title: Effect on lipid profiles of switching from olanzapine to another second-generation antipsychotic agent in veterans with schizophrenia.
abstract: OBJECTIVE
  To compare (1) mean low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), and triglyceride differences after switching from olanzapine to quetiapine, risperidone, or ziprasidone and (2) the mean lipid change between switch patterns.
  
  
  METHODS
  Retrospective, naturalistic, nonequivalent control group design.
  
  
  METHODS
  United States between April 1, 2002, and September 30, 2002.
  
  
  METHODS
  1,826 U.S. Veterans Healthcare System enrollees with diagnoses of schizophrenia or schizoaffective disorders and receiving a second-generation antipsychotic (SGA) medication.
  
  
  METHODS
  Analysis of data from the Veterans Information Systems and Technology Architecture.
  
  
  METHODS
  Differences in LDL-C, HDL-C, and triglycerides and mean differences between switch patterns. Predictors were the type of switch (e.g., olanzapine to quetiapine) and switch patterns (e.g., olanzapine to quetiapine versus olanzapine to risperidone). Data were analyzed using Pearson's X2 and multivariate analysis of covariance with planned comparisons.
  
  
  RESULTS
  After adjusting for age, gender, and race/ethnicity, LDL-C decreased significantly among patients switched from olanzapine to ziprasidone (-16.9 mg/dL, P <0.01) and olanzapine to quetiapine (-7.6 mg/dL, P = 0.04) and trended upward in patients switched from olanzapine to risperidone (+6.6 mg/dL, P = 0.12). Triglyceride levels decreased among those switched from olanzapine to ziprasidone (-62.9 mg/dL, P <0.01) and olanzapine to risperidone (-48.5 mg/dL, P <0.01) but not among veterans switched from olanzapine to quetiapine (+7.8 mg/dL, P = 0.54). HDL-C levels did not change significantly when veterans were switched from olanzapine to quetiapine, risperidone, or ziprasidone.
  
  
  CONCLUSIONS
  Switching SGAs can increase or decrease cardiovascular risk depending on the clinician's follow-on SGA choice. LDL-C and triglyceride levels decreased significantly among veterans switched from olanzapine to ziprasidone. Switching to quetiapine was associated with a reduction in LDL-C, while switching to risperidone resulted in lower triglyceride levels. Clinicians should use these results when building a patient care plan that includes switching of SGAs.
authors.affiliation: College of Pharmacy, University of Florida, Gainesville, FL, USA.
authors.forename: Patrick M
authors.initials: PM
authors.lastname: Garman
authors.forename: L Douglas
authors.initials: LD
authors.lastname: Ried
authors.forename: Michael A
authors.initials: MA
authors.lastname: Bengtson
authors.forename: Chienning
authors.initials: C
authors.lastname: Hsu
authors.forename: Joel R
authors.initials: JR
authors.lastname: McConkey
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014150:Antipsychotic Agents / Q000627:therapeutic use*; D001569:Benzodiazepines / Q000627:therapeutic use; D008076:Cholesterol, HDL / Q000097:blood*; D008078:Cholesterol, LDL / Q000097:blood*; D003987:Dibenzothiazepines / Q000627:therapeutic use; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D000077152:Olanzapine; D010879:Piperazines / Q000627:therapeutic use; D000069348:Quetiapine Fumarate; D018967:Risperidone / Q000627:therapeutic use; D012559:Schizophrenia / Q000097:blood* / Q000188:drug therapy; D013844:Thiazoles / Q000627:therapeutic use; D014280:Triglycerides / Q000097:blood*; D014728:Veterans
chemical_list: D014150:Antipsychotic Agents; D008076:Cholesterol, HDL; D008078:Cholesterol, LDL; D003987:Dibenzothiazepines; D010879:Piperazines; D013844:Thiazoles; D014280:Triglycerides; D001569:Benzodiazepines; D000069348:Quetiapine Fumarate; C092292:ziprasidone; D018967:Risperidone; D000077152:Olanzapine