Ventricular fibrillation (VF)  is characterized by rapid, chaotic, and asynchronous contraction of the left ventricle (LV). The surface electrogram of VF reveals a rapid, irregular, dysmorphic pattern with no clearly defined QRS complex. VF is associated with rapid hemodynamic collapse and is the most common arrhythmia resulting in out-of-hospital cardiac arrest. Furthermore, patients who suffer a cardiac arrest have significant risk of subsequent arrest.

Note: The QRS complex is a name for the combination of three of the graphical deflections seen on a typical electrocardiogram (EKG or ECG).

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