[Definition of the quality of hand surgery]. / Definition von Qualität in der Handchirurgie.

The quality of treatment within the total concept of the healthcare system is subject to multifactorial influences. With the intention to improve the quality of hand surgery the German Society for Hand Surgery (DGH) has initiated a number of projects. These include the S3 guidelines codeveloped by the DGH, the hand trauma register of the DGH, the definition of criteria for hand surgical procedures to be performed in an outpatient setting within the framework of a consensus recommendation as well as participation in a large epidemiological study with the special documentation of pathological alterations of the hand to determine the prevalences (study of health in Pomerania, SHIP); however, within these projects the quality of treatment itself is not assessed. In the attempt to document the quality, the currently available quality indicators in hand surgery probably only evaluate the aspects really relevant for the patients to a limited extent. Therefore, the DGH participated at an early stage in the development of assessments within the international study named by the WHO as a lighthouse project. These developed and validated assessments are intended to include all aspects of the results including the individual patient view in order to precisely relate the quality of treatment to an exactly defined pattern of hand injury. The use of these assessments should permanently enable a prediction of outcome quality for each individual patient. All these projects require the largest involvement possible to collect as much data as possible. With this intention the DGH further coordinates and develops these projects within the committees of the extended executive board and attempts to motivate as many surgeons as possible to participate.

Advanced ASDEX Upgrade pellet guiding system design.

Cryogenic pellet injection will be the prime candidate to fuel future fusion power plants. In order to harvest optimum fueling performance, it is essential to inject pellets from the magnetic high field side of the tokamak. The pellet launching system of the tokamak ASDEX Upgrade injects cryogenic hydrogen pellets with a speed of up to 1000 m/s from the magnetic high field side via curved guiding tubes. Pellets passing the guiding tube are sliding on a gas cushion, generated by the Leidenfrost effect. The actual track has a rectangular cross section and is composed of a series of ellipses in order to generate the required 270° looping type turn; the path length is 17 m. The last part of this track is marked by strong geometrical constraints from the vacuum vessel port. The previous design was composed of a sequence of three sections of ellipses too, tangentially constant but discontinuous with regard to the curvature. It had been in operation for almost 20 years. Its steps in the curvature are supposed to limit the system performance. A novel and advanced geometry concept, adopting a method well-known from civil engineering (e.g., for the railroad track design), has been applied to develop an improved design. It relies on clothoid shape sections keeping the track curvatures continuous and, thus, provides a smooth transition between all the elements. The new design presented improves the pellet launching system performance on ASDEX Upgrade and provides knowledge for an advanced design of pellet guiding tubes in future fusion devices.

[Challenges to endoprosthetic reconstruction after tumor resection around the knee : Management of intra- and postoperative complications]. / Herausforderungen in der Tumorendoprothetik des Kniegelenks : Management von intra- und postoperativen Komplikationen.

BACKGROUND: The good functional outcomes of endoprosthetic knee reconstructions combined with modern oncosurgical concepts have resulted in a decreased rate of primary amputations following tumor resection in the region of the knee, thereby improving the quality of life of affected patients. OBJECTIVE: This study aimed to reappraise complications which are more common than in conventional arthroplasties performed for arthritis or trauma due to the complexity of the surgical procedures, the size of the endoprosthetic reconstructions, and neo-/adjuvant therapies. MATERIAL AND METHODS: Possible intra- and postoperative complications and treatment options are presented. RESULTS: Typical intraoperative complications include malalignment (axis, length, rotation) in implant positioning, unplanned soft tissue defects, impaired implant fixation due to poor bone stock, periprosthetic fractures, vessel/nerve injuries, and lesions/defects of the extensor mechanism. The relevant postoperative complication profile is characterized by local recurrences, periprosthetic infections, thromboembolic events, and mechanical failures (loosening, failure of the constraining mechanism). CONCLUSION: Depending on anatomic conditions and the systemic oncological status of the patient, these complications represent tremendous challenges to reconstructive management. Knowledge of the potential problems enables them to be avoided. This requires profound experience in oncosurgery and tumor endoprosthesis revisions.

Incidence of severe critical events in paediatric anaesthesia in the United Kingdom: secondary analysis of the anaesthesia practice in children observational trial (APRICOT study).

The anaesthesia practice in children observational trial of 31,127 patients in 261 European hospitals revealed a high (5.2%) incidence of severe critical events in the peri-operative period and wide variability in practice. A sub-analysis of the UK data was undertaken to investigate differences compared with the non-UK cohort in the incidence and nature of peri-operative severe critical events and to attempt to identify areas for quality improvement. In the UK cohort of 7040 paediatric patients from 43 hospitals, the overall incidence of peri-operative severe critical events was lower than in the non-UK cohort (3.3%, 95%CI: 2.9-3.8 vs. 5.8%, 95%CI: 5.5-6.1, RR 0.57, p < 0.001). There was a lower rate of bronchospasm (RR 0.22, 95%CI: 0.14-0.33; p < 0.001), stridor (RR 0.42, 95%CI: 0.28-0.65; p < 0.001) and cardiovascular instability (RR 0.69, 95%CI: 0.55-0.86; p = 0.001) than in the non-UK cohort. The proportion of sicker patients where less experienced teams were managing care was lower in the UK than in the non-UK cohort (10.4% vs. 20.4% of the ASA physical status 3 and 9% vs. 12.9% of the ASA physical status 4 patients). Differences in work-load between centres did not affect the incidence and outcomes of severe critical events when stratified for age and ASA physical status. The lower incidence of cardiovascular and respiratory complications could be partly attributed to more experienced dedicated paediatric anaesthesia providers managing the higher risk patients in the UK. Areas for quality improvement include: standardisation of serious critical event definitions; increased reporting; development of evidence-based protocols for management of serious critical events; development and rational use of paediatric peri-operative risk assessment scores; implementation of current best practice in provision of competent paediatric anaesthesia services in Europe; development of specific training in the management of severe peri-operative critical events; and implementation of systems for ensuring maintenance of skills.

Airway management in paediatric anaesthesia in Europe-insights from APRICOT (Anaesthesia Practice In Children Observational Trial): a prospective multicentre observational study in 261 hospitals in Europe.

BACKGROUND: Critical respiratory events are common in children in the peri-anaesthetic period and are caused by airway and ventilation management difficulties. We aimed to analyse current European paediatric airway management practices and identify the incidence and potential consequences of difficult airway management. METHODS: We performed a secondary analysis of airway and ventilation management details of the European multicentre observational trial (Anaesthesia PRactice in Children Observational Trial, APRICOT) of children from birth to 15 yr of age. The primary endpoint was the incidence of difficult airway management. Secondary endpoints were the associations between difficult airway management, known pre-existing respiratory risk factors, and the occurrence of critical respiratory events. RESULTS: Details for 31 024 anaesthetic procedures were available for analysis. Three or more tracheal intubation attempts were necessary in 120 children (0.9%) and in 40 children (0.4%) for supraglottic airways insertions. The incidence (95% confidence interval) for failed tracheal intubation and failed supraglottic airway insertions was 8/10 000 (0.08%; 0.03-0.13%) and 8.2/10 000 (0.08%; 0.03-0.14%) children, respectively. Difficulties in securing the airway increased the risk for a critical respiratory event for tracheal tube (2.1; 1.3-3.4) and supraglottic airway (4.3; 1.9-9.9) placement. History of pre-existing respiratory risk factors was significantly associated with critical respiratory events independently of the airway device used. CONCLUSIONS: Airway management practices vary widely across Europe. Multiple airway device insertion attempts and pre-existing respiratory risk factors increase the likelihood of critical respiratory events in children and require further stratification during preoperative assessment and planning. This study highlights areas where education, research, and training may improve perioperative care. CLINICAL TRIAL REGISTRATION: NCT01878760.

Drug safety in paediatric anaesthesia.

Life-threatening drug errors are more common in children than in adults. This is likely to be because of their variations in age and weight, combined with the occasional exposure of most anaesthetists to paediatric patients. Drug administration in anaesthesia is mostly undertaken by a single operator and thus represents a potentially greater risk compared with other areas of medicine. This increased risk is believed to be offset by anaesthetists working with only a limited number of drugs on a very frequent and repetitive basis. However, high rates of errors continue to be reported. Paediatric anaesthesia practice requires individual age- and weight-specific drug dose calculations and is therefore without a 'familiar' or 'usual' dose. The aim of this narrative systematic review of existing recommendations and current evidence of preventive strategies is to identify measures to enhance the safety and quality of drug administration in paediatric anaesthesia. This review collates and grades the evidence of such interventions and recommendations and assesses their feasibility. Most highly effective available measures require low or limited costs and labour. The presented solutions should, therefore, achieve a high level of acceptance and contribute significantly to safety and quality of care in paediatric anaesthesia.

Emergence delirium or pain after anaesthesia--how to distinguish between the two in young children: a retrospective analysis of observational studies.

BACKGROUND: Early postoperative negative behaviour in preschool children after general anaesthesia is a common problem. The distinction between emergence delirium (ED) and pain is difficult, but management differs between the two. The aim of the current analysis was to identify individual observational variables that can be used to diagnose ED and allow distinction from postoperative pain. METHODS: This retrospective analysis of data from three previous prospective observational studies included children undergoing general anaesthesia for elective adeno-tonsillectomy, sub-umbilical surgery, and MRI scanning. Two trained observers simultaneously applied the Face, Legs, Activity, Cry, Consolability Scale; the Children's Hospital Eastern Ontario Pain Scale; the Children's and Infants' Postoperative Pain Scale or the Paediatric Anaesthesia Emergence Delirium (PAED) scale. Data from each domain of the scales were available at awakening and at five, 10, and 15 min after anaesthesia. Each patient was analysed over time, and subsequently, each evaluation was considered as a single event. The descriptive behaviour items overlapping in the assessed scales were identified as dichotomous variable ('true/false') and then were applied for each evaluation. RESULTS: Children (n=512) were assessed for a total of 2048 evaluations. Most children (69%) displayed at least one episode of ED and/or pain. Almost 15% of children demonstrated both ED and pain. Children with ED showed 'no eye contact' and 'no awareness of surroundings'. Children with pain displayed 'abnormal facial expression', 'crying', and 'inconsolability'. CONCLUSIONS: 'No eye contact' and 'no awareness of surroundings' identifies ED. 'Abnormal facial expression', 'crying', and 'inconsolability' indicate acute pain in children in the early postoperative period.

Defining postoperative stability in children with radial polydactyly.

UNLABELLED: There is little fundamental data on paediatric metacarpophalangeal joint instability in radial polydactyly following surgical reconstruction. We evaluated 27 thumbs in a healthy paediatric population (Group A: eight girls and 19 boys with a mean age of 9.7 years (range 2.7-14.2)) and 12 thumbs following Wassel-IV reconstruction (Group B: eight girls and four boys with a mean age at follow-up of 10.6 years (range 2.7-13.2)). Metacarpophalangeal joint radial deviation, ulnar deviation on stress testing, interphalangeal joint and metacarpophalangeal joint alignment on posterior-anterior radiographs were measured and scored according to parameters defining joint instability. The aim of our study was to provide fundamental data on thumb metacarpophalangeal joint mobility patterns and alignment for further postoperative evaluations in children. The average ulnar deviation and radial deviation on stress testing of the healthy (Group A) metacarpophalangeal joints was 25° (10°-45°) and 30° (10°-55°), respectively. In the operated (Group B) thumbs, the ulnar deviation and radial deviation was greater at 35° (10°-55°) and 30° (10°-70°). Ulnar deviation (UD) of the proximal phalanx at the metacarpophalangeal joint on posterior-anterior radiographs was a mean of 10° (range -10°-30°) in Group B; this was significantly greater than in Group A at a mean of 5° (range -5-20°) (p = 0.029). The mean radial alignment of the interphalangeal joint (distal phalanx relative to the proximal phalanx) was significantly higher in Group B (15°) than Group A (0°) (p = 0.221). In the literature on radial polydactyly, cut off values defining metacarpophalangeal joint instability in children range from 5° to 20°. According to our results, high but physiological metacarpophalangeal joint mobility of the thumb needs to be taken into consideration when evaluating children following reconstruction. Ulnar or radial deviation greater than 30°, in combination with the lack of a definite end point on metacarpophalangeal joint stress testing, may be regarded as unstable. Based on our study on healthy paediatric and reconstructed thumbs, comparison of joint stability with the healthy contralateral hand is recommended in order to define pathological instability. LEVEL OF EVIDENCE: II.

[Free Gracilis Flap for Anatomic Reconstruction after Limb-sparing Sarcoma Resection]. / Freie M. gracilis-Lappenplastik zur anatomischen Rekonstruktion nach gliedmaßen-erhaltender Weichteil-Sarkom Resektion.

INTRODUCTION: Limb-sparing surgery is considered as first choice in most patients with soft tissue sarcomas of the extremities. 5-year survival rates after limb soft tissue sarcoma resection have been promising in many specalised interdisciplinary centres. Quality of life as well as extremity function have thus become an integral aspect of the surgical management of soft tissue sarcomas of the extremities. OBJECTIVE: We herein report on our experience in the anatomic reconstruction of the extremities following limb-sparing soft tissue sarcoma resection using microvascular gracilis muscle flap and skin grafts. PATIENTS AND METHODS: Between 2012 and 2014 an anatomic reconstruction of the hand and foot using gracilis muscle flaps following limb-sparing sarcoma resection (leiomyosarcoma N=2, myxofibrosarcoma N=2, clear cell sarcoma N=1, myxoinflammatory fibroblastic sarcoma N=1, granular cell tumour N=1, pleomorphic sarcoma N=1) was performed in N=8 patients (4 females, 4 males), average age: 44 years (23-76 years), average follow-up time 444 days (98-820). RESULTS: In all patients successful defect coverage with unimpaired wound healing was achieved (adjunctive radiotherapy n=4). The tendon of the harvested gracilis muscle was used for anatomic reconstruction of consequently resected essential anatomic structures (extensor retinaculum n=1, flexor/extensor tendons n=4, extensor expansion n=2, tendon reinsertion n=1, proximal interphalangeal joint collateral ligament n=4, dorsal metatarsal ligament n=1). During follow-up neither local recurrence nor metastasis was observed. CONCLUSION: Reconstruction of multidirectional stability as well as restoring biomechanics and kinetics of the hand and foot should be considered during defect coverage and dead space obliteration management after sarcoma resection of the extremities. For reasons of sound options in anatomic extremity reconstruction with minimal donor site morbidity, the gracilis muscle flap excels in the field of limb-sparing sarcoma resection.

Examination of the protective effects of heparin and recombinant tissue plasminogen activator (rtPA) in compromised adipocutaneous free flaps in the rat model using intravital video microscopy.

BACKGROUND: The purpose of this study was to determine whether the focused delivery of heparin or recombinant tissue plasminogen activator (rtPA) by rinsing accords protective effects which increases the survival of free groin flaps following fatal secondary venous stasis. METHODS: Free microvascular groin flaps (n = 40) were transplanted to the necks of adult Sprague-Dawley rats 20 hours before the experiment. The study groups (each n = 10 animals) were: No adjunctive treatment (Group I), Ringer's solution (Group II), heparin solution (100 IU/kg, group III) and rtPA (2 mg/kg, group IV), respectively. The flap vein was then clamped for 35 minutes. Intravital video microscopy was applied and flap viability was assessed 14 days later. RESULTS: Mean flap necrosis was 90% in group I and II, whereas the rate of flap survival was 80% in group III and 60% in group IV, respectively. CONCLUSIONS: Even though clinical and microvascular flap perfusion parameters in both the rtPA-group and heparin group were initially similar, it has been demonstrated here in our investigations that the flaps treated with heparin showed a higher viability rate. Therefore, we can conclude that the focused delivery of heparin and rtPA resulted in a significantly improved flap salvage.

[Optimising care structures for severe hand trauma and replantation and chances of launching a national network]. / Über Versorgungsstrukturen und Möglichkeiten der Optimierung durch Vernetzung bei schweren Handverletzungen und Replantationen.

Severe hand traumata have a significant impact on our health system and on insurance companies, respectively. It is estimated that 33% of all occupational injuries and 9% of all invalidity pensions are due to severe hand trauma. Unfortunately, these high numbers are not only due to the severity of the trauma but to organisational deficiencies. Usually, the patient is treated at the general surgical emergency in the first place and only then forwarded to a microsurgeon. This redirection increases the time that is required for the patient to finally arrive at an expert for hand surgery. On the one hand, this problem can be explained by the population's lack of awareness for distinguished experts for hand and microsurgery, on the other hand, the emergency network, or emergency doctors in particular are not well informed about where to take a patient with a severe hand trauma - clearly a problem of communication between the hospitals and the ambulance. It is possible to tackle this problem, but put participating hand trauma centres have to work hand in hand as a network and thus exploit synergy effects. The French system "FESUM" is a good example for such a network and even comprises centres in Belgium and Switzerland. To improve the treatment of severe hand trauma, a similar alliance was initiated in Germany just recently. The pilot project "Hand Trauma Alliance" (www.handverletzung.com) was started in April 2013 and currently comprises two hospitals within the region of upper Bavaria. The network provides hand trauma replantation service on a 24/7 basis and aims at shortening the way from the accident site to the fully qualified hand surgeon, to improve the therapy of severe hand injuries and to optimise acute patient care in general. In order to further increase the alliance's impact it is intended to extend the project's scope from regional to national coverage - nevertheless, such an endeavour can only be done in collaboration with the German Society for Hand Surgery (DGH). This article comprises 2 parts. First, the state-of-the-art of acute severe hand trauma care is summarised and explained. Subsequently, the above-mentioned pilot project is described in every detail, including positive effects but also barriers that still have to be overcome.