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[Ventricular conduction disorder in presence of dead myocardium].

In the presence of an advanced degree left bundle branch block (LBBB) with an extensive "Jumping wave" phenomenon, the septal activation abnormally spreading originates septal electromotive forces of greater duration and consequently more important than normal ones. The coexistence of an inactive anteroseptal myocardium with an advanced degree block causes the phenomenon of "Jumping wave" begins in postero-septal regions. Therefore the external left electrodes see the first ventricular activation fronts moving away and register Q waves. The presence of transmural inactive myocardium in the free left ventricular wall permits the corresponding external electrodes to record the morphology of the ipsilateral intraventricular complex: S. An intermediate degree LBBB produces a limited right to left "Jumping wave" phenomenon. When it is associated to septal inactive myocardium, the electrical manifestations of left block are reduced, but those of myocardial necrosis persist: loss of the manifestation of first right septal vector and presence of Q waves in left leads. Because of an advanced degree right bundle branch block (RBBB) with an extensive "Jumping wave" phenomenon, electromotive septal forces of greater duration and consequently more important than normal ones, are originated also. The coexistence of inactive antero-septal myocardium with an advanced degree RBBB causes the phenomenon of "Jumping wave" begins in inferior postero-septal regions. Therefore, the transitional leads see the first fronts of the said phenomenon moving away and register Q waves. The presence of inactive transmural right parietal myocardium permits the corresponding external electrodes to record the morphology of the ipsilateral polyphasic intraventricular complex. An intermediate degree RBBB, associated to antero-septal necrosis, is characterized by the reduction of the electrocardiographic signs of the said block and the presence of Q waves in the right precordial and transitional leads.