Is there a cure for a left bundle branch block?

Bundle branch block: A left bundle branch or LBBB is a slowing of conduction in the left bundle of the conduction system to the left ventricle. It may be a sign of underlying problems ie coronary artery disease or electrolyte abn. Or may be from congenital heart dz. There are many causes and your ans. Would depend on the cause . Sometimes its just a matter of close observation and treating risk factors.

Cure?: "cure" suggests that LBBB is a disease but it is not. It is associated with underlying structural heart disease and that is what should be addressed. Lbbb causes no symptoms and it requires no treatment.