Document Detail


Rigidity decreases resting tremor intensity in Parkinson's disease: A [(123)I]beta-CIT SPECT study in early, nonmedicated patients.
MedLine Citation:
PMID:  11748734     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Tremor is one of the clinical hallmarks of Parkinson's disease (PD). Although it is accepted that other classic symptoms of PD such as rigidity and bradykinesia result from a degeneration of the nigrostriatal system and subsequent reduction in striatal dopamine, the pathophysiology of resting tremor remains unclear. The majority of recent single photon emission computed tomography (SPECT) and positron emission tomography (PET) studies, using various radioligands, demonstrated significant correlation between striatal radioligand bindings and the degree of parkinsonian symptoms such as rigidity and bradykinesia, but not tremor. We investigate the relationship between the degeneration of the nigrostriatal pathway and the appearance of resting tremor, taking into account the possible interference of rigidity with the resting tremor. Thirty early and drug-naïve PD patients were examined. Tremor and rigidity of the arms were assessed using UPDRS, and the power of tremor was estimated using spectral analysis of tremor peaks. [(123)I]beta-CIT SPECT was used to assess degeneration of the dopaminergic system in PD patients. A comparison between asymmetry indices showed that in terms of both tremor and rigidity, the most affected arm corresponded significantly with the contralateral striatum, having the largest reduction in radioligand binding. Furthermore, tremor power accounted for a significant part of variance in the contralateral striatum, suggesting a relationship between this PD symptom and the degeneration of the dopaminergic system. Further, the degree of tremor was reduced with increasing rigidity. However, correcting for the influence of rigidity, the significant contribution of tremor in the variance in the contralateral striatal [(123)I]beta-CIT binding disappeared. When the confounding influence of rigidity is taken into account, no significant direct relationship between dopaminergic degeneration and the degree of tremor could be found. Other pathophysiological mechanisms should be similarly investigated in order to further our understanding of the origin of resting tremor in PD.
Authors:
A Winogrodzka; R C Wagenaar; P Bergmans; A Vellinga; J Booij; E A van Royen; R E van Emmerik; J C Stoof; E C Wolters
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Movement disorders : official journal of the Movement Disorder Society     Volume:  16     ISSN:  0885-3185     ISO Abbreviation:  Mov. Disord.     Publication Date:  2001 Nov 
Date Detail:
Created Date:  2001-12-18     Completed Date:  2002-01-25     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8610688     Medline TA:  Mov Disord     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1033-40     Citation Subset:  IM    
Copyright Information:
Copyright 2001 Movement Disorder Society.
Affiliation:
Department of Neurology, University Hospital Vrije Universiteit, Amsterdam, The Netherlands. a.winogrodzka@azvu.nl
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MeSH Terms
Descriptor/Qualifier:
Adult
Cocaine / analogs & derivatives,  diagnostic use*
Corpus Striatum / radionuclide imaging
Dominance, Cerebral
Female
Humans
Iodine Radioisotopes / diagnostic use*
Male
Middle Aged
Muscle Rigidity / physiopathology*
Parkinson Disease / physiopathology*,  radionuclide imaging
Radiopharmaceuticals / diagnostic use
Severity of Illness Index
Tomography, Emission-Computed, Single-Photon* / methods
Tremor / physiopathology*
Chemical
Reg. No./Substance:
0/Iodine Radioisotopes; 0/Radiopharmaceuticals; 133647-95-7/RTI 55; 50-36-2/Cocaine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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