Soft tissue wound complications

Classification of complications and risk factors

Complications of soft tissue injuries are divided into two main groups:

• Local complications: associated with the development of an infectious process directly in the injury zone. Extensive wounds create a wide portal of entry for pathogenic microflora. Blood accumulations (hematomas) and areas of necrotic or marginally viable tissues under conditions of impaired microcirculation serve as an ideal environment for bacterial proliferation.
• Systemic complications: include generalization of wound infection (sepsis) and the development of pneumonia.

The course of the wound process is influenced by a number of factors. The leading one is the general condition of the wounded person, which deteriorates significantly with major blood loss, dehydration, neuro-psychological exhaustion, and functional disorders (e.g., swallowing and chewing disorders). Topographic and anatomical features play an important role: injuries in the submandibular region and lateral parts of the face are more severe, and granulation forms more slowly there compared to other zones.

Clinical presentation of severe infection

When a wound is infected, inflammatory tissue infiltration rapidly increases and pronounced edema appears. Of particular danger is gas (anaerobic) infection, which has specific clinical differences from common pyogenic (aerobic) flora:

• Edema: is significantly more extensive.
• Pain syndrome: sharp tenderness is noted upon palpation of soft tissues.
• Skin changes: the skin is severely taut (shiny skin). At the same time, skin color most changes rarely, with only occasional separate, non-confluent dark red spots appearing.

Healing dynamics and the "critical period"

The first 5–7 days after injury are considered the "critical period". It is during this time, under the influence of local and systemic factors, that a favorable course of the wound process may turn into an unfavorable one.

Normally, granulation tissue appears in the wound on the 4th–5th day, and by the 5th–6th day, a clear demarcation line is formed—a macroscopic boundary separating viable tissues from dead (necrotic) ones. The transition from the acute to the subacute phase occurs on the 10th–12th day. The recovery period begins on the 15th–20th day in moderate injuries and drags on up to 25th–30th day in severe destruction.

Note: Late-initiated or inadequate treatment prolongs the duration of all phases. In addition, the presence of bone fragments or foreign bodies in the wound leads to chronicity of the process with periodic exacerbations.

Pre-hospital prophylaxis

Full prophylaxis of infectious complications is primary surgical debridement (PSD), but other measures are applied before admission to the hospital:

1. Aseptic dressings: applied to protect the wound from additional microbial contamination during transport. An important rule is to avoid unnecessary dressing changes; the dressing should be adjusted and re-bandaged only in cases of absolute necessity.
2. Antibacterial therapy: early prophylactic administration of broad-spectrum antibiotics should begin in the first hours after trauma. If delivery to the hospital is delayed, drugs are administered at the pre-hospital stage.
3. Specific prophylaxis: tetanus and anaerobic infection prophylaxis is mandatory according to established protocols.

Antibiotic therapy for severe complications and hospitalization

For the treatment of severe complicated skin and soft tissue infections (e.g., necrotizing fasciitis), as well as bacterial sepsis, reserve drugs—carbapenems—are used. They are effective against multi-resistant and mixed (aerobic-anaerobic) flora. For infections caused by gram-negative aerobes (including P. aeruginosa), monobactams (aztreonam) are used as an alternative to aminoglycosides in case of their intolerance.

Patients with extensive and deep soft tissue wounds, open fractures, and major joint injuries have absolute indications for hospitalization in a specialized hospital for diagnosis clarification and emergency surgical care.

Class and exam questions

What else to study on this topic

• Mechanism of action and activity spectrum of carbapenems in severe wound infections.
• Use of monobactams (aztreonam) as an alternative to aminoglycosides.
• Criteria for discharging trauma victims to outpatient treatment.
• Features of the wound healing process in gunshot facial injuries.
• Timing of fracture consolidation and demarcation line formation.

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Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.