Drug-induced immunosuppression in plastic and reconstructive surgery: A matched pair outcome analysis of 108 patients.

BACKGROUND: Plastic and reconstructive surgeons occasionally have to manage patients with the intake of immunosuppressive drugs while the individual risks for complications present unclear. This study aimed to analyze complication rates after surgery on patients with drug-induced immunosuppression. METHODS: Patients with a perioperative intake of immunosuppressive drugs who had undergone plastic surgery between 2007 and 2019 in our Department of Plastic, Aesthetic, Hand, and Reconstructive Surgery were analyzed retrospectively. Another cohort with the same or similar surgical procedures but without drug-induced immunosuppression was determined. A total of 54 immunosuppressed patients (IPs) were case-control matched with 54 comparable control patients (CPs). The 2 groups were compared for the outcome parameters of complication rate, revision rate, and length of hospital stay. RESULTS: Matching achieved a 100% match for surgical procedures and sex. The mean age difference within paired patients was 2.8 years (0-10 years), while the mean age was 58.1 years in all patients. A total of 44% of IP showed signs of impaired wound healing in contrast to only 19% of CP (OR 3.440; 95%CI: 1.471-8.528; p = 0.007). The median hospital stay of IP was 9 days (range 1-110 days) compared to 7 days (range 0-48 days) of CP (p = 0.102). The revision operation rate was 33% in IPs and 21% in CPs (p = 0.143). CONCLUSIONS: Patients with drug-induced immunosuppression who underwent plastic and reconstructive surgery have an increased risk for impaired wound healing in general. Additionally, our study showed a trend towards a longer hospital stay and operation revision rate. Surgeons have to consider these facts when treatment options are discussed in patients with drug-induced immunosuppression.

[Interdisciplinary extremity board in the treatment of complex injuries]. / Interdisziplinäres Extremitäten-Board in der Behandlung von Komplexverletzungen.

BACKGROUND: Interdisciplinary case conferences are well-established in the field of oncology in order to provide the best possible treatment for patients with complex disease patterns which overlap several disciplines. METHODS: After studying the available literature the aims, indications, frequency, patient enrolment and documentation modalities, disciplines necessary to create the reconstruction plan and evaluation parameters of the board, were agreed in an interdisciplinary discussion among colleagues. The utilization of the extremity board and demographic features of the cases presented in the extremity board within the first 6 months were subsequently descriptively analyzed. RESULTS: The agreed primary aim of an extremity board is the timely and transparent preparation of a high-quality holistic reconstruction plan for optimized treatment of a challenging patient collective with complex injuries of the extremities. Decisive interfaces of an extremity board are the participation of interdisciplinary disciplines, established enrolment and documentation modalities and a longitudinal analysis of parameters of the acute medical treatment, the long-term function and quality of life of those affected. The patient collective so far mostly includes men under 40 years old with traumatic soft tissue defects and combined injuries. On average, reconstruction plans for 1-2 patients were approved in an interdisciplinary team per session. CONCLUSION: The extremity board serves as a platform for coordinated planning of treatment for patients with complex injuries. The limited personnel and time resources represent the greatest challenge for the successful implementation. The extremity board enables a high degree of interdisciplinary networking. The digital registration and documentation modality within the internal hospital documentation system is of utmost relevance. The preparation of the reconstruction plan is of decisive importance for the qualitative success of treatment and the restoration of function. The longitudinal analysis of appropriate parameters is imperative to measure the quality of treatment.

[Registry Research Funding of the German Society of Plastic, Reconstructive and Aesthetic Surgery (DGPRÄC) and Research Funding Report 2021/2022]. / Register Forschungsförderung der Deutschen Gesellschaft für Plastische, Rekonstruktive und Ästhetische Chirurgie (DGPRÄC) und Forschungsförderungs-Bericht 2021/2022.

BACKGROUND: Research is an integral part of academic medicine. In plastic surgery, it sets the course for innovations in the specialty. The purpose of this study is to present the research performance of plastic surgeons in Germany for the period 2021/2022 and to compare it with previous periods. MATERIALS AND METHODS: The directors of plastic surgical academic institutions reported all requested/approved and rejected research applications to public, non-public and industrial funding organizations. Data was gathered within an established online database. In addition, the DFG´s public database GEPRIS was screened for plastic surgical research grants. Data was also collected regarding research infrastructure and organization at the participating centers. RESULTS: 105 applications were reported to 54 different funding agencies from 20 plastic surgery centers. 37 funding applications were submitted to the major public funding agencies DFG, BMBF, BMWi, BMG, BMVg, G-BA and EU. Of these, 59,5% (22/37) were DFG, 13,5% (5/37) each BMBF and EU, 5,4% (2/37) BMWi, and 2,7% (1/37) each BMG, BMVg, and G-BA applications. The average funding volume of these proposals was 401,515 euros. Approved DFG proposals were most frequently assigned to the review board 205-27 Orthopedics, Trauma Surgery, Reconstructive Surgery (n=10/16, 62,5%). Over time, the research registry shows an increase in the number of proposals in general and those granted. 70,0% (14/20) of participating sites had their own experimental research laboratory, while only 40,0% (8/20) had their own clinical trial center. CONCLUSION: The 2021/2022 Research Funding Report once again highlights the impressive research accomplishments of the plastic surgery community.

Sustained high demand for intensive care unit resources for the treatment of burn patients during the COVID-19 pandemic in Northern Germany: A single-centre cross-sectional study.

Introduction: The ongoing COVID-19 pandemic caused by SARS-CoV-2 has changed everyday life worldwide. To reduce disease transmission, governments introduced various policies such as social distancing, stay-at-home orders, and travel restrictions. The goal of this study was to investigate the characteristics of burn patients admitted to the burn intensive care unit before and during the COVID-19 pandemic. Patients and methods: A retrospective descriptive analysis of the hospital's burn registry was performed from 1 March 2019 until 1 January 2022. Results: A total of 326 patients were included in this study. Eighty-eight patients presented before and 238 patients during the COVID-19 pandemic. The majority of burns occurred during private incidents (80% [2022], 92% [2020]), and burns were most frequently caused by flames (24% [2022], 32.99% [2021]). Work-related injuries occurred less frequently (7.76% [2020], 20% [2022]). Constant results were obtained regarding severity and total body surface area affected (1-80%). Conclusion: This study highlights high numbers of burn patients admitted to the burn intensive care unit before and during the COVID-19 pandemic. Consequently, burn intensive care units must retain their special position within the national health system and should not be included in resource relocation during the prioritisation of intensive care resources. Multicentre studies should focus on the national impact of COVID-19 on the treatment of burn patients.

Does patient load affect clinical outcome of burn patients in specialized centers? An analysis of the German Burn Registry.

Hospital volume has been identified as an independent outcome parameter for a number of medical fields and surgical procedures, and there is a tendency to increase required patient numbers for center verification. However, the existing literature does not support a clear correlation between patient load and clinical outcome in adult burn care and recent data from Germany does not exist. We therefore evaluated the effect of patient volume in German burn centers on clinical outcome. Patient data was extracted from the German Burn Registry from 2015 to 2018. For better inter-center comparability, solely burn patients with a TBSA ≥ 10% were included. Mortality, number of surgeries and length of stay (LOS) were evaluated with respect to burn center patient volume. Burn center volume was divided into two and three groups. A total of 2718 patients with a TBSA ≥ 10% were admitted to the participating 17 burn centers. Independent from the division of patient data into either 2 or 3 groups, the TBSA and ABSI score-related severity of burn injuries were comparable between groups. There was no significant difference in mortality due to center size. Nevertheless, patients treated in large volume burn centers showed a significantly increased LOS (+4.5 days, [1.9-7.2] CI, p = 0.001) and required significantly more surgeries (+0.5 surgeries [0.2-0.8] CI, p = 0.002) when compared to the small volume centers. A similar phenomenon regarding mortality and LOS (p 0.001) was observed after dividing the centers into two groups. Interestingly a division into three groups showed significant differences with the best outcome for patients in medium-volume centers. Nevertheless, mortality did not differ significantly. Therefore, our data demonstrates that in contrast to many other medical fields, outcome and mortality are not automatically improved in burn care by simply increasing the patient load, at least in centers treating 20-100 BICU patients/year.

[Reconstruction in polytraumatized burn patients]. / Rekonstruktion beim polytraumatisierten Brandverletzten.

BACKGROUND: Polytraumatized burn patients represent a rare patient collective and necessitate an individualized treatment concept due to the particular combination of injuries. OBJECTIVE: Against the background of this special injury pattern, especially with deep burns overlying the fracture zone, the question of a specific and interdisciplinary treatment algorithm arises. MATERIAL AND METHODS: This article is based on a PubMed database search and experiences of a trauma center for severely injured burn patients at a university hospital, with presentation of the special therapeutic requirements and goals exemplified by a case report. RESULTS: The evaluation of the literature search and own treatment results comes to the conclusion that the rate and extent of amputations and infections can be reduced by an early and interdisciplinary involvement of the plastic surgeon by early combined fracture stabilization, excision of necrotic tissue and immediate skin grafting. Furthermore, plastic reconstructive procedures enable a functional and esthetic reconstruction with optimized prosthesis fitting. CONCLUSION: Polytraumatized severely burned patients necessitate an interdisciplinary treatment approach, whereby preservation of length, functionality and esthetic appearance of the affected extremities and concurrent avoidance of bone and soft tissue infections have utmost priority.

Proprioceptive elbow training reduces pain and improves function in painful lateral epicondylitis-a prospective trial.

BACKGROUND: In painful epicondylitis, previous studies reported deficiencies in elbow proprioception. In line, proprioceptive training of the lower limb has been reported substantial beneficial in a number of indications. Therefore, we have asked if a specified proprioceptive training using training devices that are capable of activating the deep musculature in the upper limb is able to reduce the symptoms of epicondylitis. MATERIALS AND METHODS: We included 71 patients with painful lateral epicondylitis > 3 months. INTERVENTIONS: Group A: Proprioceptive training intervention with a Flexibar® (9 min daily for 12 weeks). Group B: at least 40 min running or walking/week with the XCO® in addition to the proprioceptive training with the Flexibar® (9 min daily for 12 weeks), follow-up for 12 weeks. Primary end point: Pain on visual analogue scale (VAS, 0-10); secondary end points: DASH-Score (0 = very good, 100 = very poor), grip strength according to Jamar dynamometer (kg), vibration sensation measured with a 128 Hz tuning fork. RESULTS: The pain on VAS in group A was reduced significantly. 3.6 ± 2.0 to 2.4 ± 2.1 (-33%, p = 0.013), and from 3.7 ± 2.4 to 2.2 ± 1.9 (-41%, p = 0.004) in group B after 12 weeks. There was no significant difference between A and B (p = 0.899). In both groups, there was a significant improvement of the DASH-Score (A: 32 ± 15 to 14 ± 12, -56%, p < 0.001; B: 27 ± 12 to 12 ± 11, -55%, p = 0.001) without any difference between groups A and B (p = 0.339). Grip strength improvement in group A from 24 ± 12 to 33 ± 11 kg (+38%, p < 0.001), and from 29 ± 14 to 34 ± 11 kg (+15%, p < 0.001) in group B. In line, vibration sensation improved in both groups (A: 6.3 ± 0.6 to 6.5 ± 0.5, p = 0.0001; B: 6.3 ± 0.7 to 6.6 ± 0.5, p = 0.003). CONCLUSION: A 12-week proprioceptive training with the Flexibar® improves pain, quality of life, grip strength and vibration sensation in patients with painful lateral epicondylitis. LEVEL OF EVIDENCE: Ib, randomised clinical trial TRIAL REGISTRATION: German Clinical Trials Register, DRKS00024857 , registered on 25 March 2021-retrospectively registered, http://apps.who.int/trialsearch/.

Spider silk nerve graft promotes axonal regeneration on long distance nerve defect in a sheep model.

Peripheral nerve injuries with substantial tissue loss require autologous nerve transplantation or alternatively reconstruction with nerve conduits. Axonal elongation after nerve transection is about 1 mm/day. The precise time course of axonal regeneration on an ultrastructural level in nerve gap repair using either autologous or artificial implants has not been described. As peripheral nerve regeneration is a highly time critical process due to deterioration of the neuromuscular junction, this in vivo examination in a large animal model was performed in order to investigate axonal elongation rates and spider silk material degradation in a narrowly delimited time series (20, 30, 40, 50, 90, 120, 150 and 180 days) by using a novel spider silk based artificial nerve graft as a critical prerequisite for clinical translation. Autologous nerves or artificial nerve conduits based on spider silk of the spider species Trichonephila edulis were transplanted in a 6.0 cm nerve defect model in the black headed mutton. At each of the post-implant time point, electrophysiology recordings were performed to assess functional reinnervation of axonal fibers into the implants. Samples were analyzed by histology and immunofluorescence in order to verify the timeline of axonal regeneration including axonal regeneration rates of the spider silk implant and the autologous transplant groups. Spider silk was degraded within 3 month by a light immune response mainly mediated by Langhans Giant cells. In conjunction with behavioral analysis and electrophysiological measurements, the results indicate that the spider silk nerve implant supported an axonal regeneration comparable to an autologous nerve graft which is the current gold standard in nerve repair surgery. These findings indicate that a biomaterial based spider silk nerve conduit is as effective as autologous nerve implants and may be an important approach for long nerve defects.

[Registry Research Funding of the German Society of Plastic, Reconstructive and Aesthetic Surgeons (DGPRÄC) and Research Funding Report 2019/2020]. / Register Forschungsförderung der Deutschen Gesellschaft der Plastischen, Rekonstruktiven und Ästhetischen Chirurgen (DGPRÄC) und Forschungsförderungsbericht 2019/2020.

BACKGROUND: Since 2015/16 the DGPRÄC collects, evaluates and publishes the research activities of academic sections, departments and clinics for plastic surgery at university hospitals in Germany, in order to raise the awareness of plastic surgical research performance. MATERIALS AND METHODS: The directors of plastic surgical academic institutions were contacted via the DGPRÄC and asked to report any requested/approved and rejected research applications to public, non-public and industrial funding organizations. Data was collected in our previously established online database: https://docs.google.com/forms/d/e/1FAIpQLSe6F5xmTyw-k7VKJx_2jkPA4LBXsA0sgBGMrC3rx_4bHj6uzQ/viewform?usp=sf_link. In addition, applications were identified via the DFG's public database GEPRIS. RESULTS: A total of 41 funding applications to the public funding institutes DFG, BMBF, BMWi, BMG and EU were identified. 75.6 % (31/41) of the applications had already been approved at the time of data collection, of which 77.4 % (24/31) were DFG, 9.7 % (3/31) were BMWi, 6.5 % (2/31) were EU and 3.2 % (1/31) were BMBF or BMG applications. The average funding amounted to 358 301 Euro. In 50.0 % (12/24) of the cases, the approved DFG proposals were assigned to the subject review board 205-27 Orthopedics, Trauma Surgery, Reconstructive Surgery. CONCLUSION: The continuous publication of plastic surgical research funding reports submitted by the convention of university plastic surgeons of the DGPRÄC portraits the excellent, collaborative research activity in the field of plastic surgery.

Nephila edulis-breeding and care under laboratory conditions.

Due to fascinating mechanical and biological characteristics spider silk is of great interest in many research fields. Among the orb-weavers Nephila edulis is one of the species used as source for natural spider silk in laboratories. Under appropriate conditions, animals can be kept and bred easily. This manuscript gives information about the spiders' natural habitat, behavior, and breeding and compares them with the established methods and conditions within a research laboratory. Keeping conditions and methods of rearing are described in detail. Within a keeping facility with reliable supply of food, cannibalism rate is significantly reduced and spiders mate all year long. Cohabitants of the genus Steatoda are routinely found in laboratory keeping. While these small spiders do not pose a threat to Nephila edulis, cellar spiders (family Pholcidae) have to be extracted as they have been observed hunting for Nephila spiders.

In vitro construction of artificial blood vessels using spider silk as a supporting matrix.

Recent research has vigorously pursued the development of tissue-engineered vascular grafts (TEVs). One of the striking points of the early phase is the instability of the artificial blood vessels and lack of vascular resistance, which is supposed to be a consequence of unstable scaffolds. Therefore, alternative biological approaches are necessary to improve the physical properties of the artificial vessel walls. We developed blood vessel-like constructs based on native spider silk as a scaffold. C2C12 and ST1.6R cells were seeded on the surface of scaffolds and cultivated under pulsatile flow (max. ~135  mmHg and min. ~90  mmHg) in a bioreactor. Constructed grafts were compared to human blood vessels and cell seeded scaffolds cultured in the absence of bioreactor. Mechanical properties, morphological structures and expression of marker genes were assessed by strength and strain experiments, SEM, histological staining, immunohistology, Western blotting and quantitative real-time PCR. The results indicate that the constructed vessel resembles native blood vessels in morphological structure as well as in function and expression of biomarkers. Spider silk scaffolds seem to provide an optimal and stable basis for vessel constructs.

[Registry Research Funding of the German Society of Plastic, Reconstructive and Aesthetic Surgeons (DGPRÄC) and Research Funding Report 2017/2018]. / Register Forschungsförderung der Deutschen Gesellschaft der Plastischen, Rekonstruktiven und Ästhetischen Chirurgen (DGPRÄC) und Forschungsförderungs-Bericht 2017/2018.

INTRODUCTION: This report serves to publicize the research of academic institutions for Plastic Surgery within our society DGPRÄC in 2017/2018 and sequels the funding report of 2015/2016. Applications to public, non-public, or industrial funding organizations were evaluated. At the same time, this paper analyses the number of approved DFG applications in Plastic, Thoracic and Vascular Surgery in the GEPRIS system. Contrary to these specialties, Plastic Surgery is not classified as an independent speciality in the subject structure of the DFG review board which results in a lack of transparency concerning Plastic Surgery research work. MATERIALS AND METHODS: Our previously established online database (https://docs.google.com/forms/d/1OaSnHyKTysawiI1ie7kfUxDf7nJP_RiTUJTsnb7Mq_E/edit) for reporting requested/ approved and rejected research applications to public, non-public and industrial funding organizations was continued and evaluated together with applications found in the DFG's public database GEPRIS. RESULTS: Compared to the previous year's report, the number of approved applications from public research organizations (DFG, BMBF, BMWi, EU) was increased from 23 to 27. We identified 19 approved DFG applications from Plastic Surgery, as compared to 9 and 8 applications by Thoracic and Vascular Surgery, respectively. SUMMARY: Taken together, this data emphasizes that our research is at least equal to that of other newly established surgical specialties within the framework of the DFG. Accordingly, we hope to provide further arguments for an adaptation of the DFG review boards subject structure to include Plastic Surgery as an independent specialty as it is for Vascular Surgery and Thoracic Surgery.

[Reconstruction using the tensor fasciae latae muscle flap]. / Defektdeckung mit Musculus-tensor-fasciae-latae-Lappen.

OBJECTIVE: The tensor fasciae latae (TFL) muscle flap can be used for reconstruction of decubital ulcers in the trochanteric or ischial region. INDICATIONS: Deep decubital ulcers in the gluteal or ischial area after debridement and exhaustion of conservative measures. CONTRAINDICATIONS: Moribund or palliative patients who do not benefit from defect coverage and are likely to suffer a life-threatening complication. Noncompliant patients who cannot follow the postoperative recommendations or protocols in regard to positioning or recurrence prevention. The presence of extensive scars after previous operations in the donor area or irradiation of the donor area can lead to flap necrosis. SURGICAL TECHNIQUE: The TFL flap is commonly used as a regional transposition flap. Rare cases of a free TFL flap have been described. POSTOPERATIVE MANAGEMENT: Following surgery the patient needs to be positioned on the side or prone to prevent recurrence. Drains should be left for 5-7 days. Antibiotics are only needed in the case of persistent florid infection. RESULTS: The TFL muscle flap is known to be a reliable flap for the coverage of ulcers in the ischial and trochanteric region following radical debridement. This flap can also be transferred with its sensitive nerve supply resulting in a reduced chance of a recurring ulcer.

[Flap coverage using the posterior gluteal thigh flap]. / Defektdeckung mit posteriorem Oberschenkellappen.

OBJECTIVE: Defect coverage of the sacral, trochanteric or ischial region with durable tissue (gluteal thigh flap). INDICATIONS: Decubital ulcers of the sacral, trochanteric or ischial region after exhaustion of conservative measures. CONTRAINDICATIONS: Moribund or palliative patients who do not benefit from defect coverage and are likely to suffer a life-threatening complication. Noncompliant patients, who cannot follow the postoperative recommendations or protocols in regard to positioning or recurrence prevention. The presence of extensive scars after previous operations in the donor area or irradiation of the donor area can lead to flap necrosis. SURGICAL TECHNIQUE: The posterior gluteal thigh flap can either be used as a fasciocutaneous flap or in combination with the gluteus muscle as myofasciocutaneous flap. Further microsurgical transfers have been described. POSTOPERATIVE MANAGEMENT: Following surgery the patient needs to be positioned on the side or prone to prevent recurrence. Drains should be left for 5-7 days. Antibiotics are only needed in the case of persistent florid infection. RESULTS: The posterior gluteal thigh flap is a well-known, reliable and versatile option for coverage of decubital ulcers in the sacral and ischial region with low recurrence rates described in the literature.

[Defect coverage using gluteal flaps]. / Defektdeckung durch Gluteuslappen.

OBJECTIVE: Gluteal skin, fasciocutaneous and myocutaneous flaps can be used to cover decubitus ulcers in the sacral and ischiocrural area. INDICATIONS: Decubitus ulcers in the sacral or ischial area that do not heal after exhausted conservative therapy. CONTRAINDICATIONS: Moribund patients who are very likely to suffer a life-threatening complication. Non-cooperative patients who cannot follow the postoperative recommendations. The presence of extensive scars after previous operations in the donor area or irradiation of the donor area which may compromise the flap perfusion. SURGICAL TECHNIQUE: A distinction is made between local skin flaps, perforator-based fasciocutaneous flaps and the myocutaneous gluteus maximus flap. By partial or complete elevation of the gluteus maximus muscle based on the superior and inferior gluteal vessels, this flap is useful for larger and deep defects in the sacral and ischial region. For more superficial defects, fasciocutaneous perforator flaps might be used. Smaller ulcers can be treated with local skin flaps. The donor site should be closed primarily. POSTOPERATIVE MANAGEMENT: Consistent, postoperative relief by prone and lateral positioning of the patient, avoiding new decubitus ulcers. Drainage for at least 5-7 days. Antibiotic therapy is indicated only with appropriate detection of pathogens and in case of persistent infection. RESULTS: With distinct anatomical and improved technical knowledge, the use of fasciocutaneous and myocutaneous flaps in the gluteal region is now an established procedure and can be used for reliable coverage of sacral and ischiocrural decubitus ulcers.

A multimodal infection control concept in a burn intensive care unit - lessons learnt from a meticillin-resistant Staphylococcus aureus outbreak.

BACKGROUND: Meticillin-resistant Staphylococcus aureus (MRSA) is a frequently encountered pathogen in burn units. Burn patients are especially susceptible to MRSA acquisition and MRSA spread may cause outbreaks in burn units. AIM: To report the characteristics and successful control of an MRSA outbreak and to demonstrate a multimodal infection control concept. METHODS: In addition to a pre-existing infection control concept, several control measures were implemented including weekly prevalence screenings for MRSA, reinforcement of disinfection, restriction of admissions, and short-term unit closure. Epidemiologic investigation and environmental examinations were performed. The outbreak isolates were analysed by pulsed-field gel electrophoresis and spa-typing. A PubMed search was conducted, focusing on MRSA outbreaks in burn units. FINDINGS: This outbreak of hospital-acquired MRSA affected eight patients during a seven-month period, yielding an attack rate of 8%. Epidemiologic and environmental examinations suggested patient-to-patient transmission, which was confirmed by molecular analysis of bacterial isolates revealing a monoclonal pattern. In accordance with findings from other outbreaks in burn units, the implemented measures including patient screening and temporary unit closure resulted in successful control of the outbreak. CONCLUSION: A comprehensive concept is required to control the spread of all multidrug-resistant micro-organisms including MRSA on a burn unit. Where patients colonized or infected with MRSA appear to be the main reservoir, transfer of these patients to other units, or temporary closure of the unit, accompanied by intensive cleaning are very effective measures to stop transmission events.

Infection control in german-speaking burn centres: results of an online survey.

To systematically evaluate which infection control measures are in place in burn units, we conducted an online survey among 43 German-speaking burn units. The 29 units that responded and agreed to publication represented more than 125 patient beds. All units were located in advanced care hospitals. A total of 14 units provided single rooms only, and 22 units had a nurse-to-patient ratio of at least 1:2. Infection control practices included pre-emptive barrier precautions (29 units), the use of sterile filters for tap water supply (29 units), and an antibiotic stewardship program (24 units). Microbial screening of the patients on admission (23 units), regular prevalence screening (26 units) and surveillance of nosocomial infections (21 units) were also widely used. The high reply rate to the survey indicates the special relevance of infection control for burn units. Our survey shows that great efforts and several measures are being undertaken to address infection control challenges in burn patient care, but it also underlines the need for increased interdisciplinary infection control and antibiotic stewardship activities.

Afin d'évaluer les mesures préventives des infections déployées, nous avons réalisé une enquête en ligne auprès de 43 Centres de Traitement des Brûlés germanophones. Les 29 CTB ayant répondu (et accepté la publication) représentent 125 lits. Tous les CTB étaient situés dans des hôpitaux de référence. Quatorze CTB n'avaient que des chambres seules, 22 avaient un ratio infirmière/patient de1/2. Les mesures préventives comprenaient les précautions barrière (29), des filtres aux points d'eau (29), un programme d'évaluation de l'antibiothérapie (24). La cartographie bactérienne à l'entrée (23), la surveillance de la prévalence des infections (26) et des infections nosocomiales (21) étaient aussi régulièrement déployées. Le taux de réponse élevé pour ce type d'étude montre l'intérêt porté à la prévention des infections en CTB. Cette étude montre que les CTB portent une attention particulière à la prévention et à la surveillance des infections. Elle démontre aussi l'intérêt d'une approche multidisciplinaire et de la mise en place de programmes d'évaluation de l'antibiothérapie.

Interdisciplinary reconstruction of oncological resections at the skull base, scalp and facial region.

Extensive bone and soft tissue defects of the skull require unique plastic and reconstructive techniques to avoid and optimize aesthetic appearance following oncological resections. Procedures are ideally planned in an interdisciplinary board composed of neurosurgery, otorhinolaryngology, plastic and reconstructive surgery to facilitate reconstructive procedures of soft tissue and bone as early as possible in one approach. Large resections may require plastic surgery involvement from the beginning. Herein, we describe the function of a multidisciplinary approach to complex oncologic resections of the cranial base, scalp, and facial regions for neuro-oncologic patients.

Influence of direct or indirect contact for the cytotoxicity and blood compatibility of spider silk.

Spider silk became one of the most-researched biomaterials in the last years due to its unique mechanical strength and most favourable chemical composition for tissue engineering purposes. However, standardized analysis of cytocompatibility is missing. Therefore, the aim of this study was to investigate hemolysis, cytotoxicity of native spider silk as well as influences on the cell culture medium. Changes of cell culture medium composition, osmolarity as well as glucose and lactate content were determined via ELISA measurement. Possible hemolysis and cytotoxicity in vitro of spider silk were performed via measurement of hemoglobin release of human red blood cells or relative metabolic activity of L929 fibroblasts, respectively, according to international standard procedures. In ELISA measurement, no significant changes in medium composition could be found in this study. Spider silk was not hemolytic in direct and indirect testing. However, a borderline cytotoxicity according to definitions was found in indirect cytotoxicity testing. Nevertheless, in direct cytotoxicity testing, relative metabolic activity measurement revealed that spider silk is not cytotoxic under these conditions. This is the first study to conduct standardized tests regarding cytotoxicity and hemolysis of native spider silk, which might be considered inert in cell culture. As neither hemolysis nor cytotoxicity was found in direct contact in standardized procedures, safety in biomedical applications may be assumed. The indirect cytotoxicity seems to play a minor role in vivo. However, a borderline toxicity was revealed, suggesting potential leachables not yet identified. Displays one of the weaving frames used in this study after seeding with the single drop technique described herein.