All definitional requirements for Transtorno de déficit de atenção e hiperatividade are met and hyperactive-impulsive symptoms are predominant in the clinical presentation. Hyperactivity refers to excessive motor activity and difficulties com remaining still, most evident in structured situations that require behavioural self-control. Impulsivity is a tendency to act in response to immediate stimuli, sem deliberation or consideration of the risks and consequences. Some inattentive symptoms may also be present, but these are not clinically significant in relation to the hyperactive-impulsive symptoms.