title: [Parkinsonian tremor, rigidity and flapping tremor].
abstract: Tremor occurring at rest (4-6 Hz) is considered to be one of the most characteristic symptoms in patients with Parkinson's disease. Yet, an early stages of the disease only 50% of the patients manifest resting tremor. Indeed, about 15% of Parkinsonian patients never display tremor at any stage of the disease. If tremor is present, its type is essential for differential diagnosis. Pill-rolling movement, for instance, is a hallmark of Parkinson's disease. Parkinsonian patients often show postural tremor associated with certain postures or movement, whereas flapping tremor is indicative of metabolic (ex: hepatic) encephalopathy. Parkinsonian rigidity is unique muscular rigidity. If rigidity is abolished by L-dopa or dopamine agonists, this provides a reliable sign for diagnosis of Parkinson's disease. Pathophysiology of different types of tremor is briefly discussed.
authors.affiliation: Department of Neurology, Utano National Hospital.
authors.forename: S
authors.initials: S
authors.lastname: Kuno
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D004576:Electromyography; D006801:Humans; D008297:Male; D009127:Muscle Rigidity / Q000503:physiopathology*; D010300:Parkinson Disease / Q000503:physiopathology*; D014202:Tremor / Q000503:physiopathology*