标题: 新宽QRS鉴别方法挑战brugada四步诊断法 [打印本页] 作者: yuren 时间: 2007-4-13 16:52 标题: 新宽QRS鉴别方法挑战brugada四步诊断法 Application of a new algorithm in the differential diagnosis of wide QRS complex tachycardia
Aims The Brugada criteria proposed to distinguish between regular, monomorphic wide QRS complex tachycardias (WCT) caused by supraventr<!--HAODF:2:DE4r0u-lSI6Bfz46fy9waRQsfzPify4-->icu<!--HAODF:/2:DE4r0u-lSI6Bfz46fy9waRQsfzPify4-->lar (SVT) and ventricular tachycardia (VT) have been reported to have a better sensitivity and specificity than the traditional criteria. By incorporating two new criteria, a new, simplified algorithm was devised and compared with the Brugada criteria.
Methods and results A total of 453 WCTs (331 VTs, 105 SVTs, 17 pre-excited tachycardias) from 287 consecutive patients with a proven electrophysiological (EP) diagnosis were prospectively **ysed by two of the authors blinded to the EP diagnosis. The following criteria were **ysed: presence of AV dissociation; (ii) presence of an initial R wave in lead aVR; (iii) whether the morphology of the WCT correspond to bundle branch or fascicular block; (iv) estimation of initial (vi) and terminal (vt) ventricular activation velocity ratio (vi/vt) by measuring the voltage change on the ECG tracing during the initial 40 ms (vi) and the terminal 40 ms (vt) of the same bi- or multiphasic QRS complex. A vi/vt >1 was suggestive of SVT and a vi/vt 1 of VT. An initial R wave in lead aVR suggested VT. The overall test accuracy of the new algorithm was superior (P = 0.006) to that of the Brugada criteria. The new algorithm had a greater sensitivity (P < 0.001) and (–) predictive value (NPV) for VT diagnosis, and specificity (P = 0.0471) and (+) predictive value (PPV) for SVT diagnosis than those of the Brugada criteria [both NPV for VT diagnosis and PPV for SVT diagnosis were: 83.5% (95% confidence interval = CI 75.9–91.1%) for the new vs. 65.2% (95% CI 56.5–73.9%) for the Brugada algorithms].
Conclusion The new algorithm is a highly accurate tool for correctly diagnosing the cause of WCT ECGs.
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