Wounds That Won’t Heal? Hypoxia Is the Culprit! Hyperbaric Oxygen Therapy Helps Oxygenate Wounds and Promote Healing

Don’t Give Up on Chronic Wounds — Hyperbaric Oxygen Aids Healing

Why Oxygen Is Indispensable for Wound Healing

Every cell in the human body relies on oxygen to function, and wound repair is an extremely oxygen-consuming process. The growth of new blood vessels, regeneration of new skin and clearance of bacteria at the wound site all depend on oxygen.

For people with poor blood circulation around wounds, such as those with diabetes, arteriosclerosis or long-term bedridden patients, oxygen cannot be delivered adequately to the wound area. This creates a vicious cycle: hypoxia → inflammation → aggravated hypoxia → non-healing wounds. Just like parched soil that cannot nurture new life no matter how much water is added, severe cases may lead to gangrene and even amputation.

What Is Hyperbaric Oxygen Therapy (HBOT)?

Targeted oxygen supplementation is the key to breaking the cycle, which is the core principle of hyperbaric oxygen therapy.

Simply put, patients enter a sealed hyperbaric chamber to breathe 100% pure oxygen, while the chamber pressure is maintained at 2 to 3 times the normal atmospheric pressure. This is fundamentally different from conventional normobaric oxygen inhalation. Under normal atmospheric pressure, oxygen is mainly transported by hemoglobin in red blood cells. In a hyperbaric environment, oxygen can directly dissolve in blood plasma and circulate without relying on red blood cells.

Here are key data to illustrate its efficacy: At 3 standard atmospheres (ATA), the amount of oxygen physically dissolved in blood reaches 6.6 mL per 100 mL of blood — exactly equal to the arterial-venous oxygen difference under normal pressure. The oxygen dissolved in plasma alone can meet the metabolic needs of tissue cells. Oxygen penetrates edematous tissues and areas with impaired microcirculation deep into wounds, acting like an express delivery service.

Three Major Benefits of Hyperbaric Oxygen for Wound Healing

Hyperbaric oxygen therapy is far more than simple oxygen supplementation. It acts on multiple key links of wound repair to reverse the vicious cycle:

Promote angiogenesis to lay a foundation for healing

Persistent hypoxia sends out distress signals to the body. Hyperbaric oxygen stimulates the growth of new capillaries around wounds, ensuring continuous delivery of oxygen and nutrients to support tissue repair.

Kill bacteria and reduce inflammation as a natural cleanser

High-concentration oxygen generates reactive oxygen species at the wound site, which directly kill bacteria, especially anaerobic bacteria. It also enhances the bactericidal effect of antibiotics to control wound infections.

Relieve swelling and pain to end the hypoxia cycle

Hypoxia causes tissue swelling, which in turn compresses blood vessels and further blocks oxygen supply. Hyperbaric oxygen improves local microcirculation and reduces edema, putting wounds back on a healthy healing track.

Clinical Outcomes of Hyperbaric Oxygen Therapy

A review in Cureus analyzed 15 years of data from 11 clinical studies covering diabetic foot ulcers, venous leg ulcers, post-operative refractory wounds and other chronic wounds, with solid results as follows:

Markedly higher complete healing rate

A 2020 study by Kumar et al. showed that 78% of patients in the hyperbaric oxygen group achieved complete wound healing without surgery, compared with 0% in the control group. Salama’s team found in 2019 that the 8-week complete healing rate reached 66.7% in the treatment group, versus only 20% in the control group.

Faster wound shrinkage

In a 2018 trial by Thistlethwaite, wound area decreased by an average of 95% in the hyperbaric oxygen group, while the placebo group saw a 54% reduction. In Salama’s research, wound area shrank by 73.3% in the treatment group and merely 6.25% in the control group; all wounds in the treatment group fully healed within 8 weeks.

Greatly reduced amputation risk

A 2020 study by Shukla et al. reported an amputation rate of only 4% in the hyperbaric oxygen group, compared with 24% in the control group, effectively helping patients preserve their limbs.

Reduced bacterial load, relieved pain and improved quality of life

Laboratory tests prove hyperbaric oxygen inhibits the activity of bacterial biofilms and lowers bacterial levels in wounds. The average healing time was shortened from 6.6 weeks to 5.8 weeks. Patients’ average pain scores dropped from 7.1 to 2.2 points, the maximum pain-free walking distance increased from 0 meters to 190.6 meters, and the proportion of patients capable of independent daily activities rose from 25% to 55.5%.

Who Is Suitable for Hyperbaric Oxygen Therapy?

This therapy is not for all wounds. It is most recommended for patients with chronic wounds unresponsive to conventional treatments (including dressing changes, decompression and anti-infection therapy). The following groups gain the most significant benefits:

Patients with diabetic foot ulcers

Patients with venous leg ulcers

Patients with ischemic ulcers caused by thromboangiitis obliterans

Patients with post-operative refractory wounds

Patients with stubborn wounds unresponsive to standard treatment

Immediate medical assessment for hyperbaric oxygen therapy is advised for those with warning signs: wounds graded Wagner Stage 4 or above (deep infection or gangrene), elderly patients with long-standing wounds, and patients with transcutaneous oxygen pressure (TcPO₂) below 40 mmHg (severe local hypoxia).

Safety and Potential Side Effects

Hyperbaric oxygen therapy is generally safe, and most adverse reactions are mild and manageable. Doctors will conduct a comprehensive physical assessment before treatment:

The most common symptom: ear discomfort, similar to ear pressure during air travel.

Temporary blurred vision in some patients.

Claustrophobia in a small number of people due to the enclosed chamber.

Severe complications such as pneumothorax and oxygen toxicity are extremely rare.