Rapid Cycling Disorders in Mentally Retarded Children.

Mentally retarded children and adolescents not infrequently develop affective disorders, including a pattern of rapid cycling bipolar disorder. From work with nonretarded adults this pattern is known to have a tendency to chronicity and treatment resistance. Among persons with mental retardation, such a pattern is often marked by periods of severe overexcitation and underexcitation, often producing serious caretaking stress. Generally, it has been difficult to make this diagnosis in persons with severe to profound mental retardation and other severe disabilities, and it is probably often missed. However, knowing which questions to ask may facilitate diagnosis. It is our hypothesis that a positive family history of affective disorder in the presence of brain dysfunction increases the risk of rapid cycling affective disorder. Treatment results so far are limited to case reports and open trials. Much more research needs to be done to identify predictors of bipolar disorder and rapid cycling, the extent to which findings from studies of adults without mental retardation apply, and the most effective methods of treatment.