A simple procedure for estimation of the spatial QRS/T angle from the standard 12-lead electrocardiogram
A simple procedure for estimation of the spatial QRS/T angle from the standard 12-lead electrocardiogram
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DOI：
10.1016/j.jelectrocard.2006.11.003
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发表时间：
2007-05-01
影响因子：
1.3
通讯作者：
Zhang, Zhu-Ming
中科院分区：
文献类型：
--
作者：
Rautaharju, Pentti M.;Prineas, Ronald J.;Zhang, Zhu-Ming
y空间QRS/T角已被确定为不良心脏事件的强预测因子。通过矩阵变换方法生成的X、Y和Z导联的平均QRS和T振幅通常用于计算QRS/T角（QRS/T矩阵）。许多调查人员发现这一程序很麻烦。我们使用来自Atheroscleroin Communities研究的14881名年龄在45至65岁之间的男性和女性的心电图数据文件，推导出估计空间QRS/T角（QRS/T-simple）的简单公式。QRS/T-simple计算为平均QRS和T向量之间的反余弦，每个向量近似为3个QRS（净）和T-net振幅。QRS/T-simple对QRS/T-matrix变异的解释率为79%（r = 0.89）。使用性别特异性阈值，QRS/T-simple检测到异常宽QRS/T矩阵值，灵敏度为91%，特异性为88%。结果表明，这种简单的方法可以代替矩阵变换法中的QRS/T。(C)2007年爱思唯尔公司All rights reserved.
yThe spatial QRS/T angle has been identified as a strong predictor of adverse cardiac events. Mean QRS and T amplitudes from X, Y, and Z leads generated by a matrix transformation method are often used to calculate the QRS/T angle (QRS/T-matrix). Many investigators find this procedure cumbersome. We used electrocardiographic data files of 14881 men and women aged 45 to 65 years from the Atherosclerosis in Communities study to derive a simple formula for estimated spatial QRS/T angle (QRS/T-simple). QRS/T-simple is calculated as the inverse cosine between the mean QRS and T vectors, which are approximated by 3 QRS(net) and T-net amplitudes for each vector. QRS/T-simple explained 79% of the variance of QRS/T-matrix (r = 0.89). Using sex-specific thresholds, QRS/T-simple detected abnormally wide QRS/T-matrix values with a sensitivity of 91% and specificity of 88%. It is concluded that this simple method may provide a satisfactory substitute for QRS/T from the matrix transformation method. (C) 2007 Elsevier Inc. All rights reserved.