Orthostatic tremor: delayed onset following head trauma.

Abstract

Orthostatic tremor is a 14 to 16Hz (range 7 to 36Hz) tremor of uncertain etiology elicited within seconds of an isometric contraction. It is described as a shaking, cramping of the lower extremities upon standing and is relieved with movement or sitting. Typically patients are unable to stand in place for long periods of time secondary to instability and fatigue. A 73-year-old woman with orthostatic tremor following a history of head trauma is presented. Recognition of the characteristic history and electromyographic findings may lead to appropriate treatment for this annoying and sometimes incapacitating disorder.