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Background Unpredictable outcomes with autologous fat grafting due to reabsorption processes present a major challenge for healthcare providers and patients. A higher number of viable adipocytes is considered to result in a higher volume being retained. Although various adverse factors have been extensively researched, other potential parameters have been less investigated or even neglected. Objective The aim of this study was to investigate the harvesting process of adipose tissue as the primary cause of cell damage and to determine the risk factors associated with low cell survival. Methods Thirty-nine male and female subjects undergoing planned elective liposuction or abdominoplasty were enrolled. Forty-seven lipoaspirates harvested by different liposuction techniques were analyzed. RNA isolation and real-time polymerase chain reaction was performed to elucidate differences in the expression of various adipocyte markers. Furthermore, scanning electron microscopy was performed on various samples to determine the cell damage caused by the different techniques. Results A statistically significant lower expression of peroxisome proliferator–activated receptor γ was detected in subjects with a higher BMI. A trend towards a lower expression of perilipin 1 in lipoaspirates harvested by a super wet + ultrasound technique, compared with dry and super wet techniques, was shown. The lowest level of cell damage determined from scanning electron microscopy images was in lipoaspirates harvested by the super wet + ultrasound technique, and this level was statistically significantly different from those obtained by the 2 other techniques. Conclusions Optimization of the outcome in autologous fat grafting may be feasible by targeting and optimizing the harvesting process as a main risk factor for impaired adipocyte viability. Ultrasound-assisted liposuction might be considered a suitable harvesting technique. Level of Evidence: 5

Background Autologous fat grafting is an effective tool for soft tissue augmentation in reconstructive breast surgery. Despite the major advantages of this minimally invasive approach, the unpredictability of graft survival presents challenges. Objectives No clear consensus on the optimal technique has yet been published and well-defined prospective studies investigating impairing factors are lacking. This aim of this study was to generate valuable fundamental data. Methods Ten female patients undergoing elective autologous fat grafting after nipple-sparing mastectomy were enrolled. Punch biopsies and lipoaspirates were collected from the harvest site for histologic, gene expression, and scanning electron microscopic analysis. Noninvasive Lipometer measurements determining the subcutaneous adipose tissue thickness at the graft site were used to calculate the respective take rate. Patient- and surgery-related data were acquired and correlated with the take rate. Results A statistically relevant correlation between the take rate and the existing mean subcutaneous adipose tissue thickness at the grafted breast prior to surgery was observed. An approximate correlation was identified regarding the number of previous grafting sessions, body weight, and BMI. No statistically significant correlation was demonstrated for age, harvest site, or the mean adipocyte size. A lower level of cell damage was observed in scanning electron microscopic samples of washed lipoaspirates; and a strong indirect correlation with the expression of the adipocyte markers FABP4 and PLIN1 was apparent. Conclusions Factors correlating to the take rate were identified. Future studies investigating the clinical relevance of each impairing factor are essential to contribute to the optimization of this valuable method. Level of Evidence: 4

Purpose Burn care is a highly relevant medical specialty in every part of the world. Different infrastructure, healthcare systems and access to medical supplies lead to different needs, treatment strategies and outcomes. A fundamental tool in a burn care provider’s armamentarium is the use of different dressings. Several studies have investigated the question of the ideal burn dressing, but none could achieve a proper global perspective. With advanced dressings being on the rise, we conducted this study to get a global understanding of the actual use and idea of the ideal burn dressing. Objective The objective of this study was to investigate the understanding of an ‘ideal burn dressing’ on a global scale. Materials and methods A questionnaire about burn care and the ideal burn dressing has been created and translated to five of the most spoken languages world-wide (English, Spanish, French, Chinese, Indonesian). It has been uploaded to an online survey platform and sent out to burn experts worldwide. The voluntary participation was possible for a period of four weeks. Results In total, 196 respondents from 49 countries participated in the study, yielding a response rate of 24.5%. The most important burn dressing characteristics in a cumulative ranking were (1) lack of adhesion (80.54%), (2) pain-free dressing change (79.87%), (3) requirement of fewer dressing changes, while in a linear ranking they were (1) anti-infective (35.14% 1st), pain-reduction (24.14% 2nd), and high absorbency (23.49% 3rd). Silver-based dressings are the most used dressings for superficial (45.21%) and deep (52.78%). 94.81% believe that the choice of burn dressing affects the outcome. Conclusion This investigation has delivered valuable insights into the global perspective of the ideal burn dressing. Yet, the question of the ideal burn dressing is still inconclusive. Wound dressing research is of fundamental interest for patients, healthcare providers and healthcare systems.

Increased ambient temperatures during the care of severely burned patients are essential for mitigating hypothermia and minimizing the impact of consecutive hypermetabolism. For involved medical staff, those conditions may lead to impaired concentration, possibly negatively affecting optimal patient care. Yet, alleviation strategies are lacking. As a novel coping strategy, cooling wear may be an effective means. This explorative study aimed to investigate the effect of high ambient temperatures on the concentration capacity and cooling wear to alleviate thermal stress. The effects of high ambient temperatures and the additional use of cooling wear on the concentration capacity of medical staff were investigated in six subjects during two simulated burn surgeries. Each individual served as his/her own control undergoing one simulation with and one without cooling wear. Concentration capacity was measured before and after each simulation with a standardized test. The results suggested that high ambient temperatures, as used in burn medicine, negatively affect human concentration capacity. The initial assessment of concentration capacity yielded homogenous values. After heat exposure, subjects wearing cooling wear showed a higher concentration capacity and a lower error rate compared to subjects without cooling wear. Summing up, temperature-related decrements in vigilance and performance among medical personnel may impair the patients’ outcome. As an opportunity to withstand thermal stress and improve medical care and safety, cooling wear showed promising results and may be used as a heat alleviator. Burn medicine may particularly benefit from further development and rigorous investigation of cooling strategies.

Acute infections of the hand can be a pathology with severe consequences. Alongside the surgical therapy, it is necessary to establish a systemic antiinfective therapy as well. The most frequent bacteria in acute hand infections are Staphylococcus aureus and, less frequently, different Streptococci. If the infection is the result of a bite wound, the most frequently found bacterium is Pasteurella multocida. Fortunately, the susceptibility to frequently used antibiotics in the (middle-)European area is quite good - according to the literature, resistances are rare. First line antibiotics are 1st and 2nd generation cephalosporins as well as aminopenicillins in combination with beta-lactamase inhibitors. Especially in multi-morbid patients or infections with unusual aetiology, a broader bacterial spectrum is to be expected. It is very effective to collect a tissue sample or swab for microbiological analysis before the establishment of the antiinfective therapy to gain valuable information about the prospective therapy. Ultimately, hand infections are a pathology to be treated with increased attention to avoid severe complications. A close cooperation with the involved specialties and physiotherapists should be sought to guarantee the best possible outcome.

Resveratrol is a well‐known antioxidant that harbours many health beneficial properties. Multiple studies associated the antioxidant, anti‐inflammatory, and cell protective effects of resveratrol. These diverse effects of resveratrol are also potentially involved in cutaneous wound healing, scarring, and (photo‐)aging of the skin. Hence, this review highlighted the most relevant studies involving resveratrol in wound healing, scarring, and photo‐aging of the skin. A systematic review was performed and the database PubMed was searched for suitable publications. Only original articles in English that investigated the effects of resveratrol in wound healing, scarring, and (photo‐)aging of the skin were analysed. The literature search yielded a total of 826 studies, but only 41 studies met the inclusion criteria. The included studies showed promising results that resveratrol might be a feasible treatment approach to support wound healing, counteract excessive scarring, and even prevent photo‐aging of the skin. Resveratrol represents an interesting and promising novel therapy regime but to confirm resveratrol‐associated effects, more evidence based in vitro and in vivo studies are needed.

Introduction: Platelet-rich plasma (PRP) is gaining popularity and is applied in a variety of clinical settings. This review aims to present and evaluate available evidence regarding the use of PRP in various applications in plastic surgery. Methods: PubMed, Web of Science, Medline, and Embase were searched using predefined MeSH terms to identify studies concerning the application of PRP alone or in combination with fat grafting for plastic surgery. The search was limited to articles in English or German. Animal studies, in vitro studies, case reports, and case series were excluded. Results: Of 50 studies included in this review, eleven studies used PRP for reconstruction or wound treatment, eleven for cosmetic procedures, four for hand surgery, two for burn injuries, five for craniofacial disorders, and 17 as an adjuvant to fat grafting. Individual study characteristics were summarized. Considerable variation in preparation protocols and treatment strategies were observed. Even though several beneficial effects of PRP therapy were described, significance was not always demonstrated, and some studies yielded conflicting results. Efficacy of PRP was not universally proven in every field of application. Conclusion: This study presents an overview of current PRP treatment options and outcomes in plastic surgery. PRP may be beneficial for some indications explored in this review; however, currently available data are insufficient and systematic evaluation is limited due to high heterogeneity in PRP preparation and treatment regimens. Further randomized controlled trials employing standardized protocols are warranted.

Burn injuries are to this day a major cause of morbidity and mortality, especially within low- and middle-income countries. Understanding the etiology of burn injury and epidemiologic- and hospital-specific factors associated with burns is vital for allotting resources for prevention and treatment. Therefore, the purpose of this study was to develop a profile of epidemiological differences in burn care and the ideal burn dressing among the different continents based on a global online survey.This analysis evaluated trends in demographics, epidemiology of burn care, burn incidence, infection, related mortality and burn treatment (e.g., dressing changes and materials). The objective of this study was to investigate and compare the epidemiological profile of burn injury/care amongst the continents and a global control group to determine their utility for guiding evidence-based burn care and identify differences and/or similarities in their clinical practice.A retrospective analysis of data was performed that was acquired during a previous study investigating the ideal burn dressing on a global perspective. The data was analyzed depending on the continent, on which the respondent indicated their hospital to be (Africa, AustraliaNew Zealand, Asia, Europe, Middle and South America, North America). Statistical analysis was performed to evaluate patient and hospital demographics and variables associated with burn injuries and their treatment. Outcomes of interest also included infections, mortality, length of stay on the ICU and important burn dressing characteristics.Healthcare providers in different areas of the world share similar views and needs regarding burn care management and on what constitutes an ideal burn dressing. We found significant differences in the various continents regarding hospitalization and length of stay on the ICU, with Australia taking the lead. Africa, with a high proportion of low-income-countries, reported the highest rate of burn infections, mortality, and a disproportionally high number of burn incidences amongst children. In general, men were mostly obtaining burn injuries amongst all continents. We found no significant differences regarding the most important characteristics of an ideal burn dressing.Our results suggest significant epidemiological differences regarding burn injuries and care amongst the continents, possibly resulting from the different infrastructure and/or circumstances on the various continents. Future scientific studies need to focus on adequate pain management and designing longer lasting materials that contain the "ideal" properties, by also taking individual regional needs/desires and the patient's perspective and economic boundaries into account. This analysis has delivered valuable insights into the epidemiological differences and/or similarities amongst the various continents.

Highlights • Large hospitals with burn units face particular challenges during the COVID-19 pandemic. • The strategy of the University Hospital Graz, including the way back to normality are presented. • Re-booting measures need to be elaborated as carefully as lock-down measures. • Measures include infrastructure, patients and staff and need to be coordinated with local authorities., The first half of the year 2020 has been shaped by quarantines and lock-downs all over the world. The novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has caused a pandemic, that slowed down not only social interactions and economy, but also medical and health care. Governments and hospitals were forced to create ad hoc emergency plans maintaining the balance between an adequate participation in collective response of shutting-down to avoid a further spreading of the virus, while preserving the ongoing acute care and simultaneously being able to react to an imminent overextension with a collapse of capacities. The University Hospital Graz is one of the largest hospitals in Austria. As transregional trauma and burn centre it provides care for people from all over Austria and faced special challenges. We present the strategy of the University Hospital Graz in dealing with the COVID-19 pandemic and the way back to (new) normality. The strategy includes infrastructural, patient-centred and staff-centred measures. The continuously low numbers of new infections in Austria allowed a loosening of the lock-down measures already. Particular attention has to be paid to attentive screening of patients and triaging of surgeries during the re-boot. The re-boot needs to be slow and steady to reduce the risk of an infectiological relapse. Once this pandemic is defeated, a careful re-evaluation of the different internationally applied strategies should be performed to be prepared for the future.

Summary Background High temperatures at workplaces lead to health-related risks and premature exhaustion. The coronavirus disease 2019 (COVID-19) pandemic requires many health professionals to perform under unfavorable conditions. Personal protective equipment (PPE) causes thermal stress and negatively affects performance. Patients, materials and methods This pilot project investigated the effects of PPE and additional cooling wear on physiological parameters and concentration of six healthy staff members of the Plastic Surgery Department of the Medical University of Graz, Austria during simulated patient care. In this study two 1‑hour cycles with patient care-related tasks with PPE and PPE + cooling-wear, respectively, were conducted. A third cycle with scrubs exclusively served as baseline/negative control. The assessment occurred immediately pre-cycles and post-cycles. Results Pre-cycle assessments showed no significant differences between the cycles. After PPE cycle, increased physical stress levels and decrements in concentration capacity were observed. Physiological parameters were significantly less affected in the cooling cycle, while concentration capacity slightly increased. Conclusion COVID-19 PPE causes considerable thermal stress, ultimately affecting human performance. As opportunity to withstand thermal stress, and improve patients’ and professionals’ safety, cooling-wear can be considered relevant. Medical personnel performing in exceptional situations may particularly benefit from further development and investigation of cooling strategies.

Background DNA damage is one of the main factors responsible for photoageing and is predominantly attributed to ultraviolet irradiation (UV‐R). Photoprotection by conventional sunscreens is exclusively prophylactic, and of no value, once DNA damage has occurred. As a result, the demand for DNA repair mechanisms inhibiting, reversing or delaying the pathologic events in UV‐exposed skin has sparked research on anti‐photoageing and strategies to improve the effect of conventional sunscreens. This review provides an overview of recent developments in DNA repair enzymes used in sunscreens and their impact on photoageing. Methods A systematic review of the literature, up to March 2019, was conducted using the electronic databases, PubMed and Web of Science. Quality assessment was carried out using the Newcastle‐Ottawa scale (NOS) to ensure inclusion of adequate quality studies only (NOS > 5). Results Out of the 352 publications, 52 were considered relevant to the key question and included in the present review. Two major enzymes were found to play a major role in DNA damage repair in sunscreens: photolyase and T4 endonuclease V. These enzymes are capable of identifying and removing UV‐R‐induced dimeric photoproducts. Clinical studies revealed that sunscreens with liposome‐encapsulated types of photolyase and/or T4 endonuclease V can enhance these repair mechanisms. Conclusion There is a lack of randomized controlled trials demonstrating the efficacy of DNA repair enzymes on photoageing, or a superiority of sunscreens with DNA repair enzymes compared to conventional sunscreens. Further studies are mandatory to further reveal pathogenic factors of photoageing and possible therapeutic strategies against it.

Hypertrophic scars are still a major burden for numerous patients, especially after burns. Many treatment options are available; however, no evidence‐based treatment protocol is available with recommendations mostly emerging from experience or lower quality studies. This review serves to discuss the currently available literature. A systematic review was performed and the databases PubMed and Web of Science were searched for suitable publications. Only original articles in English that dealt with the treatment of hypertrophic scars in living humans were analyzed. Further, studies with a level of evidence lower than 1 as defined by the American Society of Plastic Surgeons were excluded. After duplicate exclusion, 1638 studies were screened. A qualitative assessment yielded 163 articles eligible for evidence grading. Finally nine studies were included. Four of them used intralesional injections, four topical therapeutics and one assessed the efficacy of CO2‐laser. Intralesional triamcinolone + fluorouracil injections, and topical pressure and/or silicone therapy revealed significant improvements in terms of scar height, pliability, and pigmentation. This systematic review showed that still few high‐quality studies exist to evaluate therapeutic means and their mechanisms for hypertrophic scars. Among these, most of them assessed the efficacy of intralesional triamcinolone injections with the same treatment protocol. Intralesional injection appears to be the best option for hypertrophic scar treatment. Future studies should focus on a possible optimization of infiltrative therapies, consistent end‐point evaluations, adequate follow‐up periods, and possibly intraindividual treatments.

International audience; PurposePaediatric burn care is a delicate discipline which benefits from special attention. Despite being highly effective, the current standard of care for second degree burns in the largest paediatric burn center in France – exposure to infrared light – involves long hospital stays, straining economic and professional resources, especially in times of a pandemic. The present study investigated this standard of care and compared it to the use of a bacterial nanocellulose dressing.Materials and methodsA retrospective analysis of two groups has been performed: the control group assessed thirty consecutive children treated with the standard of care, and the intervention group assessed thirty consecutive children treated with the bacterial nanocellulose dressing. Parameters evaluated were: healed wounds, additional treatments, rate of infections, hospital length of stay, pain experience and overall satisfaction.ResultsThe two groups did not differ significantly in terms of age and TBSA. A significant reduction in hospital length of stay (p < .001) and pain experience (p < .001) could be observed. In terms of healed wounds, additional treatments and infections, the two groups were equally matched (p > .05) with satisfactory results in both groups. Tendencies towards better results could be seen in the intervention group.ConclusionThe use of bacterial nanocellulose wound dressings is an important tool in the armamentarium of today’s burn surgeons. Satisfying results were achieved, ameliorating burn care for children. Future studies are indicated to further support its value and assess the economic impact.

Chronic wounds are a challenging medical entity for patients, medical professionals and healthcare systems. Frequently, patients present themselves to wound specialists after months or even years of unsuccessful treatment. Recent developments have resulted in a multitude of different advanced wound dressings created to treat complex, chronic wounds, one of which is the polylactide dressing Suprathel. This study aimed at investigating the healing potential of Suprathel in chronic wounds and differentiating between old and "young", diabetic and non-diabetic chronic wounds. A prospective, multicentric, non-controlled intervention study was conducted, treating patients with chronic lower leg ulcers (>3 months) with Suprathel and assessing them weekly. Afterwards, a retrospective analysis was performed analysing the wound size initially, after 4 and after 8 weeks of treatment. Furthermore, a differentiation between diabetic and non-diabetic, and chronic wounds older and younger than 12 months, was assessed. A significant reduction in wound size was observed in the study population after 8 weeks of treatment. The effect size in the diabetic wound and the old chronic wound group even reached more than one, with the other groups still showing a large effect of the intervention. This study shows that Suprathel is a valuable tool in the armamentarium of a wound specialist. Not only could we show a positive effect on chronic wounds, we could even demonstrate a significant wound size reduction in chronic wounds of old and young, as well as diabetic wounds, with the treatment of older chronic and diabetic wounds yielding an even larger effect size. Further randomised, controlled studies are necessary to show the full potential of advanced wound dressing materials in large patient cohorts.

Perforator flaps have become one of the leading procedures in microsurgical tissue transfer. Individual defects require a tailored approach to guarantee the most effective treatment. A thorough understanding of the individual vascular anatomy and the location of prominent perforators is of utmost importance and usually requires invasive angiography or at least acoustic Doppler exploration. In this study, we aimed at evaluating different non-invasive imaging modalities as possible alternatives for perforator location detection. After a cooling phase, we performed thermal, hyperspectral and Laser Doppler imaging and visually evaluated a possible detection of the perforator for a period of five minutes with an image taken every minute. We identified the most prominent perforator of the deep inferior epigastric artery by handheld acoustic Doppler in 18 patients. The detected perforator locations were then correlated. Eighteen participants were assessed with six images each per imaging method. We could show a positive match for 94.44%, 38.89%, and 0% of patients and 92.59%, 25.93%, and 0% of images for the methods respectively compared to the handheld acoustic Doppler. Sex, age, abdominal girth, and BMI showed no correlation with a possible visual detection of the perforator in the images. Therefore, thermal imaging can yield valuable supporting data in the individualized procedure planning. Future larger cohort studies are required to better assess the full potential of modern handheld thermal imaging devices.

Objective The increasing prevalence of obesity is a major health problem worldwide. Several non-surgical treatments are now available that reduce body and subcutaneous fat mass. We aimed to determine the efficacy of mild cold for body mass reduction. Methods Novel cooling wear, which induces mild cooling via evaporation, was worn by 29 women with overweight for 4 weeks. Specifically, the participants wore a cooling waist belt and chaps for 1 hour per day. Non-invasive lipometry was used to determine their subcutaneous adipose tissue thicknesses, and the total weight loss, abdominal circumference, and body mass index (BMI) of the participants were measured. Results The participants achieved a significant total weight loss of 0.7 kg (0.9%), and significant reductions in BMI (0.2 kg/m2) and abdominal circumference (1.9 cm, 1.7%). Furthermore, there was a trend towards a reduction in abdominal subcutaneous fat thickness and a significant reduction in thickness of the anterior thigh was noted. A questionnaire-based evaluation indicated high usability and comfort of the cooling wear. Conclusion There is a high and growing demand for non-invasive treatment strategies for obesity. Cooling wear represents a novel and promising approach that may be of particular use for individuals who do not require bariatric surgery.

Acute infections of the hand can be a pathology with severe consequences. Alongside the surgical therapy, it is necessary to establish a systemic antiinfective therapy as well. The most frequent bacteria in acute hand infections are Staphylococcus aureus and, less frequently, different Streptococci. If the infection is the result of a bite wound, the most frequently found bacterium is Pasteurella multocida. Fortunately, the susceptibility to frequently used antibiotics in the (middle-)European area is quite good - according to the literature, resistances are rare. First line antibiotics are 1st and 2nd generation cephalosporins as well as aminopenicillins in combination with beta-lactamase inhibitors. Especially in multi-morbid patients or infections with unusual aetiology, a broader bacterial spectrum is to be expected. It is very effective to collect a tissue sample or swab for microbiological analysis before the establishment of the antiinfective therapy to gain valuable information about the prospective therapy. Ultimately, hand infections are a pathology to be treated with increased attention to avoid severe complications. A close cooperation with the involved specialties and physiotherapists should be sought to guarantee the best possible outcome.Akute Infektionen der Hand können ein schwerwiegendes Krankheitsbild darstellen. Neben der chirurgischen Therapie ist die Etablierung einer antibiotischen Therapie in den meisten Fällen Mittel der ersten Wahl. Die häufigsten vorkommenden Keime sind Staphylococcus aureus sowie verschiedene Streptokokken. Bei Bisswunden ist zusätzlich Pasteurella multocida sehr häufig vertreten. Resistenzen gegen Antibiotika der entsprechenden Keime sind der publizierten Literatur zu Folge im (mittel-)europäischen Raum glücklicherweise selten, sodass Cephalosporine der 1. oder 2. Gruppe sowie Aminopenicilline mit Betalaktamaseinhibitoren die Mittel der Wahl darstellen. Insbesondere bei Begleiterkrankungen oder ungewöhnlicher Ätiologie der Infektion ist jedoch ein breiteres Keimspektrum zu erwarten, sodass eine Gewebeprobe zur Etablierung der optimalen antibiotischen Therapie wertvolle Informationen liefert. Infektionen der Hand sollten in jedem Fall mit besonderer Aufmerksamkeit engmaschig betreut werden, um gravierende Komplikationen zu verhindern. Dies sollte in enger Zusammenarbeit mit den beteiligten Fachdisziplinen sowie Physiotherapeuten erfolgen.

Purpose The field of Plastic Surgery is prominent on social media around the world. Board certified plastic surgeons and societies of plastic surgery play a role in providing accurate, evidence-based information to the public, patients, and colleagues. The aim of this study was to explore the use of social media by European Plastic Surgery Societies. Methods and materials A retrospective analysis of the presence and activity of European Plastic Surgery Societies on Facebook, Twitter and Instagram was conducted between December 12th 2018 and December 12th 2019. The results have been compared to the American Society of Plastic Surgeons. Results Twenty, eleven and nine European societies yielded an active account on Facebook, Twitter and Instagram respectively. Only seven European societies had an account on all three platforms and were therefore considered polypresent. The amount of followers of those seven societies was significantly higher than of the others (p-value = 0.02). Their activity yielded significantly more posts on Facebook (p-value = 0.02). The American Society of Plastic Surgeons had more followers on all three platforms than all European societies combined. Conclusion Social media are still rather unexploited by European Plastic Surgery Societies. A tendency towards increased visibility can be observed, yet a higher penetration is required to further educate and engage through social media. The quantitative data provided serve as reasonable foundation for further studies and a guide for growth of #PlasticSurgery.

Burn injuries initiate numerous processes such as heat shock response, inflammation and tissue regeneration. Reliable burn models are needed to elucidate the exact sequence of local events to be able to better predict when local inflammation triggers systemic inflammatory processes. In contrast to other ex vivo skin culture approaches, we used fresh abdominal skin explants to introduce contact burn injuries. Histological and ultrastructural analyses confirmed a partial-thickness burn pathology. Gene expression patterns and cytokine production profiles of key mediators of the local inflammation, heat shock response, and tissue regeneration were analyzed for 24 h after burn injury. We found significantly increased expression of factors involved in tissue regeneration and inflammation soon after burn injury. To investigate purely inflammation-mediated reactions we injected lipopolysaccharide into the dermis. In comparison to burn injury, lipopolysaccharide injection initiated an inflammatory response while expression patterns of heat shock and tissue regeneration genes were unaffected for the duration of the experiment. This novel ex vivo human skin model is suitable to study the local, early responses to skin injuries such as burns while maintaining an intact overall tissue structure and it gives valuable insights into local mechanisms at the very beginning of the wound healing process after burn injuries.

Introduction Cooling of burn injuries is most important, not only to reduce pain but also to reduce the intradermal damage as well as the burn wound conversion. Studies have shown that cooling for about 20 to 30 minutes using only plain tap water at moderate temperature is most efficient resulting in least intradermal damage. However, many burn injuries reach the hospital without any pre-clinical cooling, possibly due to the lack of a cooling agent. After a pilot study, we investigated if a bacterial nanocellulose (BNC)-based wound dressing containing about 95% water can cool a burn injury and if so the effect suffices to reduce the damage in the skin. Methods Skin explants from human donors were burned with inflicted a contact burn injury, of which half were treated with a BNC-based wound dressing and a paraffin gauze dressing. Intradermal temperature sensors measured the temperature changes in the dermis over the course of 24 hours. Biopsies were taken for histological evaluation at different time points. Results The intradermal measurements show high temperature spikes at the moment of the burn injuries. After the application of a BNC-based wound dressing the intradermal skin temperature was significantly reduced. The area under the curve in the treated group was significantly less than the untreated. The histological assessment showed according results with less damage in the treated group in comparison to the untreated. Conclusions Bacterial nanocellulose-based wound dressings with high water content significantly lower the intradermal temperature after a contact burn and reduce the thermal damage inflicted to the skin. A secondary dressing that permits the water to evaporate slower additionally prolongs the cooling effect. The use of such a wound dressing could find use in a preclinical setting where other cooling options are not available. Applicability of Research to Practice The findings of this experiment should be tested in an in-vivo setting prior to clinical use to investigate the possibility of inducing hypothermia with this treatment.

Introduction Bacterial nanocellulose (BNC) is a novel wound dressing that consists of nearly 95% water. This hydrophilicity allows this matrix to absorb and release aqueous substances. We investigated how well BNC can absorb antiseptic substances in order to create on demand antimicrobial wound dressings. Methods Sheets of BNC-based wound dressings were placed in four different antiseptic substances. Punch biopsies were taken at different time points and the concentrations of the antiseptic agent was measured. Two PHMB-containing solutions, one octenidine-containing and one povidone-iodine-containing solution were tested. In addition, the release of the substances from the punch biopsies was examined. To test the efficacy of these novel wound dressing, the antimicrobial activity of the BNC sheets loaded with the antiseptic solutions were tested against Staphylococcus aureus. Results All antiseptic solutions showed excellent uptake into the BNC as well as release. Especially the PHMB- and octenidine-containing solutions already showed high values after only 30 minutes. The overall achieved concentrations were all highly effective against Staphylococcus aureus and were all higher than the minimal bactericidal concentration against MRSA. Conclusions Antiseptic, water-based solutions are excellently absorbed in a very short time and are released steadily over a period of time dependant on the size of the molecules. All tested antiseptic solutions reached effective antibacterial concentrations making them all suitable for the making of antiseptic BNC-based wound dressings. However, when using a commercially available solution and not a solution containing only the active ingredient, it must be taken into consideration that all ingredients have an effect on the uptake of the active substance and thus influence the maximum uptake and release concentration. Applicability of Research to Practice The findings of this experiment are ready to be used in practice.

Introduction Many professional groups have to work in places with high temperatures; this includes, for example, doctors and nursing staff working at burn centres. Increased ambient temperature during the care of severely burned patients in the operating theatre and intensive care unit is used to mitigate the loss of thermoregulation, prevent hypothermia, and minimize the impact of hypermetabolism. However, experimental evidence indicates, that even relatively mild thermal stress may affect human performance. Novel cooling strategies have been invented for reducing thermal stress in people, who are occupationally exposed to high temperatures and have for instance already been tested in the military field. Here, the present study investigated the effects of cooling wear on the performance under high ambient temperatures. Methods Effects of cooling wear on concentration and performance of surgeons were investigated in 12 subjects during a simulated burn surgery. Subjects were divided into two groups, one group wearing cooling wear and one control group with normal scrubs. Directly before the exposure to high ambient temperatures, subjects of both groups underwent standardized tests for concentration, manual dexterity and measurements of physiological parameters. After a simulated burn surgery of 1 hour, subjects underwent the same analysing procedure again. Results Results proved that even relatively mild thermal stress affects performance whereby complex actions, that require high concentration, are primarily affected. Initial values of both groups showed approximately homogenous values. After heat exposure, however, subjects who received cooling wear showed higher results in tests for concentration and manual dexterity. Furthermore, the comparison of physical parameters indicates the ability of cooling wear to reduce thermal stress and its’ negative effects on the human organism. Conclusions Decrements in vigilance, performance and endurance are well-documented effects of thermal stress. As an opportunity to withstand thermal stress and therefore improve medical care, cooling wear showed good results in many aspects. Applicability of Research to Practice Based on these promising results cooling strategies may be used as an important tool in medical sectors in the future. Burn medicine may particularly profit from further development and rigorous investigation of cooling strategies.

Introduction Inflammation is part of the physiological phases of wound healing. It serves the purpose to attract different immune cells in order to clean the wound from pathogens and debris and create an ideal environment for fibroblasts and keratinocytes to differentiate, migrate and divide in order to close the wound. Pathological inflammation caused by many different factors is often the underlying cause of prolonged wound healing and unfavourable outcome in burn patients. We wanted to investigate what influence an induced hyper-inflammation on wound healing has in a controlled environment. Methods In a porcine wound model, pigs received full-thickness wounds on their backs where hyper-inflammation was induced by application of a chemotherapeutic for 6 days. Control wounds were left without induction. Wound were scored on a daily basis for 16 days in total and biopsies were taken for RNA analysis as well as histological assessment. Results The results showed a rise in inflammation of the wounds and the surrounding tissue due to the induction. The wounds healed slower, needing up to seven more days to completely heal. The results of the RNA analysis showed high values of pro-inflammatory cytokines after the induction in comparison to the baseline and control wounds. Histological assessment showed thick layers of necrosis, adipocyte as well as leucocyte infiltration in the hyper-inflamed wounds compared to completely healed control wounds with all layers of epidermis visible. Conclusions Hyper-inflammation, even just for a short period of time, can significantly prolong the time of wound healing. These findings underline the importance of preventing and treating wound infections of burn patients in order to support physiological wound healing as well as to avert complications such as infections with multi-resistant microbes that are associated with prolonged hospital stays. Applicability of Research to Practice The findings of these experiments cannot be directly applied to practice however, the influence of inflammation should kept in mind when treating burn patients.