What does a left bundle branch block on an EKG suggest?

A left bundle branch block (LBBB) on an EKG indicates a delay or blockage in the electrical conduction system of the heart, specifically in the left bundle branch. This alteration in conduction can suggest the presence of underlying heart disease. Patients with LBBB may have a range of conditions including coronary artery disease, hypertension, cardiomyopathy, or valvular heart disease. The presence of LBBB often indicates that the heart is attempting to compensate for structural or functional abnormalities, which can lead to more severe cardiovascular issues over time. Therefore, identifying an LBBB is crucial, as it can serve as a marker for significant cardiac pathology that requires further evaluation or management.