title: Gray matter volumes and treatment response of psychotic symptoms to risperidone in antipsychotic-naïve Alzheimer's disease patients.
abstract: OBJECTIVE
  The purpose of this study was to determine whether gray matter volumes are associated with treatment response of psychotic symptoms in Alzheimer's disease (AD) patients.
  
  
  METHODS
  Risperidone, which is commonly used as an atypical antipsychotic drug, was administered in a clinical setting for 6 weeks from April 2012 to February 2013 to 25 antipsychotic-naïve AD patients with psychosis, diagnosed according to Jeste and Finkel's proposed diagnostic criteria for psychosis of Alzheimer's disease. Psychotic symptoms were rated with the Korean version of the Neuropsychiatric Inventory (K-NPI) at baseline and at 6 weeks, and treatment response was defined as the change in K-NPI score from baseline to 6 weeks. Gray matter volumes were measured with magnetic resonance imaging and voxel-based morphometry at baseline. Age, gender, years of education, total intracranial volume, apolipoprotein E genotype, dosage of risperidone, the baseline scores on the Korean version of the Mini-Mental State Examination, and the baseline psychotic and nonpsychotic symptoms scores on the K-NPI were measured as covariates of no interest.
  
  
  RESULTS
  We found that treatment response of psychotic symptoms to risperidone in antipsychotic-naïve AD patients was positively associated with both left and right putamina, left parahippocampal gyrus, and left amygdala volume after controlling covariates of no interest (uncorrected P < .001, KE > 100 voxels).
  
  
  CONCLUSIONS
  Therefore, we conclude that gray matter volumes of putamina, left parahippocampal gyrus, and left amygdala are associated with treatment response of psychotic symptoms after 6 weeks of treatment with risperidone in antipsychotic-naïve AD patients with psychosis. These results suggest that the volumes of specific gray matter regions probably contribute to treatment response of psychotic symptoms in AD patients.
  
  
  BACKGROUND
  ClinicalTrials.gov identifier: NCT01198093.
authors: Departments of Psychiatry and Biomedical Research Institute, Pusan National University Hospital, Busan, Korea.
authors: Young-Min
authors: YM
authors: Lee
authors: Je-Min
authors: JM
authors: Park
authors: Byung-Dae
authors: BD
authors: Lee
authors: Eunsoo
authors: E
authors: Moon
authors: Hee-Jeong
authors: HJ
authors: Jeong
authors: Young-In
authors: YI
authors: Chung
authors: Ji-Hoon
authors: JH
authors: Kim
authors: Hak-Jin
authors: HJ
authors: Kim
authors: Chi-Woong
authors: CW
authors: Mun
authors: Tae-Hyung
authors: TH
authors: Kim
authors: Young-Hoon
authors: YH
authors: Kim
mesh_terms: D000368:Aged; D000544:Alzheimer Disease / Q000150:complications / Q000188:drug therapy* / Q000473:pathology* / Q000523:psychology; D000679:Amygdala / Q000473:pathology; D014150:Antipsychotic Agents / Q000627:therapeutic use; D005260:Female; D066128:Gray Matter / Q000187:drug effects* / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D059906:Neuroimaging; D020534:Parahippocampal Gyrus / Q000473:pathology; D011618:Psychotic Disorders / Q000150:complications / Q000188:drug therapy* / Q000523:psychology; D011699:Putamen / Q000473:pathology; D018967:Risperidone / Q000627:therapeutic use*; D016896:Treatment Outcome
chemical_list: D014150:Antipsychotic Agents; D018967:Risperidone