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Home > "C" Clinical Trials Conditions > Cortical Excitability in Obsessive-Compulsive and Related Disorders  Cortical Excitability in Obsessive-Compulsive and Related Disorders
Cortical Excitability in Obsessive-Compulsive and Related Disorders
For Condition: Obsessive Compulsive Disorder,Healthy
Status: Completed
Sponsor(s): National Institute of Mental Health (NIMH) ,
Synopsis: This study will use transcranial magnetic stimulation (TMS) to study the function of the cerebral cortex (outer layer of the brain) in people with obsessive compulsive disorder (OCD) and related disorders. A non-invasive procedure, TMS activates areas of the brain with magnetic pulses that travel through the scalp and head and cause small electrical currents in the brain. People 18 years of age and older with OCD and disorders that may be related-tic disorders, such as Tourette's syndrome, focal dystonia (localized muscle cramps), body dysmorphic disorder (hypersensitivity to changes in appearance), eating disorders, such as anorexia nervosa, trichotillomania (compulsive hair-pulling)-may be eligible for this study. Healthy normal volunteers will also be enrolled. Candidates will be screened by telephone interview. Participants will undergo TMS. For this procedure, an insulated wire coil is placed on the subject's head. A brief electrical current passes through the coil, creating a magnetic pulse that travels through the scalp and skull and causes small electrical currents in the outer part of the brain. The stimulation may cause muscle, hand or arm twitching, or may affect movement or reflexes. During the stimulation, the subject may be asked to tense certain muscles slightly or perform other simple actions. The electrical activity of muscles during stimulation is recorded with a computer or other recording device, using electrodes attached to the skin with tape. Subjects will receive fewer than 500 magnetic pulses, and the study will take less than 3 hours. Participants may repeat the procedure on several occasions, if they agree.
Details: Transcranial magnetic stimulation (TMS), a noninvasive means of stimulating the brain through the scalp and skull, has become an important tool in neurophysiology and neuropsychiatry. The purpose of this project is (1) to use TMS as a probe of cortical excitability to investigate the physiology of the cerebral cortex in Obsessive-Compulsive Disorder (OCD) and OCD-related disorders (including the "OCD spectrum"), which we believe to be disorders involving alterations in the excitability of the cortex; (2) to compare those findings to results in healthy individuals, and (3) to evaluate the possible effects of various pharmacological treatments on TMS parameters in individuals with OCD and OCD-related disorders. This protocol seeks to evaluate the hypothesis that TMS may provide a sensitive measure of cortical function that is relevant to the underlying pathology in OCD and OCD-related disorders. The identification of possible anomalies of TMS measures in these patient groups and changes elicited by pharmaceutical agents will be useful in orienting research towards investigations of the cortical neurotransmitter systems.
Eligibility:
Study Type: Observational, Natural History
Minimum Age/Maximum Age: /
Genders: Both
Protocol Entry Criteria: INCLUSION CRITERIA: Subjects will be screened for history of significant medical and non-OCD-related neuropsychiatric illnesses by means of a phone screening and interview with a trained screener (nurse, physician, social worker or psychologist). Each patient and healthy volunteer entered into the study must be free of significant medical or psychiatric illness and not taking any medications with neurological or psychotropic effects. The presence of neurological abnormalities will not be an exclusionary criterion because of the existence of lesional OCD & OCD spectrum disorders that may co-exist with neurological disorders. EXCLUSION CRITERIA: The only exclusionary criteria for this study are subjects who have a pacemaker, an implanted medication pump, a metal plate in the skull, metal objects inside the eye or skull (for example, after brain surgery or a shrapnel wound) or any recent (less than 3 months) brain lesions. Subjects under 18 years of age will be excluded.
Total Enrollment: 145
Location and Contact Information:
National Institute of Mental Health (NIMH)
Bethesda, Maryland, 20892
United States
Additional Information:
Study ID Numbers: 020076; 02-M-0076
Study Start Date: January 2, 2002
Record last reviewed: December 31, 2003
Additional information available at: clinicaltrials.gov
Clinicaltrials.gov Reference link: NCT00029068
Other Healthy Studies:
1. Cortical Excitability in Obsessive-Compulsive and Related Disorders
2. Preventive Measures for Childhood-Onset Obsessive-Compulsive Disorder and Tic Disorders (PANDAS Subgroup)
3. St. John’s Wort vs. Placebo in Obsessive-Compulsive Disorder.
4. Evaluation and Follow-up of Individuals with Obsessive-Compulsive Disorder and Related Conditions
5. Amoxicillin for the Treatment of Pediatric Autoimmune Disorders Associated with Streptococcal Infections
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Cortical Excitability in Obsessive-Compulsive and Related Disorders
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