Snapshot A 57-year-old woman presents to the emergency department after fainting. He was accompanied by his wife who witnessed the event. He was in his usual state of health until he developed palpitations that eventually resulted in him falling to the ground. He was unresponsive and the emergency medical services were called. Medical history is significant for a recent myocardial infarction. On physical exam he is unresponsive and no pulse is present. An electrocardiogram demonstrates a tachyarrhythmia with irregular QRS complexes of variable amplitude and morphology. (Ventricular fibrillation) Introduction A group of ventricular arrhythmias that include login to view 7 more bullets Epidemiology login to view 6 more bullets Symptoms login to view 6 more bullets Ventricular Arrhythmias Type Electrocardiogram Findings Treatment Ventricular premature beats (VPBs) Widened QRS complex with abnormal morphology Typically with reassurance or a β-blocker in healthy patients Ventricular tachycardia 3 or more consecutive VPBs, displaying abroad QRS complex tachyarrhythmia Stable amiodarone lidocaine procainamide Unstable synchronized cardioversion Pulseless ventricular tachycardia defibrillation Ventricular fibrillation Erratic rhythm with no discernable waves (P, QRS, or T waves) Defibrillation for all patients