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At least 127 records · Page 7Linked to original sources
PubMed2006

Increased tremor severity in bilineal essential tremor: a report of two families.

Up to 6% of the general population have essential tremor (ET). In a number of couples both partners may have ET. The clinical profile of ET in children and the parents where both parents and the child have ET remains to be established. We report on two families where both parents and one child have ET. The severity of ET was greater in the children than in either parent. Such families could provide special opportunity to determine relation between genotype and phenotypic expression of ET.

Adult↗
PubMed1997

The Washington Heights-Inwood Genetic Study of Essential Tremor: methodologic issues in essential-tremor research.

Essential tremor (ET) is the most prevalent movement disorder. It is unknown to what extent ET clusters within families, and the role of genetic susceptibility in etiology of ET has not been adequately investigated at the population level. The problem is largely methodological, with few well-designed studies. The Washington Height-Inwood Genetic Study of ET, begun in 1955, is designed to investigate the genetics of ET using a methodology that has not been applied to ET research to date. Part of the design includes a new set of clinical and electrophysiological diagnostic criteria for ET; the present paper describes this novel study design.

Case-Control Studies↗
PubMed1996

Thalamic tremor: case reports and implications of the tremor-generating mechanism.

We report two patients with unilateral resting and postural tremor of the upper limb as a delayed manifestation of thalamic stroke. Neuroradiologic examination showed a lesion in the posterolateral thalamic region in both patients, but with no obvious involvement of the brainstem, the cerebellum, or the cerebellar outflow tract to the thalamic ventrolateral nucleus.

Adult↗
PubMed1996

How familial is familial tremor? The genetic epidemiology of essential tremor.

Essential tremor (ET) is commonly assumed to be partly genetic. This is due to a seemingly excess aggregation within certain families. There are many families containing more than one member with ET, and some large kindreds with multiple affected individuals. Despite this, the proportion of ET cases with affected family members is not known. Estimates vary from 17 to 100%. Additionally, none of the published studies employed control subjects. Therefore, it is unknown to what extent ET aggregates within families beyond that expected by chance, and the importance of genetic susceptibility in the etiology of ET at the population level has not been established. Additionally, whether or not some clinical subtypes of ET are more likely than others to be influenced by genetic susceptibility is unclear. Some studies suggest that early-onset ET may be familial, although increased awareness and earlier recognition of symptoms is an issue. Although many data support the view that ET susceptibility is inherited in an autosomal dominant manner, most studies are kindreds or service-based studies that might favor selection of families with apparent autosomal dominant modes of inheritance. One community-based study suggested an autosomal dominant mode of inheritance, but this has not been confirmed in studies of more heterogeneous populations. Further understanding of the extent of familial aggregation, extent of genetic heterogeneity, and mode of inheritance is essential for clinical counseling and for further research aimed at localizing and identifying susceptibility genes.

Disease Progression↗