title: Hippocampal volume and depression: a meta-analysis of MRI studies.
abstract: OBJECTIVE
  Several studies have found reduced hippocampal volume in patients with unipolar depression, but discrepancies exist. The authors performed a systematic review and meta-analysis of volumetric studies of the hippocampus in patients with mood disorders.
  
  
  METHODS
  Studies of hippocampal volume in unipolar and bipolar patients were identified. A meta-analysis of the 12 studies of unipolar depression fulfilling specific criteria was performed. The sample comprised 351 patients and 279 healthy subjects.
  
  
  RESULTS
  The studies were highly heterogeneous regarding age and gender distribution, age at onset of the disorder, average number of episodes, and responsiveness to treatment, but the pooled effect size of depression was significant in both hemispheres for the unipolar patients. The weighted average showed a reduction of hippocampal volume of 8% on the left side and 10% on the right side. The causes of the heterogeneity were analyzed, and a meta-regression showed that the total number of depressive episodes was significantly correlated to right but not left hippocampal volume reduction.
  
  
  CONCLUSIONS
  Hippocampal volume is reduced in patients with unipolar depression, maybe as a consequence of repeated periods of major depressive disorder. Bipolar patients did not seem to show a reduction in hippocampal volume, but this has been much less investigated.
authors.affiliation: Institute for Basic Psychiatric Research, Department of Biological Psychiatry, Psychiatric Hospital, Aarhus University Hospital, DK-8240 Risskov, Denmark. videbech@dadlnet.dk
authors.forename: Poul
authors.initials: P
authors.lastname: Videbech
authors.forename: Barbara
authors.initials: B
authors.lastname: Ravnkilde
mesh_terms: D000328:Adult; D000367:Age Factors; D017668:Age of Onset; D000368:Aged; D001714:Bipolar Disorder / Q000175:diagnosis; D003866:Depressive Disorder / Q000175:diagnosis*; D005260:Female; D007839:Functional Laterality; D006624:Hippocampus / Q000033:anatomy & histology*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000706:statistics & numerical data*; D008297:Male; D008875:Middle Aged; D012737:Sex Factors