Differentiated effects of deep brain stimulation and medication on somatosensory processing in Parkinson's disease

作者：Sridharan Kousik Sarathy^*; Hojlund Andreas; Johnsen Erik Li**jerg; Sunde Niels Aagaard; Johansen Lars Gottfried; Beniczky Syndor; Ostergaard Karen

来源：Clinical Neurophysiology, 2017, 128(7): 1327-1336.

DOI：10.1016/j.clinph.2017.04.014

• Deep brain stimulation
• Parkinson's disease
• Somatosensory processing
• Median nerve stimulation
• Magnetoencephalography
• Induced gamma augmentation

Objectives: Deep brain stimulation (DBS) and dopaminergic medication effectively alleviate the motor symptoms in Parkinson's disease (PD) patients, but their effects on the sensory symptoms of PD are still not well understood. To explore early somatosensory processing in PD, we recorded magnetoencephalography (MEG) from thirteen DBS-treated PD patients and ten healthy controls during median nerve stimulation.
Methods: PD patients were measured during DBS-treated, untreated and dopaminergic-medicated states. We focused on early cortical somatosensory processing as indexed by N20m, induced gamma augmentation (31-45 Hz and 55-100 Hz) and induced beta suppression (13-30 Hz). PD patients' motor symptoms were assessed by UPDRS-III.
Results: Using Bayesian statistics, we found positive evidence for differentiated effects of treatments on the induced gamma augmentation (31-45 Hz) with highest gamma in the dopaminergic-medicated state and lowest in the DBS-treated and untreated states. In contrast, UPDRS-III scores showed beneficial effects of both DBS and dopaminergic medication on the patients' motor symptoms. Furthermore, treatments did not affect the amplitude of N20m.
Conclusions: Our results suggest differentiated effects of DBS and dopaminergic medication on cortical somatosensory processing in PD patients despite consistent ameliorating effects of both treatments on PD motor symptoms.
Significance: The differentiated effect suggests differences in the effect mechanisms of the two treatments.

• 出版日期2017-7