007
Date Completion: June 29, 2012
Last Updated: April 19, 2017
Last Verified: June 29, 2012
