The current used in the paddles are selected to induce a current back into your heart, essentially giving it a kick start. It’s not the same as being electrocuted by lightning or electric chair because it’s bursts of electricity flowing through the heart to try and get it beating again!
You’re right in a way – the spots where the paddles are placed are usually wiped dry. If the patient is still in contact with water, they need to be removed completely otherwise you can electrocute them and anyone else in the water!
The point here is when the patient is given defibrillation ( shock to the chest using pads) it is ensured that there is no electric circuit formed through the body of the patient. If this happens as Jim mentioned above the electricity will flow through the patient’s and may burn them. Also the self adhesive patch defibrillators are available now which are safer than older versions of the pads….
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