氯沙坦对高血压病患者心率变异性影响的研究

Effects of Losartan on Heart Rate Variability of Essential Hypertensive Patients

目的 :探讨氯沙坦对高血压病患者心率变异性的影响。方法 :分别对50例健康查体者及90例高血压病患者口服氯沙坦治疗前、后行24小时动态心电图检查 ,分析心率功率谱时域和频域指标。结果 :高血压病患者用药前和用药后相邻正常RR间期标准差(SDNN )、RR间期平均值的标准差 (SDANN )、高频功率和总功率、低频功率、低频功率/高频功率值分别显著低于和高于正常对照组 ,高血压病患者治疗前、后上述指标亦呈显著变化。Ⅲ期高血压病患者的SDNN、高频功率、低频功率及低频功率/高频功率值与Ⅱ期高血压病患者比较 ,P<0 05 ;Ⅱ期高血压病患者的SDNN、高频功率、低频功率及低频功率/高频功率值与Ⅰ期高血压病患者比较 ,P<0 05 ,显示植物神经功能损害与病情呈正相关。各期高血压病患者在经氯沙坦治疗后血压有效下降的同时 ,心率变异性损害均有改善。结论 :氯沙坦在降压治疗的同时 。

OBJECTIVE:To study the effect of losartan on heart rate variability of essential hypertensive patientsMETHO_DS:The heart rate power spectral density and time-domain in 24-hour dynamic EKG were analyzed in 50 healthy subjects and in 90 patients with hypertension before and after giving losartanRESULTS:The low frequency and total frequency and ratio between low frequency and high frequency of hypertensive patients were significantly higher than those of controls,the high frequency and standard deviation of normal-to-normal intervals(SDNN) and standard deviation of the average of RR intervals(SDANN) for each five-minute period of the 24-hour eletrocardiographic recordings were significantly lower than those of controlsThe SDNN and high frequency of grade Ⅲ hypertension were significantly lower than those of grade Ⅱ hypertensionThe low frequency and ratio between low frequency and high frequency of grade Ⅲ hypertension were significantly higher than those of grade Ⅱ hypertension,and so were the grade Ⅱ than those of the grade Ⅰ It showed that vegetative nerve functi_onal damage was positively related with hypertensive gradeThe severer the illness,the greater the changeAfter losartan treatment,in addition to lowing the blood pressure,the SDNN,SDANN and high frequency of hypertensive patients were significantly increasedThe low frequency,total frequency and ratio between low frequency and high frequency of hypertensive patients were significantly decreasedCONCLUSION:When losartan lowers blood pressure,it can significantly improve the heart rate variability of essential hypertensive patients