title: [Effects of high thoracic epidural anesthesia on ventricular remodeling and expression of beta(3)-adrenoceptor in rats with heart failure induced by acute myocardial infarction].
abstract: OBJECTIVE
  To investigate the effect of high thoracic epidural anesthesia on ventricular remodeling and cardiac function in rats with heart failure induced by myocardial infarction, and to investigate their mechanism.
  
  
  METHODS
  Rats that had been established successively model were randomly divided into S group (n = 12), HTEA group and CHF group (24/group). 9.0 g/L normal sodium 100 microl/kg was injected to epidural cavity twice a day separately in group S and group CHF. 1.25 g/L bupivacaine 100 microl/kg was injected to epidural cavity twice a day in group HTEA. Epidural injection was started 24 hrs after the epidural surgery and continued 4 weeks. Then the change of cardiac function was observed by using echocardiogram. The ratio of heart weight to body weight (HW/BW) and the ratio of left ventricular weight to body weight (LVW/BW) were measured. Noninfarct ventricular tissue were stained with hematoxylin-eosin (HE) and Masson's trichrome respectively. beta(3)-adrenoceptor levels and eNOS levels were detected with reverse transcription-polymerase chain reaction (RT-PCR) and immunohistochemistry.
  
  
  RESULTS
  LVEDD and LVESD were significantly decreased in the group HTEA compared with group CHF (P < 0.01), while LVEF% and LVFS% were significantly increased (P < 0.01). The ratios HW/BW and LVW/BW were significantly increase in the group CHF compared with the group S (P < 0.01), but they were limited in the group HTEA (P < 0.01). Hypertrophy and edema, degeneration and necrosis of myocytes can be seen in rats with CHF, as well as muscle fibers disruption and collagen fiber increase, while the pathological amorphous were attenuated in HTEA rats. beta(3)AR and eNOS mRNA levels were significantly decreased in the group THEA compared with the group CHF.
  
  
  CONCLUSIONS
  These results indicate that HTEA could ameliorate ventricular remodeling and cardiac function in rats with heart failure induced by myocardial infarction. The mechanism could involve decreases of beta(3)AR expression in rats of heart failure.
authors.affiliation: Department of Anesthesiology, Fuzhou General Hospital of Nanjing Military Command, Fuzhou 350025, China. Email: cgzssq2000@sina.com.
authors.forename: Guo-zhong
authors.initials: GZ
authors.lastname: Chen
authors.forename: Qing-xiang
authors.initials: QX
authors.lastname: Wang
authors.forename: Xiao-zhi
authors.initials: XZ
authors.lastname: Wu
authors.forename: Ren
authors.initials: R
authors.lastname: Liu
authors.forename: He-qun
authors.initials: HQ
authors.lastname: Jiang
mesh_terms: D015360:Analgesia, Epidural; D000818:Animals; D006333:Heart Failure / Q000209:etiology / Q000378:metabolism* / Q000503:physiopathology; D008297:Male; D009203:Myocardial Infarction / Q000150:complications / Q000378:metabolism* / Q000503:physiopathology; D009407:Nerve Block / Q000379:methods; D051381:Rats; D017208:Rats, Wistar; D022702:Receptors, Adrenergic, beta-3 / Q000378:metabolism*; D020257:Ventricular Remodeling
chemical_list: D022702:Receptors, Adrenergic, beta-3