Ventricular Fibrillation - EKG Reference Caliper Time Interval: ___ seconds Key Features RhythmHighly irregular RateUnmeasurable P WaveAbsent PR IntervalNot measurable QRSNone NotesEKG tracings is a wavy line 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