Neural stimulation systems for the control of refractory epilepsy: a review.
Matthew D Bigelow, Abbas Z Kouzani
PMID 31665058WHAT IT FOUND
Closed-loop stimulation for refractory epilepsy has not clearly increased the number of people with more than 50% fewer seizures compared with open-loop stimulation.
Key findings
01Closed-loop neural stimulation has not clearly increased the number of people with more than 50% fewer seizures compared with open-loop stimulation.
02Thalamic stimulation reports responder rates and quality-of-life improvement, but patients also used various anti-epileptic drugs, so the contribution of stimulation alone cannot be separated.
03Several seizure prediction and detection methods were tested on artefact-free data or outside normal everyday movement, so they are not yet validated for real-world closed-loop use.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
This is a review of published studies, not a new trial, so it cannot establish the effect of any one system in a new patient group. Many cited seizure detection and prediction studies used artefact-free data, controlled settings, small samples, animals or healthy volunteers, so real-world accuracy is unknown. The review says long-term invasive stimulation studies had methodological problems. Closed-loop vagus nerve stimulation results were mixed, and thresholds for cardiac detection may be difficult to set for individual patients. Non-invasive stimulation methods such as transcranial magnetic stimulation, transcranial direct current stimulation, transcutaneous vagus nerve stimulation and external trigeminal nerve stimulation have mixed results and limited controlled trials. Commercial seizure warning devices may lack valid scientific data or apply only to certain epilepsy types.
The easy way to misread this
Do not read the high accuracy or seizure reduction numbers as proof that these systems work for every patient with refractory epilepsy. Many were tested in small, controlled or artefact-free studies, and the review says closed-loop vagus nerve stimulation has not clearly improved responder rates over open-loop vagus nerve stimulation.