[Vectorcardiography in the diagnosis of the association of inferior necrosis--left intraventricular conduction disorders].

The authors study 53 vectorcardiograms (VCG) which demonstrate the association of inferior myocardial necrosis with left intraventricular conduction disturbances (LIVCD) consisting of 44 left anterior hemi-blocks (LAHB), 2 left posterior hemi-blocks (LPHB) and 7 complete left branch blocks (CLBB). In the presence of LAHB, the ECG and VCG diagnosis concur in 37 cases, with a more obvious appearance on the VCG in 16 cases. In 7 cases, only the VCG provided the diagnosis of this association. In the presence of LPHB, the ECG, in one case, only showed signs of necrosis and only the VCG revealed the hemi-block; in the other case, the ECG showed signs of LPHB, but the Q waves did not present the criteria of necrosis. Once again, only the VCG provided the diagnosis of the association. Finally, in the presence of CLBB, the diagnosis were in agreement in only 3 cases. In two cases, only the VCG revealed the necrosis, in one case, the ECG was superior and in the remaining case, the ECG and the VCG were equally ineffective in confirming the inferior necrosis which was nevertheless definitely present. On the basis of these findings, the authors discuss the ECG criteria of the association of inferior necrosis and LIVCD.