[Usefulness of time domain analysis of signal averaged electrocardiography in patients with sustained ventricular tachycardia and intraventricular conduction disturbance].
To determine the usefulness of time domain analysis of signal averaged electrocardiography (SAECG) in predicting the occurrence of sustained ventricular tachycardia (SVT) in patients with intraventricular conduction disturbance (IVCD), SAECG was recorded in 70 patients with IVCD; 24 of whom had a history of SVT. We divided patients into two groups; patients with rigth bundle branch block pattern (RBBB group, 36 patients) and left bundle branch block pattern (LBBB group, 34 patients). TQRSD, T40 and V40 were compared between patients with and those without SVT in the RBBB and LBBB group, respectively. All three parameters in the RBBB group and only V40 in the LBBB group showed a significant difference between patients with and those without SVT. In RBBB group TQRSD > or = 160 ms, T40 > or = 40 ms, V40 < or = 14 microV can distinguish patients with SVT from those without SVT with a sensitivity and specificity of 77% and 78%, 85% and 70%, 77% and 74%, respectively. In the LBBB group, only V40 < or = 14 microV can distinguish patients with SVT from those without SVT with 82% sensitivity and 87% specificity.
Katsuki
K
K
Aihara
N
N
D000368:Aged; D018780:Body Surface Potential Mapping; D005260:Female; D006327:Heart Block / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity; D017180:Tachycardia, Ventricular / Q000175:diagnosis*