Advanced Cardiac Life Support protocols. Casualty is intubated or having O2 supplied through bag and mask... Normal practice when defibbing an adult will have the operator supply a 200-joule shock, then adrenalin would go in. If that fails, then they try a 300 joule shock. After that, it's 360, epi, 360, epi...

These are when they are shocking an adult externally. With a child (remembering from Casualty, I believe it's half that). *internally*, as in directly across the heart, it'll be down around the 20-50 joule mark.

Most automatic ones, though, have two settings - 200 and 360. In this case, it's 200, 200, 360...