Volume 94, Issue 2 pp. 271-284
Research Article

Connectivity Profile for Subthalamic Nucleus Deep Brain Stimulation in Early Stage Parkinson Disease

Mallory L. Hacker PhD, MSCI

Corresponding Author

Mallory L. Hacker PhD, MSCI

Department of Neurology, Vanderbilt University Medical Center, Nashville, TN, USA

Address correspondence to Dr Hacker, Department of Neurology, Department of Physical Medicine and Rehabilitation, Vanderbilt University Medical Center, 440 Crystal Terrace, 3319 West End Ave, Nashville, TN 37203. E-mail: [email protected]

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Nanditha Rajamani MSc

Nanditha Rajamani MSc

Movement Disorder and Neuromodulation Unit, Department of Neurology, Department of Neurology, Charité–Universitätsmedizin Berlin, corporate member of Free University of Berlin and Humboldt University of Berlin, Berlin, Germany

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Clemens Neudorfer MD

Clemens Neudorfer MD

Center for Brain Circuit Therapeutics, Department of Neurology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA

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Barbara Hollunder MSc

Barbara Hollunder MSc

Movement Disorder and Neuromodulation Unit, Department of Neurology, Department of Neurology, Charité–Universitätsmedizin Berlin, corporate member of Free University of Berlin and Humboldt University of Berlin, Berlin, Germany

Einstein Center for Neurosciences Berlin, Charité–Universitätsmedizin Berlin, Berlin, Germany

Berlin School of Mind and Brain, Humboldt University of Berlin, Berlin, Germany

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Simon Oxenford

Simon Oxenford

Movement Disorder and Neuromodulation Unit, Department of Neurology, Department of Neurology, Charité–Universitätsmedizin Berlin, corporate member of Free University of Berlin and Humboldt University of Berlin, Berlin, Germany

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Ningfei Li PhD

Ningfei Li PhD

Movement Disorder and Neuromodulation Unit, Department of Neurology, Department of Neurology, Charité–Universitätsmedizin Berlin, corporate member of Free University of Berlin and Humboldt University of Berlin, Berlin, Germany

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Alice L. Sternberg ScM

Alice L. Sternberg ScM

Department of Epidemiology, Johns Hopkins University, Baltimore, MD, USA

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Thomas L. Davis MD

Thomas L. Davis MD

Department of Neurology, Vanderbilt University Medical Center, Nashville, TN, USA

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Peter E. Konrad MD, PhD

Peter E. Konrad MD, PhD

Department of Neurosurgery, West Virginia University, Morgantown, WV, USA

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Andreas Horn MD, PhD

Andreas Horn MD, PhD

Movement Disorder and Neuromodulation Unit, Department of Neurology, Department of Neurology, Charité–Universitätsmedizin Berlin, corporate member of Free University of Berlin and Humboldt University of Berlin, Berlin, Germany

Center for Brain Circuit Therapeutics, Department of Neurology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA

Department of Neurosurgery and Center for Neurotechnology and Neurorecovery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA

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David Charles MD

David Charles MD

Department of Neurology, Vanderbilt University Medical Center, Nashville, TN, USA

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First published: 13 May 2023
Citations: 2

Andreas Horn and David Charles contributed equally to this work.

Abstract

Objective

This study was undertaken to describe relationships between electrode localization and motor outcomes from the subthalamic nucleus (STN) deep brain stimulation (DBS) in early stage Parkinson disease (PD) pilot clinical trial.

Methods

To determine anatomical and network correlates associated with motor outcomes for subjects randomized to early DBS (n = 14), voxelwise sweet spot mapping and structural connectivity analyses were carried out using outcomes of motor progression (Unified Parkinson Disease Rating Scale Part III [UPDRS-III] 7-day OFF scores [∆baseline➔24 months, MedOFF/StimOFF]) and symptomatic motor improvement (UPDRS-III ON scores [%∆baseline➔24 months, MedON/StimON]).

Results

Sweet spot mapping revealed a location associated with slower motor progression in the dorsolateral STN (anterior/posterior commissure coordinates: 11.07 ± 0.82mm lateral, 1.83 ± 0.61mm posterior, 3.53 ± 0.38mm inferior to the midcommissural point; Montreal Neurological Institute coordinates: +11.25, −13.56, −7.44mm). Modulating fiber tracts from supplementary motor area (SMA) and primary motor cortex (M1) to the STN correlated with slower motor progression across STN DBS subjects, whereas fiber tracts originating from pre-SMA and cerebellum were negatively associated with motor progression. Robustness of the fiber tract model was demonstrated in leave-one-patient-out (R = 0.56, p = 0.02), 5-fold (R = 0.50, p = 0.03), and 10-fold (R = 0.53, p = 0.03) cross-validation paradigms. The sweet spot and fiber tracts associated with motor progression revealed strong similarities to symptomatic motor improvement sweet spot and connectivity in this early stage PD cohort.

Interpretation

These results suggest that stimulating the dorsolateral region of the STN receiving input from M1 and SMA (but not pre-SMA) is associated with slower motor progression across subjects receiving STN DBS in early stage PD. This finding is hypothesis-generating and must be prospectively tested in a larger study. ANN NEUROL 2023;94:271–284

Potential Conflicts of Interest

M.L.H. and D.C. are shareholders of Arena Therapeutics, a company focused on advancing research of DBS for the treatment of patients recently diagnosed with PD. P.E.K. has equity ownership in Neurotargeting, which has developed a system that facilitates the operative phases of DBS procedures. A.H. has received lecturing fees from Boston Scientific, which manufactures DBS systems. The other authors have nothing to report.

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