OBSERVATIONS ON CHOREA.

Physiological observations in Sydenham's chorea.

Involuntary movements in a patient with Sydenham's chorea were usually characterised by bursts of EMG activity lasting more than 100 ms, occurring asynchronously in antagonist muscles. The "hung-up" knee jerk was a choreic movement induced by the tendon tap. Exaggerated voluntary movements were produced with EMG burst longer than normal.

Sydenham's Chorea

Sydenham’s chorea is a delayed complication of group Aßhaemolytic streptococcal infections and forms one of the majorcriteria of acute rheumatic fever.It is characterised bychorea, muscular weakness, and a number of neuropsychiatricsymptoms. It is considered to be an autoantibody mediated disorderwith the evidence suggesting that patients with Sydenham’schorea produce antibodies that cross reac...

Huntington's chorea.

The pharmacological treatment of Huntington's chorea has been based on the use of neuroleptic drugs, on the hypothesis that there is a functional dopaminergic hyperactivity in this illness (Agid, 1975). More recently, after the observation of reduced cholinergic and GABAminergic activity at the striatal level in brains of choreic subjects (McGeer et al., 1973; Stahl and Swanson, 1974; Bird and ...

Sydenham's chorea.

Sydenham's chorea (SC) is a disorder of the central nervous system (CNS) characterized by sudden, involuntary, arrhythmic, clonic, and purposeless movements. SC appears to provide a model for understanding various neuropsychiatric dysfunctions. Its relationship with attentional deficits, obsessive-compulsive symptoms (OCS) as well as movement disorders provides support for the hypothesis of the...

Chorea Gravis