Summary
Dr. Owen Muir delivers a focused explainer on accelerated TMS, using vivid analogies to make the neuroscience accessible. He compares TMS to a piano tuner getting an orchestra back in sync, and explains that the mechanism of change is the same as learning something new through spaced repetition. The episode covers the SAINT protocol in detail, including fMRI-guided targeting of the subgenual cingulate, theta burst stimulation patterns at 50 Hz, and the eight-and-a-half-minute treatment sessions with 50-minute intervals. Muir presents data showing 65-79% remission rates with durability of 12-18 months, and explains how TMS can also treat OCD using different brain targets.
Key Points
- Accelerated TMS uses spaced learning theory: eight-and-a-half-minute sessions every hour teach the brain to not be depressed
- The theta burst pattern at 50 Hz matches the brain's natural rhythm, optimizing neuroplasticity
- SAINT protocol uses fMRI to find the personalized target based on the subgenual cingulate connection
- Remission rates range from 65% (worst interpretation) to 79% (best interpretation) of the data
- Effects of accelerated TMS for depression last 12-18 months on average, with some needing tune-ups
- Depression is a functional problem like an orchestra playing out of tune, not a structural defect
- OCD can also be treated with TMS using a different brain target and the same theta burst pattern
- Some patients continue twice-weekly sessions for up to 12 weeks after the accelerated course for fuller remission
Key Moments
How accelerated TMS works like spaced repetition learning
Dr. Muir explains the core principle behind accelerated TMS using the analogy of flashcard-based learning, where eight-and-a-half-minute stimulation sessions every hour with 50-minute breaks mirror optimal memory consolidation patterns.
"With a flashcard, you look once, and if you're studying efficiently, you look again in an hour, and then maybe again in another hour. And with that spacing, you reinforce what you learned. And so for the same reason, with accelerated transcranial magnetic stimulation treatment, we stimulate the brain for eight and a half minutes once an hour, with 50 minutes in between."
Remission rates of 65-79% for depression
Dr. Muir presents the outcome data for accelerated TMS, showing even the most conservative interpretation achieves 65% depression remission, with the best interpretation reaching 79%.
"The worst interpretation of the data is 65% of people having their depression be over, and the best is 79% will have their depression be over. Done. The side effect profile for transcranial magnetic stimulation is mild."
Theta burst stimulation matches the brain's natural rhythm
The episode explains the specific stimulation pattern used in accelerated TMS, with triplets at 50 Hz cycling five times per second matching the brain's natural theta rhythm for optimal neuroplasticity.
"The treatment is repeated pulses of energy, and in theta burst stimulation, that pattern is triplets. That pattern at 50 Hz cycling five times every second with pauses in between, it turns out that's the same natural rhythm of the brain."
Durability of accelerated TMS effects
Dr. Muir addresses the key question of how long accelerated TMS results last, reporting average durability of 12-18 months with the caveat that some people may need periodic tune-ups.
"By the end of a course of accelerated TMS for depression, 79% of people have remission of their depression symptoms. A fair question, how long is this going to last? And what we understand is the durability is personal, but on average, it's between 12 and 18 months."
