OP - you need to also remember that even if our focus is on head injuries- patients are also critically ill with ards, PE, COPD, sepsis, and many others comorbidies conditions. that all adds up and you really care for MICU type patient where primary focus are neuro conditions.
on my unit, we also do PAR. pt who goes to OR from ICU is back straight to us after procedure is done. we also get lots of cardiac cath and interventional procedure patients - lots of cardiac monitoring. many of my coworkers did 12 leads courses, also CE for nurses, stroke certifications, NIHHS cert, trauma CE...
knowledge is huge and one need to thing about patient as whole person as anything can happen anytime.
our hospital policy is also to admit anyone with any type of condition when we have any open beds.