Approximately 50% of left bundle branch blocks are associated with structural heart disease, while the other half are idiopathic or due to fibrosis of the cardiac conduction system which occurs ...

However, unlike in the presence of a left bundle branch block, myocardial ischemia and infarction can easily be detected on ECG when a RBBB is present (see anterior and inferior wall MI examples).

6,11 Heart rates ≥30 beats/min are considered normal in highly ... prolonged S wave upstroke and/or premature ventricular beats with a left bundle branch block (LBBB) morphology (figure 9). In some ...

VPDs with very short coupling intervals developing during an acute stage of myocardial infarction would predict the development of early cycled reentry, potentially culminating in VF, and requires ...