Can a jump scare set off a pacemaker or implantable defibrillator?

There is a very small risk that a jump scare could set off a pacemaker or implantable defibrillator, but it's unlikely. Jump scares are generally associated with a sudden increase in heart rate, and people with pacemakers or implantable defibrillators are usually advised to avoid situations that might cause their heart rate to spike. However, the risk of jump scares setting off these devices is very small, and most people don't need to worry about it.