Tremor Margaret T. Johnson, MD

Tremor

Margaret T. Johnson, MD

Tremor is the involuntary, rhythmic oscillation of reciprocally innervated, antagonistic muscle groups, causing movement of a body part about a fixed plane in space.1,2 Effective treatment of tremor requires distinguishing this type of movement disorder from other movement disorders.

Rhythmicity distinguishes tremor from disorders in which tremor may be a component, such as choreoathetosis and dystonia, and its biphasic nature distinguishes tremor from clonus.1 The frequency and amplitude of a tremor vary to the degree that the tremor may be hardly noticeable or severely disabling. Frequency can be divided into three categories of oscillations per second: slow (3 to 5 Hz), intermediate (5 to 8 Hz) or rapid (9 to 12 Hz).3 Amplitude may be classified as fine, medium or coarse, depending on the displacement produced by the tremor about the fixed plane.3 A coarse tremor has a large displacement, whereas a fine tremor is barely noticeable. Tremor may be unifocal, multifocal or generalized, and may affect the head, face, jaw, voice, tongue, trunk or extremities

http://www.medical-library.org/journals/secure/fm89/secure/essential_tremor.htm

اسم المستخدم: 1929
كلمة السر:1929

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