(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.
Causes of Bundle Branch Block. Bundle branch block has many causes, including a heart attack, heart infection (myocarditis), heart disease, high blood pressure, scarring of the heart tissue, congestive heart failure, and pulmonary embolism. Bundle Branch Block: Related Medical Conditions.