Orthostatic tremor: An essential tremor variant?
Identifieur interne : 001578 ( Istex/Corpus ); précédent : 001577; suivant : 001579Orthostatic tremor: An essential tremor variant?
Auteurs : Stella M. Papa ; GershanikSource :
- Movement Disorders [ 0885-3185 ] ; 1988.
English descriptors
Abstract
Three patients with a clear‐cut history of essential tremor of the upper limbs presented with the clinical features reported by Heilman as orthostatic tremor. Electromyographic findings included 6–8 Hz postural tremor in all four limbs. Highly synchronized 16 Hz rhythmic discharges were found in the legs upon standing. This peculiar pattern of discharge was also observed in the upper limbs and spinal muscles. High frequency rhythmic bursts, either alternating or co‐contracting were present in specific postures not necessarily related to standing. An additional group of 12 patients with postural tremor of the legs was studied; seven of these showed modification in the frequency and synchronization of the muscle discharges upon standing. Although none of them had the full‐blown clinical syndrome of orthostatic tremor, they complained of mild unsteadiness upon standing, together with a vague sensation of stiffness in the lower limbs. The present findings induce us to think that there might be a link between essential tremor and the so‐called orthostatic tremor. Orthostatic tremor might be an essential‐tremor‐related entity that may be caused by a derangement in the central mechanism in charge of the organization of certain motor activities, not necessarily controlling the standing position.
Url:
DOI: 10.1002/mds.870030201
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ISTEX:81E01860F01F693C2D9E96E40F09166BE645250FLe document en format XML
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Electromyographic findings included 6–8 Hz postural tremor in all four limbs. Highly synchronized 16 Hz rhythmic discharges were found in the legs upon standing. This peculiar pattern of discharge was also observed in the upper limbs and spinal muscles. High frequency rhythmic bursts, either alternating or co‐contracting were present in specific postures not necessarily related to standing. An additional group of 12 patients with postural tremor of the legs was studied; seven of these showed modification in the frequency and synchronization of the muscle discharges upon standing. Although none of them had the full‐blown clinical syndrome of orthostatic tremor, they complained of mild unsteadiness upon standing, together with a vague sensation of stiffness in the lower limbs. The present findings induce us to think that there might be a link between essential tremor and the so‐called orthostatic tremor. 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Electromyographic findings included 6–8 Hz postural tremor in all four limbs. Highly synchronized 16 Hz rhythmic discharges were found in the legs upon standing. This peculiar pattern of discharge was also observed in the upper limbs and spinal muscles. High frequency rhythmic bursts, either alternating or co‐contracting were present in specific postures not necessarily related to standing. An additional group of 12 patients with postural tremor of the legs was studied; seven of these showed modification in the frequency and synchronization of the muscle discharges upon standing. Although none of them had the full‐blown clinical syndrome of orthostatic tremor, they complained of mild unsteadiness upon standing, together with a vague sensation of stiffness in the lower limbs. The present findings induce us to think that there might be a link between essential tremor and the so‐called orthostatic tremor. Orthostatic tremor might be an essential‐tremor‐related entity that may be caused by a derangement in the central mechanism in charge of the organization of certain motor activities, not necessarily controlling the standing position.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><!--Version 0.6 générée le 4-12-2015--><mods version="3.6"><titleInfo lang="en"><title>Orthostatic tremor: An essential tremor variant?</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>ORTHOSTATIC TREMOR</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Orthostatic tremor: An essential tremor variant?</title></titleInfo><name type="personal"><namePart type="given">Stella M.</namePart><namePart type="family">Papa</namePart><affiliation>Sección Enfermedades Extrapiramidales, Centro Neurológico, Hospital Francés, Buenos Aires, Argentina</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="termsOfAddress">Dr.</namePart><namePart type="family">Gershanik</namePart><affiliation>Sección Enfermedades Extrapiramidales, Centro Neurológico, Hospital Francés, Buenos Aires, Argentina</affiliation><description>Correspondence: At Sección Enfermedades Extrapiramidales, Centro Neurológico‐Hospital Francés, La Rioja 951, Buenos Aires (1221), Argentina</description><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre authority="originalCategForm">article</genre><originInfo><publisher>Wiley Subscription Services, Inc., A Wiley Company</publisher><place><placeTerm type="text">Hoboken</placeTerm></place><dateIssued encoding="w3cdtf">1988</dateIssued><copyrightDate encoding="w3cdtf">1988</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">6</extent><extent unit="tables">2</extent><extent unit="references">14</extent></physicalDescription><abstract lang="en">Three patients with a clear‐cut history of essential tremor of the upper limbs presented with the clinical features reported by Heilman as orthostatic tremor. Electromyographic findings included 6–8 Hz postural tremor in all four limbs. Highly synchronized 16 Hz rhythmic discharges were found in the legs upon standing. This peculiar pattern of discharge was also observed in the upper limbs and spinal muscles. High frequency rhythmic bursts, either alternating or co‐contracting were present in specific postures not necessarily related to standing. An additional group of 12 patients with postural tremor of the legs was studied; seven of these showed modification in the frequency and synchronization of the muscle discharges upon standing. Although none of them had the full‐blown clinical syndrome of orthostatic tremor, they complained of mild unsteadiness upon standing, together with a vague sensation of stiffness in the lower limbs. The present findings induce us to think that there might be a link between essential tremor and the so‐called orthostatic tremor. Orthostatic tremor might be an essential‐tremor‐related entity that may be caused by a derangement in the central mechanism in charge of the organization of certain motor activities, not necessarily controlling the standing position.</abstract><subject lang="en"><genre>Keywords</genre><topic>Orthostatic tremor</topic><topic>Essential tremor</topic><topic>Electrophysiology</topic><topic>Postural instability</topic></subject><relatedItem type="host"><titleInfo><title>Movement Disorders</title><subTitle>Official Journal of the Movement Disorder Society</subTitle></titleInfo><titleInfo type="abbreviated"><title>Mov. 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