(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: The leads to look in first for left bundle branch block (LBBB) are leads V5, V6, and I. If the QRS is wide, mostly upright, and the T waves are inverted, then you are most likely looking at LBBB.