Article

Orthostatic tremor due to thiamine deficiency

Movement Disorders (Impact Factor: 5.68). 02/2007; 22(3):440-1. DOI: 10.1002/mds.21193
Source: PubMed
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    • "In addition to idiopathic cases [13], slow OT has been associated with familial essential tremor [16], multiple sclerosis [17], Parkinson's disease and parkinsonism [18]. OT has been associated with Graves disease [19], thiamine deficiency [20], monoclonal and biclonal gammopathy of underdetermined significance [21] [22], and small cell cancer lung cancer with positive anti-Hu antibodies [23]. Other unusual associations include delayed onset OT after head trauma [24], a nonenhancing structural lesion in the left dorsolateral midbrain [25] and lesions (schwannoma and tuberculoma) affecting the pontine structures [26]. "
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    ABSTRACT: Objective To evaluate the clinical characteristics, associated features, and treatment response of a large orthostatic tremor series seen over a 26-year period. Methods We reviewed the medical records of 45 patients seen between 1987 and 2013 who fulfilled the diagnostic criteria for orthostatic tremor. Results The mean age at onset was 59.5 years and 23/45 (51%) were men. A family history of any tremor was noted in 23/45 (51%) patients. A family history of orthostatic tremor was reported in 3/45 (7%) patients. 40/45 (89%) had primary orthostatic tremor with (n=30) or without (n=10) an associated postural arm tremor. We found that 5/45 (11%) had orthostatic tremor plus additional neurological features. One patient was diagnosed with dementia with Lewy bodies preceded by orthostatic tremor for 20 years. Prospective follow-up data was available for 30/45 patients and averaged 54.4 months. Treatment response to medications was modest and inconsistent. In 11/30 cases, orthostatic tremor worsened over the follow-up period. One patient with primary orthostatic tremor underwent thalamic deep brain stimulation surgery. Conclusions In our population of orthostatic tremor patients, mild postural hand tremor was a frequent finding. Over half of our patients had a family history of tremor, but a family history of orthostatic tremor was uncommon. Additional neurological features were seen in the minority of patients and we report possibly the first case of dementia with Lewy bodies associated with orthostatic tremor. Our series is the largest series of orthostatic tremor reported in the literature and contributes to understanding the clinical characteristics of this rare disease.
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    ABSTRACT: This chapter discusses coal utilization technology for reducing carbon dioxide emission. Developments in coal utilization technology are quite important, particularly considering the mitigation of green house gas (GHG) emissions. Coal can be used not only as combustion fuel but also as a raw material for conversion technologies, such as gasification and liquefaction. Gasification efficiency increases generally with decreasing coal rank. The heating value of the products through the gasification is almost proportionate to the carbon content o f coal, but the heating value of lower rank coals is slightly lower than the proportionate heating value to the carbon content. The gross heating values of the products of coal conversion technologies are calculated for various coals assuming the theoretical reactions. The overall CO2 emissions are estimated, including products combustion and CO2 generated from conversion.
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    ABSTRACT: Tremor represents one of the most common movement disorders worldwide. It affects both sexes and may occur at any age. In most cases, tremor is disabling and causes social difficulties, resulting in poorer quality of life. Tremor is now recognized as a public health issue given the ageing of the population. Tremor is a complex phenomenon that has attracted the attention of scientists from various disciplines. Tremor results from dynamic interactions between multiple synaptically coupled neuronal systems and the biomechanical, physical, and electrical properties of the external effectors. There have been major advances in our understanding of tremor pathogenesis these last three decades, thanks to new imaging techniques and genetic discoveries. Moreover, significant progress in computer technologies, developments of reliable and unobtrusive wearable sensors, improvements in miniaturization, and advances in signal processing have opened new perspectives for the accurate characterization and daily monitoring of tremor. New therapies are emerging. In this book, we provide an overview of tremor from pathogenesis to therapeutic aspects. We review the definitions, the classification of the varieties of tremor, and the contribution of central versus peripheral mechanisms. Neuroanatomical, neurophysiological, neurochemical, and pharmacological topics related to tremor are pointed out. Our goals are to explain the fundamental basis of tremor generation, to show the recent technological developments, especially in instrumentation, which are reshaping research and clinical practice, and to provide up-to-date information related to emerging therapies. The integrative transdisciplinary approach has been used, combining engineering and physiological principles to diagnose, monitor, and treat tremor. Guidelines for evaluation of tremor are explained. This book has been written for biomedical engineering students, engineers, researchers, medical students, biologists, neurologists, and biomedical professionals of any discipline looking for an updated and multidisciplinary overview of tremor. It can be used for biomedical courses.
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