The LBBB in general population ranges from 0.1-0.8%, and the Right Branch Bundle Block (RBBB) is around 1.9-24.3 per thousand, and in the general population over 52 years old with any complete BBB had 3.7% of prevalence.

In the general population, BBB is not as common as in the population with HF. Its usual to see these abnormal ventricular conduction with HF, since BBB and HF most of the time share the same ethyology about one third of the patients with this comorbidity have a BBB identified with by your QRS complex criteria, and most of the cases there is a left bundle branch block (LBBB) associated.

The bundle branch block (BBB) is an alteration of the ventricular conduction that may lead into a ventricular dyssynchrony and to heart failure (HF). Even the asymptomatic ones with coronary risk factors, should be carefully followed, once they have been associated with an increased mortality if compared with those who are not affected by bundle branch blocks. Physicians should keep their patients with heart failure, myocardial infarction, and other abnormalities associated with BBB, under watch. Therefore, in this review, we intend to make an approach of the BBB and its prognosis relevance based on the latest studies about this role. Both have shown its relation with patient’s mortality and prognosis implications. LBBB and RBBB prognosis strength are taking new positions over the time. RBBB is usually associated to benign findings in healthy and asymptomatic individuals nevertheless it can indicate affection of the right side of the heart through cor pulmonale, myocardial ischemia/infarction, pulmonary embolism, myocarditis, or congenital heart disease. Left BBB (LBBB) has been associated with cardiovascular disease complications in a much larger number of cases if compared to Right BBB (RBBB). An increasing number of papers, most based on epidemiology, have shown a strong association between bundle branch block (BBB) and cardiovascular disease, more specifically hypertension, cardiomegaly, coronary artery disease, and heart failure.

Which is right and left