(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.
There are also partial blocks of the left bundle branch: left anterior fascicular block (LAFB) and a left posterior fascicular block (LPFB). This refers to the bifurcation of the left bundle branch.