结论：老年冠心病患者由于动脉硬化，对硝酸甘油扩张脑血管作用不敏感，而硝酸甘油致偏头痛时有局部的脑血管扩张，脑血流量增加。

• As a result of arteriosclerosis,Nitroglycerine did't dilate brain blood vessel of senile coronary heart disease patients,But can dilate local brain blood vessel of drug headache patients,and increase cerebral blood flow of them.