I loved doing CRRT while I was in the unit. Some ICU nurses love the ICU because of the adrenaline. I loved it for the multiple organ system failure, the very sickest of the sick. When we're still doin everything possible, and one system after another fails, dialysis becomes inevitable as do pressors. My unit's resource nurses knew I loved the 1:1 CRRT patients, so I got them often.
There is probably not very much adrenaline in CRRT, it just goes along and needs tweaking every now and then to keep running, but it is still technically challenging if you take the time to understand it and don't just let the machine run for the sake of running. There is a ton of information being collected and just waiting to be utilized in the best way possible.