For the purposes of this chapter, certified registered nurse anesthetist means any licensed registered nurse licensed under Section 34-21-20, who is a graduate of a formal education program accredited by the Council on Accreditation of Nurse Anesthesia Educational Programs or its predecessor and who is currently certified as a registered nurse anesthetist by the National Board of Certification and Recertification for Nurse Anesthetists, or other certifying body approved by the Board of Nursing.