What is the role of hyperbaric oxygen therapy (HBOT) in the treatment of delayed radiation injuries?

Updated: Nov 16, 2020
  • Author: Emi Latham, MD, FACEP, FAAEM, UHM; Chief Editor: Zab Mosenifar, MD, FACP, FCCP  more...
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Answer

Answer

Radiation therapy causes acute, subacute, and delayed injuries. Acute and subacute injuries are generally self-limited. However, delayed injuries are often much more difficult to treat and may appear anywhere from 6 months to years after treatment. They generally are seen after a minimum dose of 6000 cGy. While uncommon, these injuries can cause devastating chronic debilitation to patients. Notably, they can be quiescent until an invasive procedure is performed in the radiation field. Injuries are generally divided into soft tissue versus hard tissue injury (osteoradionecrosis [ORN]).

While the exact mechanism of delayed radiation injury is still being elucidated, the generally accepted explanation is that an obliterative endarteritis and tissue hypoxia lead to secondary fibrosis. [86] Hyperbaric oxygen therapy (HBOT) was first used to treat ORN of the mandible. Based on the foundational clinical research of Marx, [87] multiple subsequent studies supported its use. The success of HBOT in treating ORN then led to its use in soft tissue radionecrosis as well.


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