Comorbidity of attention-deficit/hyperactivity disorder and bipolar disorder in North Indian clinic children and adolescents

Objective: This study examined comorbidity between attention-deficit/hyperactivity disorder (ADHD) and bipolar disorder (BPD) in children attending child and adolescent psychiatry (CAP) services in a Medical University in North India. Methods: Children attending CAP services, old or new, were assessed using unstructured clinical interview, kiddie-Schedule for Affective Disorders and Schizophrenia for School-age Children-Present and Lifetime Version (K-SADS-PL), Mental State Examination (MSE) for ADHD, Child Mania Rating Scale (CMRS) Parent Version and Children's Global Assessment Scale (C-GAS). Information was collected from both children and parents. All children were clinically evaluated, and prospectively followed up. The diagnosis was made by consensus. Subjects with DSM-IV-TR diagnosis of ADHD, BPD, and ADHD + BPD were compared with each other. Research criteria for broad phenotype BPD were applied in ADHD subjects without DSM-IV-TR diagnosis of BPD. Results: 45 subjects had ADHD; 21, BPD and; 7 had lifetime DSM-IV-TR diagnosis of ADHD + BPD. 13.5% of ADHD subjects had comorbid BPD and 25% of BPD subjects had comorbid ADHD. ADHD-CT was the most common subtype of ADHD. Nearly two third of BPD subjects had their first mood episode before 13 years of age. ADHD + BPD subjects were more likely to be mentally retarded and have longer duration of mood episode compared to BPD subjects. Three subjects with DSM-IV-TR diagnosis of ADHD without BPD were additionally diagnosed with broad phenotype of BPD. Conclusions: Variable comorbidity rates of ADHD + BPD in different studies are most likely due to differences in study setting, study sample, conceptualization of BPD and assessment methods. (C) 2013 Elsevier B.V. All rights reserved.