On Tuesday, when I went to my psychiatrist’s office, I noticed a large display of brochures for Transcranial Magnetic Stimulation (TMS). My husband, who was with me, asked about it, so I told him what little I knew about what it is and what it’s supposed to do. But I realized that I’ve never investigated it thoroughly. When I was considering ECT, TMS was rather new and not an option offered to me. Then a change in medication alleviated my treatment-resistant depression at last. When we got home from my appointment, I thought I’d look into TMS further.
What Is TMS?
TMS, sometimes called rTMS (for repetitive TMS), is a non-invasive treatment for long-term depression (and perhaps a few other conditions such as OCD, PTSD, migraines, epilepsy, and even nicotine addiction). It differs from vagus nerve stimulation and deep brain stimulation because it doesn’t require surgery or cutting the skin.
TMS involves placing electromagnetic coils on the patient’s scalp and moving them around until they have the desired effect. The procedure targets areas of the brain that show decreased activity in patients with depression and is thought to activate those areas.
Calibrating the magnetic coils and determining their placement happens at the initial appointment. For subsequent appointments, the coils are simply placed at the effective points already determined. TMS only affects areas of the brain that are close to the surface. Sessions are required five days per week for several weeks. Each session lasts approximately 20 minutes or sometimes less.
TMS doesn’t require anesthesia and can be performed as an outpatient procedure in a provider’s office or a clinic. You don’t have to have someone to drive you home afterward, though you may want to for your first session until you know how TMS will affect you. Symptom relief can occur after several weeks of treatment.
TMS is FDA-approved, and most insurance plans cover it if you meet certain criteria, like having no effect from several antidepressant medications. Many also cover repeated treatments if the effects wear off. Deep TMS, in which the electromagnetic pulse reaches deeper into the brain, is FDA-approved for OCD and nicotine addiction when standard treatments have failed, but is off-label for other conditions.
Outcomes
Approximately one-third of people who undergo TMS experience full remission of their depression. Fifty to sixty percent report improvement of their symptoms. Most patients, however, experience remission lasting for months after the treatment, with positive outcomes averaging somewhat more than a year. But the results are not permanent; there is a high rate of recurrence. Patients can engage in multiple rounds of treatment after the effects wear off. For patients who don’t respond to TMS, ECT is often considered.
Side Effects
One of the first things I learned about TMS was that I wouldn’t have been a good candidate for it. My illness is bipolar disorder, which has a mania component, and one of the possible side effects of TMS is mania. And I might not qualify for it now, as I have metal implants in my body, which is sometimes a contraindication. Although TMS is sometimes recommended for bipolar depression, I’m not sure I would like to risk it. I would have talked it over with my psychiatrist.
TMS has other potential side effects as well, though not the memory loss that can accompany ECT. In addition to possible mania, TMS carries the risk of seizures, as well as hearing loss if the ears aren’t properly protected. More common side effects include headaches, scalp pain, lightheadedness, and twitching facial muscles.
Pros and Cons
The relatively high success rate is certainly a selling point. Even better outcomes are expected for TMS guided by fMRI for more precise placement of the magnetic coils. Although seizures can occur, the rate is approximately 1 in 10,000 sessions. In addition to alleviating depression, TMS may also reduce suicidal ideation. If you’re taking medications for depression, they will not interact negatively with TMS. Many clinics offer the procedure.
On the other hand, TMS is not for everyone. The treatments can be time-consuming. And some practitioners don’t treat patients under the age of 18 or over 65. If you’re not insured, the procedure can cost $6,000 to $15,000. Advanced equipment and the costs of added therapies can boost the total to $30,000.
Only you and your doctor can determine whether TMS is worth trying. But if you have longstanding, treatment-resistant depression, you may want to explore the possibility.











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