Common and unique responses to dopamine agonist therapy and deep brain stimulation in Parkinson's disease: an H(2)(15)O PET study.

Abstract:

BACKGROUND:Dopamine agonist therapy and deep brain stimulation (DBS) of the subthalamic nucleus (STN) are antiparkinsonian treatments that act on a different part of the basal ganglia-thalamocortical motor circuitry, yet produce similar symptomatic improvements. OBJECTIVE/HYPOTHESIS:The purpose of this study was to identify common and unique brain network features of these standard treatments. METHODS:We analyzed images produced by H(2)(15)O positron emission tomography (PET) of patients with Parkinson's disease (PD) at rest. Nine patients were scanned before and after injection of apomorphine, and 11 patients were scanned while bilateral stimulators were off and while they were on. RESULTS:Both treatments produced common deactivations of the neocortical sensorimotor areas, including the supplementary motor area, precentral gyrus, and postcentral gyrus, and in subcortical structures, including the putamen and cerebellum. We observed concomitant activations of the superior parietal lobule and the midbrain in the region of the substantia nigra/STN. We also detected unique, treatment-specific changes with possible motor-related consequences in the basal ganglia, thalamus, neocortical sensorimotor cortex, and posterolateral cerebellum. Unique changes in nonmotor regions may reflect treatment-specific effects on verbal fluency and limbic functions. CONCLUSIONS:Many of the common effects of these treatments are consistent with the standard pathophysiologic model of PD. However, the common effects in the cerebellum are not readily explained by the model. Consistent deactivation of the cerebellum is interesting in light of recent reports of synaptic pathways directly connecting the cerebellum and basal ganglia, and may warrant further consideration for incorporation into the model.

journal_name

Brain Stimul

journal_title

Brain stimulation

authors

Bradberry TJ,Metman LV,Contreras-Vidal JL,van den Munckhof P,Hosey LA,Thompson JL,Schulz GM,Lenz F,Pahwa R,Lyons KE,Braun AR

doi

10.1016/j.brs.2011.09.002

subject

Has Abstract

pub_date

2012-10-01 00:00:00

pages

605-15

issue

4

eissn

1935-861X

issn

1876-4754

pii

S1935-861X(11)00126-4

journal_volume

5

pub_type

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