(The SANS Institute, Bethesda, MD, www.sans.org) A membership organization devoted to computer security founded in 1989.
A bundle branch block is a defect of the bundle branches or fascicles in the electrical conduction system of the heart. bundle branch block is a defect of the bundle branches or fascicles in the electrical conduction system of the heart.
Left bundle branch block is a significant finding for two different reasons. First, left bundle branch block most often occurs as a result of some underlying heart problem. So when it is found, it is quite likely that some significant underlying cardiac condition is also present.