Hyperbaric oxygen therapy is an adjunct to surgical fasciotomy, vascular repair, and standard trauma care for crush injury, compartment syndrome, and other acute traumatic ischemias. It supports tissue oxygenation in the ischemic zone surrounding the primary injury, reduces post-traumatic edema through hyperoxic vasoconstriction, and limits reperfusion injury when blood flow is restored. Best outcomes occur when HBOT is started within four to six hours of injury. Crush injury is recognised by Health Canada as one of the 14 conditions for which provincial health insurance covers HBOT at hospital-based programmes.
Quick Answer
Does HBOT help crush injury, compartment syndrome, and other acute traumatic ischemias? Hyperbaric oxygen therapy is an adjunct to surgical fasciotomy, vascular repair, and standard trauma care for crush injury, compartment syndrome, and other acute traumatic ischemias. It supports tissue oxygenation in the ischemic zone surrounding the primary injury, reduces post-traumatic edema through hyperoxic vasoconstriction, and limits reperfusion injury when blood flow is restored. Best outcomes occur when HBOT is started within four to six hours of injury. Crush injury is recognised by Health Canada as one of the 14 conditions for which provincial health insurance covers HBOT at hospital-based programmes.
Crush injuries are sustained when a body part is subjected to prolonged direct compression, most commonly in industrial accidents, motor-vehicle collisions, structural collapse following earthquake or building failure, prolonged entrapment after falls or assaults, prolonged immobility ("found-down" syndrome from drug overdose or stroke), and tourniquet-related ischemia. The Health Canada-recognised hyperbaric indication also covers acute peripheral arterial insufficiency from compartment syndrome (pressure-induced ischemia within a muscle compartment), threatened replantation following traumatic amputation, and acute traumatic ischemia from arterial laceration or thrombosis.
The pathophysiology is dominated by three overlapping injury patterns. The first is direct mechanical destruction of muscle, fascia, and soft tissue by the crushing force. The second is the formation of a peri-injury "zone of stasis" where tissue is partially injured, hypoxic, and at risk of progressive necrosis but is potentially salvageable with timely intervention. The third is reperfusion injury when blood flow is restored to ischemic tissue, mediated by reactive oxygen species, neutrophil-endothelial adhesion, and the systemic inflammatory cascade. Untreated, severe crush injury progresses to limb-threatening necrosis, rhabdomyolysis with myoglobin-induced acute kidney injury, and (in severe cases) compartment syndrome with definitive limb loss.
Clinical presentation includes pain disproportionate to apparent injury, tense and exquisitely tender muscle compartments, skin discoloration and bullae, paraesthesia or paresis distal to the injury, pulselessness in the late or severe stage, and (when crush syndrome develops) myoglobinuria, hyperkalemia, and acute kidney injury. Compartment-pressure measurement (Stryker needle or arterial line transducer) supports the diagnosis when clinical signs are equivocal; pressures above 30 to 40 mmHg, or a pressure differential below 30 mmHg from diastolic blood pressure, indicate compartment syndrome and the need for emergency fasciotomy. HBOT is added to (never as a substitute for) the surgical decision.
Hyperbaric oxygen therapy treats crush injury through four convergent mechanisms.
First, oxygen delivery to the zone of stasis. Inside the chamber at 2.0 to 2.5 ATA on 100 percent oxygen, plasma oxygen content rises 10- to 15-fold, raising tissue pO2 in the peri-injury zone from ischemic levels (often below 20 mmHg) to several hundred mmHg during each session. This intermittent hyperoxia keeps marginally viable cells alive long enough for the surgical and natural-healing responses to take effect.
Second, edema reduction. Hyperoxic vasoconstriction reduces capillary permeability and intramuscular fluid accumulation in well-oxygenated tissue while preserving or improving oxygen delivery to the hypoxic injury zone. The resulting reduction in compartment pressure can support post-fasciotomy management and may prevent secondary compartment syndrome in some cases.
Third, attenuation of reperfusion injury. When blood flow is restored after a period of ischemia (whether by surgical revascularisation, fasciotomy, or natural collateral recovery), the resulting burst of reactive oxygen species and neutrophil-mediated injury can extend tissue damage well beyond the initial ischemic zone. HBOT blocks neutrophil adhesion to injured endothelium, reduces lipid peroxidation, and supports endogenous antioxidant systems, limiting the secondary injury.
Fourth, support for fibroblast and angiogenic activity. The same VEGF-mediated angiogenesis that underpins HBOT's benefit in chronic wounds and radiation injury contributes to definitive healing of the post-traumatic wound bed in crush injury, particularly when soft-tissue defects require staged reconstruction.
Typical Treatment Protocol
The standard adjunctive protocol is 2.0 to 2.5 ATA on 100 percent oxygen for 90 minutes per session. The first session is typically delivered within four to six hours of injury (or as soon as the patient is hemodynamically stable after primary surgical management), with three sessions in the first 24 hours, then twice daily for days two and three, then once daily through approximately day seven. Total course is typically 7 to 14 sessions, guided by clinical response, serial muscle compartment-pressure measurements, wound bed status, and any need for further surgical procedures. The course is sometimes extended for replantation cases, severe extremity injuries with extensive zone-of-stasis tissue, or post-fasciotomy management with extensive soft-tissue defect. HBOT is delivered between surgical procedures, NEVER as a substitute for or as a delay to fasciotomy when compartment syndrome is diagnosed. The sequence is fasciotomy first (when compartment syndrome is present), vascular repair if needed, IV fluid resuscitation, HBOT third. If transfer to a hyperbaric programme would push the index fasciotomy beyond the surgical window, the local team should operate first and consider HBOT as a secondary stage.
Level B - Moderate Evidence
Supported by controlled studies and clinical evidence
The Bouachour et al. RCT (J Trauma 1996, 36 patients with severe extremity crush injury) showed significantly fewer additional surgical procedures and better wound healing in the HBOT group versus the sham group, with the largest benefit in patients aged over 40 and in those with the most severe (Gustilo III) injuries.
Animal studies including Strauss's classic series demonstrate that HBOT initiated within four to six hours of injury reduces muscle necrosis by 30 to 50 percent in experimental crush models, with diminishing benefit when treatment is delayed.
Time to first HBOT session is the strongest single predictor of outcome in published cohorts. The four-to-six-hour window from injury to first chamber session is the practical target; benefit is documented up to 24 hours and beyond, so transfer should never be aborted on time grounds alone.
Adjunctive HBOT in compartment syndrome reduces post-fasciotomy soft-tissue complications, supports earlier wound closure, and contributes to limb-salvage in extremity injuries that would otherwise progress to definitive amputation.
Standard adjunctive protocol is 2.0 to 2.5 ATA on 100 percent oxygen for 90 minutes per session, three times in the first 24 hours, then twice daily for days two and three, then once daily through day seven, for a total course of 7 to 14 sessions.
In Ontario, urgent inter-facility transfer for adjunctive HBOT after trauma is coordinated through CritiCall Ontario (1-800-668-4357), which provides 24/7 physician-to-physician triage between the trauma team and the receiving hyperbaric programme.
Highest-evidence-tier studies tagged to this condition in the Canada Hyperbarics research database, ranked by evidence tier (1 = meta-analysis or RCT, 2 = cohort, 3 = case series), most recent first.
Undersea Hyperb Med · 2025 · Study
Turk J Pediatr · 2025 · Case Report
Turkish archives of pediatrics · 2024 · Clinical Study
Cureus · 2023 · Case Study
The following hyperbaric oxygen trials related to crush injury, compartment syndrome, and other acute traumatic ischemias are currently recruiting or active at Canadian sites. Data is pulled live from ClinicalTrials.gov (refreshed every 24 hours). Speak with your physician about whether you might be eligible.
Sponsor: University of Toronto · Phase: NA · Canadian site: Toronto, Ontario
Sponsor: Ottawa Hospital Research Institute · Phase: PHASE4 · Canadian site: Victoria, British Columbia; Halifax, Nova Scotia; Kingston, Ontario; Ottawa, Ontario; Gatineau, Quebec; Laval, Quebec; Montreal, Quebec
Sponsor: Insel Gruppe AG, University Hospital Bern · Phase: PHASE4 · Canadian site: Hamilton, Ontario
Sponsor: Population Health Research Institute · Phase: PHASE3 · Canadian site: Halifax, Nova Scotia; Hamilton, Ontario; London, Ontario; Ottawa, Ontario; Montreal, Quebec
Sponsor: University of Toronto · Phase: NA · Canadian site: Toronto, Ontario
Sponsor: Hamilton Health Sciences Corporation · Canadian site: Hamilton, Ontario
Sponsor: Merck Sharp & Dohme LLC · Phase: PHASE3 · Canadian site: Calgary, Alberta; Greenfield Park, Quebec
Sponsor: Meyer Children's Hospital IRCCS · Phase: NA · Canadian site: Montreal, Canada
Sponsor: Merck Sharp & Dohme LLC · Phase: PHASE3 · Canadian site: Moncton, New Brunswick
Sponsor: McMaster University · Phase: NA · Canadian site: Winnipeg, Manitoba; Hamilton, Ontario; Ottawa, Ontario; Toronto, Ontario
Data source: ClinicalTrials.gov. Trial status updates daily. Eligibility, exclusion criteria, and consent should be discussed with your physician and the trial's principal investigator.
Most patients with crush injury or compartment syndrome arrive at hospital by ambulance through the trauma bay. The receiving emergency department coordinates initial resuscitation (IV access, fluids, pain control, tetanus and antibiotic prophylaxis), imaging, and surgical consultation. Compartment-pressure measurement is performed when compartment syndrome is suspected, and emergency fasciotomy is arranged when indicated. Vascular repair, orthopaedic stabilisation, and primary debridement of frankly necrotic tissue are completed in the trauma operating theatre.
The surgical team contacts the hospital hyperbaric programme as soon as the patient is identified as a candidate, often during the initial trauma assessment. In Ontario, urgent inter-facility transfer is coordinated through CritiCall Ontario (1-800-668-4357). The first HBOT session typically begins within hours of the index surgery, with the patient still requiring critical-care support depending on injury severity. Multiplace chambers accommodate ventilator-dependent patients with full monitoring inside the chamber.
Pressurisation takes five to ten minutes, the treatment phase is on 100 percent oxygen at 2.0 to 2.5 ATA for 90 minutes, and decompression takes another five to ten minutes. Three sessions are delivered in the first 24 hours, then twice daily, then once daily for the remainder of the course. Total course is typically 7 to 14 sessions. The trauma surgical team, orthopaedics, vascular surgery, plastic surgery (for wound coverage), and hyperbaric medicine all participate in management. Recovery from severe crush injury is typically prolonged, with rehabilitation needs (mobilisation, weight-bearing protocols, occupational therapy) extending beyond the acute treatment phase.
Crush injury, compartment syndrome, and other acute traumatic ischemias are recognised by Health Canada as one of the 14 conditions for which hyperbaric oxygen is the established adjunctive treatment. Coverage is provincial at the 11 hospital-based hyperbaric programmes across seven provinces.
In Ontario, OHIP covers treatment at the three hospital programmes (Toronto General / UHN, Hamilton General Hospital, The Ottawa Hospital). CritiCall Ontario at 1-800-668-4357 is the standard line for inter-facility transfer coordination, providing 24/7 physician-to-physician triage between the trauma team and the receiving hyperbaric programme. In British Columbia, treatment is at Vancouver General Hospital, with BC Ambulance critical-care transport for cases originating outside the Lower Mainland. In Alberta, both Misericordia Edmonton (Covenant Health) and the Foothills Medical Centre / AJECCC Calgary (Alberta Health Services) accept crush-injury referrals, with the Alberta hospital billing code 13.99I (per 15 minutes). RAMQ covers treatment at Hôpital du Sacré-Cœur de Montréal and Hôtel-Dieu de Lévis in Quebec. MSI (Nova Scotia), MCP (Newfoundland and Labrador), and Saskatchewan also cover their respective hospital programmes.
For patients in provinces or territories without an in-province hospital programme (Manitoba, New Brunswick, Prince Edward Island, Yukon, Northwest Territories, Nunavut), inter-facility transfer is arranged through the receiving province's transfer service, but only after the index surgical management has been completed at the local hospital. Industrial- and resource-sector trauma in northern Manitoba, Saskatchewan, and the territories most commonly routes to Misericordia Edmonton or the Ontario hospital programmes via Ornge or provincial air ambulance.
Hyperbaric oxygen therapy for the 14 Health Canada-recognised conditions, including Crush Injury, Compartment Syndrome, and Other Acute Traumatic Ischemias, is delivered at the 11 hospital hyperbaric programmes located in seven provinces (Ontario, Quebec, British Columbia, Alberta, Nova Scotia, Newfoundland and Labrador, and Saskatchewan). The six provinces and territories without an in-province hospital programme (Manitoba, New Brunswick, Prince Edward Island, Yukon, Northwest Territories, and Nunavut) route patients to the nearest receiving hospital programme. Use the links below for province-specific coverage, referral pathway, and emergency routing details.
Hospital + Private
OHIP (Ontario Health Insurance Plan)
Hospital Only
MSP (Medical Services Plan)
Hospital + Private
Alberta Health / AHCIP
Hospital Only
RAMQ
Disrupted
Saskatchewan Health Authority
No Hospital Chamber
Manitoba Health
Hospital Only
MSI (Medical Services Insurance)
No Hospital Chamber
Medicare NB
Hospital Only
MCP (Medical Care Plan)
Out-of-Province Referral
Health PEI
Out-of-Province Referral
Yukon Health and Social Services
Out-of-Province Referral
NWT Health and Social Services
Out-of-Province Referral
Nunavut Department of Health
For acute or emergency presentations of Crush Injury, Compartment Syndrome, and Other Acute Traumatic Ischemias, call 911 first. The receiving emergency department coordinates urgent transfer to the nearest hospital hyperbaric programme through the relevant provincial transfer network (CritiCall Ontario at 1-800-668-4357, BC Patient Transfer Network, EHS Nova Scotia, or equivalent). For diving-related emergencies, the Divers Alert Network (DAN) emergency hotline is 1-919-684-9111.
Untreated pneumothorax is the only absolute contraindication, because trapped intrathoracic air expands on decompression. Concurrent treatment with bleomycin or disulfiram are formally contraindicated but rarely encountered in acute trauma. HBOT must NOT delay fasciotomy when compartment syndrome is diagnosed. Compartment syndrome is a surgical emergency; the diagnosis dictates emergency fasciotomy without waiting for HBOT. HBOT is added after fasciotomy as part of the post-operative management. Relative contraindications, weighed against expected benefit on a per-patient basis, include severe haemodynamic instability requiring continuous high-dose vasopressor titration (chamber-side titration is more difficult), uncontrolled seizure disorder, severe chronic obstructive pulmonary disease with bullous lung disease, and uncontrolled coagulopathy. None of these typically override the hyperbaric decision in a patient with severe crush injury or threatened limb-salvage, given the high morbidity of progressive necrosis and limb loss.
Ideally within four to six hours of injury, or as soon as the patient is hemodynamically stable after primary surgical management. Three sessions in the first 24 hours at 2.0 to 2.5 ATA on 100 percent oxygen for 90 minutes each are the standard intensive phase. Earlier treatment produces better tissue salvage outcomes; benefit is still documented up to 24 hours and beyond.
In some cases, yes. HBOT supports tissue oxygenation in the peri-injury zone of stasis, reduces edema and reperfusion injury, and contributes to the limb-salvage decision-making at serial surgical reassessment. The Bouachour 1996 RCT and subsequent observational data suggest meaningful reduction in additional surgical procedures and wound complications in severe extremity crush injuries treated with adjunctive HBOT. The decision to add HBOT is made by the trauma surgical team in concert with hyperbaric medicine.
No. Compartment syndrome is a surgical emergency that requires emergency fasciotomy. HBOT does not relieve compartment pressure to the degree fasciotomy does and cannot be used to substitute for or delay surgical decompression. HBOT is added after fasciotomy as part of the post-operative management.
The Bouachour 1996 RCT and observational cohorts suggest adjunctive HBOT reduces the number of additional surgical procedures, improves wound healing, and supports limb-salvage in severe extremity crush injuries. The signal is strongest in older patients and in the most severe injuries (Gustilo III tibia fractures, for example). The evidence base is smaller than for chronic indications but consistent in direction.
Yes. Crush injury, compartment syndrome, and other acute traumatic ischemias are recognised by Health Canada and covered as an emergency indication at all 11 hospital-based hyperbaric programmes under OHIP, MSP, AHCIP, RAMQ, MSI, MCP, and Saskatchewan Health. For patients in provinces without an in-province hospital programme, urgent inter-facility transfer is arranged through provincial transfer services such as CritiCall Ontario (1-800-668-4357).
The zone of stasis is the peri-injury region of tissue that is partially injured, hypoxic, and at risk of progressive necrosis but is potentially salvageable with timely intervention. It is the primary biological target of HBOT in crush injury. By restoring tissue oxygenation in this zone, HBOT keeps marginally viable cells alive long enough for the surgical and natural-healing responses to determine the final extent of tissue loss.
Yes. Threatened replantation following traumatic amputation is one of the recognised acute traumatic ischemia indications. HBOT supports tissue survival in the marginally perfused replanted segment during the critical period before robust collateral and microvascular recovery. Standard adjunctive protocol applies; total course depends on the size of the replanted segment, the quality of the vascular repair, and the clinical course.
Typical course is 7 to 14 sessions. The first 24 hours are intensive (three sessions); days two and three are twice-daily; days four through seven are once-daily. The course is sometimes extended for replantation cases, severe extremity injuries with extensive zone-of-stasis tissue, or post-fasciotomy management with extensive soft-tissue defect.
For ventilated or critically injured patients, the chamber session feels like routine ICU care with the addition of pressurisation. Multiplace chambers accommodate stretchers, ventilators, infusion pumps, and a hyperbaric-trained nurse and physician inside the chamber. Pressurisation takes five to ten minutes and feels like an aircraft descent. The treatment phase at 2.0 to 2.5 ATA on 100 percent oxygen lasts 90 minutes. Decompression takes another five to ten minutes. The patient is continuously monitored throughout.
All 11 Canadian hospital hyperbaric programmes accept crush-injury referrals from trauma teams. The Canada Hyperbarics verified directory at canadahyperbarics.ca/facilities/ lists all programmes with phone numbers, addresses, and current operational status. In an emergency, the trauma surgical team will arrange the referral; in Ontario, this is coordinated through CritiCall Ontario at 1-800-668-4357.