Simplify the following text for a Grade 15 native English-speaking person.
Original: Antiarrhythmic agents like amiodarone or lidocaine can help , but , unlike atrial fibrillation , ventricular fibrillation rarely reverses spontaneously in large adult mammals .
Simplified: Antiarrhythmic agents such as amiodarone or lidocaine can help , but , unlike atrial fibrillation , ventricular fibrillation rarely reverses spontaneously in large adult mammals .