I second what Natbug said. Go to a unit that utilizes lots of vasoactive drips and has invasive hemodynamic monitoring (CVP, PA caths, etc.). That is what I was encouraged to do. They teach you most of what you need in CRNA school but you will be a lot more comfortable having worked with these things in your ICU. I come from a CV Recovery Room where we recover open hearts, transplants, valve repairs, etc. and any other type of cardio-thoracic surgery you can think of. We also take balloon pumps, CRRT, etc. Needless to say, I felt very confident and prepared during my interview. To many schools, it doesn't really matter what ICU setting you come from. They take pediatric, med. surg. ICU, etc. I was told by one Anesthesia program director that ICU is ICU. Just get the experience, so go where you feel the most comfortable and good luck.