近期算法对自动QT测量可靠性的改进与局限
Improvement and limitation of the reliability of automated QT measurement by recent algorithms.
作者信息
Tyl Benoît, Azzam Sara, Blanco Nathalie, Wheeler William
机构信息
Department of Cardiology, Robert Ballanger's Hospital, Aulnay Sous Bois, France.
出版信息
J Electrocardiol. 2011 May-Jun;44(3):320-5. doi: 10.1016/j.jelectrocard.2010.11.006. Epub 2010 Dec 15.
BACKGROUND
Newer algorithms for automated QT interval measurements may be more reliable than previous algorithms.
OBJECTIVE
This study compares Bazett-corrected QTc obtained by an older algorithm (Old12SL) and by 2 newer ones (New12SL and v3.19) to semiautomated measurement performed by experienced cardiologists.
METHODS
A total of 6105 randomly selected electrocardiograms were classified by the cardiologists as normal (4227), borderline (1254), abnormal (575), or not analyzable (49). Errors of automated measurement were defined by more than 30 milliseconds of absolute difference between Bazett-corrected QTc obtained by automated algorithms and semiautomated measurement.
RESULTS
The Old12SL had approximately twice as many errors (5.25%) as the New12SL (2.33%) and v3.19 (2.30%), P < .0001. Abnormal tracings resulted in more errors than did normal ones (Old12SL: 16.52% vs 3.45%, New12SL: 7.30% vs 1.51%, and v3.19: 10.61% vs 1.21%).
CONCLUSION
Newer automated algorithms for QT measurements are highly reliable in normal tracings. However, electrocardiogram abnormalities increase the risk of QT measurement errors.
背景
用于自动测量QT间期的新算法可能比以前的算法更可靠。
目的
本研究将一种较旧算法（Old12SL）以及两种较新算法（New12SL和v3.19）所获得的经巴泽特校正的QTc与经验丰富的心脏病专家进行的半自动测量结果进行比较。
方法
心脏病专家将总共6105份随机选择的心电图分类为正常（4227份）、临界（1254份）、异常（575份）或无法分析（49份）。自动测量的误差定义为自动算法获得的经巴泽特校正的QTc与半自动测量结果之间的绝对差值超过30毫秒。
结果
Old12SL的误差（5.25%）约为New12SL（2.33%）和v3.19（2.30%）的两倍，P <.0001。异常心电图的误差比正常心电图更多（Old12SL：16.52%对3.45%，New12SL：7.30%对1.51%，v3.19：10.61%对1.21%）。
结论
用于QT测量的更新的自动算法在正常心电图中高度可靠。然而，心电图异常会增加QT测量误差的风险。
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