Attention deficit hyperactivity disorder is seen in?

ADHD: Attention Deficit Hyperactivity Disorder. Difficulty in paying attention, difficulty in controlling behavior and hyperactivity. Etiology- both genetic and environmental factors. Abnormality in dopamine transpoer and thyroid receptor beta genes in some patients. Three subtypes are known: 1. Predominantly hyperactive-impulsive 2. Predominantly inattentive 3. Combined hyperactive-impulsive and inattentive. Diagnosis is primarily clinical, using thorough clinical interview of parents and use of behavior rating scales. Physical examination includes direct observation of the child and ruling out chronic systemic illnesses that affect child&;s attention span. Reference: GHAI Essential pediatrics, 8th edition