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In page Certified registered nurse anesthetist:

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Under US law, Frank v. South,[1] Chalmers-Francis v. Nelson[2] and other court decisions established that anesthesia was the practice of nursing as well as medicine.[3] As such, the practice of anesthesia in the US may be delivered by either a nurse anesthetist or an anesthesiologist. The decisions have not been challenged since the Dagmar Nelson case.[4] In addition to legal decisions, individual hospital and surgical facility policies also regulate the granting of anesthesia clinical privileges and are often based on contractual agreements with provider groups.[citation needed]