Solutions
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wtbcrna's post in CRNAs in Critical Care Medicine was marked as the answerIn general CRNAs don't work that way since NA school does not usually cover long term care of critically/acutely ill patients. MDAs spend a significant portion of their training in ICU.
There is also will be the complication with credentialing and prescriptive authority depending on the state you want to practice in. Most CRNAs that work in critical care/ER etc and in anesthesia are dual certified as an NP and CRNA.