advanced practice registered nurse role certified registered nurse anesthetist role A nurse with advanced education and training in anesthesiology who has successfully completed a national certification examination process, and is credentialed to practice by a healthcare facility. An advanced practice registered nurse role that is the specified outcome of an accredition process with the Council of Accreditation in the United States of American and depends on graduate level education and board certification in anesthesiology. CRNA role Mathias Brochhausen