多普勒超声与同步心电图测定正常人左室收缩期时相的方法学研究

探讨以多普勒超声结合同步心电图定义左室收缩期时相的可行性。采用多普勒超声与同步心电图同时显示主动脉瓣口血流频谱及心电图的波形 ,测定 13例正常人左室收缩期各时相的时间与二维容积参数 ,比较常规法与多普勒超声法的测值之间差异 ;分析两种方法测值之间相关性和一致性。结果 :两种方法测量的左室收缩末期的时间无统计学差异 (P>0 .0 5 ) ,两者具有高度线性相关关系 (r=0 .91,P<0 .0 1)。 Bland- Altm an分析两种方法测值一致性良好 ;两种方法测量的左室收缩末期的容积无统计学差异 (P>0 .0 5 ) ,两者具有高度线性相关关系 (r=0 .97,P<0 .0 1)。两种方法测量的容积一致性良好 ;多普勒法测量的左室等容收缩末期的容积和常规法测量的左室舒张末期的容积经比较无统计学差异 (p>0 .0 5 ) ,两者具有高度线性相关关系 (r=0 .98,P<0 .0 1)。多普勒法测量左室等容收缩末期容积与常规法测量左室舒张末期容积一致性良好。多普勒超声结合同步心电图确定左室收缩期时相的方法是可行的 ,并与常规法具有相互替代性。

Method for Measuring Different Phases of Left Ventricular Systole Period with Ultrasonic Doppler and Synchronism Electrocardiogram in Normal Persons

This study of methodology was aimed to assess the feasibility of measuring different phase of left ventricular systole period with ultrasonic Doppler and synchronism electrocardiogram. We measured the phases of left ventricular systole period and left ventricular volumes in 13 normal persons,using spectrum of aortic valve orifice flow and synchronism electrocardiogram. The values measured by routine method and by Doppler method were compared. The correlation and agreement between the measures ascertained by the two ways were analyzed. The time parameters of end systole of left ventricule showed no significant difference between the two ways (P>0.05);there was high linear correlation between the two parameters (r=0.91,P<0.01);there were good agreements between the two parameters of the two ways by Bland-Altman analysis. The volume parameters of left ventricular systole end showed no significant difference between the two ways (P>0.05);there was high linear correlation between the two parameters (r=0.97,P<0.01);there were good agreements between the two volume parameters of the two ways. The volume in the left ventricular systole end determined by Doppler method and the volume in the left ventricular diastole end determined by the routine method showed no significant difference (P>0.05);there was high linear correlation between the two parameters (r=0.98,P<0.01);there was good agreement between the two volume parameters of the two ways. It is feasible to measure different phases of left ventricular systole period with the combined use of ultrasonic Doppler and synchronism electrocardiogram,and this combinaterial method and the routine method can be replaced with each other according to the clinical setting.