Abben R, Denes P, Rosen K M
Chest. 1979 May;75(5):575-8. doi: 10.1378/chest.75.5.575.
In an attempt to elucidate the specificity and sensitivity of atypical findings during left bundle branch block (LBBB) with respect to myocardial infarction (MI), we analyzed ECGs from patients with intermittent LBBB obtained by mail solicitation of cardiologists. The group consisted of 256 patient files fulfilling the following criteria: 1) complete LBBB present on one or more 12-lead ECGs, and 2) at leat one 12-lead ECG taken subsequent to a LBBB tracing exhibiting absence of LBBB (non-LBBB). The sensitivity of atypical LBBB for predicting presence of MI was 0.41, the specificity 0.64, and the accuracy 0.59. No specific atypical finding was significantly better than any other in predicting MI. We conclude that atypical findings present during LBBB are of little value in predicting the presence of MI (as diagnosed by significant Q waves present during non-LBBB conduction).
为了阐明左束支传导阻滞（LBBB）期间非典型表现相对于心肌梗死（MI）的特异性和敏感性，我们通过向心脏病专家邮寄征集，分析了间歇性LBBB患者的心电图。该组包括256份符合以下标准的患者档案：1）一份或多份12导联心电图上出现完全性LBBB，以及2）在LBBB心电图记录之后至少有一份12导联心电图显示无LBBB（非LBBB）。非典型LBBB预测MI存在的敏感性为0.41，特异性为0.64，准确性为0.59。在预测MI方面，没有任何特定的非典型表现明显优于其他表现。我们得出结论，LBBB期间出现的非典型表现对预测MI的存在价值不大（如通过非LBBB传导期间出现的明显Q波诊断）。
