Today's mini been is here! Overview of Ventricular Fibrillation Ventricular fibrillation is a heart rhythm problem that occurs when the heart beats with rapid, erratic electrical impulses. It is the most frequent cause of sudden cardiac death. The heart abruptly stops pumping blood to the body. The longer the body suffers from the reduced blood supply, the more is the risk of damage to the brain and other organs. Dr. Umara Ayub explains the normal heart conduction pathway starts at the SA node,