Motor signs in essential tremor (ET) are varied. Patients may have limb tremors, including postural, kinetic (e.g. writing, pouring), and rest tremors, head tremor, voice tremor, or chin tremor. Factor analysis allows one to determine whether these signs fall into a smaller number of discrete domains. Such an analysis has not been performed on a group of ET cases. ET cases (n = 168) were recruited from the Neurological Institute of New York and a videotaped examination was performed. A factor analysis was performed on 17 motor items. Four distinct factors emerged, explaining 68.7% of the total variance. These were factor I (action tremor in the dominant arm), factor II (action tremor in the nondominant arm), factor III (tremor at rest) and factor IV (chin tremor, head tremor, and voice tremor). The demonstration of these four factors will be of potential use for pathological and genetic studies as well as interventional studies, as will be discussed.

This content is only available via PDF.
Copyright / Drug Dosage / Disclaimer
Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher.
Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.
You do not currently have access to this content.