Active clinical trials for "Dystonic Disorders"

Movement disorder involve recurring or constant muscle contractions causing squeezing or twisting movement, such as hemifacial spasm, blepharospasm, cervical dystonias etc. The most common focal dystonia was cervical dystonia in western countries according to previous studies, which is different from China in Chinese neurologists' opinion. And there is no such survey. So the investigators are conducting a movement disorder survey in east China to confirm it.

This study will use transcranial magnetic stimulation to examine how the brain controls muscle movement in focal and generalized types of dystonia. Dystonia is a movement disorder in which involuntary muscle contractions cause uncontrolled twisting or abnormal postures. Dystonia may be focal, involving just one region of the body, such as the hand, neck or face. Focal dystonia usually begins in adulthood. Generalized dystonia, on the other hand, generally begins in childhood or adolescence. Symptoms begin in one area and then become more widespread. Healthy normal volunteers and patients with focal or generalized dystonia 8 years of age and older may be eligible for this study. First-degree relatives of patients will also be enrolled. In transcranial magnetic stimulation, an insulated wire coil is placed on the subject's scalp and brief electrical currents are passed through the coil, creating magnetic pulses that pass into the brain. These pulses generate very small electrical currents in the cortex-the outer part of the brain-briefly disrupting the function of the brain cells in the stimulated area. The stimulation may cause muscle twitching or tingling in the scalp, face and limbs. During the stimulation, the subject will be asked to either keep the hand relaxed or to slightly tense certain muscles in the hand or arm. The test will last about 1.5 hours. The cause of dystonia is unknown. It is hoped that a comparison of brain activity in normal volunteers, patients and their relatives not affected by dystonia will help scientists learn why some people develop dystonic movements.

To address joint position sense in cervical dystonia patients and how it affects the brain activity.

Dystonia is a disabling movement disorder characterized by repetitive patterned or sustained muscle contractions causing twisting or abnormal postures that may afflict 250,000 people in the U.S. While the pathophysiology of dystonia remains uncertain the treatment is rather rudimentary. A better understanding of neural mechanisms of dystonias is not only an invaluable prerequisite for developing better treatment options but also a step toward better understanding of the complex network of basal ganglia. In this study I will investigate if there is any difference between the dopamine receptors and dopamine in people with dystonia and healthy subjects.

This study will examine how chemical changes in the brain produce symptoms of hand dystonia. Patients with dystonia have muscle spasms that cause uncontrolled twisting and repetitive movement or abnormal postures. In focal dystonia, just one part of the body, such as the hand, neck or face, is involved. The study will use positron emission tomography (PET) to find our which areas of the brain in patients with focal hand dystonia differ from healthy volunteers without focal hand dystonia. Healthy volunteers and patients with focal hand dystonia between 18 and 65 years of age may be eligible for this study. Candidates are screened with a medical history and physical and neurological examinations. Participants undergo the following procedures: PET scanning: The PET scanner is shaped like a doughnut. The subject lies on a bed that can slide in and out of the scanner. A custom-molded plastic mask is placed on the face and head to support the head and prevent it from moving during scanning. Two radioactive substances - five doses (one per scan) of [15 O] water and one dose of [11C] flumazil are injected into the body through a vein. The dose of injected radioactive substance is very small, and they are not harmful to the body. The [15 O] water doses are injected during the first hour and scans are taken every 10 minutes. The [11C] flumazil is injected during the second hour. The radioactive substances are detected by the PET scanner and provide information on the functioning of the brain chemistry. MRI scanning: MRI uses a magnetic field and radio waves to produce images of body tissues and organs. The patient lies on a table that is moved into the scanner (a narrow cylinder), wearing earplugs to muffle loud knocking and thumping sounds that occur during the scanning process. Scanning time for this study will be less than one hour. Subjects may be asked to lie still for up to 10 minutes at a time.

This study will examine how the brain coordinates movement in patients with focal hand dystonia. Patients with dystonia have muscle spasms that cause uncontrolled twisting and repetitive movement or abnormal postures. In focal dystonia, just one part of the body, such as the hand, neck or face, is involved. This study will use transcranial magnetic stimulation (TMS, see below) to study how the brain plans movement. Healthy volunteers and patients with focal hand dystonia 18 years of age and older may be eligible for this study. Healthy subjects may participate in one, two or three of the experiments described below. Patients with dystonia may participate in experiments one and three. Before each experiment, each subject is asked about his/her medical and neurologic history, complete questionnaires and will undergo a brief physical examination. Experiment 1 Surface EMG: Small electrodes are taped to the skin over the arm to measure the electrical activity of muscles. 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. During the stimulation, the subject may be asked to tense certain muscles slightly or perform other simple actions. The stimulation may cause a twitch in muscles of the face, arm, or leg, and the subject may hear a click and feel a pulling sensation on the skin under the coil. Experiment 2 (Two visits.) Visit 1: Magnetic resonance imaging (MRI): This test uses a magnetic field and radio waves to obtain images of body tissues and organs. The patient lies on a table that is moved into the scanner (a metal cylinder), wearing earplugs to muffle loud knocking and thumping sounds that occur during the scanning process. The procedure lasts about 90 minutes, during which time the patient will be asked to lie still for up to 30 minutes at a time. Visit 2: Surface EMG and TMS Experiment 3 -Surface EMG and TMS - During the TMS, subjects are asked to respond to shapes on a computer screen by pushing a button or pressing a foot petal.

This study will look for abnormalities in a brain of persons affected with spasmodic dysphonia, a form of movement disorder that involves involuntary "spasms" of the muscles in the vocal folds causing breaks of speech and affecting voice quality. The causes of this disorder are not known. The study will compare results of magnetic resonance imaging (MRI) in people with spasmodic dysphonia and in healthy volunteers. People with adductor or abductor spasmodic dysphonia and healthy volunteers may be eligible for this study. Candidates are screened with a medical history, physical examination, and a test called nasolaryngoscopy. For this test, the inside of the subject's nose is sprayed with a decongestant, and a small, flexible tube called a nasolaryngoscope is passed through the nose to the back of the throat to allow examination of the larynx (voice box). During this procedure, the subject is asked to perform tasks such as talking, singing, whistling, and saying prolonged vowels. The nasolaryngoscope is connected to a camera to record the movements of the vocal folds during these tasks. Eligible participants then undergo MRI of the brain. MRI uses a strong magnetic field and radio waves instead of x-rays to obtain images of body organs and tissues. For this test, the subject lies on a table that slides into the MRI scanner, a narrow metal cylinder, wearing ear plugs to muffle loud knocking sound that occurs during the scan. During MRI anatomical images of the brain are obtained. Subject may be asked to participate in up to two scanning sessions. Each session takes about 1-1/2 hours. Participants may also be asked to volunteer for a brain donation program which is optional. Information gained from donated tissue may lead to better treatments and potential cures for spasmodic dysphonia.

X-linked dystonia-parkinsonism (XDP) is a rare, X-linked, adult-onset, and progressive movement disorder seen almost exclusively in men from Panay Island in the Philippines. The disease is associated with mutations involving the DYT3/TAF1 gene, and all the cases described so far have been linked to Filipino ancestry. Although XDP is very rare globally, the prevalence is 5.74 per 100,000 individuals in Panay Island and 0.31 per 100,000 in the Philippines as a whole. Majority of patients (95%) were males, and the mean age of onset was 39 years. The mean duration of illness was 16 years, and the mean age of death was 55.6 years.

In this study we are looking at primary focal dystonias, including dystonias of the limbs, eyes, jaw or face, neck, and vocal chords. This study will use magnet resonance imaging (MRI) to see how the brain reacts while resting and doing a finger-tapping task. The investigators will test the hypothesis that disturbances in functional connectivity within the motor, affective and cognitive basal ganglia networks in primary focal dystonia (PFD) underlie the motor and non-motor symptoms in this disorder.

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.