Final answer:
Ventricular fibrillation (VF) is a life-threatening cardiac rhythm disorder that can occur in patients with pre-existing heart conditions. VF can also occur in patients who have experienced electric shock, drug overdose, drowning, or severe electrolyte imbalances.
Step-by-step explanation:
Ventricular fibrillation (VF) is a life-threatening cardiac rhythm disorder in which the ventricles of the heart quiver instead of pumping blood effectively. Patients who are at a GREAT risk for VF are those with pre-existing heart conditions, such as coronary artery disease or a history of heart attack. Other patients in whom VF might occur include those who have experienced electric shock, drug overdose, drowning, or severe electrolyte imbalances.