正常人标准胸导联和Mason-Likar胸导联心电图波段定量比较

目的：对我国正常人群标准12导联（标准导联）和Mason-Likar导联系统所记录胸导联心电图的波段进行定量比较。方法：选择84例冠状动脉造影和心脏超声检杏结果均正常者作为研究对象，其均接受标准导联加Mason-Likar导联心电网记录检查，观察2种导联系统胸导联心电图中以下测定值的相关性及差异，包括R波振幅、QRS波振幅、ST段值J点（ST on）、J点后0．08s（ST80 ms）和终点（ST end）]、ST段斜率及T波振幅。结果：标准导联与Mason-Likar导联系统所记录的胸导联心电图存在良好相关性，但也存在统计学差异（P〈0．001）与标准胸导联相比，Mason-Likar胸导联心电网差异包括部分导联QRS波振幅明显降低、ST段显著下移伴V1～V0导联T波振幅下降，V1导联中各波段降低均较显著（P均〈0．001）；Mason-Likar各胸导联中ST段的降低幅度均超过同一导联QRS波和T波的幅度改变,以V6导联变化最显著。平均体重指数（BMI）与V1、V3导联QRS波振幅的改变呈负相关：V1、V2导联ST80ms与T波振幅、QRS波振幅的改变呈正相关。结论：标准导联与Mason-Likar导联系统所记录心电图波段有一定差异。

Quantitative comparison between records of chest leads of standard lead system and Mason-Liker lead system in normal subjects

Objective To quantitatively compare the records of chest leads of ECG standard lead system and Mason-Likar modified lead system in normal subjects. Methods Eighty four subjects with normal coronary, angiography and eehocardiography were recruited and results of chest leads parameters of standard lead system and Mason-Liker lead system were quantitatively compared, including amplitude of R wave, amplitude of QRS complex, values of ST segment at J point （ST at J）, 0.08 second after J （ST 80 ms）. end point of ST （ST end）], slope of ST segment and amplitude of T wave. Results Close correlation was found between the reeords of chest leads of standard lead system and Mason-Liker lead system, however, there were also some signifieant differences （P〈0.001）. Compared with chest leads of standard lead system, the record of chest leads from Mason-Likar lead system had significant decrease in amplitude of QRS complex in part of the leads, significant ST segment depression associated with significant decrease in T wave amplitude in V1 to V6, the deerease of wave amplitude was more obvious in V1： amplitude of ST depression was greater than change of amplitude of QRS complex and T wave in the same lead, especially in V6. The change of amplitude of QRS complex in V1 and V3 correlated negatively with average body mass index （BMI）; changes of QRS eomplex amplitude and of T wave amplitude were positively ton＇elated with shifting of ST 80 ms in lead V1 and V2. Conclusions It is important to note there are stone differences between reeords of chest leads of standard lead svstem and Mason-Likar lead system.