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Bilateral nucleus basalis of Meynert deep brain stimulation for dementia with Lewy bodies: A randomised clinical trial

Lookup NU author(s): Ann McNichol, Professor John-Paul Taylor, Professor Lynn Rochester, Professor David Burn

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Abstract

© 2020 The AuthorsBackground: Dementia with Lewy bodies (DLB) is the second most common form of dementia. Current symptomatic treatment with medications remains inadequate. Deep brain stimulation of the nucleus basalis of Meynert (NBM DBS) has been proposed as a potential new treatment option in dementias. Objective: To assess the safety and tolerability of low frequency (20 Hz) NBM DBS in DLB patients and explore its potential effects on both clinical symptoms and functional connectivity in underlying cognitive networks. Methods: We conducted an exploratory randomised, double-blind, crossover trial of NBM DBS in six DLB patients recruited from two UK neuroscience centres. Patients were aged between 50 and 80 years, had mild-moderate dementia symptoms and were living with a carer-informant. Patients underwent image guided stereotactic implantation of bilateral DBS electrodes with the deepest contacts positioned in the Ch4i subsector of NBM. Patients were subsequently assigned to receive either active or sham stimulation for six weeks, followed by a two week washout period, then the opposite condition for six weeks. Safety and tolerability of both the surgery and stimulation were systematically evaluated throughout. Exploratory outcomes included the difference in scores on standardised measurements of cognitive, psychiatric and motor symptoms between the active and sham stimulation conditions, as well as differences in functional connectivity in discrete cognitive networks on resting state fMRI. Results: Surgery and stimulation were well tolerated by all six patients (five male, mean age 71.33 years). One serious adverse event occurred: one patient developed antibiotic-associated colitis, prolonging his hospital stay by two weeks. No consistent improvements were observed in exploratory clinical outcome measures, but the severity of neuropsychiatric symptoms reduced with NBM DBS in 3/5 patients. Active stimulation was associated with functional connectivity changes in both the default mode network and the frontoparietal network. Conclusion: Low frequency NBM DBS can be safely conducted in DLB patients. This should encourage further exploration of the possible effects of stimulation on neuropsychiatric symptoms and corresponding changes in functional connectivity in cognitive networks. Trial registration number: NCT02263937.


Publication metadata

Author(s): Gratwicke J, Zrinzo L, Kahan J, Peters A, Brechany U, McNichol A, Beigi M, Akram H, Hyam J, Oswal A, Day B, Mancini L, Thornton J, Yousry T, Crutch SJ, Taylor J-P, McKeith I, Rochester L, Schott JM, Limousin P, Burn D, Rossor MN, Hariz M, Jahanshahi M, Foltynie T

Publication type: Article

Publication status: Published

Journal: Brain Stimulation

Year: 2020

Volume: 13

Issue: 4

Pages: 1031-1039

Online publication date: 22/04/2020

Acceptance date: 15/04/2020

ISSN (print): 1935-861X

ISSN (electronic): 1876-4754

Publisher: Elsevier Inc.

URL: https://doi.org/10.1016/j.brs.2020.04.010

DOI: 10.1016/j.brs.2020.04.010

PubMed id: 32334074


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