Abstract
An exact separation of the right ventricular excitation from the left ventricular excitation is difficult with electrocardiography in the bundle branch block. On the other hand, the activity of the two ventricles can be separated, if one records the relative timing of the onset of the ventricular contraction, because this timing is related to the velocity of the impulse conduction to each ventricle ; thus this method of study offers important informations supplementary to what electrocardiograms reveal. The a, author found in 2 cases of transient right bundle branch block that this conduction abnormality caused Q-RVs to be prolonged. However, from animal experiments and further clinical observations it became clear that one can not always judge the presence or absence of a ventricular asynchronism only on the basis of the Q-RVs measurement, mainly because the normal value of Q-RVs varied over a broad range. On the other hand it was possible to demonstrate the presence of a ventricular asynchronism decisively in cases with the right bundle branch block by recording the relative timing of the onset of the right and left ventricular contraction.
