去窦弓神经大鼠体内血管舒/缩功能的测定  

In vivo detection of vascular systolic/relaxant function in sino-aortic denervated rats

作　　者：单琤琤[1] 戴生明[2] 苏定冯[2] 

机构地区：[1]第二军医大学附属长海医院儿科,上海200433 [2]第二军医大学基础部药理学教研室,上海200433

出　　处：《中国药理学通报》2002年第1期67-72,共6页Chinese Pharmacological Bulletin

摘　　要：目的　研究完全及部分去窦弓神经大鼠术后体内血管收缩 /舒张功能的改变。方法　用Sprague Dawley大鼠分别去除颈动脉窦神经 (SD)或主动脉神经支配 (AD) ,以及完全去除窦 弓神经支配 (SAD)。术后急性期 (1wk)、慢性期(18wk)在清醒、自由活动状态下分别测定动脉血压、心率及血压波动性、心率波动性。并分别测定上述大鼠ABR功能(ABR HP和ABR BP)。对术后 18wk的完全及部分去窦弓神经大鼠 ,通过静脉累积注射去氧肾上腺素以及硝普钠分别测定体内动脉收缩 /舒张功能。结果　术后 1wk ,SAD及AD大鼠动脉血压显著升高 ;术后 18wk ,SAD大鼠 2 4h血压平均值与对照假手术大鼠相比无差异 ,而AD大鼠血压仍较对照组明显升高。SD大鼠的血压、心率在术后 1wk及术后 18wk均无升高。术后 18wk ,SAD及AD大鼠 2 4h血压波动性较对照组大鼠升高。术后 1wk及 18wk的SAD大鼠ABR功能较对照组明显降低 ,AD大鼠ABR功能也低于对照组 ,而SD大鼠ABR功能与假手术大鼠间无差异性。术后 18wkSAD、AD和SD大鼠SBPmax(注射去氧肾上腺素后 )及DBPmin(注射硝普钠后 )较对照组大鼠均明显上升。完全及部分去窦弓神经大鼠的SBPmax和DBPmin分别与ABR功能呈负相关 ;SAD、AD及SD大鼠的ABR功能与血压波动性呈密切负相关。AIM To investigate the changes of vascular systiolic/relaxant function in sino-aortic denervated rats. METHODS Male Sprague-Dawley rats were underwent sino-aortic denervation (SAD). The sinoaortic denervated (SAD) rats were adopted as a model of arterial baroreflex deficit. SAD, isolated aortic-denervated (AD) and isolated sinus-denervated (SD) rats were instrumented chronically to record blood pressure (BP), heart rate (HR), BP variability (BPV), HR variability (HRV), arterial baroreflex function control of heart period (ABR-HP) and BP (ABR-BP). The vascular maximum contractile/relaxant function was determined through cumulative venous injection of phenylephrine (SBP max ) and nitroprusside(DBP min ) both after ganglionic blokade. RESULTS Acute SAD(1 week after operation) caused hypertension and tachycardia in rats. Eighteen weeks after operation, BP and HR values in SAD and SD rats were not different from those in sham-operated rats, but AD rats were hypertensive compared with control group. Though the 24 h mean BP values of chronic (18 weeks after operation) SAD rats was not different from those in the sham-operated rats, 24 h BPV of SAD rats was significantly higher when compared with sham-operated rats. ABR function in the acute SAD rats was significantly decreased when compared with sham-operated rats, whereas in chronic SAD rats, both ABR-HP and ABR-BP were higher than those in acute SAD rats, but were still significantly lower than those in control groups. 18 weeks after operation, ABR function in SAD and AD rats were significantly decreased when compared with those in SD and control groups. SBP max after phenylephrine and DBP min after nitroprusside were significantly higher in SAD, AD and SD rats than in control group. ABR function was negatively correlated to DBP min ( r =-0.677 for ABR-HP, and r =-0.681 for ABR-BP; P< 0.001) and SBP max ( r =-0.614 for ABR-HP, and r =-0.545 for ABR-BP; P< 0.001) in the whole group of the denervated rats ( n =44).ABR function of the sino-

关 键 词：去窦弓神经 动脉压力感受性反射 血管顺应性 大鼠 

分 类 号：R322.81[医药卫生—人体解剖和组织胚胎学] R331.3[医药卫生—基础医学]