Diabetic foot ulcers are one of the most stubborn wound problems faced by people living with diabetes in South Africa. When a wound refuses to close after weeks of dressings, antibiotics and offloading, it is natural to start looking at every available option, and hyperbaric oxygen is a name that comes up early in that search.
This article walks through why these wounds are so slow to close, what actually happens to the body inside a pressurised chamber, what published research has measured so far and how hospital based hyperbaric care differs from the milder oxygen environments used in wellness settings.
Why Diabetic Foot Ulcers Are So Slow To Close
Long term high blood sugar gradually damages the small blood vessels that feed the feet. Less blood reaching the tissue means less oxygen and fewer of the nutrients and immune cells a wound needs to rebuild itself. A cut on a healthy foot might close in a week. The same cut on a foot with poor circulation can stay open for months.
Nerve damage makes the problem worse. Many people with diabetes lose sensation in their feet, so a blister from a new shoe or a small stone inside a sock goes unnoticed for days. By the time the wound is spotted it has often been walked on repeatedly, which pushes it deeper and keeps reopening the tissue that was starting to knit together.
Then there is infection. Bacteria thrive in warm, poorly oxygenated tissue, and the white blood cells that fight them need oxygen to do their job properly. This creates a frustrating loop where low oxygen allows infection to take hold, and infection raises the oxygen demand of the tissue even further. Breaking that loop is the whole aim of advanced wound care.
What Happens Inside A Pressurised Oxygen Chamber
Under normal conditions almost all the oxygen in your body travels attached to haemoglobin in your red blood cells, and those cells are already close to full. Raising the pressure around the body changes the picture, because oxygen begins dissolving directly into the blood plasma and other body fluids. This is the basic principle behind pressurised oxygen therapy for slow healing foot wounds.
Oxygen carried in plasma is not limited by blood cells reaching the tissue, so it can spread into areas where circulation is compromised. Researchers describe this as a temporary rise in the oxygen gradient between the blood and the surrounding tissue, which lasts while the person is in the chamber and for a period afterwards.
From there, the proposed mechanisms studied by researchers include stimulation of new capillary growth, increased activity of the cells that lay down collagen and improved bacterial killing by white blood cells. These are areas of active investigation rather than settled conclusions, and outcomes differ from person to person.
What The Published Research Actually Measured
Most published trials on hyperbaric oxygen for diabetic foot wounds were run in hospital based facilities using conventional clinical protocols. Participants typically breathed close to 100 percent oxygen at pressures around 2.0 to 2.5 ATA, in sessions of roughly 90 minutes, repeated 20 to 40 times, under medical supervision and alongside standard wound care.
A widely cited Cochrane review of chronic wounds reported improved ulcer healing at short term follow up in the diabetic foot group, while noting that the benefit was less clear at longer follow up and that several of the included trials had design weaknesses. Reviewers have consistently called for larger and better controlled studies before firm conclusions are drawn.
One point runs through all of this work. Hyperbaric sessions were studied as an addition to good wound care, never as a replacement for it. Blood sugar control, offloading pressure from the wound, infection management and vascular assessment remained the foundation in every protocol, and suitability was always decided by a clinical team.
How Clinical HBOT Differs From Milder Hyperbaric Environments
Not every chamber does the same thing. Conventional clinical systems pressurise to higher levels and deliver a very high oxygen concentration in a hospital environment with medical staff present. Medium and mild pressure chambers used in wellness settings operate at lower pressures, usually with air pressurisation and concentrated oxygen delivered to the user through a mask.
Those differences matter when reading anything written about hyperbaric oxygen and diabetic ulcers. Pressure, oxygen dose, session length, supervision and intended use all shape the result, so findings from one protocol cannot simply be assumed to apply to another. Lower pressure sessions are positioned around general wellness and recovery rather than the management of an open wound.
For anyone with an active foot ulcer, the practical route is a wound care team or a hospital hyperbaric facility. They can assess circulation, infection status and wound depth, then advise whether hyperbaric therapy has a role in that specific case and where it should be delivered.
In Summary
Diabetic foot ulcers heal slowly because reduced circulation, nerve damage and infection all pull in the same direction. Raising ambient pressure allows more oxygen to dissolve into the blood, and clinical research has explored this as an addition to standard wound care with encouraging short term results and acknowledged limitations. The pressure and oxygen dose used in a study always determine how far its findings reach.
If you would like to understand how a controlled oxygen environment works before deciding anything, our team is happy to talk it through. You can book a free consultation to discuss whether a Solid O2 MedHBOT wellness session suits your goals, or request a free quote if you are considering a chamber for your home or business. For an active foot ulcer, please work with your doctor or wound care team on the right next step.