Is ventricular fibrillation the cause of cardiac arrest?

2 causes: Broadly speaking, there are 2 causes of cardiac arrest: ventricular fibrillation and asystole.

One of them: It is the most common heart arrhythmia associated with cardiac arrest. It is not exact to call it the cause, since ventricular fibrillation itself has an underlying cause, most commonly coronary artery disease, but there are others.

Sometimes...: Ventricular fibrillation is a cardiac arrhythmia that results in the heart being unable to circulate blood. Thus, there is no pulse with this rhythmn. However, there are other cardiac rhythmns that also result in cardiac arrest.