I didn't see the video you're referring to, but it could be "benign
essential tremor." I've got a light touch of it, enough to make writing
longhand *extremely* tedious and frustrating, and my handwriting
essentially illegible. It's a heritable trait. My Dad, at 89, shakes
like a friggin' leaf, and has for years.
Benign Essential Tremor
* Presenile Tremor Syndrome
* Tremor, Familial Essential
* Tremor, Hereditary Benign
Benign Essential Tremor is a neurologic movement disorder characterized
by involuntary fine rhythmic tremor of a body part or parts, primarily
the hands and arms (upper limbs). In many affected individuals, upper
limb tremor may occur as an isolated finding. However, in others, tremor
may gradually involve other anatomic regions, such as the head, voice,
tongue, or roof of the mouth (palate), leading to difficulties
articulating speech (dysarthria). Less commonly, tremor may affect
muscles of the trunk or legs.
In individuals with the condition, tremor tends to occur while
voluntarily maintaining a fixed posture against gravity ("postural
tremor") or while performing certain goal-directed movements ("kinetic
intention tremor"). Although tremor is typically absent with rest--i.e.,
when the affected muscle is not voluntary activated--some individuals
with advanced disease may develop resting tremors.
Although symptom onset may occur during childhood or adolescence, the
condition most commonly becomes apparent during adulthood, at an average
age of 45 years. Benign Essential Tremor is generally considered a
slowly progressive disorder. Disease progression is characterized by an
increase in tremor amplitude, causing difficulties in performing fine
motor skills and varying degrees of functional disability. For example,
hand tremor may gradually cause difficulties with manipulating small
objects, drinking fluids from a glass, eating, writing, or dressing. (As
mentioned above, in some affected individuals, disease progression may
also include extension of tremor to other muscle groups.)
Benign Essential Tremor may appear to occur randomly for unknown reasons
(sporadically) or be transmitted as an autosomal dominant trait.
Researchers suggest that changes (mutations) of different genes may be
responsible for the disorder (genetic heterogeneity). For example,
during genetic analysis of several affected families (kindreds),
investigators located a gene for the disorder, known as "FET1," on the
long arm (q) of chromosome 3 (3q13). In another kindred, the disorder
was determined to result from mutations of a gene, designated "ETM2," on
the short arm (p) of chromosome 2 (2p22-p25).
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