par Segers, Marcel 
Référence The American heart journal, 37, 1, page (92-99)
Publication Publié, 1949-01
Référence The American heart journal, 37, 1, page (92-99)
Publication Publié, 1949-01
Article révisé par les pairs
| Résumé : | 1. 1. The magnitude and location of delays in appearance of the intrinsic deflection in multiple precordial leads have been used to differentiate various types of intraventricular block. 2. 2. In complete bundle branch block the intrinsic deflection of the involved ventricle arrives 0.05 second or more later than in the case of normal invasion. This delay occurs in all the leads from one side of the precordium. In incomplete bundle branch block the same facts are observed, but the delay is less than 0.05 second. 3. 3. In other types of intraventricular block the delay of the intrinsic deflection occurs only over a small area of the precordium, and the conclusion is drawn that the activation of only a part of the ventricle is delayed. Such types of intraventricular block may be called focal block. They are of major degree when the duration of QRS in the limb leads is 0.12 second or more and of minor degree if QRS is of lesser duration. 4. 4. In general, intraventricular block of the S type corresponds to focal right block, whereas the uncommon type corresponds to right bundle branch block. 5. 5. In general, the common type of intraventricular block corresponds to left bundle branch block when the summit of R1 shows a plateau and corresponds to focal left block when the summit of R1 is peaked, with a broad notch on the descending limb of the R wave. © 1949. |
