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Epinephrine
Epinephrine has two effects in our ACE settings. 1. Increases blood pressure 2. Increases chance of patient waking up
Timing-wise, it takes 10 seconds to become fully effective. It degrades linearly to having zero effect past 120 seconds.
More than 10 active Epinephrine will kill the patient.
Cardiac Arrest
A patient with no heart rate (and alive) is in a state of cardiac arrest.
The only way to get a patient out of this state is through CPR.
The only factor that affects the success rate of CPR is the patient's blood volume (epis have not effect here)
Unconsciousness
Once a patient's heart is restarted they enter a state of unconsciousness.
A patient becomes conscious by waking up. This is a random chance.
Epinephrine increases the chance of the patient waking up.
Now to answer your question.
Assuming a patient is unconscious, then you want to get them back in the fight ASAP.
After 30 seconds an epi is 75% effective After 60 seconds an epi is 50% effective After 90 seconds an epi is 25% effective
If the patient has multiple epis then their effects stack, but never above 100%.
Putting in an epi every 60 seconds will ensure that the total effect is always 75% or better
So depending on your medical resources, you can see that giving epis at least every 30-60 seconds is a good balance between waking them up and expending your limited resources.
UPDATED - with stacking epis
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