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Early childhood attention deficit hyperactivity disorder predicts poorer response to acute lithium therapy in adolescent mania.
Journal of Affective Disorders 1998 November
We compared the response to acute lithium therapy in 30 adolescents, 13-17 years of age, with mania and a prior history of early childhood attention deficit hyperactivity disorder (ADHD) to a sex- and age-matched control group of adolescent manics without premorbid psychiatric illness. Response to treatment was assessed daily over the course of 28 days using measures of global clinical improvement and severity ratings on the Bech-Rafaelsen Mania Scale (BRMS). BRMS scores decreased by a mean of 24.3 in the subgroup without prior ADHD compared to 16.7 in patients with ADHD (P = 0.0005). The average percent drop in BRMS scores over the study period in these two subgroups was 80.6% and 57.7%, respectively (P = 0.0005). Time to onset of sustained global clinical improvement was also assessed using Kaplan-Meier survival methods and possible covariates of time to improvement were tested in a Cox proportional hazards model. Median time to onset of sustained improvement was lengthened significantly in patients with early ADHD (23 days) compared to those without it (17 days; log rank chi2 = 7.2, P = 0.007). The results suggest that early childhood ADHD defines an important source of heterogeneity in bipolar illness with developmental, clinical, and neuropharmacogenetic implications.
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