›› 2011, Vol. 6 ›› Issue (12): 954-959.

• 论著 • 上一篇    下一篇

临界关闭压对高血压大鼠脑血流的调控作用

高庆春1,卢林2,李振东3,傅贤1,梁兵1,李现亮1,张波1,黄楚明1,曾进胜4,黄如训4   

  1. 1广东省广州市广州医学院第二附属医院神经内科2山东省立医院神经内科3中山大学第三附属医院神经内科4中山大学第一附属医院神经内科
  • 收稿日期:2011-08-12 修回日期:2011-07-12 出版日期:2011-12-20 发布日期:2011-12-20
  • 通讯作者: 高庆春

Role of Critical Closing Pressure on Cerebral Blood Regulation on Rats

GAO Qing-Chun, LU Lin, LI Zhen-Dong, et al   

  • Received:2011-08-12 Revised:2011-07-12 Online:2011-12-20 Published:2011-12-20
  • Contact: GAO Qing-Chun

摘要: 目的 探讨临界关闭压(critical closing pressure,CCP)对肾血管性高血压大鼠(renovascular hypertensive rats,RHR)脑血流动力学改变的调控作用。方法 RHR模型(RHR组)26只,假手术正常血压对照组24只,同步记录大脑中动脉血流速度(cerebral blood flow velocity,CBFV)和有创血压,按照CCP理论计算CCP和小动脉阻力,并分析血流动力学参数之间,以及血流动力学参数与血管形态参数改变间的关系。结果 与对照组比较,RHR组动脉血压明显升高的同时,脑循环有效灌注压(effective cerebral perfusion pressure,CPPe)和血管面积阻力指数(resistance area product,RAP)明显升高(CPPe:100.80±26.40 mmHg vs 67.30±13.10 mmHg,P<0.01;RAP:2.94±0.85 vs 2.30±0.59,P=0.003),但CBFV相对稳定,脑循环阻力(cerebral vascular resistance,CVR)升高不明显。RHR组血管面积阻力指数(resistance area product,RAP)只与小动脉管腔内径呈负相关(rs=-0.610,P=0.001),CCP与小动脉中膜厚度呈正相关(rs=0.554,P=0.006);而CVR不仅与小动脉管腔内径呈负相关(rs=-0.463,P=0.023),也与小动脉中膜厚度呈正相关(rs=0.678,P<0.01)。结论 RHR的脑血流调控可通过CCP和RAP的改变来完成,用CCP和RAP代替CVR,能更加真实、客观地反映脑血流动力学的调控机制。

关键词: 高血压; 肾性; 局部血流; 临界关闭压

Abstract: Objective To validate the role of the model of critical closing pressure(CCP) on cerebral blood regulation.Methods After renovascular hypertensive rats(RHR) were made, the cerebral blood flow velocity(CBFV) and artery blood pressure were monitored simultaneously. The values of CCP and arteriolar resistance were worked out according to CCP theory. The difference of indexes between RHR and control were compared. The relationship between hemodynamics parameters and the association between hemodynamics and arteriolar morphological indexes were evaluated.Results The effective cerebral perfusion pressure(CPPe) and resistance-area product(RAP) in RHR(100.8±26.4 mmHg, 2.94±0.85) increase more following artery blood pressure rising, compared with those in control(67.3±13.1 mmHg, 2.30±0.59)(P<0.001, P=0.003), while CBFV is steady and cerebral vascular resistance(CVR) increase slightly. RAP correlates with arteriolar luminal radius negatively(rs=-0.610, P=0.001) and CCP associates with arteriolar media thickness positively(rs=0.554, P=0.006) whilst CVR has both correlations with luminal radius(rs=-0.463, P=0.023) and media thickness(rs=0.678, P=0.000).Conclusion The cerebral blood regulation on rats can be more effectively evaluated by dynamic adjusting of CCP and RAP comparing with CVR.

Key words: Hypertension; renal; Regional blood flow; Critical closing pressure