The only difference between a medically trained person and an average bystander is that the medical person will be more used to assessing the situation, taking a decision and then intervening with the patient.
You need no training to safely use an AED, though it will ask you to do chest compressions, and without training, the compressions are likely to be ineffective. Good compressions are surprisingly violent, and you'd never do that to someone unless you'd received training explaining why and how.
You need no training to safely use an AED, though it will ask you to do chest compressions, and without training, the compressions are likely to be ineffective. Good compressions are surprisingly violent, and you'd never do that to someone unless you'd received training explaining why and how.