Hyperbaric nursing requires nurses to be certified as a Certified Hyperbaric Registered Nurse, as well as know how to handle any adverse reactions, and there must always be a physician on watch in case of emergency.
The National Board of Diving and Hyperbaric Medical Technology offers certification in hyperbaric nursing as a Certified Hyperbaric Registered Nurse (CHRN). Hyperbaric nurses either join the patient inside the multiplace hyperbaric oxygen chamber or operate the machine from outside of the monoplace hyperbaric oxygen chamber, monitoring for adverse reactions to the treatment. These nurses must work under a supervising physician trained in hyperbarics who is available during the treatment in case of emergency. 
