Adaptive Deep Brain Stimulation in Advanced Parkinson's Disease: A Narrative Review of Motor Fluctuation, Speech and the Caregiver's Experience
DOI:
https://doi.org/10.5281/zenodo.22227720Keywords:
Parkinson's Disease, Adaptive Deep Brain Stimulation, Closed-Loop Neuromodulation, Motor Fluctuation, Caregiver BurdenAbstract
Conventional deep brain stimulation runs continuously at settings chosen in clinic, while the disease it treats fluctuates hour by
hour. Adaptive stimulation reads a brain signal and adjusts itself. The idea is two decades old; the randomised evidence for it
currently rests on a handful of patients.
Objectives: To review the published evidence on adaptive deep brain stimulation in advanced Parkinson's disease: what it
changes in motor fluctuation, what is known about its effect on speech, how much stimulation it delivers, and how large the
evidence base actually is.
Material and Methods: Narrative review of randomised trials, crossover studies, physiological studies and society-level reviews
indexed in PubMed and the major neurology, movement disorder and neurosurgery journals. No new patient data were
generated; every estimate quoted is one published by the original investigators.
Results: In the founding crossover study of 8 patients, motor scores improved by 66.2 per cent unblinded and 49.7 per cent
blinded against the unstimulated state, compared with 54.3 and 30.5 per cent on conventional stimulation; the advantage of
adaptive stimulation was 28.7 per cent (p = 0.03) and 27.0 per cent (p = 0.005) respectively, achieved with 56 per cent less
stimulation time. A later blinded randomised crossover trial in 4 patients using stimulation-entrained gamma oscillations
reported improved motor symptoms and quality of life over conventional stimulation. Acute testing found fewer speech side
effects with adaptive than conventional stimulation.
Conclusion: The physiological rationale is sound and the reported effects are consistent, but the entire randomised literature
comparing adaptive with conventional stimulation involves fewer patients than a single arm of the trials that established
conventional stimulation. This is a promising technology at an early stage, and should be described as such.
Abbreviations: aDBS – Adaptive Deep Brain Stimulation, cDBS – Conventional Deep Brain Stimulation, DBS – Deep Brain
Stimulation, LFP – Local Field Potential, PD – Parkinson's Disease, STN – Subthalamic Nucleus, UPDRS – Unified Parkinson's
Disease Rating Scale.
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