Sydenham's chorea: risk factors and the role of prophylactic benzathine penicillin G in preventing recurrence.

To determine the effect of prophylactic long-acting penicillin G in preventing recurrence of Sydenham's chorea and to discover the risk factors associated with occurrence of symptoms, 18 children with symptoms over a 5-year period were prospectively identified. Of these, ten were boys and eight were girls. The majority occurred between the ages of 8 and 10 years [mean (SD) 9.10 (2.62) years]. Sydenham's chorea was generalized in 14 children and one-sided in four. There was no difference in the incidence of right- and left-sided hemichorea. Among the risk factors examined, only a history of chorea in relatives had a significant association with the occurrence of Sydenham's chorea (OR = 6.39; 95% CI 1.30-31.3). A comparison of recurrence between those given prophylactic long-acting penicillin G and those who had none showed a statistically significant difference in the recurrence experience between the two groups (p < 0.02).