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Essential Tremor

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https://www.readbyqxmd.com/read/28917524/tremor-dominant-kyoto-trdk-rats-carry-a-missense-mutation-in-the-gene-encoding-the-sk2-subunit-of-small-conductance-ca-2-activated-k-channel
#1
Takashi Kuramoto, Mayuko Yokoe, Naofumi Kunisawa, Kana Ohashi, Takahito Miyake, Yuki Higuchi, Kazuto Yoshimi, Tomoji Mashimo, Miyuu Tanaka, Mitusru Kuwamura, Shuji Kaneko, Saki Shimizu, Tadao Serikawa, Yukihiro Ohno
Tremor dominant Kyoto (Trdk) is an autosomal dominant mutation that appeared in F344/NSlc rats mutagenized with N-ethyl-N-nitrosourea (ENU). In this study, we characterized and genetically analyzed F344-Trdk/+ heterozygous rats. The rats exhibited a tremor that was especially evident around weaning but persisted throughout life. The tremors of F344-Trdk/+ rats were attenuated by drugs effective against essential tremor (ET) but not drugs used to treat Parkinson's disease-related tremor, indicating that the pharmacological phenotype of F344-Trdk/+ rats was similar to human ET...
September 13, 2017: Brain Research
https://www.readbyqxmd.com/read/28917284/neurosurgical-applications-of-high-intensity-focused-ultrasound-with-magnetic-resonance-thermometry
#2
REVIEW
Rivka R Colen, Iman Sahnoune, Jeffrey S Weinberg
Magnetic resonance guided focused ultrasound surgery (MRgFUS) has potential noninvasive effects on targeted tissue. MRgFUS integrates MRI and focused ultrasound surgery (FUS) into a single platform. MRI enables visualization of the target tissue and monitors ultrasound-induced effects in near real-time during FUS treatment. MRgFUS may serve as an adjunct or replace invasive surgery and radiotherapy for specific conditions. Its thermal effects ablate tumors in locations involved in movement disorders and essential tremors...
October 2017: Neurosurgery Clinics of North America
https://www.readbyqxmd.com/read/28913163/general-and-selective-brain-connectivity-alterations-in-essential-tremor-a-resting-state-fmri-study
#3
Karsten Mueller, Robert Jech, Martina Hoskovcová, Olga Ulmanová, Dušan Urgošík, Josef Vymazal, Evžen Růžička
Although essential tremor is the most common movement disorder, there is little knowledge about the pathophysiological mechanisms of this disease. Therefore, we explored brain connectivity based on slow spontaneous fluctuations of blood oxygenation level dependent (BOLD) signal in patients with essential tremor (ET). A cohort of 19 ET patients and 23 healthy individuals were scanned in resting condition using functional magnetic resonance imaging (fMRI). General connectivity was assessed by eigenvector centrality (EC) mapping...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28905504/is-essential-tremor-a-single-entity
#4
Franziska Hopfner, Günther Deuschl
Essential tremor (ET) is a frequent movement disorder. A new tremor classification has subdivided ET, into the classical form with bilateral action tremor of the hands with or without involvement of further tremor locations and without any other explaining signs or symptoms for the tremor and into 'ET plus' which comes additionally with further neurologic signs of unknown origin. This will provide a better foundation for subclassifying the condition. The immediate cause of ET is a preformed oscillating network within the central nervous system as revealed with electrophysiologic methods...
September 14, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/28884038/differential-diagnosis-of-parkinson-disease-essential-tremor-and-enhanced-physiological-tremor-with-the-tremor-analysis-of-emg
#5
Jie Zhang, Yan Xing, Xiuli Ma, Liqun Feng
We investigate the differential diagnostic value of tremor analysis of EMG on Parkinson's disease (PD), essential tremor (ET), and enhanced physiological tremor (EPT). Clinical data from 25 patients with PD, 20 patients with ET, and 20 patients with EPT were collected. The tremor frequency and muscle contraction pattern of the resting, posture, and 500 g and 1000 g overload were recorded. The frequency of PD tremor was 4-6 Hz, and the frequency of ET was also in this range; the frequency of EPT is 6-12 hz having some overlap with PD...
2017: Parkinson's Disease
https://www.readbyqxmd.com/read/28867587/cerebellar-pathology-in-childhood-onset-vs-adult-onset-essential-tremor
#6
Elan D Louis, Sheng-Han Kuo, William J Tate, Geoffrey C Kelly, Phyllis L Faust
Although the incidence of ET increases with advancing age, the disease may begin at any age, including childhood. The question arises as to whether childhood-onset ET cases manifest the same sets of pathological changes in the cerebellum as those whose onset is during adult life. We quantified a broad range of postmortem features (Purkinje cell [PC] counts, PC axonal torpedoes, a host of associated axonal changes [PC axonal recurrent collateral count, PC thickened axonal profile count, PC axonal branching count], heterotopic PCs, and basket cell rating) in 60 ET cases (11 childhood-onset and 49 adult-onset) and 30 controls...
September 1, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28855888/the-experience-of-essential-tremor-caregivers-burden-and-its-correlates
#7
Sarah Morgan, Sarah Kellner, Jesus Gutierrez, Kathleen Collins, Brittany Rohl, Fanny Migliore, Stephanie Cosentino, Edward D Huey, Elan D Louis, Joan K Monin
BACKGROUND: Essential tremor (ET) is associated with physical and cognitive impairments, as well as embarrassment, avoidance of social settings, and related difficulties that negatively impact the lives of patients. In similar disease contexts, burden on friends and relatives acting as caregivers has been noted and has well-documented implications. There has been no study examining caregiver burden related to ET. METHODS: Data were gathered from 55 ET participants enrolled in a clinical study and their caregivers...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28855798/abnormalities-of-dopamine-d3-receptor-signaling-in-the-diseased-brain
#8
REVIEW
G Aleph Prieto
Dopamine D3 receptors (D3R) modulate neuronal activity in several brain regions including cortex, striatum, cerebellum, and hippocampus. A growing body of evidence suggests that aberrant D3R signaling contributes to multiple brain diseases, such as Parkinson's disease, essential tremor, schizophrenia, and addiction. In line with these findings, D3R has emerged as a potential target in the treatment of neurological disorders. However, the mechanisms underlying neuronal D3R signaling are poorly understood, either in healthy or diseased brain...
2017: Journal of Central Nervous System Disease
https://www.readbyqxmd.com/read/28844041/how-to-use-pen-and-paper-tasks-to-aid-tremor-diagnosis-in-the-clinic
#9
EDITORIAL
Jane Alty, Jeremy Cosgrove, Deborah Thorpe, Peter Kempster
When a patient presents with tremor, it can be useful to perform a few simple pen and paper tests. In this article, we explain how to maximise the value of handwriting and of drawing Archimedes spirals and straight lines as clinical assessments. These tasks take a matter of seconds to complete but provide a wealth of information that supplements the standard physical examination. They aid the diagnosis of a tremor disorder and can contribute to its longitudinal monitoring. Watching the patient's upper limb while they write and draw may reveal abnormalities such as bradykinesia, dystonic posturing and distractibility...
August 26, 2017: Practical Neurology
https://www.readbyqxmd.com/read/28841694/differential-diagnosis-between-parkinson-s-disease-and-essential-tremor-using-the-smartphone-s-accelerometer
#10
Sergi Barrantes, Antonio J Sánchez Egea, Hernán A González Rojas, Maria J Martí, Yaroslau Compta, Francesc Valldeoriola, Ester Simo Mezquita, Eduard Tolosa, Josep Valls-Solè
BACKGROUND: The differential diagnosis between patients with essential tremor (ET) and those with Parkinson's disease (PD) whose main manifestation is tremor may be difficult unless using complex neuroimaging techniques such as 123I-FP-CIT SPECT. We considered that using smartphone's accelerometer to stablish a diagnostic test based on time-frequency differences between PD an ET could support the clinical diagnosis. METHODS: The study was carried out in 17 patients with PD, 16 patients with ET, 12 healthy volunteers and 7 patients with tremor of undecided diagnosis (TUD), who were re-evaluated one year after the first visit to reach the definite diagnosis...
2017: PloS One
https://www.readbyqxmd.com/read/28836659/zonisamide-for-essential-tremor
#11
REVIEW
Elisa Bruno, Alessandra Nicoletti, Graziella Filippini, Graziella Quattrocchi, Carlo Colosimo, Mario Zappia
BACKGROUND: Essential tremor (ET) is one of the most common movement disorders. The treatment is primarily based on pharmacological agents. Although primidone and propranolol are well established treatments in clinical practice, they can be ineffective in 25% to 55% of patients, and can produce serious adverse events in a large percentage of them. For these reasons, it may be worthwhile evaluating the treatment alternatives for ET. Zonisamide has been suggested as a potentially useful agent for the treatment of ET but there is uncertainty about its efficacy and safety...
August 24, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28835402/quality-improvement-in-neurology-essential-tremor-quality-measurement-set
#12
Theresa A Zesiewicz, Kelly L Sullivan, Marcus Ponce de Leon, Amy Bennett, Anna D Hohler
No abstract text is available yet for this article.
August 23, 2017: Neurology
https://www.readbyqxmd.com/read/28832787/-essential-tremor-in-endemic-disease-control-agents-exposed-to-pesticides-a-case-control-study
#13
Marlos Fábio Alves de Azevedo, Armando Meyer
Tremor is the most frequent movement disorder in the population and can be associated with pesticide exposure. The aim was to assess the odds of essential tremor in 442 endemic disease control agents in Rio de Janeiro State, Brazil, exposed to pesticides. Fifty-one cases and 204 controls were selected (1:4). All participants answered a questionnaire on socio-demographic, occupational, and toxicological items. The influence of pesticide exposure on the development of tremor was estimated by non-conditional logistic regression, adjusted for selected covariables...
August 21, 2017: Cadernos de Saúde Pública
https://www.readbyqxmd.com/read/28822302/new-insight-in-spiral-drawing-analysis-methods-application-to-action-tremor-quantification
#14
André Pierre Legrand, Isabelle Rivals, Aliénor Richard, Emmanuelle Apartis, Emmanuel Roze, Marie Vidailhet, Sabine Meunier, Elodie Hainque
OBJECTIVE: Spiral drawing is one of the standard tests used to assess tremor severity for the clinical evaluation of medical treatments. Tremor severity is estimated through visual rating of the drawings by movement disorders experts. Different approaches based on the mathematical signal analysis of the recorded spiral drawings were proposed to replace this rater dependent estimate. The objective of the present study is to propose new numerical methods and to evaluate them in terms of agreement with visual rating and reproducibility...
July 17, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28817495/nursing-management-of-the-patient-undergoing-focused-ultrasound-a-new-treatment-option-for-essential-tremor
#15
Katherine Dale Shaw, Amy Sue Johnston, Shelly Rush-Evans, Susan Prather, Kathy Maynard
Essential tremor (ET) is among the most common neurological movement disorders that causes postural or action tremors, with an estimated prevalence nationwide of less than 3% of the population. The incidence of ET increases with age but often affects younger adults and has a familial trait association. Depending on disease progression, ET can cause significant limitations for individuals, in many cases, significantly limiting their ability to perform activities of daily living and occupational responsibilities...
August 16, 2017: Journal of Neuroscience Nursing: Journal of the American Association of Neuroscience Nurses
https://www.readbyqxmd.com/read/28813814/toward-quantitative-characterization-of-essential-tremor-for-future-tremor-suppression
#16
Steven K Charles, Daniel W Geiger, Andrew D Davidson, Adam C Pigg, C Paul Curtis, Brendon C Allen
Tremor is the most common movement deficit and manifests in a variety of disorders, including Essential Tremor, Parkinson's Disease, Dystonia, and Cerebellar Ataxia. Although medication and surgical interventions have significantly reduced patient suffering, they are only partially effective and can carry undesired side effects, leaving many patients without satisfactory treatment options. Wearable tremor-suppressing devices could provide an alternative to medication and surgery. Multiple research groups have developed orthotic prototypes to low-pass filter tremor, but these devices have not yet been optimized for in-vivo use...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28810261/comparative-evaluation-of-magnetic-resonance-guided-focused-ultrasound-surgery-for-essential-tremor
#17
Minsoo Kim, Na Young Jung, Chang Kyu Park, Won Seok Chang, Hyun Ho Jung, Jin Woo Chang
BACKGROUND: Treatment options for patients with drug-resistant essential tremor (ET) are limited. Magnetic resonance-guided focused ultrasound surgery (MRgFUS) is an emerging technique to treat refractory ET. OBJECTIVES: To present MRgFUS as an alternative to radiofrequency (RF) thalamotomy or deep brain stimulation (DBS) for ET treatment. METHODS: We retrospectively analyzed 59 patients who underwent unilateral surgery for drug-resistant ET...
2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28805576/nonmotor-symptoms-in-essential-tremor-and-other-tremor-disorders
#18
Alessandro F Fois, Hugo M Briceño, Victor S C Fung
Tremor, like dystonia, is a term used at the phenomenological, syndromic, and aetiopathological level. Parkinsonian, essential, and dystonic tremor are the three most common tremor diagnoses encountered in clinical practice. Investigation of nonmotor symptoms in essential tremor and dystonic tremor syndromes is significantly hampered by the lack of clear clinical diagnostic criteria for these groups at a syndromic level, and the absence of biomarkers which allow definitive diagnosis at an aetiopathological level...
2017: International Review of Neurobiology
https://www.readbyqxmd.com/read/28805131/brain-positron-emission-tomography-with-2-18-f-2-deoxi-d-glucose-of-patients-with-dystonia-and-essential-tremor-detects-differences-between-these-disorders
#19
Vadim Belenky, Andrei Stanzhevsky, Olga Klicenko, Alexandr Skoromets
We studied patients with dystonia (D) and essential tremor (ET) using positron emission tomography (PET) equipped with Cortex ID software. This allowed PET brain visualisation to be compared to scans of a control group by means of the z-score. The study revealed hypo-metabolism in both D and ET groups, and additionally revealed a difference between these two groups of patients in certain areas of the brain. These two nosological forms overlap in clinical features and are difficult to differentiate. The PET picture may help to provide a differential diagnosis in addition to the biochemical difference in dopamine exchange previously revealed by us in this group of patients...
January 1, 2017: Neuroradiology Journal
https://www.readbyqxmd.com/read/28801652/assessment-of-three-new-loci-from-genome-wide-association-study-in-essential-tremor-in-chinese-population
#20
Yuan Zhang, Yuwen Zhao, Xiaoting Zhou, Kai Li, Minhan Yi, Jifeng Guo, Xinxiang Yan, Beisha Tang, Qiying Sun
Essential tremor (ET) is the most common tremor disorder. Evidences indicated that genetics plays an essential role in the researches of etiology. A new genome-wide association study (GWAS) from European population identified three novel loci in ET, which were rs10937625 in STK32B, rs17590046 in PPARGC1A, and rs12764057, rs10822974 and rs7903491 in CTNNA3. Due to the different genetic background in different population, we performed a case-control study to investigate these variants in a cohort of 533 subjects in Chinese population...
August 11, 2017: Scientific Reports
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