Vascular Surgery & Infectiology & Emergency Medicine
Gangrène | Clinique Omicron Québec
Gangrene is the necrosis of a tissue or organ resulting either from prolonged ischemia (interruption of vascular supply), infection by toxin- or lytic enzyme-producing micro-organisms, or a combination of both. It represents a surgical and medical emergency, whose vital and functional prognosis depends on rapid diagnosis and intervention. Clinical classification distinguishes between dry gangrene (ischemic, non-infected), wet gangrene (ischemic and infected) and gas gangrene (infection with gas-producing anaerobic germs, dominated by Clostridium perfringens). Necrotizing soft-tissue infections - including necrotizing fasciitis and Fournier's gangrene - are the most dreaded forms, with mortality exceeding 30 % even in specialized centers. In Quebec, the main contributing factors are diabetes mellitus (which increases the risk of lower-limb gangrene by a factor of 10 to 50), obliterative arteriopathy of the lower limbs, undernutrition, immunodepression and contaminated traumatic wounds. Management is based on aggressive surgical debridement - sometimes amputation - broad-spectrum antibiotic therapy and, in certain indications, hyperbaric oxygen therapy.
Classification, pathophysiology, and risk factors
- Dry Gangrene — Pathophysiology and Presentation: Mechanism: Progressive arterial occlusion (atherosclerosis + peripheral arterial disease - PAD) → chronic ischemia → distal tissue necrosis due to lack of oxygen and nutrients → drying of necrotic tissue (mummification) in the absence of significant bacterial contamination → clear demarcation line between living and necrotic tissue; Clinical presentation: distal extremities (toes + forefoot + heel) + black tissue + dry + mummified + retracted + painless (destruction of sensory nerve fibers) + faint or absent odor + clear boundary between necrotic and viable zone (demarcation line) + absent or very diminished dorsalis pedis and posterior tibial pulses + ABI (Ankle-Brachial Index) <0.4 typically; etiologies of dry gangrene: AOMI stage IV (Leriche-Fontaine) → most frequent cause in Quebec + arterial embolism (AF + emboligenic heart disease) + acute arterial thrombosis on atheroma (thrombosis in situ) + Buerger syndrome (thromboangiitis obliterans - heavy smoker + young man) + calciphylaxis (chronic renal failure + secondary hyperparathyroidism + calcium deposits in small cutaneous vessels) + deep frostbite (freezing gangrene - cold ischemia) + ergotism (rye ergot - exceptional); treatment of dry gangrene : revascularization if possible (angioplasty + vascular bypass) → limit extent of necrosis + amputation if extensive necrosis or revascularization impossible → level of amputation: transtibial or transfemoral depending on residual vascularization → WIFI (Wound Ischemia Foot Infection) score: tool for stratifying amputation risk in critical foot ischemia → multidisciplinary decision (vascular surgeon + podiatrist + endocrinologist).
- Wet gangrene and gas gangrene — pathophysiology: wet gangrene: mechanism: ischemia + bacterial contamination → liquefying necrosis (bacterial proteases + local inflammatory response) → edematous + moist + blackish or greenish + malodorous tissue + blurred boundary between necrotic and healthy zone → risk of rapid progression and systemic sepsis → more frequent than dry gangrene in diabetics (neuropathy + microangiopathy + polymicrobial infections) + germs: polymicrobial → staphylococci + streptococci + enterobacteria + anaerobes (Bacteroides + Fusobacterium + Peptostreptococcus); gas gangrene (clostridial myonecrosis): mechanism: Clostridium perfringens (90 %) + C. septicum + C. histolyticum → spore-forming anaerobes → produce potent toxins: alpha-toxin (lecithinase C → lysis of cell membranes → hemolysis + muscle necrosis) + hyaluronidase + collagenase + gas (CO₂ + H₂) → rapid gas diffusion into tissue planes → pathognomonic subcutaneous crepitus + fulminant toximic shock; clinical presentation of gas gangrene: abrupt onset (6-24h after wound or surgical procedure) + disproportionately intense pain + edema + bronze then black skin + serohemorrhagic bullae + snowy crepitation on palpation (gas in tissue) + characteristic sweet odor + rapidly fulminating sepsis → hypotension + tachycardia + confusion + anuria → mortality without immediate treatment: 100 %; factors favoring gas gangrene: deep traumatic wounds contaminated with soil (clostridial spores) + colonic or gynecological surgery (perforation + fecal contamination) + IM injection (spore-contaminated heroin) + foreign body + tissue ischemia (vascular terrain + diabetes)
- Necrotizing soft tissue infections — Guillou classification: necrotizing soft-tissue infections (NSI) group together several entities depending on the anatomical layers affected and the micro-organisms involved; anatomical classification: deep infectious cellulitis (superficial necrotizing fasciitis) → involvement of superficial subcutaneous tissue + superficial fascia → type I necrotizing fasciitis (polymicrobial - 80 % of cases) : aerobic + anaerobic bacteria → bacterial synergism → lightning progression → risk factors: diabetes + obesity + immunodepression + digestive or urogenital surgery + type II necrotizing fasciitis (monomicrobial - 20 % - group A streptococcus - GAS - Streptococcus pyogenes) : healthy adults + often without risk factors + onset with a minor wound + rapid progression + streptococcal toxins (pyrogenic exotoxins A + C) → streptococcal toximic shock syndrome (SCTS) → mortality 30-70 % + non-clostridial bacterial myonecrosis: Staphylococcus aureus + SGA → muscle damage + Fournier gangrene : perineoscrotal or vulvar necrotizing fasciitis → polymicrobial + aero-anaerobic synergism → «burnt cellophane» progression along perineal fascias (Colles' fascia + Buck's fascia); LRINEC score (Laboratory Risk Indicator for Necrotizing Fasciitis): screening tool for necrotizing fasciitis - calculated on 6 biological parameters: CRP (≥150 mg/L: 4 points) + WBC (WBC >15 × 10⁹/L: 1 point or <25 × 10⁹l : 2 points) + sodium (<135 mmolcréatinine (>141 µmol/L : 2 points) + glycemia (>10 mmol/L : 1 point) + Hb (<110 g/L : 2 points) → score ≥6 → intermediate risk of INTM → score ≥8 → high risk → urgent surgery — but: sensitivity 59–77 % → a low score does not rule out necrotizing fasciitis → if strong clinical suspicion → surgical exploration without delay
Diagnosis, antibiotic therapy, and surgical management
| Clinical situation | Diagnosis and assessment | Treatment and follow-up |
|---|---|---|
| Necrotizing fasciitis — surgical emergency Type I — Type II — LRINEC — emergency debridement |
Necrotizing fasciitis is the most common necrotizing soft-tissue infection - its diagnosis is above all clinical, and its surgical management should suffer no delay; clinical warning signs (the «6th sense of the surgeon» by Wong 2004): pain disproportionate to the apparent cutaneous appearance (earliest and most important sign) + tense oedema exceeding the limits of cutaneous erythema + deep woody induration on palpation (involvement of underlying fascia) + greyish or bronze skin + haemorrhagic bullae + crepitation (if gaseous component) + cutaneous hypoesthesia or anesthesia (destruction of nerve nets by necrosis) + early systemic signs: fever + tachycardia + hypotension + sepsis → the cutaneous picture may initially be misleading (banal erythema) → progression within a few hours is pathognomonic; biological workup (LRINEC + infectious workup): CBC: leukocytosis + anemia + thrombocytopenia (incipient DIC) + CRP + PCT + venous lactate + creatinine + liver workup + blood glucose + ionogram + PT + APTT + fibrinogen + D-dimer (DIC) → LRINEC calculated + blood cultures × 2-3 pairs + swabs of lesions (anaerobes ++); imaging: CT of suspicious areas with contrast injection: subcutaneous and muscular emphysema (gas in planes) + thickening and enhancement of fascia + deep collections → CT sensitivity: 88-93 % for INTM - but DO NOT delay surgery to perform CT if clinical picture is suggestive → surgical decision is clinical + finger test: 2 cm skin incision under local anaesthetic + introduction of finger into wound → absence of resistance to digital dissection of fascial planes (necrotic fascia does not bleed + does not resist) + absence of bleeding + greyish appearance and cloudy liquid (brown exudate known as «dishwater») → positive test → necrotizing fasciitis confirmed → surgery in absolute emergency | Principles of surgical treatment of necrotizing fasciitis (IDSA 2014 + CSSF 2022 recommendations): urgent radical surgical debridement: wide incision extending beyond suspicious areas → excision of all necrotic tissue down to healthy margins (bleeding tissue + resistant to dissection) → systematic checking of all planes (TCS + superficial fascia + deep fascia + muscle if associated myonecrosis) → always wider than skin appearance suggests → fasciotomy alone is insufficient → recut-returns to surgical block at 24-48h to check margins (2nd + 3rd look) until no progression + reconstruction: delayed secondary closure (10-14 days) + thin skin graft after complete cleansing → directed healing with negative pressure healing system (VAC therapy - Vacuum-Assisted Closure) bridging to graft; emergency empirical antibiotic therapy (IV - before microbiological results): necrotizing fasciitis type I (polymicrobial) : piperacillin-tazobactam 4.5 g IV × 4/d + clindamycin 600-900 mg IV × 3/d (inhibits toxin synthesis → additional benefit independent of antibacterial activity) ± vancomycin (if MRSA suspected - IVDU + MRSA history) + necrotizing fasciitis type II (SGA - streptococcus A): penicillin G 4 MU IV × 6/d + clindamycin 600-900 mg IV × 3/d → combination PCN G + clindamycin is more effective than penicillin alone (Eagle effect - SGA in stationary phase express little PBP → beta-lactams less effective → clindamycin inhibits protein synthesis + toxin production); polyvalent immunoglobulin IV (IVIG): IVIG 1-2 g/kg single dose → neutralize streptococcal superantigens → reduced mortality in streptococcal toxic shock - level II data (INSTINCT trial - Lancet Infect Dis 2021: no significant reduction in mortality at 28d but reduction in AKIN - acute kidney injury network score) → use according to local protocols + reserved for severe SCTS |
| Gas gangrene (clostridial myonecrosis) C. perfringens — alpha-toxin — surgery + HBO |
Gas gangrene is the most fulminant infection known to human medicine - without surgical treatment within the first 6 hours, mortality is almost certain; clinical and paraclinical diagnosis: suggestive context: contaminated traumatic wound (accidental + surgical + IV/IM injection) + incubation period: 6h-3 days (usually <24h) → early local signs: intense «pressure-like» wound pain + tense edema + pale then bronze then blackish skin + brown serohemorrhagic exudate + sweet odor (organic acids produced by Clostridium) + bubbles + pathognomonic snowy crepitus (H₂ + CO₂ gas in tissues) → centripetal progression visible at eye speed → fulminant systemic signs: fever + agitation + shock + jaundice (hemolysis by alpha-toxin) + hemoglobinuria + renal failure + DIC + death in 6-12h without treatment; imaging: standard Rx: muscular gas emphysema (bubbles between muscle fascias - «fern feather» appearance) → CT: extensive intramuscular gas + diffuse edema → DO NOT delay surgery for imaging; bacteriology: Gram-stained smear: large «cigar box» Gram-positive bacilli without polynuclei (local leukopenia due to leukotoxins) → anaerobic culture: Clostridium perfringens (growth in 24-48h) → blood cultures: positive in 15-20 % → very high CPK (massive muscle necrosis) + high LDH + hypocalcemia (fat saponification) + hemolysis (free Hb + hemoglobinuria) | Treatment of gas gangrene - therapeutic triad: urgent radical surgery (absolute priority - «life over limb»): emergency amputation or disarticulation if limb is affected → do not attempt conservative debridement in extensive clostridial myonecrosis → amputation is curative + life-saving → wide debridement with decompressive fasciotomies and excision of all necrotic muscle tissue → recut-returns at 24-48h + emergency IV antibiotic therapy: penicillin G 4 MU IV × 6/d + clindamycin 600-900 mg IV × 3/d → in case of penicillin allergy: carbapenem (meropenem 1 g × 3/d) + clindamycin → metronidazole 500 mg IV × 3/d adjuvant if associated Gram-negative anaerobes → duration: at least 10-14 days depending on clinical course; hyperbaric oxygen therapy (HBOT): 100 % O₂ at 2.5-3 absolute atmospheres × 90-120 min → 3 sessions the first 24h then 2 sessions/d until stabilization → beneficial mechanisms: increased tissue pO₂ → direct bacteriostatic and bactericidal effect on strict anaerobes (Clostridium) + inhibition of alpha-toxin production + sharper demarcation of necrosis → potentially reducing mortality and extent of amputations (retrospective cohort data + Tibbles 1993 trial) → HBOT is an adjuvant - never replaces surgery and should never delay it → availability in Quebec: HBOT units: CHU de Québec-Université Laval (CHUL) + CISSS de Chaudière-Appalaches (some centers) → inter-hospital transfer if necessary after initial surgical stabilization; passive anti-alpha-toxin immunotherapy: clostridial antitoxin → not commercially available in Canada → reserved for research protocols → polyvalent IVIG has no documented benefit in gas gangrene |
| Fournier's gangrene Perineum — FGSI score — debridement — colostomy |
Fournier's gangrene is a perineo-scrotal or vulvar necrotizing fasciitis of polymicrobial origin - it represents the most severe form of adult necrotizing fasciitis with a mortality of 20-40 % even in specialized centers; epidemiology and risk factors: prevalence in men: 10× more frequent than in women + average age: 50-60 years + favoring factors: diabetes mellitus (60-70 % of cases) + obesity + chronic alcoholism + immunosuppression (corticosteroid therapy + HIV + chemotherapy) + SGLT2 inhibitors (gliflozins - empagliflozin + dapagliflozin) : FDA 2018 + Health Canada pharmacovigilance signal → increased risk of Fournier gangrene (mechanism: glycosuria + altered urogenital microbiome + conditions favorable to anogenital infections) → patient information + reporting of any cases to Health Canada; clinical presentation: initial anogenital pain and pruritus → edema + progressive erythema of the bursae or vulva + induration + bullae → crepitation (if gaseous component) → visible cutaneous necrosis → rapid septic state → systemic signs: fever + chills + sepsis → the perineum may appear little affected on the surface whereas necrosis is extensive in depth (along the fascias of Colles + Buck + Scarpa); FGSI (Fournier's Gangrene Severity Index) score: assesses severity on admission → 9 physiological parameters (temperature + HR + FR + Na + K + creatinine + Hct + WBC + bicarbonates) → score ≥9 → estimated mortality >75 % → score <9 → mortality <23 % → aids decision-making but should never delay surgery; paraclinical workup: CBC + CRP + PCT + blood cultures + ECBU + blood glucose + renal assessment + HbA1c → pelvic CT scan with injection: thickening of perineal fasciae + gaseous emphysema + collections → delineates extension to abdominal wall fasciae + proctological assessment (anal fistula + triggering rectal pathology) | Treatment of Fournier gangrene (WSES recommendations - World Society of Emergency Surgery 2020): emergency surgery - radical perineal debridement : excision of all necrotic tissue down to healthy margins + check for extension to abdominal wall (Scarpa's fascia) + thigh (fascia lata) + posterior perineum (Colles' fascia) → testes are often spared (spermatic vascularization independent of perineal fascias) → orchiectomy only if directly necrotic testicle → suprapubic or urethral urinary catheterization (urinary diversion) → diversion colostomy: discussed - recommended if: anorectal involvement + fecal incontinence + fecal contamination of wound → reduces superinfections + facilitates healing → decision on a case-by-case basis + surgical recutting-returns: at 24-48h + daily until no progression → healing by VAC therapy (negative pressure) → remote skin grafting + empirical IV antibiotic therapy: piperacillin-tazobactam 4.5 g × 4/d + clindamycin 600-900 mg × 3/d ± vancomycin (if MRSA suspected) ± fluconazole (if Candida at risk - diabetes + immunodepression + corticosteroid therapy) → adapt according to cultures + antibiograms (blood cultures + intraoperative samples) → duration: until healing of healthy edges (often 2-4 weeks) + adjuvant HBOT: same indications and modalities as in gas gangrene → benefit suggested by several retrospective series → no randomized trial + intensive nutritional support: severe undernutrition + hypercatabolism → enteral or parenteral nutrition + strict glycemic control (target 6-10 mmol/L) + transfer to specialized tertiary surgical center if unavailable locally |
| Diabetic foot gangrene Diabetic foot — WIFI — multidisciplinary team — amputation |
The gangrenous diabetic foot represents the most serious complication of diabetes in terms of mortality and functional morbidity - it is responsible for more than 60 % of non-traumatic amputations in Quebec and Canada; pathophysiology of the diabetic foot: three interrelated mechanisms: diabetic peripheral neuropathy: loss of protective sensitivity → repeated painless trauma → unrecognized wounds → infection → gangrene + microangiopathy (diabetes) + macroangiopathy (accelerated AOMI) → distal ischemia → poor healing + increased susceptibility to infection → high blood glucose → neutrophil dysfunction (chemotaxis + phagocytosis) + reduced tissue growth factors + bacterial proliferation; Wagner classification of the diabetic foot: grade 0: no wound → high risk → prevention + grade 1: superficial ulcer (epidermal-dermal) → wound care + grade 2: deep ulcer (down to tendon + joint capsule) → antibiotic therapy + specialized care + grade 3: deep ulcer + osteomyelitis or abscess + grade 4: gangrene of a toe or forefoot + grade 5: extensive gangrene of the foot → amputation + WIFI (Wound Ischemia Foot Infection) score: more recent and more precise classification - 3 parameters: W (wound - depth and extent) + I (ischemia - IPS + TcPO₂ + pulsatile toe pressure) + FI (foot infection - IDSA 2012: mild + moderate + severe) → WIFI score 1-3 → low-to-moderate risk of amputation → attempt revascularization + local care + WIFI score 4 → high risk → amputation discussed from the outset + microbiology of the infected diabetic foot: mild-moderate infections: skin germs - S. aureus + β-hemolytic streptococci (group B + G) + severe or chronic infections: polymicrobial - enterobacteria + Pseudomonas + anaerobes + MRSA (if previous antibiotic therapy + hospitalization + CHSLD) → quality samples: bone biopsy if osteomyelitis suspected (gold standard) + deep curettage (superficial swabbing → limited value) | Multidisciplinary management of gangrenous diabetic foot (IWGDF 2023 recommendations - International Working Group on the Diabetic Foot + Diabetes Canada 2023): multidisciplinary team: family physician + diabetologist + vascular surgeon + orthopedic surgeon or surgical podiatrist + infectiologist + wound care nurse + podiatrist + nutritionist + social worker; revascularization (if critical ischemia): percutaneous transluminal angioplasty (PTA): 1st intention if femoral + iliac lesions + distal bypass (femorotibial + peroneal + pedal bypass): if PTA impossible or failure → autologous saphenous vein → post-revascularization target IPS ≥0.7 + TcPO₂ ≥30 mmHg → minimal conditions for healing; antibiotic therapy of the infected diabetic foot (IDSA 2012): mild infection (cellulitis 2 cm + subcutaneous involvement): amoxicillin-clavulanate IV or cefazolin IV → if MRSA → TMP-SMX PO or vancomycin IV → 2-4 weeks + severe infection (sepsis + gangrene + osteomyelitis): piperacillin-tazobactam IV ± vancomycin → depending on cultures → 4-6 weeks if osteomyelitis (osteomyelitis → bone biopsy + culture + target antibiotic therapy + sometimes bone resection or partial amputation); gangrenous diabetic foot surgery: debridement + local amputation (toe + radius + forefoot) → limb salvage if sufficient residual vascularization → remote skin graft → local care : off-loading (orthosis + wheelchair) + bioactive dressings + VAC therapy if deep wound; prevention of gangrenous diabetic foot: daily foot inspection + adapted footwear + regular podiatric care + HbA1c <7 % + control of vascular risk factors + annual screening for neuropathy (10 g Semmes-Weinstein monofilament + 128 Hz tuning fork) + AOMI (IPS + arterial doppler of lower limbs) |
| Hyperbaric Oxygen Therapy (HBOT) and adjuvant treatment Indications — protocols — availability Quebec |
Hyperbaric oxygen therapy (HBOT) is a recognized adjuvant treatment in certain forms of gangrene - it never replaces surgery but can improve outcomes in validated indications; mechanism of action of HBOT in gangrene: tissue hyperoxygenation: inspiration of 100 % O₂ at 2-3 ATA → plasma pO₂ increased by 10-13× → diffusion of O₂ in hypoxic tissues → effects: direct bacteriostatic on strict anaerobes (O₂ inhibits anaerobic enzymes + promotes the formation of free radicals toxic to anaerobes) + inhibition of alpha-toxin production (Clostridium) at pO₂ >250 mmHg + stimulation of neoangiogenesis + activation of fibroblasts + restoration of neutrophil chemotaxis (impaired in hypoxia) + sharper demarcation between necrotic tissue and healthy → potentially reducing the extent of amputations + paradoxical vasoconstriction → reducing edema (without reducing oxygenation as physical dissolution of O₂ compensates for vasoconstriction) ; validated indications for HBOT in gangrene (Undersea and Hyperbaric Medical Society - UHMS 2022 + Société de médecine hyperbare - SMH): gas gangrene (clostridial myonecrosis) → class I indication (evidence level B) + severe necrotizing fasciitis → indication discussed - positive retrospective cohort data but no randomized trial + severe ischemic or infected diabetic foot wound → class I indication (evidence level A - Liu 2013 meta-analysis: reduction in major amputation rate by 30 % at 5 years) + Fournier gangrene (perineal necrotizing fasciitis) → class II indication + refractory osteomyelitis → class I indication; standard HBOT protocol for gangrene: 100 % O₂ at 2.5-3.0 ATA + duration: 90-120 min per session + frequency: 2-3 sessions/d for the first 48-72 hours then 1-2 sessions/d → total number of sessions: 20-40 depending on indication | HBOT availability in Quebec and organization of care: HBOT centers in Quebec (non-exhaustive list - check current availability): CHU de Québec-Université Laval (Hôpital de l'Enfant-Jésus) + CISSS de Chaudière-Appalaches (certain sites) + private clinics (Montreal - South Shore) → RAMQ coverage of HBOT is limited to medically recognized indications (gas gangrene + refractory ischemic diabetic foot wound) → inter-hospital transfer organized by attending physician or surgical team → 24-hour access in tertiary centers for emergencies (gas gangrene) ; contraindications to HBOT : undrained pneumothorax (absolute CI) + severe claustrophobia + severe COPD with CO₂ retention (risk of central apnea) + acute otitis media or eustachian tube obstruction (barotrauma) + treatment with certain drugs (cisplatin + disulfiram + adriamycin - currently being administered) + pregnancy (relative CI - insufficient data - use in life-threatening emergencies); adverse effects of HBOT: atrial barotrauma (most frequent - prevention: Valsalva maneuver during compression) + CNS toxicity of O₂ (convulsions - risk <0.01 % per session) + pulmonary toxicity (repeated sessions - respiratory function monitoring) + transient cataract (prolonged sessions); adjuvant treatment of necrotizing infections - VAC therapy (negative pressure wound healing): polyurethane or polyvinyl foam + occlusive film + negative pressure pump (-50 to -125 mmHg) → continuous or intermittent suction → drainage of exudates + reduction of edema + stimulation of granulation → used as a bridge to thin skin grafting → reduces dressing changes + improves patient comfort → KCI ActiV.A.C. or V.A.C. VeraFlo system (with intermittent washing - saline solution + polyhexanide) → available in most Quebec hospitals |
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Necrotizing fasciitis and gas gangrene are absolute surgical emergencies—each hour lost increases mortality: In necrotizing soft tissue infections, the time between the onset of skin signs and initial surgical intervention is the primary determinant of survival. A delay of >24 hours is associated with a 2 to 3 times higher mortality rate compared to intervention within the first 12 hours. The earliest and most important clinical sign is pain disproportionate to the skin appearance – not visible necrosis, which is often a late sign. Any physician who suspects necrotizing fasciitis should immediately transfer the patient to a tertiary surgical center.
Situations Requiring Emergency Surgical Evaluation
Intense disproportionate pain + woody induration + tense edema + crepitus ± hemorrhagic bullae ± bronze or grayish skin + fever + tachycardia → necrotizing fasciitis or gas gangrene → absolute surgical emergency → call 911 + transfer to tertiary surgical center → radical surgical debridement within 6 hours → immediate IV antibiotic therapy.
Deep traumatic wound contaminated with soil + progressive severe pain + crepitus + bronze skin in 6–24h → Clostridium gas gangrene → life-threatening emergency → emergency amputation or disarticulation + IV penicillin G + IV clindamycin + HBO as soon as possible without delaying surgery.
Pain + scrotal or vulvar edema + progressive perineal erythema ± crepitus ± fever in a diabetic or immunocompromised patient, or on an SGLT2 inhibitor → Fournier's gangrene → surgical emergency → radical perineal debridement + IV antibiotics + blood glucose monitoring + surgical consultation (possible diversion colostomy).
Diabetic foot with black necrotic toe or forefoot + pus + fever + blood glucose >15 mmol/L + pain or indolence Severe diabetic foot gangrene → hospitalization + vascular assessment (Doppler ultrasound + angio-CT scan) + infectious disease specialist + vascular surgeon + debridement ± partial amputation ± revascularization according to WIFI score.
Consult at Clinique Omicron
Clinique Omicron doctors provide screening for gangrene risk factors—diabetes, occlusive arteriopathy, smoking, immunosuppression—and participate in the preventive management of diabetic foot (annual examination, screening for neuropathy and PAD, Level 1 wound care). Any suspicion of gangrene or necrotic infection is immediately referred to the appropriate hospital emergency department. For a consultation at one of our service locations in Quebec, visit cliniqueomicron.ca.
The content of this page is for informational purposes only and does not replace the advice of a surgeon, infectious disease specialist, or emergency physician. Gangrene is a medical and surgical emergency where the prognosis depends on the speed of intervention—any suggestive sign should lead to an immediate emergency room visit.
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