Neuronal activity in the globus pallidus of multiple system atrophy patients.
Identifieur interne : 001297 ( PubMed/Checkpoint ); précédent : 001296; suivant : 001298Neuronal activity in the globus pallidus of multiple system atrophy patients.
Auteurs : Luiz C M. Pereira [Canada] ; Vanessa N. Palter ; Anthony E. Lang ; William D. Hutchison ; Andres M. Lozano ; Jonathan O. DostrovskySource :
- Movement disorders : official journal of the Movement Disorder Society [ 0885-3185 ] ; 2004.
English descriptors
- KwdEn :
- Adult, Aged, Anticonvulsants (therapeutic use), Antiparkinson Agents (therapeutic use), Female, Globus Pallidus (physiopathology), Globus Pallidus (surgery), Humans, Levodopa (therapeutic use), Male, Microelectrodes, Middle Aged, Multiple System Atrophy (physiopathology), Multiple System Atrophy (surgery), Neurosurgical Procedures (instrumentation), Parkinson Disease (drug therapy), Parkinson Disease (physiopathology), Parkinson Disease (surgery).
- MESH :
- chemical , therapeutic use : Anticonvulsants, Antiparkinson Agents, Levodopa.
- drug therapy : Parkinson Disease.
- instrumentation : Neurosurgical Procedures.
- physiopathology : Globus Pallidus, Multiple System Atrophy, Parkinson Disease.
- surgery : Globus Pallidus, Multiple System Atrophy, Parkinson Disease.
- Adult, Aged, Female, Humans, Male, Microelectrodes, Middle Aged.
Abstract
The pathophysiological changes in neural activity that characterize multiple system atrophy (MSA) are largely unknown. We recorded the activity of pallidal neurons in 3 patients with clinical and radiological features of MSA who underwent unilateral microelectrode-guided pallidotomy for disabling parkinsonism. Findings in these patients were compared with 4 control patients with a clinical diagnosis of Parkinson's disease (PD). The position, firing rates, and firing patterns of single neurons in the pallidal complex were analyzed in both MSA and PD patients. The mean spontaneous firing rate of neurons in the internal segment of the globus pallidus internus (GPii) was significantly lower in MSA than in PD patients. There were no significant differences between MSA and PD patients, however, in firing rates of neurons in the external globus pallidus (GPe) or in the external segment of GPi (GPie). In addition, no significant differences in firing pattern were found between MSA and PD patients. In conclusion, this study has shown that firing rates of neurons in GPii but not in GPie and GPe are different in MSA patients compared with that in PD patients, a finding that may reflect the poor clinical results of pallidotomy reported in patients with MSA.
DOI: 10.1002/mds.20236
PubMed: 15390066
Affiliations:
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pubmed:15390066Le document en format XML
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<front><div type="abstract" xml:lang="en">The pathophysiological changes in neural activity that characterize multiple system atrophy (MSA) are largely unknown. We recorded the activity of pallidal neurons in 3 patients with clinical and radiological features of MSA who underwent unilateral microelectrode-guided pallidotomy for disabling parkinsonism. Findings in these patients were compared with 4 control patients with a clinical diagnosis of Parkinson's disease (PD). The position, firing rates, and firing patterns of single neurons in the pallidal complex were analyzed in both MSA and PD patients. The mean spontaneous firing rate of neurons in the internal segment of the globus pallidus internus (GPii) was significantly lower in MSA than in PD patients. There were no significant differences between MSA and PD patients, however, in firing rates of neurons in the external globus pallidus (GPe) or in the external segment of GPi (GPie). In addition, no significant differences in firing pattern were found between MSA and PD patients. In conclusion, this study has shown that firing rates of neurons in GPii but not in GPie and GPe are different in MSA patients compared with that in PD patients, a finding that may reflect the poor clinical results of pallidotomy reported in patients with MSA.</div>
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