As a medical professional with expertise in emergency medicine, I can provide you with an accurate response to your question. A defibrillator is a device that is used to provide a high-energy electric shock to the heart. This is done to abruptly interrupt any chaotic electrical activity that may be causing a life-threatening abnormal heart rhythm, such as ventricular fibrillation or ventricular tachycardia. The defibrillator does not "restart" the heart in the literal sense, but rather it allows the heart's natural pacemaker to reestablish control and restore a normal heart rhythm. It's important to note that a defibrillator should only be used when there is a confirmed need, typically when someone is experiencing sudden cardiac arrest and a shockable rhythm is detected. The device will analyze the heart rhythm and will only deliver a shock if it determines that doing so is appropriate. Using a defibrillator is a critical skill for healthcare providers and has become increasingly important as more public places are equipped with automated external defibrillators (AEDs), which can be used by laypersons with minimal training. read more >>

The only effective treatment is to deliver an electrical shock using a device called a defibrillator (to de-fibrillate the heart), which stops the chaotic rhythm of a heart in VF, giving it the chance to restart beating with a normal rhythm.read more >>