【摘要】 目的以超声心动图(UCG)为标准,衡量阻抗心动图(ICG)监测心脏收缩功能的准确性。方法健康青年30名为对照组,30名自主神经功能紊乱综合征患者(PSDS)为患者组,同时用UCG与ICG测量左心收缩功能SV、SI、CO、CI、EF及ET、PEP、HR,比较两种方法的测值,利用回归方程校正ICG测值。结果两种方法对对照组的测值无显著性差异(P>0.05)。患者组的SV变异系数大,达0.22,方差149.43,两种方法对基于SV的参数SV、SI、EF测值有差异显著性(P<0.05),ICG的测值比UCG大,可用回归方程加以校正(P<0.05),回归系数分别为0.92、0.93、0.96;基于时间的参数PEP、ET、HR无差异显著性(P>0.05);CO、CI是SV与心率的乘积,亦无差异显著性(P>0.05)。结论 ICG测量心脏收缩功能,对于变异小的指标,测值与UCG高度相关,两种方法无差异显著性。对于变异大的SV及EF,所测结果与UCG有差异显著性,ICG的测值比UCG稍大,可通过回归方程给予校正。ICG进行心功能连续监测任务具有可行性。更多还原

【Abstract】 Objective To evaluate accuracy of Impedance cardiography(ICG)in measuring cardiac systolic function by a gold standard with Ultrasonocardiography(UCG).Methods 30 healthy young volunteers were assigned to control group,18 males and 12 females,aged 27.9(23~34).30 patients with Parasympathetic Dysfunction Syndrome(PSDS)and without organic cardiopathy were assigned to patient group,11 males and 19 females,aged 54.8(42~68).After 20 minutes’repose on bed,left cardiac systolic functions’stroke volumn(SV),stroke index(SI),cardiac output(CO),cardiac index(CI),ejecting fraction(EF),ejecting time(ET)and Preejection period(PEP)of all these objects were simultaneously measured by UCG and ICG for 4 times,2 minutes’interval each time.Subsequently,the same procedure of another 4 times were performed after 20 minutes’standing.Data of UCG and ICG were analyzed and compared.Results There was no significant difference in control group’s measurement between UCG and ICG(P>0.05).In patient group,variance coefficient(CV)of SV was large,reaching 0.22,and sequare diversity(SD)reaching 149.43.SV had a significant difference between UCG and ICG(P<0.05),as well as SI and EF.Measurement of ICG value was larger than that of UCG,and regression equation correction was available(P<0.05),regression coefficience was 0.92,0.93,0.96.Time-based parameters of PEP,ET,HR,CO AND CI had no significant difference(P>0.05).Conclusions For parameters of small variation,ICG measuring left cardiac systolic function is highly correlated with UCG,without significant difference.Whereas for parameters of large variation,had a significant difference,ICG’s value is slightly larger than that of UCG,correction can be achieved by regression equations.ICG is feasible for continuous monitoring of left cardiac function.更多还原