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为分析老年脑梗死的危险因素，探讨无症状脑梗死之无症状的原因，采用病例对照研究的方法，以同期住院的３２例有症状的老年脑梗死患者为对照，观察３２例头颅ＣＴ确诊的老年无症状脑梗死患者的危险因素及ＣＴ特征。结果发现，无症状组与对照组相比各项危险因素差异无显著意义（Ｐ＞０．０５）；ＣＴ表现梗死范围两组间差异有非常显著意义（Ｐ＜０．０１），无症状组梗死灶小于１５ｍｍ者占９６．０８％，有症状组梗死灶大于１５ｍｍ者占７６．６０％，表明腔隙性脑梗死是导致老年无症状脑梗死的主要原因之一。
In order to analyze the risk factors of senile cerebral infarction and explore the causes of asymptomatic asymptomatic cerebral infarction, 32 cases of symptomatic senile cerebral infarction hospitalized in the same period were compared with the case-control study. Risk factors and CT features of elderly patients with asymptomatic cerebral infarction. The results showed that there was no significant difference in the risk factors between the asymptomatic group and the control group (P> 0.05). There was significant difference between the two groups (P <0.01) Cerebral infarction less than 15mm accounted for 96.08%, symptomatic group more than 15mm infarction accounted for 76.60%, indicating that lacunar infarction is one of the leading causes of senile asymptomatic cerebral infarction.