Essential tremor

Posted by mrgfusroyalcare on September 10th, 2022

Essential tremor is the most common form of tremor, and probably the most common movement disorder in general. Unfortunately, there is no uniformly accepted definition of essential tremor. Widely used definitions are those developed by the Movement Disorder Society’s Tremor Investigation Group and those used in the Washington Heights-Inwood genetic study, but several others exist. However, the percentage of individuals fulfilling different commonly used diagnostic criteria for essential tremor has shown considerable variation. The Movement Disorder Society’s Tremor Investigation Group defines essential tremor as a bilateral, largely symmetric postural or kinetic tremor involving hands and forearms that is visible and persistent, and in which there is no other explanation for the tremor. Additional or isolated head tremor is compatible with essential tremor as long as there is no abnormal head posturing. In view of the difficulties in applying essential tremor diagnostic criteria, it may be reasonable to consider treating individuals even if they do not strictly fulfill these criteria. Probably, essential tremor reflects a clinical syndrome rather than a single disease entity.

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Only about half of essential tremor patients report a positive family history, which means that the term “familial tremor” is not congruent with essential tremor.  Although the diagnostic criteria require “largely symmetric” tremor, 50% of 487 consecutive individuals diagnosed with essential tremor at Mayo Clinic had asymmetrical disease, most of them with greater tremor severity on their dominant side. A tremor strictly confined to an ipsilateral arm and leg tremor is less likely essential tremor and more likely secondary to a structural lesion. Essential tremor usually has a frequency of 5 to 10 Hz and no latency to onset. Royal Care Super Speciality Hospital in Coimbatore is the only Neuro-Care center in all of India, facilitated with expertise and technology that provides an MRgFUS (Magnetic Resonance guided Focused Ultrasound) therapy to Essential Tremors and Parkinson’s patients with tremors.