Burn Wound Sepsis -

Burn Wound Sepsis

Little attention has been focused on the local burn wound environment, even though burn wound sepsis is a common cause of death in the burn victim. To characterize the effect of the local burn wound environment on neutrophil function and metabolism, the opsonic activity of blister fluid specimens against Pseudomonas aeruginosa was measured as was the effect of blister fluid on control neutrophil oxygen consumption using preopsonized zymosan and f-met-leu-phe (FMLP) as stimuli. Blister fluid did not support the killing of P. aeruginosa by normal neutrophils as well as normal serum. Additionally, blister fluid inhibited zymosan-stimulated, but not FMLP-stimulated, neutrophil oxygen consumption. The inhibitory effect of blister fluid on zymosan-stimulated oxygen consumption correlated with the extent of complement activation, measured as C3d or C3AI (p less than 0.01). That blister fluid did not inhibit the FMLP-mediated respiratory burst supports the concept that the blister fluid inhibitory effect on the zymosan-mediated respiratory burst was mediated through the complement receptor. These findings that blister fluid can affect the bactericidal and metabolic activity of normal neutrophils support the concept that cellular function can be altered by the microenvironment in which the cells are bathed. This potential impairment of host defenses within the burn wound could predispose the burn victim to burn wound sepsis.

Background: Infection remains the leading cause of death among patients who are hospitalized for burns. The risk of burn wound infection is directly correlated to the extent of the burn and is related to impaired resistance resulting from disruption of the skin's mechanical integrity and generalized immune suppression.

Burn wounds may be classified as wound cellulitis, which involves the unburned skin at the margin of the burn, or as an invasive wound infection, which is characterized by microbial invasion of viable tissue beneath the burn wound eschar. Bacterial burn wound infections and mortality from burn wound sepsis decrease with rapid burn debridement and wound closure and the use of effective topical and systemic antimicrobial chemotherapies. Unfortunately, the number of invasive fungal burn wound infections has risen significantly, likely because of excessive antimicrobial use. Overall mortality rates from burn wound sepsis remain high.

Management of severe burn wounds is aimed at preventing the progression of injury by maintaining adequate tissue oxygenation through aggressive volume repletion and early removal of necrotic tissue followed by wound closure. Effective topical antimicrobial therapy and daily wound inspection are necessary to monitor for infection, which may cause conversion of partial-thickness burns to full-thickness injuries.

Pathophysiology: Burn injury causes mechanical disruption to the skin, which allows environmental microbes to invade the deeper tissues. The usual skin barrier to microbes is replaced by a moist, protein-rich, avascular eschar that fosters microbial growth. The avascularity of the eschar prevents migration of immune cells and restricts the distribution of systemically administered antibiotics. Furthermore, toxic intermediaries released by the eschar can impede the immune response.

The burn wound surface is sterile immediately following injury; however, it is repopulated quickly with gram-positive organisms from hair follicles, skin appendages, and the environment during the first 48 hours. More virulent gram-negative organisms replace the gram-positive organisms after 5-7 days. Gram-negative organisms have greater motility, possess many antibiotic resistance mechanisms, and have the ability to secrete collagenases, proteases, lipases, and elastases, enabling them to proliferate and penetrate into the subeschar space. If host defenses are inadequate, invasion of viable tissue occurs.

Thermal injury has a severe impact on the host's cellular and humoral immune systems. The degree of immune suppression is proportional to the duration and temperature of thermal exposure. The injury produces a loss of skin and subjacent tissue, resulting in an area of irreversible central coagulation necrosis surrounded by an area of pronounced inflammation and hyperemia. The presence of major thermal injury impairs all circulating and stationary phagocytic cells, as well as bactericidal activity. Reduction of T-cell activity, decreases in inflammatory cytokine levels, and decreases in complement levels result in global impairment of host defenses.

Although advances in local burn therapies, including the judicious use of antimicrobials, undoubtedly has reduced infectious complications from large burns, secondary opportunistic infections with fungal pathogens have been noted in recent years. This especially is prevalent in patients sustaining larger burns (>40% total body surface area [TBSA]) who receive multiple doses of broad-spectrum perioperative antibiotics during wound debridement and/or antibiotics for infections at other sites.

Frequency:

  • In the US: Burn wound infections are rare in partial-thickness wounds. The risk of invasive burn wound infection is directly related to the extent of the burn. Burn wound infections account for 3-7% of all infections in patients with burns and occur most frequently in children, followed by elderly patients.
  • Internationally: Burn wound infections occur more frequently in countries with overcrowded burn units, fewer infection control barriers, and less access to immediate wound debridement or antimicrobial therapies.

Mortality/Morbidity: Burn wound cellulitis usually is responsive to topical and systemic antibiotic therapy and rarely is associated with progression or death. Invasive burn wound infections occur most often in critically injured patients with severe burns. Invasive burn wound infections with extension of tissue injury and multisystem organ dysfunction are associated with a mortality rate as high as 75%.

Age: Burn wound infections occur most frequently in children, followed by elderly patients.


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History: Burn wound infections are rare in partial-thickness burns unless they have been neglected or managed improperly. Invasive wound infections typically occur in patients with full-thickness burns involving more than 30% of their body. Risk of wound infection is increased in wounds that remain open because of a failure of the primary closure modality or because of comorbidities.

  • Burn wound cellulitis is characterized by worsening localized pain and erythema in the skin surrounding the burn.
  • Invasive infection occurs in patients with a significant full-thickness burn in which closure is delayed.

Physical:

  • Burn wound cellulitis
    • Inflammatory changes in the skin adjacent to the burn are typical of burn wounds. However, areas that have progressive erythema or become more painful indicate cellulitis.
    • Cellulitis may not be associated with fever, tachycardia, or leukocytosis.
  • Invasive infection
    • Gauging burn wound sepsis by clinical signs and symptoms is difficult.
    • Patients with extensive burn wounds generally manifest physiologic changes associated with hypermetabolism, including tachycardia, hypothermia or hyperthermia, tachypnea, ileus, glucose intolerance, and mental status changes.
    • The clinical diagnosis of an invasive burn wound infection is best made by careful serial evaluations of the wound.
  • Clinical signs suggestive of burn wound infection include the following:
    • Progression of partial-thickness to full-thickness injury
    • Change in wound color (focal areas of red, brown, or black discoloration)
    • Green discoloration of the subcutaneous fat
    • Violaceous discoloration and edema of wound margins
    • Subeschar hemorrhage
    • Rapid eschar separation

Causes:

  • Risk factors for the development of a burn wound infection
    • Burn covering more than 30% TBSA
    • Full-thickness burn
    • Extremes in patient age
    • Preexisting disease (eg, immune suppression, diabetes, vascular insufficiency)
    • Virulence and antibiotic resistance of colonizing organism
    • Failed skin graft
    • Prolonged open burn wounds
    • Improper initial burn wound care
  • Organisms most frequently isolated from burn wound biopsy specimens
    • Staphylococcus aureus
    • Pseudomonas aeruginosa
    • Enterobacter cloacae
    • Klebsiella pneumoniae
    • Enterococcus faecalis
    • Acinetobacter baumannii
    • Aspergillus species
    • Candida albicans
  • Organisms most frequently causing burn wound infection
    • Aspergillus species
    • Mucor species
    • Enterobacter cloacae
    • Aeromonas hydrophila
    • Enterococcus faecalis
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Lab Studies:

Other Tests:

Procedures:

Histologic Findings: Microorganisms are present in viable unburned tissue. Aspergillus hyphae are 2-4 mm wide with frequent septa and a characteristic 45° branching pattern. Vascular microbial invasion and small vessel thrombosis are observed. Ischemic necrosis of unburned tissue and hemorrhage in unburned tissue is observed.

Staging:

 

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Medical Care:

Surgical Care:

Consultations: An ophthalmologic evaluation should be performed in patients with suspected or proven candidemia to exclude the possibility of metastatic Candida endophthalmitis.

Diet: The basal metabolic rate is increased 100% above the reference range in patients with burns of greater than 40% TBSA.

Activity: Patients may be as active as they can tolerate. Aggressive physical therapy of extremity injuries is paramount.

The goals of pharmacotherapy are to eradicate the infection, reduce morbidity, and prevent complications.

Drug Category: Antibiotics -- Applied after injury to limit bacterial colonization. Established infection requires use of topical agents that can penetrate the eschar to reduce microbial counts and prevent systemic dissemination.

Systemic agents are instituted for cellulitic wound infections, gram-positive suppurative infections, extensive fungal invasion, or systemic spread.

Drug Name
Silver nitrate -- Silver ion has broad-spectrum antibacterial activity but does not penetrate burn wound eschar; therefore, it is most effective when applied early.
Adult Dose Apply topically to wound to a thickness of approximately 1.5 mm qd or bid as moistened dressings
Pediatric Dose Administer as in adults
Contraindications Documented hypersensitivity; broken skin or cuts
Interactions Decreases effects of sulfacetamide preparations
Pregnancy C - Safety for use during pregnancy has not been established.
Precautions Not for internal use; can cause sodium, potassium, chloride, and calcium leaching from wound
Drug Name
Mafenide (Sulfamylon) -- Topical sulfonamide. Diffuses freely into the eschar and is highly effective against gram-negative organisms, including Pseudomonas species.
Adult Dose Apply cream to open wounds bid/tid
Pediatric Dose Apply as in adults
Contraindications Documented hypersensitivity; renal impairment
Interactions None reported
Pregnancy C - Safety for use during pregnancy has not been established.
Precautions Pain or burning may occur upon application; metabolized to a carbonic anhydrase inhibitor (p- carboxybenzenesulfonamide), which may result in metabolic acidosis
Drug Name
Mupirocin (Bactroban) -- Active against a wide variety of gram-positive bacteria, including methicillin-resistant Staphylococcus aureus. Also active against certain gram-negative bacteria. Exerts activity by binding to bacterial isoleucyl transfer RNA-synthetase.
Adult Dose Apply to affected areas tid and cover with gauze dressing
Pediatric Dose Apply as in adults
Contraindications Documented hypersensitivity
Interactions None reported
Pregnancy B - Usually safe but benefits must outweigh the risks.
Precautions Prolonged use may result in growth of nonsusceptible organisms; do not use on very large wounds where polyethylene glycol absorption is possible (especially in patients with moderate renal failure)
Drug Name
Silver sulfadiazine (Silvadene) -- Useful in prevention of infections from second- or third-degree burns. Has bactericidal activity against many gram-positive and gram-negative bacteria, including yeast.
Adult Dose Apply to open wounds bid/tid
Pediatric Dose <3 months: Not recommended
>3 months: Apply as in adults
Contraindications Documented hypersensitivity; women who are pregnant or breastfeeding (possibility of kernicterus in infant)
Interactions Effect of proteolytic enzymes (eg, collagenase, papain, sutilains) is reduced when used concomitantly
Pregnancy C - Safety for use during pregnancy has not been established.
Precautions Caution in patients with G-6-PD deficiency and renal insufficiency; may induce neutropenia as a result of direct bone marrow suppression
Drug Name
Penicillin G (Pfizerpen) -- Inhibits biosynthesis of cell wall mucopeptide. Bactericidal against sensitive organisms when adequate concentrations are reached and most effective during the stage of active multiplication. Inadequate concentrations produce only bacteriostatic effects.
Adult Dose 12-18 million U/d IV divided q4h
Pediatric Dose 25,000-50,000 U/kg/d IV divided q6h
Contraindications Documented hypersensitivity
Interactions Probenecid may increase serum levels by decreasing clearance; tetracyclines are bacteriostatic, causing a decrease in the effectiveness of penicillins when administered concurrently
Pregnancy B - Usually safe but benefits must outweigh the risks.
Precautions Caution in patients with renal impairment
Drug Category: Antifungals -- Mechanism of action usually involves inhibiting pathways (enzymes, substrates, transport) necessary for sterol/cell membrane synthesis or altering the permeability of the cell membrane (polyenes) of the fungal cell.
Drug Name
Amphotericin B (Amphocin, Fungizone) -- Useful for many serious systemic fungal infections. Produced by a strain of Streptomyces nodosus. Can be fungistatic or fungicidal. Binds to sterols (eg, ergosterol) in fungal cell membrane, causing intracellular components to leak, with subsequent fungal cell death.
Adult Dose 0.5-1 mg/kg/d IV (range is 0.25-1.5 mg/kg/d); not to exceed 1.5 mg/kg/d
Pediatric Dose 0.25 mg/kg IV over 6 h with frequent observation during the first several hours of the infusion; if no reaction with initial dose, a full maintenance dose may be administered
Maintenance: 0.5 mg/kg IV (range is 0.25-1 mg/kg/d)
Contraindications Documented hypersensitivity; hypokalemia and/or hypomagnesemia
Interactions Concurrent use with loop diuretics (eg, furosemide, bumetanide, ethacrynic acid), corticosteroids or corticotropin, ACTH, cisplatin, or carbonic anhydrase inhibitors can cause additive hypokalemia due to renal potassium wasting; hypokalemia can potentiate cardiac toxicity of cardiac glycosides (eg, digoxin) and dofetilide; hypokalemia can enhance curariform effect of neuromuscular blockers (eg, tubocurarine)
Pregnancy B - Usually safe but benefits must outweigh the risks.
Precautions Monitor renal function, serum electrolytes (eg, magnesium, potassium), liver function, CBCs, and hemoglobin concentrations; resume therapy at lowest level (eg, 0.25 mg/kg) when interrupted for more than 7 d; hypoxemia, acute dyspnea, and interstitial infiltrates may occur in patients with neutropenia who are receiving leukocyte transfusions (separate time of amphotericin infusion from time of leukocyte transfusion)
Drug Name
Ciclopirox (Loprox) -- Interferes with synthesis of DNA, RNA, and protein by inhibiting the transport of essential elements in fungal cells.
Adult Dose Apply to affected area bid
Pediatric Dose Not established
Contraindications Documented hypersensitivity
Interactions None reported
Pregnancy B - Usually safe but benefits must outweigh the risks.
Precautions Avoid contact with eyes and other internal routes
Drug Name
Clotrimazole (Lotrimin) -- Broad-spectrum antifungal agent that inhibits yeast growth by altering cell membrane permeability, causing death of fungal cells.
Adult Dose Apply to affected area bid
Pediatric Dose Not established
Contraindications Documented hypersensitivity
Interactions None reported
Pregnancy B - Usually safe but benefits must outweigh the risks.
Precautions Not for treatment of systemic fungal infections; avoid contact with eyes; if irritation or sensitivity develops, discontinue use and institute appropriate therapy
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Deterrence/Prevention:

Complications:

Prognosis:


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