Definition<unk>  is defined as ventricular fibrillation not preceded by heart failure or shock, in contrast to secondary ventricular fibrillation, which is.
Primary ventricular fibrillation
Re-entry ventricular arrhythmia
Pre-excitation syndrome
AV nodal reentrant tachycardia
Sudden arrhythmic death syndrome
Unstable angina
Ventricular flutter
Familial atrial fibrillation