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Essential tremor (ET), also called benign tremor, familial tremor, and idiopathic tremor, is a medical condition characterized by involuntary rhythmic contractions and relaxations (oscillations or twitching movements) of certain muscle groups in one or more body parts of unknown cause. [6]
Tremors of this disease occur at frequencies of 2–4 Hz or more. [8] Intention tremor is also known to be associated with infections, such as West Nile virus, rubella, H. influenza, rabies, and varicella. [1] [9] A variety of poisons have been shown to cause intention tremor, including mercury, methyl bromide, and phosphine.
It is usually reversible once the cause is corrected. This tremor classically has a frequency of about 10 Hz. [5] Psychogenic tremor (also called hysterical tremor and functional tremor) can occur at rest or during postural or kinetic movement. The characteristics of this kind of tremor may vary but generally include sudden onset and remission ...
Pseudoparkinsonism: drug-induced parkinsonism (rigidity, bradykinesia, tremor, masked facies, shuffling gait, stooped posture, sialorrhoea, and seborrhoea; greater risk in the elderly). [2] Although Parkinson's disease is primarily a disease of the nigrostriatal pathway and not the extrapyramidal system, loss of dopaminergic neurons in the ...
This causes tremors, slowness, stiffness, and walking and balance problems, among other issues, for the 1 million people affected by the disease in the U.S. and 6 million affected worldwide.
Resting tremor is the most common, but kinetic tremors—occurring during voluntary movements—and postural tremor—preventing upright, stable posture—also occur. [19] Tremor largely affects the hands and feet: [ 19 ] a classic parkinsonian tremor is " pill-rolling ", a resting tremor in which the thumb and index finger make contact in a ...
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