The Effects of Repetitive Paired Associative Stimulation in Dystonia
Investigating the Plastic Effects of Repetitive Paired Associative Stimulation (rPAS) in Dystonia
Background:
- People with dystonia have serious muscle contractions that cause abnormal movements or postures. This significantly affects their daily lives. The common type is called organic. The other type is psychogenic. People with this type have typical symptoms plus some psychological effects. Researchers will look at how rapid transcranial magnetic stimulation (rTMS) of the brain combined with stimulation of a nerve affects the ability to detect sensations. They will compare the responses of people with different types of dystonia. They will also compare the responses of people with dystonia to responses of people without it. This study may help us learn more about the nature of different types of dystonia.
Objectives:
- To see whether TMS combined with nerve stimulation affects the brain differently in people with different types of dystonia and those without dystonia.
Eligibility:
- Individuals at least 18 years old, who are right-handed and have dystonia.
- Healthy volunteers at least 18 years old.
Design:
- Participants will have two clinical visits. Each visit will be a few hours long. They can be done on the same day.
- Participants will be screened with a medical history and physical exam.
- Participants will take several sensory tests. For these tests, electrodes will be placed on their skin. The participants will feel small electric shocks during some of the tests.
- Participants will undergo TMS. For 2 minutes, quick electrical currents will pass through a wire coil placed on their head. As this happens, researchers will ask the participants to move certain muscles.
研究概览
地位
条件
详细说明
Objective:
To investigate the effects of pairing brain and peripheral nerve stimulation in organic and psychogenic dystonia to see if this technique can differentiate them.
Study Population:
We intend to do an internal pilot study of 6 patients with organic dystonia, 6 patients with clinically definite psychogenic dystonia and 6 age-matched healthy volunteers. We will then perform an analysis to see how many subjects we need to prove or disprove a difference between groups.
Design:
Subjects will have a baseline screening visit, electromyography (EMG) and nerve stimulation, sensory threshold testing, and measurements of brain excitability using motor evoked potentials (MEPs) from transcranial magnetic stimulation (TMS). They will then undergo rapid TMS repetitively paired with stimulation of a nerve in the arm. Outcome variables will again be measured immediately after (T0), 30 minutes (T30) after, and 60 minutes (T60) after the end of brain stimulation.
Outcome Measures
Primary outcome variable: Change in MEP amplitudes at T30 from baseline
Secondary outcome variables:
- Input-output curve parameters (measured at baseline, T0, T30, and T60)
- Temporal discrimination threshold (TDT)
Exploratory Measures
- Short interval intracortical inhibition (SICI), a measure of inhibition in the motor cortex
- Influence of Val66Met BDNF polymorphism on the output variables
Repeated measures analyses of variance (ANOVA) will be used to investigate the following three factors on the outcome variables: time (four levels: baseline, T0, T30 and T60) and muscle (two levels: APB and FDI) as within-subject factor and group (three levels: organic dystonia, psychogenic dystonia, and healthy controls) as between-subjects factor. The model of repeated measures ANOVA will include the interactions between the three factors. If the interaction between muscle and group is significant, the interaction between time and group will be evaluated for each muscle separately. If significance is found for time and/or group, then the evaluation will be followed by Tukey Kramer multiple pair-wise comparisons.
研究类型
注册 (实际的)
联系人和位置
学习地点
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Maryland
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Bethesda、Maryland、美国、20892
- National Institutes of Health Clinical Center, 9000 Rockville Pike
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参与标准
资格标准
适合学习的年龄
接受健康志愿者
有资格学习的性别
描述
- INCLUSION CRITERIA:
- For the organic dystonia group: Primary focal dystonia diagnosed or confirmed by a movement disorders neurologist, confirmed at the initial visit by a study investigator.
- For the psychogenic dystonia group: Clinically established psychogenic dystonia or probable psychogenic dystonia, according to the Fahn and Williams criteria confirmed by a movement disorders neurologist.
- For the healthy volunteers group: Age-matched healthy volunteers three will be age matched to pyschogenic dystonia group, and three will be age matched to organic dystonia group.
- Adult patients (at least18 years old).
- Right handed.
- Ability to provide own consent
EXCLUSION CRITERIA:
- Dystonia affecting the right APB and/or FDI, or inability of the subject to perform full range-of-motion exercises with the right FDI and/or APB.
- Medical condition impairing the subject's ability to comply with the study protocol as judged by study investigator, such as but not limited to seizures, brain tumor, stroke, bipolar disorder, depression, hearing problem, uncontrolled systemic hypertension with values above 170/100, heart disease or lung disease, active respiratory disease needing intervention; and pain preventing lying still for up to 40 minutes.
- Current or prior use of botulinum toxin within 3 months prior to TMS intervention.
- Current or prior use of CNS drugs (including antidepressants, anxiolytics, anticonvulsants, antipsychotics, anti-parkinsonian drugs, hypnotics, stimulants, and/or antihistamines) within 1 week prior to TMS intervention.
- Active drug or alcohol intake more than 7 alcohol drinks/week for women and more than 14 alcoholic drinks/week for men.
- Current pregnancy and lactating women. Menopausal status will be determined by the CNS IRB criteria. In women of childbearing potential, a pregnancy test will be performed at least 24 hours prior to TMS procedures.
- Presence of implanted devices such as pacemakers, medication pumps or defibrillators, metal in the cranium except mouth, history of shrapnel injury or any other condition/device that may be contraindicated
- Inability or unwillingness of subject to provide written informed consent.
学习计划
研究是如何设计的？
设计细节
- 时间观点：预期
研究衡量的是什么？
主要结果指标
结果测量 |
大体时间 |
|---|---|
|
Change from baseline in the motor evoked potential (MEP) amplitude at S50 after 30 minutes from rPAS (T30).
大体时间：30 minutes from rPAS
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30 minutes from rPAS
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合作者和调查者
出版物和有用的链接
一般刊物
- Avanzino L, Martino D, van de Warrenburg BP, Schneider SA, Abbruzzese G, Defazio G, Schrag A, Bhatia KP, Rothwell JC. Cortical excitability is abnormal in patients with the "fixed dystonia" syndrome. Mov Disord. 2008 Apr 15;23(5):646-52. doi: 10.1002/mds.21801.
- Awiszus F. TMS and threshold hunting. Suppl Clin Neurophysiol. 2003;56:13-23. doi: 10.1016/s1567-424x(09)70205-3. No abstract available.
- Cheeran B, Talelli P, Mori F, Koch G, Suppa A, Edwards M, Houlden H, Bhatia K, Greenwood R, Rothwell JC. A common polymorphism in the brain-derived neurotrophic factor gene (BDNF) modulates human cortical plasticity and the response to rTMS. J Physiol. 2008 Dec 1;586(23):5717-25. doi: 10.1113/jphysiol.2008.159905. Epub 2008 Oct 9.
研究记录日期
研究主要日期
学习开始
初级完成 (实际的)
研究完成 (实际的)
研究注册日期
首次提交
首先提交符合 QC 标准的
首次发布 (估计)
研究记录更新
最后更新发布 (实际的)
上次提交的符合 QC 标准的更新
最后验证
更多信息
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