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Transcranial Magnetic Stimulation (TMS)

What is Transcranial Magnetic Stimulation?

Transcranial magnetic stimulation (TMS) is a non-invasive treatment for certain mental health conditions, such as major depression and obsessive-compulsive disorder. It uses magnetic fields to stimulate specific areas of the brain without requiring incisions or general anesthesia.

During treatment, the patient sits in a chair, and the TMS device is positioned over the scalp near the targeted area of the brain. The device produces a series of brief, pulsed magnetic fields that stimulate the neurons in the targeted area. The patient may feel tapping on the scalp during treatment, but TMS is generally painless.

There are different types of TMS, including repetitive TMS (rTMS) and deep TMS (dTMS), and the specific type used depends on the treated condition and targeted brain region. TMS has been explored as a potential treatment for various other conditions, such as anxiety disorders, post-traumatic stress disorder (PTSD), and addiction.

TMS is believed to work by modulating the activity of certain brain regions involved in mood regulation, and it may help to increase the release of certain neurotransmitters, such as serotonin, which are involved in mood regulation. In obsessive-compulsive disorder, TMS may help to reduce the severity of obsessive thoughts and compulsive behaviors.

Robert Sapolsky, a Stanford researcher and professor, had the following to say about TMS:

"Transcranial stimulation refers to the process of electrically or magnetically stimulating neural circuits with devices that are placed on the outside of the skull. Transcranial stimulation has mostly been used to treat major depressive disorder, but seems to also be helpful for generalized anxiety disorder, post-traumatic stress disorder, obsessive-compulsive disorder, Parkinson’s disease, stroke rehabilitation, schizophrenia, chronic pain, nicotine addiction, and multiple sclerosis. Furthermore, a recent meta-analysis suggests that transcranial stimulation is not only a treatment for psychiatric disorders, but may also be used to improve cognition (i.e. working memory, long-term memory, attention, executive control, and fluid intelligence) in healthy young and older adults. More specifically, researchers looked at a total of 102 studies, which included almost 2900 participants all together, and found that those who received transcranial alternate current stimulation performed significantly better in many cognitive domains than those who did not receive it. However, the duration of these improvements was not determined. It may be that transcranial stimulation only has a transient effect, and thus further research is necessary to determine its effectiveness as a tool for sustained cognitive enhancement."

Is TMS Safe?

If you're considering transcranial magnetic stimulation (TMS) as a treatment option, it's important to know that it is generally safe and well-tolerated. This non-invasive procedure does not require surgery or anesthesia and is known to have a good safety profile.

The most common side effects of TMS include mild scalp discomfort and headache. While rare, other side effects like dizziness, lightheadedness, facial muscle twitching, and tingling may occur but usually go away on their own shortly after treatment.

In even rarer cases, TMS may cause more serious side effects such as seizures or mania, but these are usually related to high-intensity or prolonged stimulation. However, overall, TMS is considered to be a safe and well-tolerated treatment for certain mental health conditions.

How do you get Access to TMS?

To get transcranial magnetic stimulation (TMS) treatment, you'll usually need a referral from a healthcare provider like a psychiatrist or psychologist. They'll look at your medical history and do a physical exam to see if TMS could be a good treatment for you.

If it is, your healthcare provider will give you information about how the procedure works, and talk to you about the potential risks and benefits. Before you start treatment, you'll need to sign a form to show that you understand what's involved.

You'll usually get TMS as an outpatient at a TMS clinic or your healthcare provider's office. Each treatment session lasts about 20-40 minutes and you'll have them 5 days a week for 4-6 weeks.

Who is the Ideal Candidate for TMS?

If you're considering transcranial magnetic stimulation (TMS), it's important to note that whether or not it's a suitable treatment option for you will depend on your specific condition and medical history. TMS is most commonly used to treat major depression and obsessive-compulsive disorder, and it may be a good option if you have not had success with other treatments like medication or therapy.

TMS is often considered for individuals who are unable to take certain medications or are experiencing side effects from them. It may also be a safe option for pregnant or nursing individuals since it doesn't involve medications and does not pose a risk to the fetus or nursing infant.

However, some factors or medical conditions may make TMS unsuitable as a treatment option. For instance, TMS is generally not recommended for individuals who have a history of seizures or epilepsy since it may increase the risk of seizures. Also, people with certain metallic implants, such as a pacemaker or cochlear implant, may not be suitable for TMS treatment, as the magnetic field generated by the device may interfere with the functioning of these implants.

What Scientific Evidence is There for TMS?

Transcranial magnetic stimulation (TMS) has been extensively studied in scientific research over the past few decades. Studies have shown that TMS is a safe and effective treatment for major depression and obsessive-compulsive disorder. TMS has also been studied as a treatment for conditions such as anxiety disorders, post-traumatic stress disorder (PTSD), and addiction. While some studies have shown promising results, more research is needed to fully understand TMS's effectiveness for these conditions.

Research has also been conducted to better understand how TMS works. Some studies have explored the effects of TMS on brain activity and neurotransmitter release, shedding light on how TMS may modulate brain function. The FDA has approved TMS for the treatment of major depression and obsessive-compulsive disorder, but more research is needed to determine the optimal use of TMS in clinical practice. Overall, scientific research suggests that TMS is a safe and effective treatment option for certain mental health conditions.

Here are a few sources that support the efficacy of TMS:

  1. Berlim MT, Van den Eynde F, Daskalakis ZJ. Clinically meaningful efficacy and acceptability of low-frequency repetitive transcranial magnetic stimulation (rTMS) for treating primary major depression: This meta-analysis found that low-frequency rTMS was effective in reducing symptoms of major depression, with response rates of around 30%. Treatment with low-frequency rTMS was also well-tolerated by patients.
  2. Brunoni AR, et al. Clinical efficacy and safety of transcranial direct current stimulation for major depression: This meta-analysis found that transcranial direct current stimulation (tDCS) was effective in reducing symptoms of major depression, with a moderate effect size. The analysis included 10 randomized, sham-controlled trials with a total of 374 patients.
  3. Lam RW, Chan P, Wilkins-Ho M, et al. Repetitive transcranial magnetic stimulation for treatment-resistant depression: This meta-analysis found that rTMS was effective in reducing symptoms of treatment-resistant depression, with response rates of around 29%. The analysis included 12 randomized, sham-controlled trials with a total of 347 patients. The authors noted that the quality of the evidence was moderate to low, indicating the need for further research.

A recent study attempted to look at the effect of TMS over time. They found that patients improved quickly at first, and then more slowly as time went on. They collected data from 97 patients and compared the results to other studies. By doing so, they found that an exponential decay model worked better than a straight line to describe the recovery process. This means that TMS works in a way that's not a steady, straight improvement. This is beneficial to understand, both for researchers and for patients. Below is the decay that they plotted from the study:

figure 1
Exponential decay model of the treatment response to transcranial magnetic stimulation (TMS). Change in depression ratings during TMS are expressed as a function of time (t), with A representing the total magnitude of symptom improvement, B representing the time constant of treatment response, and C representing symptom ratings at the end of treatment.

Who are the Prominent People in TMS?

Some of the pioneers in this field include:

  1. Anthony Barker developed the first practical TMS device in the 1980s. His work has paved the way for using TMS as a non-invasive treatment for neurological and psychiatric disorders.
  2. Alvaro Pascual-Leone is a Spanish-American neurophysiologist and psychiatrist who has conducted numerous clinical trials on TMS. He has made significant contributions to understanding the mechanisms underlying TMS and its use in the treatment of various mental health conditions. He has published extensively on the topic.
  3. Mark George is an American psychiatrist and neurobiologist who has conducted numerous clinical trials on TMS. He has made significant contributions to understanding the mechanisms underlying TMS and its use in the treatment of mental health conditions, particularly depression. He has published extensively on the topic.
  4. John P. O'Reardon is an American psychiatrist who has conducted numerous clinical trials on TMS. He has made significant contributions to understanding the mechanisms underlying TMS and its use in the treatment of mental health conditions, particularly depression. He has published extensively on the topic.

What are the Limitations or Criticisms of TMS?

If you’re considering TMS, it's important to be aware of some criticisms of the treatment. These include the fact that TMS may not work for everyone and that the benefits of treatment may be short-lived. 

Additionally, TMS can be expensive and may not be covered by insurance in all cases, which could make it challenging for some individuals to access the treatment. 

Another issue is that TMS may not be available in all areas, particularly rural ones. Furthermore, while TMS has been studied for several decades, there is still a lack of long-term data on its safety and effectiveness. 

Finally, there is no standardization in the way that TMS is administered, and there is no consensus on the optimal parameters for treatment, making it difficult to compare the results of different studies and determine the most effective treatment approach. However, studies are underway to determine what the optimal parameters may be.

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