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Investigating the Safety of srTMS in the Treatment of Parkinson's Disease

This study has been completed.
Information provided by:
National Institutes of Health Clinical Center (CC) Identifier:
First received: June 24, 2003
Last updated: January 24, 2017
Last verified: April 15, 2009

Super rapid transcranial magnetic stimulation (srTMS) is a method of brain stimulation that may be able to change the electrical activity of the nerve cells of the brain. It has been proposed and tested as a treatment for brain disorders, including Parkinson's disease.

The purpose of this study is to use a device called the magnetic stimulator to investigate the safe limit of srTMS, such as intensity of stimulation and the number of magnetic pulses that may lead to excessive brain stimulation.

Ten patients with Parkinson's disease-whose main problems are slowness of movement and difficulty walking-will participate in this study. They will be asked to come to the laboratory for one experiment. Before and after srTMS treatment, investigators will test participants' brain function with a series of psychological tests and an EEG (electroencephalogram). The srTMS treatment is performed by placing an insulated coil of wire on the scalp and passing a very brief electrical current through the wire coil. The experiment will last 2 to 4 hours.

Condition Intervention Phase
Parkinson Disease
Device: Magstim Rapid Magnetic Stimulator
Phase 1

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: No masking
Primary Purpose: Treatment
Official Title: Safety Study of the Super Rapid Transcranial Magnetic Stimulation in Patients With Parkinson's Disease

Resource links provided by NLM:

Further study details as provided by National Institutes of Health Clinical Center (CC):

Primary Outcome Measures:
  • Testing the safety limit (SL) of 50 Hz srTMS. [ Time Frame: Single visit ]

Estimated Enrollment: 10
Study Start Date: June 18, 2003
Estimated Study Completion Date: April 15, 2009
Detailed Description:
The treatment of Parkinson's disease (PD) needs further improvement, particularly in the areas of gait and freezing. A promising technique is repetitive transcranial magnetic stimulation (rTMS) that, so far, has produced small effects on bradykinesia in drug free patients in limited trials. The relevant rTMS parameters for the therapeutic effect are unknown. Use of very high rTMS frequency (50 Hz, maximum output of the modern TMS machines, super rapid TMS [srTMS] with circular coil design [vs. a figure eight shape]) may further improve the therapeutic effect in people who have PD. The 50 Hz srTMS frequency proposed here is in a range that exceeds the currently established guidelines since such high frequencies have not been investigated. We will look for acute srTMS effects of the primary motor cortex (M1) stimulation (60% to 100% motor threshold [MT] intensity, 0.5 seconds to 2 seconds train duration). A multi-channel electromyography (EMG) record will be visually controlled for signs of increasing time-locked EMG activity, EMG correlates of the spread of excitation through M1, or an increase of M1 excitability to establish the safe superrapid transcranial magnetic stimulation (srTMS) limit. The electroencephalogram (EEG) Record, Folstein Mini-Mental Exam, CFL and FAS Letter Production Test (words beginning with letters 'C', 'F' etc), Serial Reaction Time, Grooved Pegboard Test, and Unified PD Rating Scale (UPDRS) will be done before and after the srTMS session to control possible srTMS side effects.

Ages Eligible for Study:   40 Years to 80 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Subjects will be men and women aged 40 to 80 years with DOPA-responsive, akinetic-rigid PD.

After obtaining the informed consent, patients will be interviewed and examined by either the prinicipal investigator (PI) or a Brain Stimulation Unit (BSU) or an HMCS physician to establish the diagnosis of PD and rule out any other neurologic condition.

Only patients with a Hoehn and Yahr grade of 2 to 4 while 'off' will be accepted.

Patients must be on a regimen including L-DOPA, and they must have a total dose of medication equal to more than 300 mg of L-DOPA equivalent, including their dopamine agonist agents.

Any patient whose record does not contain a neurological examination from the past year will be reexamined before enrollment.


Any significant medical or psychiatric illness (other than PD), pregnancy, history of epilepsy, or concurrent use of tricyclic antidepressants, neuroleptic agents, or any other licit or illicit drugs other than antiparkinsonian agents that could lower the seizure threshold.

Persons with surgically or traumatically implanted foreign bodies such as a pacemaker, or any implanted stimulators, an implanted medication pump, a metal plate in the skull, or metal inside the skull or eyes (other than dental appliances or fillings) that may pose a physical hazard during magnetic stimulation will also be excluded.

Most of these exclusions also come under the category of significant medical illness. Patients for whom participation in the study would, in the opinion of the investigators, cause undue risk or stress for reasons such as tendency to fall, excessive fatigue, general fatigue, general frailty, or excessive apprehensiveness will also be excluded.

A urine sample for the pregnancy test will be obtained from any women of childbearing potential prior to the start of srTMS, on the day of the initial interview and signing of the consent form. Pregnant women will be excluded from the study.

Mentally impaired patients who have no capacity to provide their own consent will be excluded from the study.

  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00063284

United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Institute of Neurological Disorders and Stroke (NINDS)
  More Information

Publications: Identifier: NCT00063284     History of Changes
Other Study ID Numbers: 030220
Study First Received: June 24, 2003
Last Updated: January 24, 2017

Keywords provided by National Institutes of Health Clinical Center (CC):
Electrical Stimulation
Human Brain
Parkinson Disease

Additional relevant MeSH terms:
Parkinson Disease
Parkinsonian Disorders
Basal Ganglia Diseases
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Movement Disorders
Neurodegenerative Diseases processed this record on March 28, 2017