title: [Effect of acute hemorrhage on cognitive function of aged spontaneously hypertensive rats].
abstract: OBJECTIVE
  To investigate the effect of acute blood loss on postoperative cognitive function of aged spontaneously hypertensive rats (SHRs).
  
  
  METHODS
  Forty aged male SHRs were randomized into sham hemorrhage group (group A, n=13), 20% hemorrhage group (group B, n=13) and 40% hemorrhage group (group C, n=14). The rats were subjected to acute loss from the femoral artery and subsequent fluid replacement with lactated Ringer's Solution (3 folds of the blood loss volume). All the rats underwent Morris water maze test to assess the visuospatial memory and learning ability, and were then decapitated to observe the pathological changes of the hippocampus.
  
  
  RESULTS
  The latency of reference memory in group C was significantly prolonged after the operation (P=0.002), but the working memory and learning capacity showed no significant differences between the 3 groups. Immunochemistry did not reveal significant differences in p-CREB expressions in the hippocampal CA1 region among the groups, but volume reduction of some neurons was noted in the CA1 region in group C.
  
  
  CONCLUSIONS
  Varying degrees of acute hemorrhage can result in different effect on postoperative cognition in aged SHR. Acute hemodilutional anemia to 40% of baseline can cause reference memory impairment with cell volume reduction of the neurons in the hippocampal CA1 region but does not affect the working memory and learning capacity or p-CREB expression.
authors.affiliation: Department of Anesthesiology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou 510080, China.E-mail: lelesl@sohu.com.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Sun
authors.forename: Dongnan
authors.initials: D
authors.lastname: Yu
authors.forename: Yong
authors.initials: Y
authors.lastname: Zheng
authors.forename: Zhifang
authors.initials: Z
authors.lastname: Yang
authors.forename: Guodong
authors.initials: G
authors.lastname: Zhao
mesh_terms: D000818:Animals; D056547:CA1 Region, Hippocampal / Q000166:cytology / Q000378:metabolism; D003071:Cognition; D017362:Cyclic AMP Response Element-Binding Protein / Q000378:metabolism; D006470:Hemorrhage / Q000503:physiopathology*; D008297:Male; D018782:Maze Learning; D008568:Memory; D009474:Neurons / Q000473:pathology; D051381:Rats; D011918:Rats, Inbred SHR
chemical_list: D017362:Cyclic AMP Response Element-Binding Protein