Tremor is a common complication of mercury poisoning, especially following industrial exposures. It may show a spectrum of severity, ranging from subclinical to totally disabling the patient.
Parameters:
(1) severity of the tremor
(2) difficulty with delicate motor function (writing, shaving, holding a glass, threading a needle)
(3) difficulty with gross motor function (walking, etc.)
Severity of Tremor
Delicate Motor Function
Gross Motor Function
Grade
none
normal
normal
0
slight static tremor
normal to slight
normal
I
mild static with slight intentional tremor
mild to moderate difficulty
normal to slight difficulty
II
moderate static and intentional tremor
conspicuous difficulties
mild to moderate difficulty
III
severe
totally disabled
conspicuous difficulties
IV
generalized and intense (concussio mercurialis)
totally disabled
totally disabled
V
where:
• A slight static tremor may only be detectable with the arms outstretched with the fingers spread. The patient may be unaware of the movement.
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