I previously worked as an NP in CTSICU which I am assuming is similar to the CVICU you will be interviewing in (since you mentioned working with CT surgeons). My first question would be what the NP/CNS role means. I worked in a purely NP role which meant that we managed patients from the surgeon and intensivist stand-point. We took care of fresh heart (CABG, valves, aortic repairs, VAD, heart transplants) and lungs (thoracotomies, pneumonectomies, and lung transplants) by being first call with any post-op issues such as hemodynamic instability and need for boluses or drips, bleeding issues and calling surgeons if take back was necessary, and extubations. For as long as the patient was in the ICU, we also took care of writing PO meds, pulling chest tubes and epicardial pacing wires, consulting PT and OT, and transferring patient out of the ICU. We wrote H&P's, daily progress notes, and procedure notes.
We did not function in the CNS role in the fact that we were not responsible for providing training to nurses who recover fresh hearts, we did not help with writing nursing related protocols, and we did not ensure that required nursing certifications are up to date with the all the staff nurses. There is a CNS in that role in that unit. We were part of a 24/7 covered service using a group of NP's in combination with General Surgery residents doing their ICU rotation working with an intensivist attending physician. We worked under the Surgical Critical Care service, not CTS, not nursing. It sounds like you will be working with the CT surgeons so I'd be interested in how that delineates with the intensivist role (if there is an intensivist in the unit). So in that sense, I would really find out what your role is and make sure that it is clearly understood by others who are also involved in the care of the patients in the ICU.