Alctw10 Hey I'm not sure if you know this but in the game if a mission doesn't specify a % for critical care and the patient is a cat 1 it is default 100. So with the cardiac arrest it should always have a critical care chance in the game as it always has a c1 call grade (unless a c2 call grade was added).
My complaint with the Building Collapse and Firearms Attack is the chance is 100% so all 15ish patients ALL need critical care which can be difficult and annoying