title: Weight gain during treatment of bipolar I patients with olanzapine.
abstract: BACKGROUND
  Body weight increase during long-term treatment with olanzapine in schizophrenia patients is well documented, but weight gain and its association with other medical measures are less well evaluated in bipolar disorder patients.
  
  
  METHODS
  We analyzed data from a 3-week, randomized, placebo-controlled trial of olanzapine for acute mania in DSM-IV bipolar I patients, followed by open continuation treatment with olanzapine up to a year. We examined factors associated with increased body mass index (BMI), including ratings of clinical change and selected physiologic measures.
  
  
  RESULTS
  Among 113 subjects treated with olanzapine for a mean +/- SD of 28.6 +/- 19.9 weeks, BMI increased from a baseline mean of 28.8 +/- 6.2 kg/m(2), by 7.9 +/- 10.8% (p < .001), into the obese range (31.0 +/- 6.1 kg/m(2)). Initial BMI change (first 3 weeks of drug exposure) predicted final BMI increases (Spearman rank correlation r(s) = 0.32, p < .001). History of longer illness (p = .006) and lifetime substance abuse (p = .02) were associated with below-median BMI increases. BMI increased much more among 40 subjects achieving symptomatic recovery than in the 73 who did not (by 11.9 +/- 13.2% vs. 5.3 +/- 7.7%; p = .004), with correspondingly longer olanzapine exposure (44.7 +/- 11.8 vs. 19.7 +/- 17.7 weeks; p < .001) at similar doses. On average, serum cholesterol increased 4.8 times more (17.5% vs. 3.6%) and endpoint cholesterol levels were newly 240 mg/dL or greater 3.6 (95% CI = 1.5 to 8.0) times more frequently in subjects with above-median BMI gain, who also experienced significantly larger increases in systolic and diastolic blood pressure, pulse rates, and nonfasting serum glucose than low-BMI-gain subjects.
  
  
  CONCLUSIONS
  Weight gain associated with long-term olanzapine treatment for mania was common, substantial, time-dependent, predicted by initial increases, and temporally associated with significant changes in cardiovascular and metabolic measures in bipolar I patients with prolonged illness and already-high basal BMI. An association of weight gain with favorable clinical response probably reflects longer olanzapine treatment.
authors.affiliation: Department of Psychiatry, Harvard Medical School, Boston, MA, USA. jhennen@mclean.org
authors.forename: John
authors.initials: J
authors.lastname: Hennen
authors.forename: Roy H
authors.initials: RH
authors.lastname: Perlis
authors.forename: Gary
authors.initials: G
authors.lastname: Sachs
authors.forename: Mauricio
authors.initials: M
authors.lastname: Tohen
authors.forename: Ross J
authors.initials: RJ
authors.lastname: Baldessarini
mesh_terms: D000328:Adult; D014150:Antipsychotic Agents / Q000009:adverse effects* / Q000627:therapeutic use; D001569:Benzodiazepines / Q000009:adverse effects* / Q000627:therapeutic use; D001714:Bipolar Disorder / Q000175:diagnosis / Q000188:drug therapy*; D001786:Blood Glucose / Q000032:analysis / Q000187:drug effects; D001794:Blood Pressure / Q000187:drug effects / Q000502:physiology; D015992:Body Mass Index; D002784:Cholesterol / Q000097:blood; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D009765:Obesity / Q000139:chemically induced*; D000077152:Olanzapine; D011569:Psychiatric Status Rating Scales; D011674:Pulse / Q000706:statistics & numerical data; D016896:Treatment Outcome; D015430:Weight Gain / Q000187:drug effects
chemical_list: D014150:Antipsychotic Agents; D001786:Blood Glucose; D001569:Benzodiazepines; D002784:Cholesterol; D000077152:Olanzapine