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随着医疗保健服务水平的提高和城乡居民膳食结构及生活方式的改变，疾病谱发生了变化，心血管疾病是当今威胁人类健康的主要疾病。研究表明我国心血管疾病发病率有逐年上升趋势，据我国1991年高血压普查结果，高血压患病率为11卫6％，较1979年高血压患病率升高25％（’）。因此
With the improvement of health service level and the change of dietary structure and lifestyle of urban and rural residents, the spectrum of diseases has changed. Cardiovascular diseases are the major diseases that threaten human health. Studies have shown that the incidence of cardiovascular disease in our country has been increasing year by year. According to the results of the 1991 hypertension survey in China, the prevalence of hypertension is 11% and 6%, higher than the prevalence of hypertension in 1979 by 25% (). therefore