Ventricular Fibrillation - EKG Reference This reference guide requires a paid plan Unlock quizzes, lessons and more. Sign Up Key Features Ventricular Fibrillation EKG Reference Definition of Ventricular Fibrillation Ventricular fibrillation is an emergency that requires immediate medical attention. It is a frequent cause of sudden cardiac death. When it occurs, the coordinated contraction of the ventricles is replaced rapid, chaotic electrical signals. As a result, the heart cannot pump blood. Quick Links Sinus Atrial Junctional Ventricular Atrioventricular Pacemaker All