Radiation therapy has come a long way since its inception. Radiation therapy, also called radiotherapy, first developed in the late 1890’s after the discovery of the x-ray in 1896. The treatment involves the use of high energy waves such as gamma rays, electron beams, protons or x-rays to destroy tumors. For many years, radiation therapy involved an uncontrolled blast to the affected region of the body, which often resulted in damage to surrounding healthy tissues and in some cases, new forms of cancer. Fortunately, advanced technologies are continually being developed to target smaller, localized areas as close to tumor sites as possible to reduce damage. While science is getting closer to eliminating radiation injuries, they aren’t there quite yet. Many radiation patients still suffer with burns, tissue death, inflammation, infections and other side effects as a result of their treatments.
Hyperbaric therapy for radiation damage is well studied and commonly utilized in oncology wards all over the world. Radionecrosis (tissue death) has been successfully treated and documented, as well as internal and external burns, infections and open wounds. Hyperbaric therapy positively affects the genes involved in inflammation control and tissue repair. Anecdotes and testimonials show that some patients experience recovery even years after their initial treatment and injuries.
"There will be 1.2 million cases of invasive cancer diagnosed in the United States this year. Half of those patients will receive radiation therapy as part of their treatment program. Serious radiation complications will occur in 5% of patients receiving radiation therapy. This represents about 30,000 cases per year."
"Treatment protocols vary depending on the treated tissue.
Robert Marx, DDS did most of the work elucidating the benefit of hyperbaric oxygen for treatment of osteoradionecrosis of the mandible in patients who received head and neck radiation. Osteoradionecrosis of the jaw is the result of an aseptic, avascular necrosis of the bone. Marx showed that for hyperbaric oxygen to be consistently successful, it must be combined with surgery and antibiotic therapy. The major principals elucidated by Marx in the treatment and prevention of ORN include an emphasis on pre-surgical hyperbaric oxygen to improve tolerance to surgical wounding. These patients typically receive 20 pre-extraction treatments followed by ten post-extraction hyperbaric oxygen treatments.
Laryngeal necrosis and other soft tissue necrosis of the head and neck due to late effects of radiation therapy have been successfully treated with hyperbaric oxygen to improve tissue quality both preoperatively and postoperatively and to improve survival of surgical flaps in previously irradiated head and neck tissues.
A growing body of literature supports the use of hyperbaric oxygen therapy in the prevention of radiation injury. This is usually in the setting of proposed surgery within a previously irradiated field where the likelihood of complications and difficult wound healing is high.
At present, a reasonable approach is to provide adjunctive hyperbaric oxygen treatments when surgery in heavily irradiated tissue bed is planned."
See full study here.
Radiation injury to tissues (radionecrosis, radiation necrosis, osteoradionecrosis) is a complication or "side effect" of radiation therapy for a tumor. This occurs because the radiation can damage normal cells as well a tumor cells. Destruction of nutrient blood vessels in the irradiated area can result in local poor or non-healing wounds (ulceration), destruction of bone (necrosis) and bleeding.
Radiation therapy for pelvic or abdominal tumors may result in bleeding or other symptoms. Bleeding from the bladder (radiation cystitis), small bowel (radiation enteritis) or rectum (radiation proctitis) are the most common complications. Symptoms of frequency, urgency, pain, incontinence and diarrhea may be experienced as well.
Radiation treatments for head and neck cancer can cause long term damage (necrosis) to the jaws, teeth and throat. Local non-healing wounds (ulceration) and decaying teeth (dental carries) are the most common side effects but may also include difficulty eating or swallowing, dry mouth or hoarseness.
Radiation of the chest for breast or lung cancer may result in soft tissue radionecrosis of the chest wall with symptoms of reduced range of motion or swelling of the lymph nodes.
Hyperbaric oxygen (HBO2) is effective treatment for radiation tissue injury. Since the 1970s, surgeons of the head and neck region have come to recognize the value of hyperbaric oxygen treatments in treating radiation therapy damage of the jaw bone. Hyperbaric oxygen has had some of its most dramatic successes in treating or preventing damage to the jaw bone and is the treatment of choice for osteoradionecrosis. Hyperbaric oxygen therapy has also been used to treat radiation therapy damage of the brain, muscle and other soft tissues of the face and throat as well.
Virginia Mason Center for Hyperbaric Medicine patients are seen at the Seattle Main Clinic. In Virginia Mason's extensive experience treating radiation injury to the bladder (cystitis), 82 percent of patients have improved. Among patients treated at Virginia Mason for injury to the bowel (enteritis) or rectum (proctitis), approximately 70 percent have shown improvement. No other treatment for radiation cystitis or radiation proctitis actually heals the injured tissue as well as hyperbaric oxygen therapy.
Surgery in a previously irradiated field may be accompanied by wound healing problems. When such surgery is performed, the addition of hyperbaric oxygen treatment may reduce wound breakdown, postoperative wound infections, and shorten healing times.
Decisions to manage chronic radiation tissue injury with hyperbaric oxygen therapy should be made by your managing physician, in consultation with an experienced hyperbaric physician.
While cancer specialists would irradiate only cancer cells if they could, healthy cells are unavoidably affected. Cells that have a high rate of growth, such as those in the bowel, bladder, mouth and throat, are more sensitive to radiation damage. While acutely damaged cells have enough repair abilities to return to normal, the chronic condition shows radiation caused scarring and narrowing of the blood vessels resulting in poor blood supply. If this process progresses to the point that the normal tissues are no longer receiving an adequate blood supply, death or necrosis of these tissues can occur.
Hyperbaric oxygen uses high concentrations of oxygen to repair the damaged vessels and tissues. The air we breathe contains 21 percent oxygen. This can be increased to 100 percent if oxygen is breathed via a mask or hood (personalized oxygen tent surrounding your head). The body's oxygen supply can be increased by a further two or three times by entering a hyperbaric chamber and receiving 100 percent oxygen at increased pressure. Oxygen administered in this manner is dissolved in the blood stream and delivered to body tissues at a far greater concentration. This high dose of oxygen is carried in the patient's circulation to the site of injury to assist in the repair of not only the damage tissue but also to the damaged blood vessels as well.
During HBO2 therapy for radiation tissue injury, oxygen is administered as a series of 30 to 40 treatments. For long-lasting results, the entire series of treatments must be completed. These treatments take about two hours and are delivered once or twice daily.
See full article here.
Click here to read full article from Virginia Mason.
Hyperbaric Oxygen Therapy for Radiation-Induced Cystitis and Proctitis
Caspian Oliai, M.D., Brandon Fisher, D.O., Ashish Jani, M.D., Michael Wong, M.D.,
Jaganmohan Poli, M.D., Luther W. Brady, M.D., Lydia T. Komarnicky, M.D.
Department of Radiation Oncology, Drexel University College of Medicine, Philadelphia, Pennsylvania
To provide a retrospective analysis of the efficacy of hyperbaric oxygen therapy (HBOT) for treating hemorrhagic cystitis (HC) and proctitis secondary to pelvic- and prostate-only radiotherapy.
Methods and Materials
Nineteen patients were treated with HBOT for radiation-induced HC and proctitis. The median age at treatment was 66 years (range, 15–84 years). The range of external-beam radiation delivered was 50.0–75.6 Gy. Bleeding must have been refractory to other therapies. Patients received 100% oxygen at 2.0 atmospheres absolute pressure for 90–120 min per treatment in a monoplace chamber. Symptoms were retrospectively scored according to the Late Effects of Normal Tissues—Subjective, Objective, Management, Analytic (LENT-SOMA) scale to evaluate short-term efficacy. Recurrence of hematuria/hematochezia was used to assess long-term efficacy.
Four of the 19 patients were lost to follow-up. Fifteen patients were evaluated and received a mean of 29.8 dives: 11 developed HC and 4 proctitis. All patients experienced a reduction in their LENT-SOMA score. After completion of HBOT, the mean LENT-SOMA score was reduced from 0.78 to 0.20 in patients with HC and from 0.66 to 0.26 in patients with proctitis. Median follow-up was 39 months (range, 7–70 months). No cases of hematuria were refractory to HBOT. Complete resolution of hematuria was seen in 81% (n = 9) and partial response in 18% (n = 2). Recurrence of hematuria occurred in 36% (n = 4) after a median of 10 months. Complete resolution of hematochezia was seen in 50% (n = 2), partial response in 25% (n = 1), and refractory bleeding in 25% (n = 1).
Hyperbaric oxygen therapy is appropriate for radiation-induced HC once less time-consuming therapies have failed to resolve the bleeding. In these conditions, HBOT is efficacious in the short and long term, with minimal side effects.
Hyperbaric oxygen therapy for radiation induced proctopathy in men treated for prostate cancer
Purpose: Radiation proctitis is a common complication following external beam radiation therapy and brachytherapy for prostate cancer. While 95% percent of radiation induced proctitis is temporary and self-limiting, up to 5% of patients experience toxicities that are refractory to conservative management. Hyperbaric oxygen has a well-defined role in treating chronic wounds, osteomyelitis, hemorrhagic cystitis and necrotizing fasciitis. We reviewed our experience with hyperbaric oxygen therapy for radiation induced proctitis in patients undergoing radiation treatment for prostate cancer.
Materials and methods: From October 1998 to December 2003, 27 patients with radiation induced proctitis secondary to brachytherapy (4), external beam radiation therapy (16) or combined modality (7) for prostate cancer were treated with hyperbaric oxygen therapy at Virginia Mason Medical Center in Seattle, Washington. In all patients primary medical or endoscopic management had failed. Patients received 100% oxygen in a multiplace hyperbaric chamber at a pressure of 2.4 atmospheres absolute for 90 minutes 5 to 7 days weekly for an average of 36 sessions (range 29 to 60). Data were collected from a retrospective review of medical records following approval by the Institutional Review Board at Virginia Mason Medical Center.
Results: All 27 men completed the planned course of therapy. Of patients with bleeding 48% showed complete resolution after therapy, while 28% reported significantly fewer bleeding episodes. Of patients 50% noted complete resolution of fecal urgency. Six of the 8 patients (75%) with pain noticed some improvement after therapy, although no patients reported complete resolution of rectal pain. Of patients with rectal ulceration 21% showed complete resolution of the ulcer on posttreatment endoscopy, while 29% showed evidence of improvement. Six patients (43%) had no change or worsening of rectal ulcers. Overall 67% of patients had a partial to good response, while 33% showed no response or disease progression.
Conclusions: This series of patients showed a good overall response rate to hyperbaric oxygen for radiation induced proctopathy after other attempts at management had failed. Hyperbaric oxygen is generally well tolerated and it remains an important treatment option for managing this common and difficult disease.
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Purpose: Radiotherapy is effective in the treatment of tumors in the pelvic area but is associated with side effects such as cystitis and proctitis. Hyperbaric Oxygen Therapy (HBOT) has emerged as a treatment modality for radiation-induced side effects. In a rat model for radiation cystitis, we studied the effects of HBOT on oxidative stress and pro-fibrotic factors.
Materials and methods: Sedated Sprague-Dawley rats underwent bladder irradiation of 20Gy with and without 20 sessions of HBOT during a fortnight. Control animals were treated with and without HBOT. All four groups of animals were euthanized 28 days later. Histopathological examinations, immunohistochemistry and quantitative polymerase chain reaction (qPCR) were used to analyze changes in oxidative stress (8-OHdG), anti-oxidative responses (SOD-1, SOD2, HO-1 and NRFα) and a panel of Th1-type and Th2-type cytokines (IL-1β, IL-4, IL-5, IL-6, IL-10, IL-13, TNF-α, TGF-β, IFN-γ) in the urinary bladder.
Results: Bladder irradiation increased the expression of 8-OHdG, SOD2, HO-1, NRFα, IL-10, TNF-α and tended to increase TGF-β. These changes were completely reversed by HBOT while HBOT in control animals had no effects on the studied markers for oxidative stress, anti-oxidative responses and Th1-type and Th2-type cytokines.
Conclusions: Radiation induced a significant elevation of oxidative stress, antioxidants and pro-fibrotic factors in our animal model for radiation cystitis that were completely reversed and normalized by HBOT. Our findings indicate that HBOT may prevent radiation-induced changes by affecting oxidative stress and inflammatory cascades induced by radiation.
Summary: Radiotherapy may cause the development of chronic inflammation and fibrosis, significantly impairing organ function. We hypothesized that bladder irradiation induces an oxidative stress reaction, thereby triggering the redox system and thus initiating an inflammatory and pro-fibrotic response. We aimed to assess whether these changes would be reversed by hyperbaric oxygen using an animal model for radiation cystitis. Our study show that hyperbaric oxygen therapy may reverse oxidative stress and pro-inflammatory factors induced by radiation.
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