Hyperbaric nursing requires nurses to have certification, 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). These nurses must work under a supervising physician trained in hyperbarics who is available during the treatment in case of emergency. The nurse must know how to handle each adverse event appropriately. 
