(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.
You may have been born with a bundle branch block, or it might occur when one of the bundle branches becomes diseased or damaged due to a heart attack, high blood pressure, or scar tissue that develops after heart surgery, or from a viral or bacterial infection of the heart muscle.