title: Proximal occlusion of the middle cerebral artery in C57Black6 mice: relationship of patency of the posterior communicating artery, infarct evolution, and animal survival.
abstract: OBJECTIVE
  The intraluminal suture model for focal cerebral ischemia is increasingly used, but not without problems. It causes hypothalamic injury, subarachnoid hemorrhage, and inadvertent premature reperfusion. The patency of the posterior communicating artery (PCoA) potentially affects the size of the infarct. In addition, survival at 1 week is unstable. The authors operated on C57Black6 mice to produce proximal middle cerebral artery occlusion (MCAO) so that drawbacks with the suture model could be circumvented.
  
  
  METHODS
  The MCA segment just proximal to the olfactory branch was occluded either permanently or temporarily. After 1 hour of MCAO the infarct volume was significantly smaller than that found after 2 hours or in instances of permanent MCAO. The differences were assessed at 24 hours and 7 days after surgery (p < 0.05 and p < 0.001, respectively). The patency of the PCoA, as visualized using carbon black solution, did not correlate with the infarct size. Neurologically, the 1- and 2-hour MCAO groups displayed significantly less severe deficits than the permanent MCAO group on Days 1, 4, and 7 (p < 0.005 and p < 0.01, respectively). Although the infarct size, neurological deficits, and body weight loss were more severe in the permanent MCAO group, the survival rate at Day 7 was 80%.
  
  
  CONCLUSIONS
  This model provides not only a robust infarct size (which is not affected by the patency of the PCoA), but also a better survival rate.
authors.affiliation: Department of Neurosurgery, Faculty of Medicine, University of Tokyo and University Hospital, Tokyo, Japan. furuya-nsu@umin.ac.jp
authors.forename: Kazuhide
authors.initials: K
authors.lastname: Furuya
authors.forename: Nobutaka
authors.initials: N
authors.lastname: Kawahara
authors.forename: Kensuke
authors.initials: K
authors.lastname: Kawai
authors.forename: Tomikatsu
authors.initials: T
authors.lastname: Toyoda
authors.forename: Keiichiro
authors.initials: K
authors.lastname: Maeda
authors.forename: Takaaki
authors.initials: T
authors.lastname: Kirino
mesh_terms: D000818:Animals; D001835:Body Weight; D002560:Cerebrovascular Circulation; D020244:Infarction, Middle Cerebral Artery / Q000401:mortality / Q000473:pathology / Q000503:physiopathology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009460:Neurologic Examination; D020769:Posterior Cerebral Artery / Q000473:pathology / Q000502:physiology*; D015996:Survival Rate