方法：60例老年冠心病患者及68例正常对照组间的心功能参数及脑循环动力参数的比较。

Methods: Taking 60 cases of elder patients with coronary heart diseases and 68 normal cases as comparative group to see the parameters of heart function and cerebral circulation dynamics parameters.

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切换系统是由一组连续或离散动态子系统组成，并按某种切换规则在各子系统间切换的动力系统。

A switched system is a class of hybrid system composed of several dynamical Subsystems and a switching law that specifies the active subsystem at each instant of time.

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结果两组间各血流动力学指标比较差异均无统计学意义。

Results There was no significant difference in hemodynamics between the two groups.

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