Hyperbaric Oxygen Therapy for Necrotizing Soft Tissue Infections (NSTI)

Commonly known as “flesh-eating disease,” necrotizing soft tissue infections are devastating medical emergencies. Clinical Hyperbaric Oxygen is a primary adjunctive therapy that halts tissue death, inhibits lethal toxins, and empowers the immune system to fight back.

Intro: A Race Against Time in Surgical Infections

Necrotizing Soft Tissue Infections (NSTI) are a collection of rare but highly lethal infections that rapidly destroy the skin, fat, and fascia. Whether called necrotizing fasciitis, Fournier’s gangrene, or “flesh-eating” disease, these infections are characterized by their terrifying speed—capable of advancing several centimeters per hour through healthy tissue.

Hyperbaric Oxygen Therapy (HBOT) is an essential, life-saving clinical intervention in the management of these aggressive infections. For over three decades, clinical hyperbarics has been recognized by the Undersea and Hyperbaric Medical Society (UHMS) for its ability to stop the production of bacterial toxins, resolve the underlying tissue hypoxia, and significantly reduce the mortality and amputation rates associated with these surgical emergencies.

1. What is a Necrotizing Soft Tissue Infection (NSTI)?

NSTIs are often polymicrobial (Type I), involving a mix of aerobic and anaerobic bacteria, or monomicrobial (Type II), often involving Group A Streptococcus or Staphylococcus aureus.

The Pathological Advance: Ischemia and Necrosis

The bacteria involved in NSTIs produce specialized enzymes and toxins that cause rapid thrombosis (clotting) of the small blood vessels. This creates a state of hypoxia (severe oxygen deficiency) in the surrounding tissue. As the tissue dies (necrosis), it becomes an even better environment for the bacteria to multiply, leading to a vicious cycle of spreading death.

In this hypoxic environment, standard medical care (antibiotics) is often ineffective on its own because the blood supply to the infected area has been physically destroyed, meaning the life-saving medication cannot reach the bacteria.

2. The Pathophysiology: Halting the Infection with Oxygen

The therapeutic effect of HBOT in treating necrotizing infections is based on creating a physiological environment that is physically hostile to the bacteria and restorative to the patient’s own immune system.

Inhibiting Bacterial Toxins

Many of the bacteria responsible for “flesh-eating” disease produce lethal toxins (such as the streptococcal pyrogenic exotoxins) that cause direct tissue damage and systemic shock. Clinical fact: High concentrations of oxygen (pO2 levels achievable only in a clinical hyperbaric chamber) directly inhibit the production and release of these toxins. By “turning off” the toxin production, HBOT stops the rapid advance of the necrosis, giving the surgical team the time they need to effectively manage the patient.

Direct Bactericidal and Bacteriostatic Effects

For anaerobic bacteria, high-pressure oxygen is a direct poison. For aerobic bacteria, it acts as a “bacteriostatic” agent—it doesn’t kill them directly, but it prevents them from multiplying, essentially stalling the infection.

3. Re-energizing the Immune Response: The Oxidative Burst

One of the most critical roles of HBOT in treating NSTIs is its ability to restore the functionality of the patient’s own immune system.

The Oxygen-Dependent Kill Mechanism

White blood cells (polymorphonuclear leukocytes) are the body’s primary defense against high-grade infections. These cells use a process called the oxidative burst to physically destroy invading bacteria. This process is entirely oxygen-dependent.

In the hypoxic environment of a necrotizing infection, the white blood cells are “paralyzed” and cannot perform their function. By flooding the body with medical-grade oxygen at high pressure (typically 2.0 ATA to 2.5 ATA), HBOT provides the fuel these cells need to restart the oxidative burst, allowing the immune system to begin killing the aggressive pathogens once again.

4. The “Triple Therapy” Synergy: Surgery, Antibiotics, and HBOT

The modern medical standard for treating “flesh-eating” disease involves an integrated integration of three critical disciplines:

Wide Surgical Debridement: The urgent surgical removal of every inch of dead (necrotic) tissue.
High-Dose Intravenous Antibiotics: Targeted medications to fight the specific bacterial strains.
Hyperbaric Oxygen Therapy: Stopping the toxins, oxygenating the tissue “margins,” and empowering the immune system.

Reducing Morbidity and Mortality

Clinical research conducted by the UHMS and regional Ontario trauma centers has shown that the addition of HBOT to surgery and antibiotics significantly:

Reduces Mortality Rates: From over 35-40% to less than 10-15%.
Reduces Amputation Rates: By preserving the “borderline” tissue surrounding the infection.
Reduces the Number of Required Debridements: Because the infection is halted faster, patients require fewer surgeries to clear the area.

5. Accessing Emergency Hyperbaric Care in Ontario

In Ontario, necrotizing soft tissue infections are treated as a highest-priority medical emergency covered by provincial insurance (OHIP).

Referral Path for GTA Hospitals

Cases of suspected necrotizing fasciitis typically originate in the emergency department of a regional hospital. If the infection is rapidly progressive or involves deep fascia (as in Fournier’s Gangrene), the surgical team must coordinate immediate transport to a secondary or tertiary care facility equipped with clinical hyperbarics.

Our centralized hub in Scarborough at 525 Markham Rd provides the specialized medical-grade infrastructure and certified technicians required to manage these complex traumatic surgical cases. We work in tandem with regional hospitals to provide a seamless transition from acute care to long-term wound management and recovery.

6. Summary: Halting the Advance at the Cellular Level

“Flesh-eating” disease is a clinical crisis of rapid oxygen depletion and toxin production. High-pressure hyperbaric oxygen is the only definitive method to change the cellular environment, stop the toxins, and restore the body’s innate ability to fight back.

At TorontoHyperbaric.ca, we provide the clinical clarity and emergency recompression expertise required to manage the most complex necrotizing infections in Ontario.

To discuss clinical next steps, contact our team or review the physician referral portal.