Transcranial magnetic stimulation
Transcranial magnetic stimulation (TMS), also known as repetitive transcranial magnetic stimulation (rTMS), is a noninvasive form of brain stimulation in which a changing magnetic field is used to cause electric current at a specific area of the brain through electromagnetic induction. An electric pulse generator, or stimulator, is connected to a magnetic coil, which in turn is connected to the scalp. The stimulator generates a changing electric current within the coil which induces a magnetic field; this field then causes a second inductance of inverted electric charge within the brain itself.:3
|Transcranial magnetic stimulation|
Transcranial magnetic stimulation
|Specialty||neurophysiology, neuropsychology, neurotechnology|
Adverse effects of TMS are rare, and include fainting and seizure. Other potential issues include discomfort, pain, hypomania, cognitive change, hearing loss, and inadvertent current induction in implanted devices such as pacemakers or defibrillators.
TMS is non-invasive, and does not require surgery or electrode implantation. Its use can be divided into diagnostic and therapeutic applications. Effects vary based on frequency and intensity of the magnetic pulse as well as the length of the train, which affects the total number of pulses given.
TMS can be used clinically to measure activity and function of specific brain circuits in humans, most commonly with single or paired magnetic pulses. The most widely accepted use is in measuring the connection between the primary motor cortex of the central nervous system and the peripheral nervous system to evaluate damage related to past or progressive neurologic insult.
Repetitive high frequency TMS (rTMS) has shown diagnostic and therapeutic potential with the central nervous system in a variety of disease states, particularly in the fields of neurology and mental health.
Although TMS is generally regarded as safe, risks are increased for therapeutic rTMS compared to single or paired diagnostic TMS. Adverse effects generally increase with higher frequency stimulation.
The greatest immediate risk is fainting, though this is uncommon. Seizures have been reported, but are extremely rare. Other adverse effects include short term discomfort, pain, brief episodes of hypomania, cognitive change, hearing loss, impaired working memory, and the induction of electrical currents in implanted devices such as cardiac pacemakers.
During the procedure, a magnetic coil is positioned at the head of the person receiving the treatment using anatomical landmarks on the skull, in particular the inion and nasion. The coil is then connected to a pulse generator, or stimulator, that delivers electric current to the coil.
TMS uses electromagnetic induction to generate an electric current across the scalp and skull. A plastic-enclosed coil of wire is held next to the skull and when activated, produces a magnetic field oriented orthogonal to the plane of the coil. The magnetic field can then be directed to induce an inverted electric current in the brain that activates nearby nerve cells in a manner similar to a current applied superficially at the cortical surface.
The magnetic field is about the same strength as an MRI, and the pulse generally reaches no more than 5 centimeters into the brain, unless using a modified coil and technique for deeper stimulation.
From the Biot–Savart law,
it has been shown that a current through a wire generates a magnetic field around that wire. Transcranial magnetic stimulation is achieved by quickly discharging current from a large capacitor into a coil to produce pulsed magnetic fields between 2 and 3 Tesla in strength. Directing the magnetic field pulse at a targeted area in the brain causes a localized electrical current which can then either depolarize or hyperpolarize neurons at that site. The magnetic flux generated by the current causes its own electric field, as explained by the Maxwell-Faraday equation,
This electric field causes a change in transmembrane currents resulting in depolarization or hyperpolarization of neurons, causing them to be more or less excitable, respectively.
Deep TMS can reach up to 6 cm into the brain to stimulate deeper layers of the motor cortex, such as that which controls leg motion. The path of this current can be difficult to model because the brain is irregularly shaped with variable internal density and water content, leading to a nonuniform magnetic field strength and conduction throughout its tissues.
Frequency and durationEdit
The effects of TMS can be divided based on frequency, duration and intensity (amplitude) of stimulation:
- Single or paired pulse TMS causes neurons in the neocortex under the site of stimulation to depolarize and discharge an action potential. If used in the primary motor cortex, it produces muscle activity referred to as a motor evoked potential (MEP) which can be recorded on electromyography. If used on the occipital cortex, 'phosphenes' (flashes of light) might be perceived by the subject. In most other areas of the cortex, there is no conscious effect, but behaviour may be altered (e.g., slower reaction time on a cognitive task), or changes in brain activity may be detected using diagnostic equipment.
- Repetitive TMS produces longer-lasting effects which persist past the period of stimulation. rTMS can increase or decrease the excitability of the corticospinal tract depending on the intensity of stimulation, coil orientation, and frequency. Low frequency rTMS with a stimulus frequency less than 1 Hz is believed to inhibit cortical firing while a stimulus frequency greater than 1 Hz, or high frequency, is believed to provoke it. Though its mechanism is not clear, it has been suggested as being due to a change in synaptic efficacy related to long-term potentiation (LTP) and long-term depression (LTD).
Most devices use a coil shaped like a figure-eight to deliver a shallow magnetic field that affects more superficial neurons in the brain. Differences in magnetic coil design should be considered when comparing results, with important elements including the type of material, geometry and specific characteristics of the associated magnetic pulse.
The core material may be either a magnetically inert substrate ('air core'), or a solid, ferromagnetically active material ('solid core'). Solid cores result in more efficient transfer of electrical energy to a magnetic field and reduce energy loss to heat, and so can be operated with the higher volume of therapy protocols without interruption due to overheating. Varying the geometric shape of the coil itself can cause variations in focality, shape, and depth of penetration. Differences in coil material and its power supply also affect magnetic pulse width and duration.
A number of different types of coils exist, each of which produce different magnetic fields. The round coil is the original used in TMS. Later, the figure-eight (butterfly) coil was developed to provide a more focal pattern of activation in the brain, and the four-leaf coil for focal stimulation of peripheral nerves. The double-cone coil conforms more to the shape of the head. The Hesed (H-core), circular crown and double cone coils allow deeper magnetic penetration than the standard 2 cm. They can impact deeper areas in the motor cortex and cerebellum controlling the legs and pelvic floor, for example, though the increased depth comes at the cost of a less focused magnetic pulse.
Luigi Galvani undertook research on the effects of electricity on the body in the late 1700s, and laid the foundations for the field of electrophysiology. In the 1800s Michael Faraday discovered that an electrical current had a corresponding magnetic field, and that changing one could induce its counterpart.
Work to directly stimulate the human brain with electricity started in the late 1800s, and by the 1930s electroconvulsive therapy (ECT) had been developed by Italian physicians Cerletti and Bini. ECT became widely used to treat mental illness, and ultimately overused, as it began to be seen as a panacea. This led to an ensuing backlash in the 1970s.
In 1980, Merton and Morton successfully used transcranial electrical stimulation (TES) to stimulate the motor cortex. However, this process was very uncomfortable, and it was after this that Anthony T. Barker would begin to search for an alternative to TES. Following this discovery, Anthony T. Barker began exploring use of magnetic fields to alter electrical signaling within the brain, and the first stable TMS devices were developed in 1985. They were originally intended as diagnostic and research devices, with evaluation of their therapeutic potential being a later development. The first TMS devices were approved by the FDA in October 2008.
TMS has shown potential with neurologic conditions such as Alzheimer's disease, amyotrophic lateral sclerosis, persistent vegetative states, epilepsy, stroke related disability, tinnitus, multiple sclerosis, schizophrenia, and traumatic brain injury.
With Parkinson's disease, early results suggest that low frequency stimulation may have an effect on medication associated dyskinesia, and that high frequency stimulation improves motor function. The most effective treatment protocols appear to involve high frequency stimulation of the motor cortex, particularly on the dominant side, but with more variable results for treatment of the dorsolateral prefrontal cortex. It is less effective than electroconvulsive therapy for motor symptoms, though both appear to have utility. Cerebellar stimulation has also shown potential for the treatment of levodopa associated dyskinesia.
In psychiatry, it has shown potential with anxiety disorders, including panic disorder and obsessive-compulsive disorder (OCD). The most promising areas to target for OCD appear to be the orbitofrontal cortex and the supplementary motor area. Older protocols that targeted the prefrontal dorsal cortex were less successful. It has also been studied with autism, substance abuse, addiction, and posttraumatic stress disorder (PTSD). For treatment-resistant major depressive disorder, HF-rTMS of the left dorsolateral prefrontal cortex (DLPFC) appears effective and low-frequency (LF) rTMS of the right DLPFC has probable efficacy.
TMS can also be used to map functional connectivity between the cerebellum and other areas of the brain.
Mimicking the physical discomfort of rTMS with placebo to discern its true effect is a challenging issue in research. It is difficult to establish a convincing placebo for TMS during controlled trials in conscious individuals due to the neck pain, headache and twitching in the scalp or upper face associated with the intervention. In addition, placebo manipulations can affect brain sugar metabolism and MEPs, which may confound results. This problem is exacerbated when using subjective measures of improvement. Placebo responses in trials of rTMS in major depression are negatively associated with refractoriness to treatment.
A 2011 review found that most studies did not report blinding. In the minority that did, participants in real and sham rTMS groups were not significantly different in their ability to correctly guess their therapy, though there was a trend for participants in the real group to more often guess correctly.
Animal model limitationsEdit
TMS research in animal studies is limited due to its early FDA approval for treament-resistant depression, limiting development of animal specific magnetic coils.
Society and cultureEdit
In 2008, the US Food and Drug Administration authorized the use of rTMS as a treatment for depression that has not improved with other measures. A number of deep TMS have received FDA 510k clearance to market for use in adults with treatment resistant major depressive disorders. The Royal Australian and New Zealand College of Psychiatrists has endorsed rTMS for treatment resistant major depressive disorder (MDD).
In the European Economic Area, various versions of Deep TMS H-coils have CE marking for Alzheimer's disease, autism, bipolar disorder, epilepsy  chronic pain major depressive disorder Parkinson's disease, posttraumatic stress disorder (PTSD), schizophrenia (negative symptoms) and to aid smoking cessation. One review found tentative benefit for cognitive enhancement in healthy people.
Commercial health insuranceEdit
In 2013, several commercial health insurance plans in the United States, including Anthem, Health Net, and Blue Cross Blue Shield of Nebraska and of Rhode Island, covered TMS for the treatment of depression for the first time. In contrast, UnitedHealthcare issued a medical policy for TMS in 2013 that stated there is insufficient evidence that the procedure is beneficial for health outcomes in patients with depression. UnitedHealthcare noted that methodological concerns raised about the scientific evidence studying TMS for depression include small sample size, lack of a validated sham comparison in randomized controlled studies, and variable uses of outcome measures. Other commercial insurance plans whose 2013 medical coverage policies stated that the role of TMS in the treatment of depression and other disorders had not been clearly established or remained investigational included Aetna, Cigna and Regence.
Policies for Medicare coverage vary among local jurisdictions within the Medicare system, and Medicare coverage for TMS has varied among jurisdictions and with time. For example:
- In early 2012 in New England, Medicare covered TMS for the first time in the United States. However, that jurisdiction later decided to end coverage after October, 2013.
- In August 2012, the jurisdiction covering Arkansas, Louisiana, Mississippi, Colorado, Texas, Oklahoma, and New Mexico determined that there was insufficient evidence to cover the treatment, but the same jurisdiction subsequently determined that Medicare would cover TMS for the treatment of depression after December 2013.
The United Kingdom's National Institute for Health and Care Excellence (NICE) issues guidance to the National Health Service (NHS) in England, Wales, Scotland and Northern Ireland. NICE guidance does not cover whether or not the NHS should fund a procedure. Local NHS bodies (primary care trusts and hospital trusts) make decisions about funding after considering the clinical effectiveness of the procedure and whether the procedure represents value for money for the NHS.
NICE evaluated TMS for severe depression (IPG 242) in 2007, and subsequently considered TMS for reassessment in January 2011 but did not change its evaluation. The Institute found that TMS is safe, but there is insufficient evidence for its efficacy.
In January 2014, NICE reported the results of an evaluation of TMS for treating and preventing migraine (IPG 477). NICE found that short-term TMS is safe but there is insufficient evidence to evaluate safety for long-term and frequent uses. It found that evidence on the efficacy of TMS for the treatment of migraine is limited in quantity, that evidence for the prevention of migraine is limited in both quality and quantity.
- Cortical stimulation mapping
- Cranial electrotherapy stimulation
- Electrical brain stimulation
- Electroconvulsive therapy
- Low field magnetic stimulation
- Non-invasive cerebellar stimulation
- Transcranial alternating current stimulation
- Transcranial direct-current stimulation
- Transcranial random noise stimulation
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|Wikimedia Commons has media related to Transcranial magnetic stimulation.|
- Stuttering Triggered by Transcranial Magnetic Stimulation (video)
- Wassermann EM, Epstein CM, Ziemann U, Walsh V, Paus T, Lisanby SH (2008). Oxford Handbook of Transcranial Stimulation (Oxford Handbooks). Oxford University Press, USA. ISBN 978-0-19-856892-6.