Objective:To investigate the relationship between body mass index(BMI)and parameters from 24h ambulatory blood pressure monitoring (ABPM) in patients with primary hypertension.Methods:176 patients with primary hypertension were divided into three groups ,the normal group (n=79) ,the overweight group (n=75) and the obesity group (n=22).All the patients was carried out 24h ABPM. Then evaluate the parameters from 24h ABPM and the rhythm of blood pleasure during day and night.Results:The 24h mean blood pressure,mean nocturnal blood pressure, mean diurnal blood pressure, mean diurnal pulse pressure in overweight and obesity groups were higher than normal group(P<0.01);The cases with no circadian rhythm take a main percent of overweight and obesity groups (P<0.05). Conclusion:There was significantly relationship between BMI and parameters from 24h ABPM in patients with primary hypertension. 24-h ABPM is very important to measure and judge curative effect for overweight and obesity patients with primary hypertension.%目的：探讨原发性高血压患者动态血压指标与体重指数的关系。方法：依据体重指数将原发性高血压患者行动态血压监测者分为正常体重组(79例)、超重组(75例)和肥胖组(22例)。分析体重指数与动态血压指标及血压昼夜节律的关系。结果：超重组及肥胖组患者24小时、白昼和夜间的平均收缩压/舒张压、夜间平均脉压水平以及血压昼夜节律异常发生率均高于正常体重组，有显著性差异(P<0.05～0.01)。结论：动态血压指标与原发性高血压患者体重指数之间有密切的关系；超重及肥胖的高血压患者应用动态血压监测和判定其预后具有重要的意义。
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