SPaCE Swab: Point-of-Care Sensor for Simple and Rapid Detection of Acute Wound Infection.

Wound infection is commonly observed after surgery and trauma but is difficult to diagnose and poorly defined in terms of objective clinical parameters. The assumption that bacteria in a wound correlate with infection is false; all wounds contain microorganisms, but not all wounds are clinically infected. This makes it difficult for clinicians to determine true wound infection, especially in wounds with pathogenic biofilms. If an infection is not properly treated, pathogenic virulence factors, such as rhamnolipids from Pseudomonas aeruginosa, can modulate the host immune response and cause tissue breakdown. Life-threatening sepsis can result if the organisms penetrate deep into host tissue. This communication describes the sensor development for five important clinical microbial pathogens commonly found in wounds: Staphylococcus aureus, P. aeruginosa, Candida albicans/auris, and Enterococcus faecalis (the SPaCE pathogens). The sensor contains liposomes encapsulating a self-quenched fluorescent dye. Toxins, expressed by SPaCE infecting pathogens in early-stage infected wounds, break down the liposomes, triggering dye release, thus changing the sensor color from yellow to green, an indication of infection. Five clinical species of bacteria and fungi, up to 20 strains each (totaling 83), were grown as early-stage biofilms in ex vivo porcine burn wounds. The biofilms were then swabbed, and the swab placed in the liposome suspension. The population density of selected pathogens in a porcine wound biofilm was quantified and correlated with colorimetric response. Over 88% of swabs switched the sensor on (107-108 CFU/swab). A pilot clinical study demonstrated a good correlation between sensor switch-on and early-stage wound infection.

Protocol for the development of a core indicator set for reporting burn wound infection in trials: ICon-B study.

INTRODUCTION: Systematic reviews of high-quality randomised controlled trials are necessary to identify effective interventions to impact burn wound infection (BWI) outcomes. Evidence synthesis requires that BWI is reported in a consistent manner. Cochrane reviews investigating interventions for burns report that the indicators used to diagnose BWI are variable or not described, indicating a need to standardise reporting. BWI is complex and diagnosed by clinician judgement, informed by patient-reported symptoms, clinical signs, serum markers of inflammation and bacteria in the wound. Indicators for reporting BWI should be important for diagnosis, frequently observed in patients with BWI and assessed as part of routine healthcare. A minimum (core) set of indicators of BWI, reported consistently, will facilitate evidence synthesis and support clinical decision-making. AIMS: The Infection Consensus in Burns study aims to identify a core indicator set for reporting the diagnosis of BWI in research studies. METHODS: (1) Evidence review: a systematic review of indicators used in trials and observational studies reporting BWI outcomes to identify a long list of candidate indicators; (2) refinement of the long list into a smaller set of survey questions with an expert steering group; (3) a two-round Delphi survey with 100 multidisciplinary expert stakeholders, to achieve consensus on a short list of indicators; (4) a consensus meeting with expert stakeholders to agree on the BWI core indicator set. ETHICS AND DISSEMINATION: Participants will be recruited through professional bodies, such that ethical approval from the National Health Service (NHS) Health Research Authority (HRA) is not needed. The core indicator set will be disseminated through peer-reviewed publication, co-production with journal editors, research funders and professional bodies, and presentation at national conferences. PROSPERO REGISTRATION NUMBER: CRD42018096647.

Resuscitation using less fluid has no negative impact on hydration status in children with moderate sized scalds: a prospective single-centre UK study.

BACKGROUND: After a burn, optimal fluid resuscitation is critical for positive patient outcome. Although national guidelines advocate using resuscitation fluids of 4mL per kg body weight and percent body surface area (%BSA) for paediatric burns of >10% BSA, evidence in adults suggest that such volumes lead to over-resuscitation and related complications. Our aim was to investigate whether children managed with biosynthetic dressings (Biobrane™) and reduced fluid volumes remain well hydrated, as determined by clinical and laboratory parameters. METHODS: At a single UK Burn Centre, children with scalds of 10-19%BSA managed with Biobrane were given 80% maintenance fluids and no formal burn resuscitation (permissive hypovolaemia [PH] group). Urine output (UO), serum sodium, urea, and creatinine were used as 24h markers of hydration and concentrations compared to those in a patient cohort treated within the same centre when traditional resuscitation was used (TR group). RESULTS: Serum sodium concentrations and UO in the PH group were similar to those in the TR group (median sodium: PH=136, TR=136, P=1.00; median UO: PH=1.5, TR=1.8, P=0.25). Urea concentrations were lower and creatinine concentrations higher in the TR group compared to the PH group (median urea: PH=3.2, TR=2.3, P=0.04; median creatinine: PH=21, TR=30, P<0.001). A higher proportion of TR patients than PH patients fell outside the reference ranges for urea (61% vs. 23%; P=0.04) and creatinine (44% vs. 8%; P=0.03). CONCLUSION: Based on markers of hydration, children with moderate-sized scalds managed with Biobrane can be safely managed with less fluid.

Variations in guideline use and practice relating to diagnosis and management of infection in paediatric burns services in England and Wales: A national survey.

BACKGROUND: Wound infection causes morbidity and mortality in burns. UK National Burns Care Standards state that guidance should be used to diagnose and treat burn wound infection. However, surveys of senior staff about standard operating procedures or guidance in UK burns services indicate that they are infrequently available (Papini et al., 1995; Lymperopoulos et al., 2015). Staff may have differing views and experiences of guidance use according to their role. This survey investigated the extent to which guidance is available, and current practices used for diagnosis and treatment of burn wound infection, both within and between paediatric burns services. METHODS: Staff from paediatric burns services in England and Wales were individually interviewed by two nurses about guidance and practices around antibiotic prophylaxis, diagnosis and management of burn wound infection and toxic shock syndrome, and antibiotic use. In each service staff from three categories were interviewed: lead consultant/burns specialist nurse, junior doctor/senior nurse, ward based nurse. Data were subjected to content analysis and reliably coded by two researchers using a coding frame. Guidance documents were also requested. RESULTS: Thirteen services took part. Staff in fewer than half of services reported that they had guidance for antibiotic prophylaxis, diagnosis, and management of burn wound infection. In nine services at least one staff member reported that they had guidance for antibiotic use. Guidance was available for diagnosis and management of toxic shock syndrome in ten services, and staff in five were consistently aware of it. One service routinely used antibiotic prophylaxis, but had no written guidance for it. In five services where at least one member of staff reported that they had guidance for diagnosing infection, at least one interviewed staff member was unaware of it. Swabbing practice varied between and within services, with 10 staff across six services cleaning before swabbing, and four staff in three services cleaning after swabbing. CONCLUSIONS: Staff from fewer than half of burns services report that they have guidance for diagnosing and managing burn wound infection, and there is variation between and within services relating to staff awareness of available guidance. There are some consistencies in practice; the majority of services do not use antibiotic prophylaxis, and there is consistent prescribing for suspected infection and tests used for infection diagnosis. Swabbing practices are less consistent. This survey indicates a need for evidence-based guidelines to be developed in order to meet national burns care standards, and for staff to be made aware of them and trained in their use. Guidelines do not need to replace clinical judgement and should be developed with the involvement of those who will implement them.

Lack of a standardised UK care pathway resulting in national variations in management and outcomes of paediatric small area scalds.

INTRODUCTION: There is a paucity of evidence guiding management of small area partial thickness paediatric scalds. This has prevented the development of national management guidelines for these injuries. This research aimed to investigate whether a lack of evidence for national guidelines has resulted in variations in both management and outcomes of paediatric small area scalds across England and Wales (E&W). METHODS: A national survey of initial management of paediatric scalds ≤5% Total Body Surface Area (%TBSA) was sent to 14 burns services in E&W. Skin graft rates of anonymised burns services over seven years were collected from the international Burns Injury Database (iBID). Average skin grafting rates across services were compared. Length of stay and proportion of patients receiving general anaesthesia for dressing application at each service were also compared. RESULTS: All 14 burns services responded to the survey. Only 50% of services had a protocol in place for the management of small area burns. All protocols varied in how partial thickness paediatrics scalds ≤5% TBSA should be managed. There was no consensus as to which scalds should be treated using biosynthetic dressings. Data from iBID for 11,917 patients showed that the average reported skin grafting rate across all burns services was 2.3% (95% CI 2.1, 2.6) but varied from 0.3% to 7.1% (P<0.001). Service provider remained associated with likelihood of skin grafting when variations in the %TBSA case mix seen by each service were controlled for (χ(2)=87.3, P<0.001). The use of general anaesthetics across services varied between 0.6 and 35.5% (P<0.001). The median length of stay across services varied from 1 to 3 days (P<0.001). DISCUSSION: A lack of evidence guiding management of small-area paediatric scalds has resulted in variation in management of these injuries across E&W. There is also significant variation in outcomes for these injuries. Further research is indicated to determine if care pathways and outcomes are linked. An evidence-based national policy for the management of small area paediatric scalds would ensure that high quality, standardised care is delivered throughout E&W and variations in outcome are reduced.