title: Proposed definitions of bipolar I disorder episodes and daily rapid cycling phenomena in preschoolers, school-aged children, adolescents, and adults.
abstract: OBJECTIVE
  Recent data from several large studies of pediatric bipolar I disorder reported baseline (current) episode duration ranging from less than a month to >or=1 year. These data may reflect actual sample differences, but the absence of uniformly applied definitions of episode duration, number of lifetime episodes and daily rapid cycling patterns during episodes may also account for these differences.
  
  
  METHODS
  Proposals for definitions of episode and cycling phenomena were based upon data from the Washington University in St. Louis Kiddie Schedule for Affective Disorders and Schizophrenia (WASH-U-KSADS).
  
  
  RESULTS
  Episode would be used for the interval between onset and offset of full DSM-IV criteria for bipolar I disorder. Cycling would be used only to describe daily (ultradian) switching of mood states that occurs during an episode.
  
  
  CONCLUSIONS
  Historically, in the adult bipolar literature the words "episode" and "cycle" were used interchangeably. "Rapid cycling," in this earlier literature, actually referred to multiple episodes per year. To avoid confusing episodes with daily cycling, the proposal is to use "episode" for the duration of DSM-IV criteria, to use "cycling" for daily switching phenomena during an episode, and to replace the historical term "rapid cycling" with "multiple episodes per year." These clarifications will be especially important for phenomenological research on preschool populations.
authors.affiliation: Washington University School of Medicine, Department of Psychiatry, St. Louis, Missouri 63110, USA. gellerb@medicine.wustl.edu
authors.forename: Barbara
authors.initials: B
authors.lastname: Geller
authors.forename: Rebecca
authors.initials: R
authors.lastname: Tillman
authors.forename: Kristine
authors.initials: K
authors.lastname: Bolhofner
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001714:Bipolar Disorder / Q000145:classification* / Q000523:psychology; D002648:Child; D002675:Child, Preschool; D006801:Humans; D010507:Periodicity; D012008:Recurrence; D012075:Remission, Spontaneous; D009626:Terminology as Topic