Heart rate variability(HRV) analysis is affected by ectopic beats.An efficient method was proposed to deal with the ectopic beats.The method was based on trend correlation of the heart timing signal.Predictor of R-R i...Heart rate variability(HRV) analysis is affected by ectopic beats.An efficient method was proposed to deal with the ectopic beats.The method was based on trend correlation of the heart timing signal.Predictor of R-R interval(RRI) value at ectopic beat time was constructed by the weight calculation and the slope estimation of preceding normal RRI.The type of ectopic beat was detected and replaced by the predictor of RRI.The performance of the simulated signal after ectopic correction was tested by the standard value using power spectrum density(PSD) estimation,whereas the results of clinical data with ectopic beats were compared with the adjacent ectopic-free data.The result showed the frequency indexes after ectopy corrected had less error than other methods with the test of simulated signal and clinical data.It indicated our method could improve the PSD estimation in HRV analysis.The method had advantages of high accuracy and real time properties to recover the sinus node modulation.展开更多
Objective：To observe the effect of combined therapy with Xuezhikang Capsule（血脂康胶囊,XZK） and Valsartan on left ventricular hypertrophy（LVH） and heart rate turbulence（HRT） in hypertensive patients. Methods：N...Objective：To observe the effect of combined therapy with Xuezhikang Capsule（血脂康胶囊,XZK） and Valsartan on left ventricular hypertrophy（LVH） and heart rate turbulence（HRT） in hypertensive patients. Methods：Ninety primary hypertensive patients with LVH were randomly assigned to three groups.Basic treatment,including aspirin,β-blockers,calcium antagonists,etc.were administered to all patients.Additionally, Valsartan（VS,80 mg once a day） was given to the 30 patients in the VS group.Valsartan（in the same dosage） and XZK（600 mg,twice a day） were given to the 32 patients in the Chinese medicine（CM） group,while none was given to the 28 patients in the control group.The therapeutic course lasted for 24 months.Changes in left ventricular mass index（LVMI） measured by cardiac ultrasonic indices,HRT parameters,including the original heart rate（TO） and slope coefficient（TS）,systolic and diastolic blood pressures（SBP and DBP）,as well as blood cholesterol level（TC） were measured before and after treatment.Results：After treatment,TO and LVMI were lowered,while TS increased in both the VS group and the CM group（P〈0.01）,but changed insignificantly in the control group.Significant differences between the CM group and the control group were shown in terms of TO,LVMI,SBP,DBP and TS（P〈0.01）;and between the CM group and the VS group in terms of TO,LVMI and TS（P〈0.01）.Moreover,HRT parameters showed an evident correlation with LVMI（r=0.519-0.635,P〈0.01）. Conclusion：Combined therapy with XZK and Valsartan can improve hypertensive LVH and HRT parameters, and lessen the damage on the autonomous nervous system.展开更多
基金Project supported by the Key Industrial Projects of Science of Zhejiang Province (No. 2007C21079)the National Key Technologies R&D Program (No. 2007BAI07A28) of China
文摘Heart rate variability(HRV) analysis is affected by ectopic beats.An efficient method was proposed to deal with the ectopic beats.The method was based on trend correlation of the heart timing signal.Predictor of R-R interval(RRI) value at ectopic beat time was constructed by the weight calculation and the slope estimation of preceding normal RRI.The type of ectopic beat was detected and replaced by the predictor of RRI.The performance of the simulated signal after ectopic correction was tested by the standard value using power spectrum density(PSD) estimation,whereas the results of clinical data with ectopic beats were compared with the adjacent ectopic-free data.The result showed the frequency indexes after ectopy corrected had less error than other methods with the test of simulated signal and clinical data.It indicated our method could improve the PSD estimation in HRV analysis.The method had advantages of high accuracy and real time properties to recover the sinus node modulation.
文摘Objective：To observe the effect of combined therapy with Xuezhikang Capsule（血脂康胶囊,XZK） and Valsartan on left ventricular hypertrophy（LVH） and heart rate turbulence（HRT） in hypertensive patients. Methods：Ninety primary hypertensive patients with LVH were randomly assigned to three groups.Basic treatment,including aspirin,β-blockers,calcium antagonists,etc.were administered to all patients.Additionally, Valsartan（VS,80 mg once a day） was given to the 30 patients in the VS group.Valsartan（in the same dosage） and XZK（600 mg,twice a day） were given to the 32 patients in the Chinese medicine（CM） group,while none was given to the 28 patients in the control group.The therapeutic course lasted for 24 months.Changes in left ventricular mass index（LVMI） measured by cardiac ultrasonic indices,HRT parameters,including the original heart rate（TO） and slope coefficient（TS）,systolic and diastolic blood pressures（SBP and DBP）,as well as blood cholesterol level（TC） were measured before and after treatment.Results：After treatment,TO and LVMI were lowered,while TS increased in both the VS group and the CM group（P〈0.01）,but changed insignificantly in the control group.Significant differences between the CM group and the control group were shown in terms of TO,LVMI,SBP,DBP and TS（P〈0.01）;and between the CM group and the VS group in terms of TO,LVMI and TS（P〈0.01）.Moreover,HRT parameters showed an evident correlation with LVMI（r=0.519-0.635,P〈0.01）. Conclusion：Combined therapy with XZK and Valsartan can improve hypertensive LVH and HRT parameters, and lessen the damage on the autonomous nervous system.
