Does accelerated TMS help treatment-resistant depression?
In this single-arm study of 25 patients, high-frequency accelerated left prefrontal rTMS improved depression symptoms in people whose depression had already failed at least one antidepressant. There was no control group, so this is an open trial rather than a randomized comparison. Key findings:
- Response rate 52% (13 of 25 patients)
- Remission rate 24% (6 of 25 patients)
- Six treatment days spread over three weeks, three 30-minute sessions per day
- Roughly 30% of MDD patients do not respond to conventional drug and psychosocial treatment
A study published in Annals of General Psychiatry examined accelerated repetitive transcranial magnetic stimulation (rTMS) for depressive disorder resistant to antidepressant medication. Roughly 30% of people with major depressive disorder do not respond to conventional pharmacological and psychosocial therapy, and accelerated rTMS protocols compress the delivery of stimulation into fewer visits, which the authors framed as a convenience advantage over conventional schedules that require daily sessions across multiple weeks.
Dr. Kumar’s Take
Accelerated rTMS is a practical evolution in neurostimulation for depression. Conventional rTMS requires daily sessions over multiple weeks, which is a real barrier for patients who work or who travel a distance to a treatment center. Stacking three sessions into a single day and running only six treatment days across three weeks is a schedule far more people can actually complete, and that matters more than it sounds, because a protocol nobody finishes helps nobody.
I read this study for what it is: 25 patients, no sham arm, no randomization, outcomes compared against their own baseline. A response rate of 52% in that design is encouraging but not proof that the acceleration itself is doing the work. I want to see this compared head to head against a standard daily schedule before I tell a patient the compressed course is equivalent. What I take from it is that the compressed schedule is feasible and that symptoms moved in the right direction over three weeks.
Study Snapshot
Twenty-five patients were enrolled, 12 female and 13 male, with a mean age of 36.88 ± 10.61 years. Inclusion required age between 18 and 60 and a history of at least one failed antidepressant treatment.
Treatment ran over six days scattered across three weeks. Each treatment day consisted of three 30-minute sessions, of 83, 83, and 84 trains, separated by 15-minute breaks. Stimulation was delivered at 120% of motor threshold at 10 Hz, in 2.4-second trains with a 15-second intertrain interval, over the left prefrontal cortex.
Outcomes were measured at baseline and at week three using the Hamilton Depression Rating Scale and the Clinical Global Impression scale, after the authors confirmed the normality of the data.
Results in Real Numbers
After three weeks, the Hamilton Depression Rating Scale and the Clinical Global Impression scale both showed substantial improvement from baseline.
The response rate was 52%, 13 of the 25 patients. The remission rate was 24%, 6 of the 25 patients.
The authors concluded that this work adds to the evidence that rTMS can treat treatment-resistant depression, and that a more convenient high-frequency accelerated protocol can improve symptoms in this group.
Who Benefits Most
The population studied here was adults aged 18 to 60 with depression that had failed at least one adequate antidepressant trial. That matches the FDA indication rTMS received in 2008: major depressive disorder in adults who have not achieved satisfactory improvement from at least one prior antidepressant at or above the minimal effective dose and duration during the current episode.
The compressed schedule is aimed squarely at the access problem. Conventional rTMS requires daily sessions over multiple weeks, which can restrict access for employed patients and for those who must travel a significant distance to a treatment facility. Six treatment days across three weeks removes much of that burden.
Safety, Limits, and Caveats
rTMS is generally well tolerated, with a very low incidence of treatment-emergent adverse effects.
The limits of this particular study are worth stating plainly. Twenty-five patients is a small sample. There was no sham or comparison arm, so improvement cannot be separated from the natural course of the illness, from concurrent treatment, or from expectation effects. Outcomes were assessed at three weeks, so this study says nothing about how long the benefit lasts. Just under half the patients did not meet response criteria, and three quarters did not reach remission.
Practical Takeaways
- Accelerated rTMS is a reasonable option to discuss if your depression has not responded to at least one adequate antidepressant trial
- The protocol tested here was six treatment days over three weeks, with three 30-minute sessions per day separated by 15-minute breaks
- About half the patients in this study responded and about a quarter remitted, so a meaningful number of people will not improve on this course
- The main argument for the compressed schedule is feasibility for people who cannot attend daily sessions for weeks
- This was an uncontrolled study, so treat the numbers as promising rather than as a settled comparison against standard rTMS
What This Means for Treatment-Resistant Depression
This study adds to the accumulating evidence that rTMS can treat depression that has resisted medication, and it shows that a high-frequency accelerated schedule can improve symptoms while asking far less of the patient’s calendar. Focal stimulation of the dorsolateral prefrontal cortex for depression has consistently produced positive outcomes across several meta-analyses, and accelerated protocols are an attempt to deliver that same treatment in a form more people can complete.
The broader direction of the field is toward condensing pulses into shorter time windows, including high-frequency protocols at 10 to 20 Hz and rapid patterns such as intermittent theta burst stimulation. Having more than one protocol option available makes it possible to match the schedule to the patient’s circumstances.
Related Studies and Research
Episode 31: Depression Explained, The Biology Behind the Darkness
Episode 32: Depression Recovery Roadmap: A Step-by-Step, Evidence-Based Plan
FAQs
How is accelerated rTMS different from regular TMS?
Conventional rTMS typically requires daily sessions over multiple weeks. The accelerated protocol in this study delivered three 30-minute sessions in a single day, on six treatment days spread across three weeks.
Is accelerated rTMS safe?
rTMS is generally well tolerated, with a very low incidence of treatment-emergent adverse effects.
Who is a good candidate for accelerated rTMS?
This study enrolled adults aged 18 to 60 with a history of at least one failed antidepressant treatment. Medical evaluation is required before starting any TMS protocol.
Bottom Line
In 25 patients whose depression had failed at least one antidepressant, six days of high-frequency accelerated left prefrontal rTMS across three weeks produced a 52% response rate and a 24% remission rate, with substantial improvement on the Hamilton Depression Rating Scale and the Clinical Global Impression scale. The study was uncontrolled, so the schedule looks feasible and the direction is encouraging, but a randomized comparison against standard rTMS is still needed.
