Defibrillator Video

I was watching a video clip of an episode of Rescue 911 on YouTube and paramedics have that

It conducts electricity. This helps prevent burning the patient receives the current. The gel is also used for diagnostic testing such as ultrasound, which enhances the visual reading of the examiner consults

It conducts electricity. The frost makes solid contact with the skin, and with the paddles. Without frost, electricity would arc, and you would have serious burns.

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The gel allows greater surface contact. The largest area is spreading and prevents the current location, which may cause localized burns. As more area is available, with better contact, the amount of current used can be more closely regulated.
Its all about control.