CLINICAL MEDICINE

Detailed explanation-1: -The frequency of essential tremor is 4 to 11 Hz, depending on which body segment is affected. Proximal segments are affected at lower frequencies, and distal segments are affected at higher frequencies. Although typically a postural tremor, essential tremor may occur at rest in severe and very advanced cases.

Detailed explanation-2: -Enhanced physiologic tremor is a high-frequency, low-amplitude, visible tremor that occurs primarily when a specific posture is maintained. Drugs and toxins induce this form of tremor. The suspected mechanism is mechanical activation at the muscular level.

Detailed explanation-3: -Orthostatic tremor is the fastest tremor, typically 14 Hz to 16 Hz; orthostatic tremor can be palpated as a quivering sensation in the legs when the patient stands. The 10 major tremor syndromes are listed in the Table, and the phenomenologic features of each disorder are briefly summarized here.

Detailed explanation-4: -Essential tremor is not associated with any known pathology. Its frequency is between 4 and 8 Hz. Orthostatic tremor is characterized by fast (>12 Hz) rhythmic muscle contractions that occur in the legs and trunk immediately after standing up.