Final answer:
Ventricular Fibrillation (VF) and Ventricular Tachycardia (VT) are two shockable heart arrhythmias that can be treated with defibrillation, allowing the heart to potentially return to a normal rhythm after receiving an electrical shock.
Step-by-step explanation:
There are two types of heart arrhythmias that are considered shockable rhythms and can be treated with defibrillation. These are Ventricular Fibrillation (VF) and Ventricular Tachycardia (VT). Ventricular Fibrillation is a condition where the heart quivers instead of contracting properly to pump blood, which can be life-threatening as it can lead to cardiac arrest. Ventricular Tachycardia, on the other hand, is a fast but regular beating of the ventricles that can also be dangerous and may deteriorate into Ventricular Fibrillation if not treated promptly. Treatment with a defibrillator involves delivering an electrical shock to the heart, which aims to interrupt the abnormal rhythm and allow the heart to reestablish a normal rhythm. During this process, both the heart and breathing may stop briefly, but surprisingly they often return to normal following the shock, much like erasing and restarting an electronic device.