Can I harm anyone by using the defibrillator?
Quite clearly, no. A defibrillator only delivers a shock to a person with ventricular fibrillation and pulseless ventricular tachycardia.
Operating a defibrillator (AED) is child's play. Switch on the device and you will be guided step by step through the event by clear voice instructions. After the electrodes have been attached, the device automatically checks the heart rhythm and decides whether an electric shock is necessary. A simple press of the shock button is enough to get the flickering heart beating rhythmically again. The electric shock can be compared to a conductor's baton, which leads the orchestra into a harmonious rhythm with a powerful knock. These particularly good survival rates can only be achieved if the current is delivered within the first 3-5 minutes after collapse.
This is why it is important not to wait until the emergency services arrive before using them. So it takes dedicated first responders - such as relatives, work colleagues, neighbours and fellow citizens in public spaces - but also defibrillators placed at sensible intervals to save lives.