How strong is the shock from an implantable defibrillator?

The shock from an implantable defibrillator can range from 20 to 50 joules, which is significantly stronger than a typical household electrical shock. This high-energy shock is designed to reset the heart's rhythm and can cause a brief but intense sensation, often described as a strong kick or jolt. While it can be uncomfortable, the primary goal is to restore normal heart function in life-threatening situations. Most patients report that the experience is less painful than they anticipated.