Relationship of lesion location to clinical outcome following microelectrode-guided pallidotomy for Parkinson's disease
Identifieur interne : 001355 ( Istex/Checkpoint ); précédent : 001354; suivant : 001356Relationship of lesion location to clinical outcome following microelectrode-guided pallidotomy for Parkinson's disease
Auteurs : Robert E. Gross ; Wendy J. Lombardi ; Anthony E. Lang ; Jan Duff ; William D. Hutchison ; Jean A. Saint-Cyr [Canada] ; Ronald R. Tasker ; Andres M. LozanoSource :
- Brain [ 0006-8950 ] ; 1999-03.
English descriptors
- KwdEn :
Abstract
The purpose of this study was to examine the relationship between lesion location and clinical outcome following globus pallidus internus (GPi) pallidotomy for advanced Parkinson's disease. Thirty-three patients were prospectively studied with extensive neurological examinations before and at 6 and 12 months following microelectrode-guided pallidotomy. Lesion location was characterized using volumetric MRI. The position of lesions within the posteroventral region of the GPi was measured, from anteromedial to posterolateral along an axis parallel to the internal capsule. To relate lesion position to clinical outcome, hierarchical multiple regression analysis was used. The variance in outcome measures that was related to preoperative scores and lesion volume was first calculated, and then the remaining variance attributable to lesion location was determined. Lesion location along the anteromedial-to-posterolateral axis within the GPi influenced the variance in total score on the Unified Parkinson's Disease Rating Scale in the postoperative `off' period, and in `on' period dyskinesia scores. Within the posteroventral GPi, anteromedial lesions were associated with greater improvement in `off' period contralateral rigidity and `on' period dyskinesia, whereas more centrally located lesions correlated with better postoperative scores of contralateral akinesia and postural instability/gait disturbance. Improvement in contralateral tremor was weakly related to lesion location, being greater with posterolateral lesions. We conclude that improvement in specific motor signs in Parkinson's disease following pallidotomy is related to lesion position within the posteroventral GPi. These findings are consistent with the known segregated but parallel organization of specific motor circuits in the basal ganglia, and may explain the variability in clinical outcome after pallidotomy and therefore have important therapeutic implications.
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DOI: 10.1093/brain/122.3.405
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ISTEX:4D01AE3918DE153E9C542F7C713A50DD95E26B5CLe document en format XML
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<term>UPDRS = Unified Parkinson's Disease Rating Scale</term>
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<front><div type="abstract" xml:lang="en">The purpose of this study was to examine the relationship between lesion location and clinical outcome following globus pallidus internus (GPi) pallidotomy for advanced Parkinson's disease. Thirty-three patients were prospectively studied with extensive neurological examinations before and at 6 and 12 months following microelectrode-guided pallidotomy. Lesion location was characterized using volumetric MRI. The position of lesions within the posteroventral region of the GPi was measured, from anteromedial to posterolateral along an axis parallel to the internal capsule. To relate lesion position to clinical outcome, hierarchical multiple regression analysis was used. The variance in outcome measures that was related to preoperative scores and lesion volume was first calculated, and then the remaining variance attributable to lesion location was determined. Lesion location along the anteromedial-to-posterolateral axis within the GPi influenced the variance in total score on the Unified Parkinson's Disease Rating Scale in the postoperative `off' period, and in `on' period dyskinesia scores. Within the posteroventral GPi, anteromedial lesions were associated with greater improvement in `off' period contralateral rigidity and `on' period dyskinesia, whereas more centrally located lesions correlated with better postoperative scores of contralateral akinesia and postural instability/gait disturbance. Improvement in contralateral tremor was weakly related to lesion location, being greater with posterolateral lesions. We conclude that improvement in specific motor signs in Parkinson's disease following pallidotomy is related to lesion position within the posteroventral GPi. These findings are consistent with the known segregated but parallel organization of specific motor circuits in the basal ganglia, and may explain the variability in clinical outcome after pallidotomy and therefore have important therapeutic implications.</div>
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