Accurate electrocardiographic assessment of the QT interval: Teach the tangent
Accurate electrocardiographic assessment of the QT interval: Teach the tangent
复制标题
DOI：
10.1016/j.hrthm.2008.03.037
复制
发表时间：
2008-07-01
期刊：
影响因子：
5.5
通讯作者：
Wide, Arthur A. M.
中科院分区：
文献类型：
--
作者：
Postema, Pieter G.;De Jong, Jonas S. S. G.;Wide, Arthur A. M.
BACKGROUND Long QT-Syndrome (LQTS) is a prevalent and possibly lethal disease. Unfortunately, it has recently been shown that the majority of physicians, including many cardiologists, do not recognize a long QT interval when they see one. Conversely, almost 40% of patients referred to specialized centers with a presumed diagnosis of LQTS have a normal QT.OBJECTIVE The purpose of this study was to investigate whether we are able to teach inexperienced electrocardiogram (ECG) readers a method that will result in a higher accuracy of QT measurements.METHODS Four previously published ECGs (two LQTS, two normal) were assessed by 151 medical students using the following QT measurement method: (1) the end of the T wave is the intersection of a tangent to the steepest slope of the last limb of the T wave and the baseline, in Lead II or V5; (2) QTc = QT/root RR; (3) QTc>450 ms is prolonged. Four months later, 71 students measured the ECGs again. Student results were compared with previously published results on the same ECGs of 25 LQTS experts, 106 arrhythmia experts, and 771 cardiologists and noncardiologists.RESULTS Correct QT interval interpretations were achieved by 71% and 77% of students during the first and second test, respectively, as compared with 62% by the arrhythmia experts and
