In recent years, the population of patients implanted with a left ventricular assist device has been increasing. Ventricular arrhythmias are the most interesting and most deadly complications among patients with these implants. Ventricular arrhythmias may cause cardiovascular collapse and death in some cases, whereas they may be asymptomatic or less symptomatic in others. In the case described here, we present the therapeutic approach to a patient with a left ventricular assist device who had ventricular fibrillation and the pathophysiology of his clinical condition.