I would like to ask you regarding one of our patient’s device (Ahmed glaucoma valve implant/ glaucoma drainage implant). Is he allowed to enter the hyperbaric chamber with this device without any concern?
Posted Date: 2/5/2020
MEDFAQ Question: I would like to ask you regarding one of our patient’s device (Ahmed glaucoma valve implant/ glaucoma drainage implant). Is he allowed to enter the hyperbaric chamber with this device without any concern?
Thank you for your question. The UHMS HBO2 safety committee can provide information to assist you in answering your question, but the ultimate responsibility for these types of questions rests with the medical director and safety director of your facility.
The safety committee understands this item to be surgically attached to the sclera of the eye and free of air. Therefore it is reasonable to consider that pressure would have no effect on the functionality of the device. However, we strongly suggest that a risk assessment be performed by the hyperbaric physician aided by the patient’s ophthalmologist, as there may be the potential for intraocular changes during and after hyperbaric oxygen therapy.
Literature review reveals a handful of studies and commentary on the application of hyperbaric oxygen therapy, intraocular pressure, and glaucoma-related procedures, but there are no known studies specifically related to the Ahmed valve and hyperbaric oxygen therapy.
The following references may assist you in completing the risk assessment and determining the proper course of action for your particular case. Again, we strongly suggest consulting the patient’s ophthalmologist prior to the decision to proceed with hyperbaric oxygen therapy:
Ersanli D, Akin T, “The effect of hyperbaric oxygen on intraocular pressure,” Vol 33: Journal of the Undersea and Hyperbaric Medical Society, 2006
McMonnies CW, “Hyperbaric oxygen therapy and the possibility of ocular complications or contraindications” Journal of clinical and experimental optometry, 2015, Volume 98, Issue 2, Pages 122-125
Official site: “Ahmed Glaucoma Valve,” New World Medical, 2020
Animation: “How does the Ahmed Valve Work,” New World Medical, 2014
Animation: “(Surgical Placement of the) Ahmed Valve model PC7,” New World Medical, 2010
The UHMS Safety Committee
Neither the Undersea and Hyperbaric Medical Society (UHMS) staff nor its members are able to provide medical diagnosis or recommend equipment over the internet. If you have medical concerns about hyperbaric medicine you need to be evaluated by a doctor licensed to practice medicine in your locale, which can provide you professional recommendations for hyperbaric medicine based upon your condition. The responsibility of approving the use of equipment resides with the physician and safety director of the facility. Information provided on this forum is for general educational purposes only. It is not intended to replace the advice of your own health care practitioner and you should not rely upon it as though it were specific medical advice given to you personally.