Protocol Number: 06-N-0192

Title:

Blepharospasm and the Experimental Modulation of Cortical Excitability in Primary and Secondary Motor Areas. A Pilot Study.

Number:

06-N-0192

Summary:

This research study will examine whether magnetic or electrical stimulation of the brain can improve the involuntary closure of the eyelids in patients with blepharospasm or Meige syndrome; conditions that belong to a group of neurological disorders called dystonias. Blepharospasm and Meige syndrome cause excessive involuntary closure of the eyelids or blinking. In an earlier study of patients with writer's cramp, which is another form of dystonia, symptoms improved temporarily with brain stimulation.

Interested people 18 years of age or older with blepharospasm or Meige syndrome may be eligible for this study. Candidates are screened with a medical history, physical examination and a blink reflex test.

Participants undergo brain stimulation and evaluations before and after the stimulation to test the response, as follows:

Procedures

-Transcranial magnetic stimulation (TMS): A wire coil is held on the patient'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 the muscles of the face, arm or leg. The subject may be asked to tense certain muscles slightly or perform other simple actions. The effect of TMS on the muscles is detected with small metal disk electrodes taped to the skin of the arms or legs. TMS is done on eight of the ten test days.

-Repetitive TMS (rTMS): The same procedure as TMS, except repeated magnetic pulses are delivered in short bursts. RTMS is done on eight of the ten test days.

-Theta burst stimulation (TBS): A form of rTMS that involves short bursts of impulses. TBS is done on four study days.

-Cathodal transcranial DC stimulation (tDCS): Two conductive-rubber electrodes placed in saline-soaked sponges are positioned over two areas of the head. A constant weak electrical current flow is applied for 20 minutes. tDCS is done on two study days.

Evaluations

-Physician observation: The subject's eyes are videotaped for 5 minutes before and after each TMS session. A physician then counts how many times the subject blinked during the 5 minutes.

-Questionnaire: Subjects are asked to rate their symptoms before and after brain stimulation.

-Electrophysiological test of the blink reflex: Wires are taped to the skin on the nose and temple to record the eye movement during blinking. A thin plastic rod is placed on the skin over the right eyebrow and a small electrical current is passed through it to stimulate the eye muscle. The stimulus is applied to the muscle ten times to determine the least amount of stimuli needed to make the eye blink. Then six paired stimuli are applied to test the blink reflex.

Sponsoring Institute:

National Institute of Neurological Disorders and Stroke (NINDS)

Recruitment Detail

Type: Participants currently recruited/enrolled

Gender: Male & Female

Referral Letter Required: No

Population Exclusion(s): None

Eligibility Criteria:

INCLUSION CRITERIA PATIENTS:

- Patients with idiopathic BSP or Meige-Syndrome (=BSP plus oromandibular dystonia).

- Age 18 years or older.

- Normal findings in the medical history, physical and neurological examination, except for dystonia (in cases that patients have not had an H& P at the NIH within the last 12 months; they will undergo all these exams on the first study day).

- Last treatment with botulinum toxin more than three months ago.

INCLUSION CRITERIA CONTROLS:

-Age 18 years or older

-Normal findings in the medical history, physical and neurological examination

-No history of neuroleptic medications/ prior use of neuroleptics (such as Haldol® (Registered Trademark))

-Not been treated or taken anti-depressants, anti-seizure medication, anticholinergic drugs (such as Artane® (Registered Trademark)) and muscle relaxants within the past 4 weeks

EXCLUSION CRITERIA PATIENTS:

Any of the following will exclude a patient from the study:

- Other disease with involuntary blinking (Hemifacial spasm, Tic disorder, Tardive Dyskinesia, Tardive dystonia, etc).

- BSP and normal recovery of R2 in BRR.

- Participation in a clinical trial in the 2 weeks preceding the study.

- History of seizure disorder.

- Pregnancy- a pregnancy test will be performed for women of childbearing potential.

- Symptoms of a clinically relevant illness in the 4 weeks before the first study day, including history of any other neurological disorders or conditions requiring the use of anti-depressants, neuroleptic medications or anti-seizure meds., anticholinergic drugs and muscle relaxants.

- History of neuroleptic medications/prior use of neuroleptics.

EXCLUSION CRITERIA CONTROLS:

A botulinum toxin injection within 3 months of starting the protocol

Any condition that requires the use of anti-depressants, anti-psychotic or anti-seizure medications

Cannot follow the instruction through the entire recording

Not able to provide consent to participate in the study

Patients will be screened and recruited from the outpatient clinic of the HMCS, NINDS. Age matched volunteers will be recruited from the NIH Patient Recruitment and Public Liaison Office.

Special Instructions:

Currently Not Provided

Keywords:

Blink Reflex

Transcranial Magnetic Stimulation (TMS)

Dystonia

Recruitment Keyword(s):

Blepharospasm

BSP

Focal Dystonia

Condition(s):

Blepharospasm

Focal Dystonia

Investigational Drug(s):

None

Investigational Device(s):

None

Intervention(s):

Procedure/Surgery: repetitive transcranial magnetic stimulation (rTMS)

Supporting Site:

National Institute of Neurological Disorders and Stroke

Contact(s):

Patient Recruitment and Public Liaison Office
Building 61
10 Cloister Court
Bethesda, Maryland 20892-4754
Toll Free: 1-800-411-1222
TTY: 301-594-9774 (local),1-866-411-1010 (toll free)
Fax: 301-480-9793

Electronic Mail:prpl@mail.cc.nih.gov

Citation(s):

Antal A, Kincses TZ, Nitsche MA, Bartfai O, Paulus W. Excitability changes induced in the human primary visual cortex by transcranial direct current stimulation: direct electrophysiological evidence. Invest Ophthalmol Vis Sci. 2004 Feb;45(2):702-7.

Aramideh M, Koelman JH, Speelman JD, Ongerboer de Visser B. Eyelid movement disorders and electromyography. Lancet. 2001 Mar 10;357(9258):805-6.

Aramideh M, Eekhof JL, Bour LJ, Koelman JH, Speelman JD, Ongerboer de Visser BW. Electromyography and recovery of the blink reflex in involuntary eyelid closure: a comparative study. J Neurol Neurosurg Psychiatry. 1995 Jun;58(6):692-8. Erratum in: J Neurol Neurosurg Psychiatry 1995 Dec;59(6):662.

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