When would you recommend hyperbaric oxygen treatments for skin ulceration/non-healing wounds in a radiated field?  

I agree with @Carl R. Bogardus' answer. Careful planning and attempts to avoid non-healing wounds is important, but this can happen. Conservative management should be used before hyperbaric O2 except for severe toxicities such as radiation optic neuropathy where all reasonable measures should be con...

Obviously, this is a situation that you try not to get into, but it does happen. Most commonly this will occur with a retreatment of an area that has already been heavily irradiated. It is rare to get long-term non-healing skin breakdown with conventional dosage unless the patient suffered some form...