Chapter 10: Depressive and Bipolar Disorders

Major Depressive Disorder in youth involves persistent depressed mood or anhedonia, though irritability frequently emerges as the primary symptom in younger populations rather than sadness as seen in adults. Persistent Depressive Disorder represents a chronic form of depression with lower severity that extends for at least one year in children. Disruptive Mood Dysregulation Disorder is distinguished as a separate childhood condition characterized by severe irritability and recurrent emotional outbursts, differing fundamentally from bipolar presentations. Bipolar Disorder in youth manifests through alternating manic, hypomanic, and depressive episodes with considerable variability and significant diagnostic challenges due to symptom overlap with attention deficit hyperactivity disorder and conduct disorders. The chapter examines four bipolar subtypes: Bipolar I, Bipolar II, Cyclothymic Disorder, and other specified presentations, noting that neuroimaging studies reveal structural brain differences in affected youth. Multiple risk factors contribute to these conditions, including genetic predisposition, neurotransmitter dysregulation involving dopamine and serotonin systems, cognitive distortions, poor emotion regulation capacity, family conflict, parental psychopathology, and early traumatic experiences. A critical concern highlighted throughout is suicidality, with substantial proportions of depressed adolescents engaging in self-harm and suicide attempts. Treatment modalities discussed include cognitive-behavioral therapy and interpersonal psychotherapy adapted for adolescents, which demonstrate effectiveness for depressive symptoms, alongside family-focused interventions that improve communication and emotional support systems. Pharmacological approaches utilizing selective serotonin reuptake inhibitors and mood stabilizers require careful monitoring due to increased suicidality risks and potential adverse effects, particularly during early treatment phases. The chapter emphasizes that early intervention and comprehensive multimodal treatment approaches substantially improve long-term outcomes and reduce episode recurrence in affected youth.