Advantages of immediate excision of burn eschar

Debridement efficacy of serine protease and formulated cream by In Vitro assessment against artificial wound eschar

Chronic wounds typically comprise of necrotic tissue and dried secretions, often culminating in the formation of a thick and tough layer of dead skin known as eschar. Removal of eschar is imperative to facilitate wound healing. Conventional approach for eschar removal involves surgical excision and grafting, which can be traumatic and frequently leads to viable tissue damage. There has been growing interest in the use of enzymatic agents for a gentler approach to debridement, utilizing proteolytic enzymes. In this study, a purified intracellular recombinant serine protease from Bacillus sp. (SPB) and its cream formulation were employed to evaluate their ability to degrade artificial wound eschar; composed of collagen, fibrin, and elastin. Degradation was assessed based on percentage weight reduction of eschar biomass, analysis via sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE), and scanning electron microscopy (SEM). Both SPB and its cream formulation were able to degrade up to 50 % artificial wound eschar, with the SPB cream maintaining its degradation efficiency for up to 24 hours. Additionally, the SPB-based cream demonstrated the ability to hydrolyze proteinaceous components of eschars individually (fibrin and collagen) as determined through qualitative assessment. These findings suggest that SPB holds promise for the debridement of wound eschar.

Comparison of outcome of early tangential excision with autografting versus interactive antimicrobial dressing in deep-partial thickness burn patients: A retrospective analysis

BACKGROUND

The relative effectiveness of early excision and autografting (EG) for deep-partial thickness burns needs to be updated through comparison to initial non-operative (INO) treatment using modern interactive antimicrobial (IA) dressings in a South-Asian burn patient population.

OBJECTIVE

To compare the outcome of early tangential excision and autografting (EG) to initial non-operative (INO) treatment using interactive antimicrobial dressing.

METHODS

Records of 106 adult burn survivors with predominantly deep-partial thickness thermal burns of TBSA ≤ 30 % were retrospectively reviewed (53 patients each in EG-arm and INO-arm). EG-arm patients underwent excision and autografting within 7 days. INO-arm patients, who had opted against surgical excision, received interactive antimicrobial dressing (hydrofiber with ionic silver). Outcomes measured include percentage of wound healed on days 14 and 21, days to complete wound healing, duration of hospital stay, complications (on 12 months' follow-up) and patient satisfaction scores. Patients were analyzed as treated.

RESULT

Patients in each arm had similar TBSA and demographic profiles. In EG-arm patients, 15-20 % of TBSA were grafted on 5.02 ± 0.71 post-burn day. Thirty percent of EG-arm patients required a second session of grafting for the remaining burn wound, which occurred on 6.873 ± 0.34 post-burn day. On the 21st post-burn day the EG-arm, compared to the INO-arm, had a higher percentage of wound epithelization (98.60 ± 4.03, versus 76.16 ± 7.02, P < 0.01), less days to complete healing (17.60 ± 5.83, versus 40.16 ± 9.09, P < 0.01), and shorter hospital stays (19.62 ± 6.85 days, versus 35.56 ± 7.77 days, P < 0.01). Twenty-five (47 %) INO-arm patients underwent delayed grafting on post-burn day 25.42 ± 0.49. The INO-arm suffered significantly more complications, such as hypertrophic scar, dyspigmentation and functional disability (P < 0.05). EG-arm patients were more satisfied than INO-arm patients (P < 0.01).

CONCLUSION

We report superior outcomes in the early tangential excision and autografting-arm as compared to the initial non-operative treatment arm. The dogma of early excision and autografting remains valid despite significant advances in wound dressing materials.

Barriers and prospects for skin grafting in burn treatment across African countries

INTRODUCTION

The current standard management of full-thickness or deep dermal burns is early tangential excision and skin grafting. A conservative approach to deep burns without the option of skin grafting results in delayed wound healing, possibly leading to wound infection and is associated with hypertrophic scarring and increased morbidity and mortality. The aim of this study was to improve the understanding of the management and availability to perform skin grafting for burns on the African continent. It also sought to identify challenges and perceived improvements.

METHODS

A web-based, structured, closed-formatted, multinational survey was designed to gather information on the current state and availability of skin grafting of burn wounds on the African continent. The questionnaire consisted of 27 questions, available in English and French. It was reviewed within the GAP-Burn collaboration network and sent to 271 health care professionals who had participated in a previous study and had initially been recruited by means of the snowball system.

RESULTS

The questionnaire was completed 84 times (response rate: 31.0%), of which 3 were excluded. Responses originated from 22 African countries. The majority 71 (87.7%) resulted from countries with a low Human Development Index (HDI), 7 (8.6%) from medium HDI countries. Split thickness skin grafting (STSG) is performed in 51 (63.0%) centers. The majority considers STSG to reduce length of stay (72.8%) and improve scarring (54.3%), yet some indicated that STSG is associated with increased risk of donor site infection (8.6%) and severe bleeding (7.4%). Factors preventing increased grafting included lack of equipment and training.

CONCLUSION

Skin grafting is not performed in a significant number of hospitals treating burns. The majority of the staff believe that more skin grafting would lead to a better outcome. Advocacy and improved infrastructure, human resources coupled with introduction to well-structured health coverage for all in African countries could help to better access and affordability in burn care.

Early wound excision within three days decreases risks of wound infection and death in burned patients

INTRODUCTION

In lieu of limited studies on the timing of burn wound eschar excision for burns, a more comprehensive analysis is indicated to determine the effects of early wound excision following burns. This study aims to address the outcomes of early wound excision in burn patients.

METHODS

Data collection were from TriNetX research database. Three groups of burn patients were stratified by the number of days in which they received burn wound excision within 14 days of injury. Five outcomes were observed: death, wound infection, sepsis, myocardial contractile dysfunction, and blood transfusion. Risk and incidence of various health outcomes were compared between the groups after propensity-matching age, sex, ethnicity, race and burn size using a z-test with p < 0.05 considered significant.

RESULTS

We identified 6158 burn patients with wound excision within 14 days of injury, the majority of whom (60.1%) received burn wound excision between 0 and 3 days after burn. 72.5% of patients had burns covering less than 20% of total body surface area. After propensity matching, we found a significantly lower risk of mortality in those who received burn wound excision within the first three days (3.84%) as compared to 8-14 days after burn (6.09%) (p < 0.05). Moreover, we found a decreased risk of wound infection in patients with burn wound excision within 0-3 days (37.84%) compared to those 4-7 days (42.48%) (p < 0.05). No statistical difference was detected in propensity-matched groups for myocardial contractile dysfunction, blood transfusion, or sepsis. In addition, the risk of hypertrophic scaring significantly decreased when wound excision was performed within 0-3 days (22% within 0-3 days, 28% within 4-7 days, p < 0.05).

CONCLUSION

Burn wound excision within 3 days of injury is beneficial when comparing to later treatment between 4 and 14 days, which results in a significantly lowered risk of mortality and infection in burn patient.

Ventilation practices in burn patients—an international prospective observational cohort study

Background

It is unknown whether lung-protective ventilation is applied in burn patients and whether they benefit from it. This study aimed to determine ventilation practices in burn intensive care units (ICUs) and investigate the association between lung-protective ventilation and the number of ventilator-free days and alive at day 28 (VFD-28).

Methods

This is an international prospective observational cohort study including adult burn patients requiring mechanical ventilation. Low tidal volume (VT) was defined as VT ≤ 8 mL/kg predicted body weight (PBW). Levels of positive end-expiratory pressure (PEEP) and maximum airway pressures were collected. The association between VT and VFD-28 was analyzed using a competing risk model. Ventilation settings were presented for all patients, focusing on the first day of ventilation. We also compared ventilation settings between patients with and without inhalation trauma.

Results

A total of 160 patients from 28 ICUs in 16 countries were included. Low VT was used in 74% of patients, median VT size was 7.3 [interquartile range (IQR) 6.2–8.3] mL/kg PBW and did not differ between patients with and without inhalation trauma (p = 0.58). Median VFD-28 was 17 (IQR 0–26), without a difference between ventilation with low or high VT (p = 0.98). All patients were ventilated with PEEP levels ≥5 cmH2O; 80% of patients had maximum airway pressures &lt;30 cmH2O.

Conclusion

In this international cohort study we found that lung-protective ventilation is used in the majority of burn patients, irrespective of the presence of inhalation trauma. Use of low VT was not associated with a reduction in VFD-28.

Trial registration

Clinicaltrials.gov NCT02312869. Date of registration: 9 December 2014.