That is a good question. Unfortunately my ground agency does not provide us with any of the studies or really the reasoning why they are changing things. In some cases we use 1mg of epi, in others we use 0.5mg. For example our V-Fib/V-Tach protocol only includes a single dose of 1mg of epi during the entire arrest. If we witness the patient go into V-Fib/V-Tach we do 3 stacked shocks.0.5 for cardiac arrests is an interesting one. Where did that come/what is the rationale?