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腹型肥胖对社区人群无症状性颅内动脉狭窄的影响及其相关机制

Role of abdominal obesity in asymptonmatic intracranial arterial stenosis: a community-based study

摘要:

目的 研究腹型肥胖与颅内动脉狭窄的关系及机制. 方法 2008年10月从广东省佛山市整群抽取社区汉族成年居民1405名,其中1035名符合标准入选为研究对象.测量身高、体重、腰围、臀围和血压,记录病史,检测血糖、甘油三酯、总胆固醇.镉还原法检测血浆一氧化氮(NO).TCD诊断大脑中动脉狭窄(MCAS).采用SPSS 11.0软件统计分析. 结果 66名(6.4%)研究对象存在MCAS.单因素分析提示,高血压,缺血性心脏病史、收缩压、舒张压升高是MCAS的危险因素,腰臀比是男性人群MCAS的危险因素.回归分析提示高血压病史是男性和女性人群MCAS的独立危险因素(P=0.011,P=0.009),腰臀比是男性人群MCAS的独立危险因素(P=0.030).在男性和年龄>55岁的女性,较高腰臀比者具有较高NO水平,差异具有统计学意义(P=0.042;P=0.016);在年龄<55岁的女性中,不同腰臀比者NO水平差异无统计学意义(P=0.228). 结论 高血压和腹型肥胖是颅内动脉狭窄的重要危险因素.内皮功能紊乱和氧化应激水平的升高,可能是腹型肥胖导致颅内动脉狭窄的病理机制.雌激素对腹型肥胖致颅内动脉狭窄具有保护作用.

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abstracts:

Objective To investigate the relationship between abdominal obesity and intracranial artery stenosis and the underlying mechanism. Methods By cluster sampling, 1405 adult Han people were selected from the residential communities. Among them, 1035 people conformed to the inclusion criteria. Medical history was documented and body height, body weight,waist circumference, hip circumference and blood pressure were measured. Venous blood samples were collected to detect the serum concentrations of fasting glucose, total cholesterol and triglycerides. Serum nitric oxide (NO) level was determined by cadmium reduction method. Middle cerebral artery stenosis (MCAS) was diagnosed by transcranial Doppler. The SPSS 11.0 software package was used for data analysis. Results MCA stenosis was found in 66 subjects (6.4%). Univariate analysis showed history of hypertension, history of ischemic heart disease, systolic blood pressure and diastolic blood pressure were the risk factors for MCAS and waist-to-hip ratio (WHR) was a risk factor only in males. Logistic regression demonstrated history of hypertension was an independent risk factor for MCAS beth in males and females (P =0.011, P =0.009) and WHR for MCAS only in males (P = 0.030). Among males and females over 55 years old, the NO levels were higher in people with a higher WHR and the difference was statistically significant (P = 0.042, P = 0.016) ; however the NO levels for people with a varying WHR showed statistically insignificant difference among females under 55 years old (P = 0.228). Conclusion Hypertension and abdominal obesity are important risk factors for MCAS. Endothelial cell dysfunction and an elevated level of oxidative stress may be involved in the atherogenetic mechanism of abdominal obesity while estrogen may play a protective role in it.

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