Clinical presentation and local changes
Suspecting the onset of gas gangrene is enabled by the classical triad of signs: severe wound pain, high body temperature, and rapidly developing edema (increase in limb volume). These symptoms serve as an absolute indication for immediate exploration of the wound tract.
When gangrene develops, the local picture in the wound is quite specific:
- Muscles: bulge from the wound, first acquire a waxy hue, and then become similar to "cooked meat".
- Tissues: are covered with a dirty-gray coating, granulations are completely absent.
- Gas production: gas bubbles are released when pressing on the wound edges.
- Discharge: scanty, gelatinous, color ranges from light yellow to dirty brown.
If a putrid infection joins the process, the characteristic odor of decomposing tissues appears. A prognostically unfavorable sign is tissue dryness and a decrease in the amount of exudate. Conversely, an increase in the volume of serous discharge indicates that the process is subsiding.
Diagnostics
Early diagnosis is critically important to save the patient's life.
- Clinical tests: the presence of the "razor sign" reliably confirms the diagnosis.
- Radiological method: necessary to detect gas accumulations in deep muscle layers (when crepitus cannot yet be determined by palpation) and to monitor the increase in gas production.
- Emergency laboratory diagnostics: bacterioscopy of smash smears with Gram staining allows for the rapid detection of large Gram-positive rods.
- Bacteriological culture: is not used for urgent diagnosis due to the slow growth of anaerobes. Its results are used later to adjust specific therapy.
Surgical treatment
Patients with gas gangrene are subject to mandatory isolation in box wards or separate rooms. Treatment begins on an emergency basis.
Emergency surgery includes wide incision of the wound and fascial compartments, complete removal of necrotic tissues (primarily affected muscles). When an entire limb segment is involved, relieving incisions are performed — deep longitudinal incisions of the skin, subcutaneous tissue, and fascia (5–6 incisions are made on the thigh, 3–4 on the lower leg). The wound is managed openly using loose packing with gauze moistened with hydrogen peroxide. The use of circular plaster casts is strictly forbidden.
Amputation (exarticulation) is performed by the guillotine method — without applying a tourniquet and without suturing the stump. It is indicated for total limb involvement, injury to major vessels, extensive bone destruction, or the failure of previous surgeries.
Comprehensive conservative therapy
Conservative treatment is carried out in parallel with surgical intervention and includes several areas:
- Specific serotherapy: begins right on the operating table. 150,000 IU of polyvalent anti-gangrene serum (50,000 IU against each of the three main clostridia) are administered intravenously via drip (in 300–400 ml of saline). Simultaneously, another 5 prophylactic doses are administered intramuscularly. A sensitivity test is mandatory before administration.
- Detoxification and infusion: the fluid volume reaches up to 4 liters per day. Polyionic solutions, dextrans (to improve microcirculatory flow), and protein blood substitutes are used.
- Drug therapy: antibiotics (vancomycin, carbapenems), antimicrobial agents (metronidazole), and chemical antiseptics (hydroxymethylquinoxylindioxide).
- HBO: hyperbaric oxygenation at a pressure of 2.5–3 atm is a vital component that reduces the risk of early amputations, although it does not replace surgical intervention.
Prevention
The basis of nonspecific prevention is early primary surgical debridement (PSD) with complete excision of necrotic areas and thorough immobilization. An important rule: for crushed and gunshot wounds, sutures are not applied.
Specific prevention is indicated for extensive injuries and severe contamination. Polyvalent anti-gangrene serum is used at an average dose of 30,000 IU (10,000 IU each against Cl. perfringens, Cl. oedematiens, Cl. septicum).
The emergency exploration triad for gas gangrene is the "BTO" rule: Pain in the wound, Temperature (high), Edema (rapidly developing).
Class and exam questions
Why are the results of bacteriological culture not awaited when gas gangrene is suspected?
Anaerobic bacteria require a long time for cultivation. The necrosis process in clostridial infection progresses fulminantly, so the diagnosis is made clinically, and culture is used only for subsequent treatment adjustment.
What does the appearance of thick purulent discharge in the wound mean during an anaerobic infection?
The appearance of thick pus, as well as hyperemia and swelling of the wound edges, indicates the addition of secondary severe purulent microflora.
How to properly perform an amputation in gas gangrene?
Amputation is performed by the guillotine method: it is forbidden to apply a hemostatic tourniquet and to suture the stump. In severe cases, the fascial compartments of the stump are additionally widely opened.
What else to study on this topic
- Technique for performing relieving incisions on various limb segments
- Rules for conducting a sensitivity test to anti-gangrene serum
- Features of limb immobilization (skeletal traction, plaster splints) in anaerobic infection
- Protocols for the use of hyperbaric oxygenation (HBO) in purulent surgery
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