title: [Attention deficit hyperactivity syndrome].
abstract: BACKGROUND
  Attention deficit/hyperactivity disorder (ADHD) is an early onset childhood condition that is estimated to occur in 7-10 % of school age children.
  
  
  METHODS
  There are two specific syndromes: a) Attention deficit disorder, without hyperactivity; b) A more complex syndrome, with hyperactivity, with traits of impulsivity, accompanied by attention deficit disorder. The etiology of this syndrome is still unclear, but there have been some hypothesis about hypoperfused areas in the frontal lobe, in some patients where PET has been available. There have been also some response to stimulants; which leads to the conclusion that there is some relation with neurotransmitters like noradrenaline and dopamine, as a determinant factor in the origin of this process. Among 80% of children with this diagnosis, respond positively to the use of psychostimulants. Although, there are some cases that respond poorly, which are evaluated in this review.
  
  
  CONCLUSIONS
  This article also highlights the importance of multidisciplinary assessment, in the diagnosis and treatment of these cases. It gives a clinical characterization of the syndrome, following DSM IV guidelines. Finally, it addresses, the use of non stimulant drugs, that can be helpful in the treatment of this disorder.
authors.affiliation: Servicio de Neuropediatría, Hospital Nacional de Niños, San José, Costa Rica. sellma@racsa.co.cr
authors.forename: F
authors.initials: F
authors.lastname: Sell-Salazar
mesh_terms: D001289:Attention Deficit Disorder with Hyperactivity / Q000150:complications / Q000175:diagnosis / Q000628:therapy; D002648:Child; D006801:Humans