Deep brain stimulation does not treat Huntington's disease. It can reduce chorea — the continuous involuntary movements — and in carefully selected patients that reduction can meaningfully improve eating, sleeping, comfort, safety and the practical work of being cared for. It does not slow, halt or reverse the illness. It does not improve thinking, memory or behaviour. Anyone offering it as a treatment for Huntington's disease itself is describing something that does not exist.
At a glance
- Usual target
- Globus pallidus internus (GPi), both sides
- What can improve
- Chorea and other involuntary movements; with them, sleep, weight, comfort, falls and ease of care
- What does not improve
- Cognitive decline, behavioural and psychiatric symptoms, overall functional capacity, the course of the disease
- Evidence base
- Small published series and prospective pilot studies; no large randomised trial
- Honest framing
- A quality-of-life operation for a symptom, not a treatment for the disease
- Decided by
- A multidisciplinary discussion including neurology, neuropsychology, psychiatry and the family
The thing to be clear about before anything else
Families reach this page after a long search, and often after reading something that sounded like hope. So it is worth being blunt. Huntington's disease is a genetic, progressive illness. No operation changes that. Deep brain stimulation is a way of interfering with one particular circuit in the brain, and in Huntington's disease the circuit it can usefully reach is the one producing chorea.
That is not nothing. Severe chorea exhausts a person. It interferes with swallowing and causes weight loss. It prevents sleep, for the patient and for whoever is caring for them. It causes bruises, falls and fractures. Reducing it can give a person months or years of greater comfort and dignity. But it should be chosen for those reasons, understood clearly — not in the hope that it will hold the disease back, because it will not.
What the published experience shows
The evidence is thinner here than for Parkinson's disease or dystonia, and honesty about that is part of consent. A systematic review of the published literature to 2021 gathered twenty studies covering forty-two patients:
| Outcome | Published range |
|---|---|
| Chorea (UHDRS chorea subscore) | Reduced in every study, by 21.4% to 73.6% |
| Total UHDRS score | Improved by 5.4% to 34.5% |
| Overall motor score | Inconsistent across studies |
| Functional capacity and cognition | Not shown to improve; disease progression continues |
| Randomised controlled trials | None in the reviewed literature |
Bonomo R, Elia AE, Bonomo G, et al. Deep brain stimulation in Huntington's disease: a literature review. Neurol Sci 2021;42:4447–4457. doi:10.1007/s10072-021-05527-1
Who might reasonably be considered
- Chorea is the dominant problem — the thing that most limits comfort, eating, sleep and care.
- Medication for chorea has been tried properly and is either insufficient or is causing unacceptable sedation, depression or parkinsonism.
- Thinking and behaviour are relatively preserved, so that the patient can take part in programming and benefit from the change.
- The patient and family understand, and can repeat back, that this treats movements and not the disease.
- There is a care structure that can bring the patient back for programming over time.
Who should not be operated on
- Patients whose main burden is rigidity and slowness rather than chorea — including the akinetic-rigid (Westphal) form, in which pallidal stimulation may make matters worse.
- Patients with advanced dementia, in whom no improvement in movement will change daily life.
- Patients with unstable psychiatric illness or active suicidal thinking, which must be treated and stable first.
- Any family whose reason for wanting surgery is that they hope it will slow the disease. That reason is not a valid indication, and the honest answer is no.
A different condition that is often confused with this one
Myoclonus-dystonia — brief, lightning-like jerks combined with dystonic posturing, often beginning in childhood and often inherited — is a separate disorder, and pallidal stimulation works far better for it. A pooled analysis of seventy-one patients reported a mean improvement in myoclonus of about 80%, with more than nine in ten patients improving by at least half. If involuntary jerking rather than Huntington's disease is the question, the dystonia page is the right place to look.
Wang X, Yu X. Deep brain stimulation for myoclonus dystonia syndrome: a meta-analysis with individual patient data. Neurosurg Rev 2021;44:451–462. doi:10.1007/s10143-019-01233-x
Send records for an honest opinion
Frequently asked questions
Can deep brain stimulation stop or slow Huntington's disease?
No. It does not slow, halt or reverse the disease, and it does not improve cognition or behaviour. It can reduce chorea, which is a symptom.
What can realistically improve after surgery?
The involuntary movements, and the things that follow from them — eating and weight, sleep, pain and bruising from constant movement, falls, and the practical ease of being cared for. Published series report reductions in the chorea score ranging from about 21% to about 74%.
Is the evidence strong?
No, and that is stated plainly at consent. The published literature consists of small series and prospective pilot studies totalling a few dozen patients, without a large randomised trial. Chorea improves consistently; effects on overall motor function are inconsistent.
Is DBS suitable for the rigid form of Huntington's disease?
Generally not. Where rigidity and slowness dominate rather than chorea, pallidal stimulation is unlikely to help and may worsen those features.