Longitudinal Force Measurement and its Relationship to Technical Competence for Esophageal Anastomosis in a Thoracoscopic Esophageal Atresia/Tracheo-Esophageal Fistula Simulator.

PURPOSE: Thoracoscopic esophageal atresia with tracheo-esophageal fistula (EA/TEF) repair requires the gentle manipulation of delicate tissue. Force sensors were attached to the upper and lower esophagus of a 3D-printed EA/TEF simulator to explore force parameters as markers of performance. METHODS: Participants completed one intracorporeal suture between the anterior walls of upper and lower esophageal ends. Longitudinal force data were recorded at each end. A blinded pediatric surgeon marked attempt videos. Excessive force events, maximum tension, and force interquartile range (IQR) were measured. Data were reported as median (range) significance of p < 0.05. RESULTS: 17 participants of varying levels of experience performed the task. OSATS scores showed significant differences between experts and novices. Experts completed the task in a median time of 4 min. They used lower maximum tension, higher force IQR, and had fewer excess force events compared to the intermediate and novice groups. DISCUSSION: The application of force was dependent on expertise with more skilled participants having fewer excess force events. The higher expert force IQR likely reflects the consistent tension needed for task completion. Analysis of force data may be an indicator of competence, and trainees may benefit from a thoracoscopic simulator which provides force data feedback. LEVEL OF EVIDENCE: Not applicable.

Magnetic resonance quantification of skeletal muscle lipid infiltration in a humanized mouse model of Duchenne muscular dystrophy.

Rodent models of Duchenne muscular dystrophy (DMD) often do not recapitulate the severity of muscle wasting and resultant fibro-fatty infiltration observed in DMD patients. Having recently documented severe muscle wasting and fatty deposition in two preclinical models of muscular dystrophy (Dysferlin-null and mdx mice) through apolipoprotein E (ApoE) gene deletion without and with cholesterol-, triglyceride-rich Western diet supplementation, we sought to determine whether magnetic resonance imaging and spectroscopy (MRI and MRS, respectively) could be used to detect, characterize, and compare lipid deposition in mdx-ApoE knockout with mdx mice in a diet-dependent manner. MRI revealed that both mdx and mdx-ApoE mice exhibited elevated proton relaxation time constants (T2 ) in their lower hindlimbs irrespective of diet, indicating both chronic muscle damage and fatty tissue deposition. The mdx-ApoE mice on a Western diet (mdx-ApoEW ) presented with greatest fatty tissue infiltration in the posterior compartment of the hindlimb compared with other groups, as detected by MRI/MRS. High-resolution magic angle spinning confirmed elevated lipid deposition in the posterior compartments of mdx-ApoEW mice in vivo and ex vivo, respectively. In conclusion, the mdx-ApoEW model recapitulates some of the extreme fatty tissue deposition observed clinically in DMD muscle but typically absent in mdx mice. This preclinical model will help facilitate the development of new imaging modalities directly relevant to the image contrast generated in DMD, and help to refine MR-based biomarkers and their relationship to tissue structure and disease progression.

Learning and teaching stage 4 clinical decision making: progression from novice to expert.

BACKGROUND: This paper describes the development of learning from novice to expert in Stage 4: Clinical Decision Making (CDM) in surgery: Postoperative reflection and review. It also outlines some or the assessment and teaching approaches suitable to facilitate that transition in skill level. METHODS: This paper is drawn from a much broader study of learning and teaching CDM, that used qualitative methodology based on Constructivist and Grounded Theory. Data was collected in individual interviews and focus groups. Using thematic analysis the data were analysed to identify key ideas. All participants worked in the Department of Surgery at one large regional hospital in Victoria. RESULTS: For each stage there is a sequence of learning beginning from relying on external resources, gradually developing internal resources to guide and direct the learner's CDM. Those internal resources built through experience include multisensory and kinaesthetic memories that expand to facilitate the ability to cope with complexity. DISCUSSION: Armed with the mind-map and rubric table included in this paper it should be possible for any senior clinician or teacher to diagnose their trainees' progression in Stage 4 CDM. This will enable them to tailor their teaching to best match the capabilities of the trainee and to enable to be more effectively targeted. CONCLUSION: CDM can be taught and both trainees and senior clinicians can benefit from understanding the processes involved.

The role of motion tracking in assessing technical skill acquisition using a neonatal 3D-printed thoracoscopic esophageal atresia/tracheo-esophageal fistula simulator.

INTRODUCTION: Acquiring the technical skills required for thoracoscopic repair of esophageal atresia with tracheo-esophageal fistula (EA/TEF) is challenging. A high-fidelity 3D-printed pediatric thoracoscopic EA/TEF simulator has been developed to address this issue. This study explored motion-tracking as an assessment tool to distinguish between surgeons of different expertise using the simulator. METHODS: Participants performed a single intracorporeal suture between the esophageal ends in EA with TEF. Total relative path lengths of the right and left surgical instruments were recorded during the task. Each video-recorded attempt was assessed by a blinded pediatric surgeon using a modified Objective Structured Assessment of Technical Skills (OSATS) score. Data recorded as median (range) and statistical significance as p<0.05. RESULTS: The task was performed by 17 participants. The median OSATS scores identified a significant difference between experts and novices. A difference between left- and right-hands was only found in the mid-skill level group. Right-hand path length was greatest in novices and lowest in experts. Left-hand path length was greatest in novices and the mid-skill level group compared to experts. CONCLUSION: Experts had the lowest total path length for either hand, suggesting they had the greatest efficiency of movement. The similar high path lengths in both hands for novices indicate their relatively low level of skill with either hand. The difference between right- and left-hand path lengths in the mid-skill level group likely reflects the improved right-handed technical skills in contrast to the still developing left hand. Further focus on the left hand during simulation training may improve left-handed economy of movement.

Access to emergency paediatric surgery for testicular torsion or intestinal volvulus in New Zealand: A system perspective.

AIM: The risk of organ loss is increased in children with testicular torsion or intestinal volvulus if surgical management is not expedient. The current retrospective study aims to review the time-course from first symptom to 'knife to skin' in these conditions, to determine where delays occur and facilitate a systems approach to better manage these children. METHODS: One hundred consecutive paediatric cases of scrotal exploration for presumed testicular torsion, and 100 neonatal cases presenting with possible malrotation/volvulus were analysed to evaluate the exact time-course of events from admission to surgery. RESULTS: (i) Scrotal exploration: the median time from onset of symptoms to presentation was 12 h (interquartile range (IQR): 5-48 h). In children over 5 years of age, 36% (33/93) were transferred from an external district service area. (ii) Malrotation/volvulus: the median duration of symptoms prior to arrival/assessment was 12 h (IQR: 4-24 h). The median cumulative in-hospital time was over 6 h (368 min, IQR: 247-634 min). CONCLUSIONS: Time to presentation contributes significantly to testicular ischaemic time. This delay to timely surgical intervention is multi-factorial, and must be addressed at a public health level. Support and training in the management of testicular torsion should be provided to all adult surgeons/trainees that may care for these children. In general, this condition is best managed at the presenting hospital whenever appropriate expertise is available. Novel pathways that streamline care may improve efficiency at an institutional level. Addressing issues of access to specialised neonatal surgery is more vexed on account of the tyranny of distance, and the pre-requisite level of surgical expertise required.

How electronically available referral guidelines for primary medical practitioners can improve the timeliness of orchidopexy.

AIM: This study determined whether easily used guidelines and an electronic referral process could decrease the age of referral of suspected undescended testes (UDT). An online resource for primary medical practitioners was introduced for which the UDT guideline advises referral to paediatric surgery for testes not sitting spontaneously in the scrotum at three-months corrected age. METHOD: Data were collected prospectively for boys referred with UDT over a seven-year period (2012-2018), during which time agreed GP guidelines on the Community HealthPathways website for referral were introduced. Trends in the age at referral and age at orchidopexy were analysed. RESULTS: Complete data were obtained for 212 boys. Referral before age six months increased from 13% to 61%, and before 12 months from 48% to 78%. Orchidopexy by 12 months increased from 16% to 39%, and by 18 months from 48% to 74%, during the same period. Median age at orchidopexy for this 2012-2018 cohort was 21.6 months compared with 31.1 months from 1997-2007. DISCUSSION: These data demonstrate earlier referral of boys with UDT and earlier orchidopexy corresponded to the introduction of the GP Community HealthPathways website. A similar resource available in other regions or countries also might be expected to reduce the age of referral of suspected UDT from primary care providers.

Is Technical Expertise Necessary to Assess Technical Expertise? Let's Ask the Kids.

Background: Simulation has an increasing role in surgical training; however, using validated tools such as the Objective Structured Assessment of Technical Skills (OSATS) is time-consuming, which may be a potential barrier to simulation-based training. This study tests the hypothesis that assessors with technical expertise are necessary to objectively score a technical task. Methods: Three tasks, ring transfer, needle pass, and atresia cut, were performed using a synthetic thoracoscopic simulator for esophageal atresia/tracheoesophageal fistula. Three pediatric surgeons, 6 novice adults, and 3 children aged 9-13 years scored each attempt using the overall global OSATS rating from 1 to 5 (1 "repeated or awkward movements" to 5 "fluid movement. No awkwardness"). Results: For the ring transfer, all assessors scored novice participants significantly less than expert and intermediate scores (surgeon P = .0004, nonsurgeon adults P = .0009 and children P = .0003). For the needle pass, all assessors gave significantly different scores between novices and experts (surgeon P = .0007, nonsurgeon adult P = .0008, and children P = .0040). For the atresia cut, surgeon assessors gave significantly higher scores for experts and intermediate and novice (P = .0004). Nonsurgeon assessors gave experts and intermediates significantly higher scores than novices (P = .0001). Surgeon assessors achieved good reliability for ring transfer (0.8252) and needle pass (0.7769) compared with nonsurgeon assessors who showed poor reliability for the ring transfer (0.3959) and moderate for the needle pass (0.6551). Conclusions: Expertise in performing these procedures is not a prerequisite for an assessor to evaluate the technical skill, hence assessors of skill acquisition can be nonexpert, a nonsurgeon, or even a child. The variability in all groups suggests that reliability overall is increased with multiple assessors. Although nonsurgeon assessors may be appropriate for formative assessments, they lack the reliability to provide assessment of competence for high stakes complex tasks. Summative assessment will likely require at least 1 surgeon/expert assessor to provide reliability.

The influence of experience and expertise on how surgeons prepare to perform a procedure.

BACKGROUND: There is a paucity of literature describing how surgeons (either novice or expert) mentally prepare to carry out a surgical procedure. This paper focuses on these processes, and is part of a larger piece of research based on the Royal Australasian College of Surgeons (RACS) Clinical Decision Making model. METHODS: Interviews were conducted over a 3-year period with registrars, trainees, fellows and consultants in the Department of Surgery at one large regional hospital in Victoria. Analysis began from the first interview with no pre-conceived codes. Emerging themes were drawn from participants' interpretation of their experiences. Further information was obtained during discussions in theatre while patients were being prepared for surgery. RESULTS: The findings show that the process of rehearsal changes as a surgeon gains more experience in a procedure. A 'novice' relies on external sources of information, for example textbooks and videos. After participating in a number of similar procedures their reliance gradually moves to their own sensory memories. Surgeons at all levels of experience discuss their preparations with peers, colleagues, senior clinicians, and where appropriate, with members of other disciplines. CONCLUSION: These findings offer insight into how surgeons, at different levels of experience, prepare for a procedure. These understandings have the potential to improve the teaching and learning of this essential component of surgical practice.

Construct validation of a 3D printed neonatal thoracoscopic simulator: Can it measure expertise?

BACKGROUND: acquiring technical expertise for neonatal thoracoscopy is challenging. To address this, we designed a fully synthetic thoracoscopic simulator for which we established its construct validity. METHODS: three thoracoscopic tasks were assessed: ring transfer, needle pass and incision of a blind upper esophageal pouch (EA cut). Participants watched instructional videos with accompanying written instructions for each task before having their attempt video recorded. All tasks were marked by three blinded pediatric surgeons using a modified Objective Structured Assessment of Technical Skills (OSATS). Scores were assessed using appropriate statistical analysis and inter-rater reliability was analyzed by interclass correlation coefficient (ICC). RESULTS: 23 participants completed the ring transfer and needle pass and 21 the EA cut: 5 experts (consultant surgeons), 5 intermediate (registrars on a training program) and 13 novices (medical students, house surgeons or non-training registrars). All three tasks distinguished between novice and intermediate/expert (ring transfer p = 0.00001, needle pass p = 0.0004 and EA cut p = 0.0014, respectively). Interrater reliability was good for ring transfer and needle pass but poor for EA cut. CONCLUSION: the tasks distinguished between novice and intermediate/expert but not between expert and intermediate. In needle pass and EA cut, there was a trend for the experts to score higher than intermediate participants. Ring transfer and needle pass tasks achieved construct validity, had good interrater reliability and were found to be useful in assessing a novice surgeon's progression towards the intermediate level. Distinguishing between intermediate and expert may require assessment of more complex tasks such as intracorporeal suturing and tying. LEVEL OF EVIDENCE: II.

The frequency and effects of distractions in operating theatres.

BACKGROUND: Operating theatres (OTs) are complex environments where team members complete difficult tasks under stress. Distractions in these environments can lead to errors that compromise patient safety. A range of potential distractions exist in OTs and previous research suggests they are common. This study assesses the nature, frequency and impact of distracting events in the OT at a tertiary New Zealand hospital. METHODS: Prospective observational study of the frequency, type and impact of OT distractions during a 3-month period. Two observational methods - the frequency of door openings and a validated tool - were used to categorize OT distractions for a range of acute and elective, paediatric and adult surgical procedures according to their cause and effect. RESULTS: There were 57 procedures (2037 intraoperative minutes) observed. During this time, 721 door openings and 1152 other distracting events were recorded. On average, either a door opening or other distracting event was recorded 56 times per hour of intraoperative time. The frequency of distractions did not vary in relation to acute versus elective or paediatric versus adult procedures but were more common in the morning. Communication unrelated to the case was the most common distracting event: these and equipment issues had the greatest effect on the entire surgical team, usually by causing some interruption to operative flow. CONCLUSION: Distractions in OTs were common, occurring nearly every minute. Most were trivial, but some had the potential to disrupt the operative procedure and result in patient harm. Reducing distractions in surgery could reduce patient harm and improve resource use.

Out of tragedy can emerge the finest human qualities.

In March 2019 the Pacific Association of Pediatric Surgeons held its annual conference in Christchurch, New Zealand, a normally peaceful city that was in the process of rebuilding following the devastating earthquakes of 2010 and 2011. Then the day after the conference concluded a horrendous atrocity was committed in two nearby mosques which presented the hospital with 25 years of major gunshot injuries in just one hour. The remarkable response of the hospital and its staff, the victims and the broader community are outlined. Although the surgical response was impressive, lessons could still be learnt. These related to the consequences of the lack of warning as the ED was flooded with casualties, the effects of scoop and run when a disaster occurs near a hospital, limitations around record keeping, the rapid arrival of expert support into ED, pre-empting pressure points, designation of two key destinations and avoiding patient return to ED after imaging, the importance of flexibility and collaboration between services, the consequences on normal hospital activity in the weeks following the incident and the behaviour of victims. The response of PAPS to the event was no less impressive: consistent with its longstanding commitment to the care and welfare of children around the globe, our organisation, donated over $40,000 through the Christchurch Foundation towards scholarships for the children of the victims to support their higher education. Out of tragedy can emerge the finest human qualities.

Academic paediatric surgery in Australia and New Zealand: Its governance, drivers, successes and challenges.

Traditionally, academic surgeons have been expected to excel in research, administration, teaching and clinical work. For many, to be strong in all of these areas is aspirational rather than a reality - and it may not always be a desirable expectation. It is more likely that future academic surgeons will have exceptional ability in several of these domains, but probably not all. Clinical expertise (even if it is within a narrow field) is critical to gaining credibility with non-academic surgical colleagues; and research leadership and substantial ongoing academic output is critical to maintaining credibility among academic surgical colleagues - and facilitates funding success. The Board of Paediatric Surgery is the specialty training board of the Royal Australasian College of Surgeons (RACS) that is responsible for the training program in paediatric surgery for both Australia and New Zealand. "Scholarship and teaching" is designated as being one of the nine competencies RACS expects of all surgeons. Expertise in the domain of scholarship (and research) occurs at two levels: (1) A working knowledge of scientific method, having a critical and curious mind matched with an ability to formulate a research question and contribute to research studies, and an ability to analyse research data and to use it to inform clinical practice. This is expected of all surgeons; and (2) A career academic surgeon with a formal commitment to research which becomes a major component of their work, with the requisite expertise in scientific method to be able to design, set up and complete research studies. The RACS provides support for academia in surgery to flourish in multiple ways and at various stages in the surgeons' career, as described in this chapter. Increasingly, the academic surgeon has to forge links and to collaborate with other research groups. At least in Australia and New Zealand, departments should work to ensure that their academic surgeons are not excessively burdened with departmental leadership and governance roles that do not require specific academic expertise. Arguably, future academic paediatric surgeons will expect to have a better balance in their lives than some of their predecessors!

Why Women Might Choose a Career in Pediatric Surgery and Ensuring There Are No Impediments to Selecting the Best.

INTRODUCTION: Although pediatric surgery in Australasia has a higher proportion of women than any other surgical specialty, women remain underrepresented. There is concern that residual impediments may still deter women from choosing this specialty as a career option. MATERIALS AND METHODS: A survey of years 2 to 6 medical students, with focused analysis on those who selected pediatric surgery as their most (or least) attractive surgical specialty and the characteristics they deemed important when considering a surgical career. RESULTS: The survey was completed by 357 students of whom 50 selected pediatric surgery as their most attractive surgical specialty and 12 as their least attractive surgical specialty, at equal gender rates. The specialty was not perceived as being prestigious, well paid, or one that emphasized technical skill but was perceived as having good work-life balance, when compared with the other surgical specialties. Those who selected pediatric surgery as their most attractive specialty were otherwise less likely to choose a career in surgery. CONCLUSION: Pediatric surgery is perceived as being less aligned to characteristics stereotypically associated with males and more with those characteristics associated with females. Overall, it seems to be more female friendly than other surgical specialties. It would behove the pediatric surgical community to better understand how it is perceived, so that perceptions can be aligned to reality and gender diversity can be increased.

Master and Apprentice or a Slave to Technology? A Randomized Controlled Trial of Minimal Access Surgery Simulation-Based Training Techniques.

Introduction: This study set out to assess the efficacy of three different approaches to simulation-based minimal access surgery (MAS) training using a three-dimensional printed neonatal thoracoscopic simulator and a virtual simulator. Materials and Methods: Randomized controlled trial of medical students (N = 32), as novices to MAS. The participants performed two construct validated tasks on a thoracoscopic simulator and were then randomly allocated into four intervention groups: (1) three consultant-led sessions on a thoracoscopic simulator; (2) three self-directed learning sessions on the same simulator; (3) self-directed "virtual training" on the "SimuSurg" application; and (4) control. Postintervention participants repeated both tasks. Videos of all task attempts were de-identified and marked by a blinded consultant pediatric surgeon. Results: There were no statistically significant differences in baseline objective structured assessment of technical skills (OSATS) scores or demographics in any group. For the "ring transfer" task, Groups 1 and 2 showed significant improvement after intervention, with no significant change in Groups 3 or 4. There was no significant difference between Groups 1 or 2 in postintervention scores. For the "needle pass" task, no group demonstrated a statistically significant improvement after intervention. Conclusion: Practice on a physical simulator either consultant-led or self-directed led to improved scores for MAS novices compared with a virtual simulator or no intervention for a simple "ring transfer" task. This suggests that time on the physical simulator was the most important factor and implies that trainees could usefully practice simple tasks at their convenience rather than require consultant supervision. This improvement is not seen in more challenging tasks such as the "needle pass."

Contemporary management of Hirschsprung disease in New Zealand.

BACKGROUND: The aim of this study was to report the contemporary management of Hirschsprung disease (HD) in New Zealand. METHODS: We undertook a national multi-centre retrospective review of all newly diagnosed cases of HD during a 16-year period (2000-2015). Demographics, genetic and syndromic associations, family history, radiology and histology results and surgical interventions were analysed. RESULTS: A total of 246 cases (males:females 4:1) were identified, an incidence of 1:3870 live births. Short-segment disease was present in 81.7%, long-segment disease in 8.5%, total colonic aganglionosis in 6.5% and unknown in 3.3%. HD was diagnosed by 4 weeks' corrected gestational age in 67%. Thirty cases (12%) also had Trisomy 21. Fifty-three (21.5%) patients required a repeat rectal biopsy for definitive diagnosis. A contrast enema was performed in 55% and identified the transition zone with 69% accuracy. Primary pull-through surgery was undertaken in 59% (65% of short-segment cases) at a median age of 27 days; others were initially managed by a defunctioning stoma. The commonest definitive procedure was a Soave-Boley endorectal pull-through (79%) (or similar variant). During a median follow-up of 7.4 years, six (2.5%) survivors underwent a redo pull-through, 13 (5.5%) an appendicostomy, 16 (6.8%) a defunctioning stoma and 10 never had a definitive procedure. Total colonic aganglionosis was significantly more likely to be fatal (12.5% versus 0.5%, P < 0.0005) or associated with a permanent end stoma (27.5% versus 4.5%, P < 0.0005). CONCLUSIONS: Most New Zealand born infants with short-segment HD are currently managed by primary pull-through, usually in the first months of life.

End-User Input into the Design and Validation of a Synthetic Thoracoscopic Esophageal Atresia/Tracheo-Esophageal Fistula Simulator.

Introduction: Thoracoscopic repair of esophageal atresia and tracheo-esophageal fistula (EA/TEF) is challenging. We addressed this by designing a fully synthetic simulator of the procedure and described the design process and how its content validity was assessed. Methods: An iterative design and assessment of content validity was undertaken in three stages. Data were collected from participants who trialed the model and completed a survey of their experience (adapted from Barsness et al.). Results: The model was trialed by participants of varying experience. Each design refinement improved the model's fidelity and validity. For the last iteration of the simulator, the observed averages (out of a maximum of 5) were: value as a training tool 4.8, relevance 4.6, physical attributes 4.5, realism of material 4.25, realism experience 4.17, and ability to perform tasks 3.77. Conclusion: An iterative design process based on end-user feedback has led to a synthetic simulator that has achieved a high level of content validity. This model has advantages over other EA/TEF simulators in that it is relatively inexpensive and does not use animal tissue, thus removing ethical and procurement issues. It was rated highly for its value and relevance to training.

Development of an instrumented thoracoscopic surgical trainer for objective evaluation of esophageal atresia/tracheoesophageal fistula repair.

Operative repair of complex conditions such as esophageal atresia and tracheoesophageal fistula (EA/TEF) is technically demanding, but few training opportunities exist outside the operating theater for surgeons to attain these skills. Learning them during surgery on actual neonates where the stakes are high, margins for error narrow, and where outcomes are influenced by technical expertise, is problematic. There is an increasing demand for high-fidelity simulation that can objectively measure performance. We developed such a simulator to measure force and motion reliably, allowing quantitative feedback of technical skill. A 3D-printed simulator for thoracoscopic repair of EA/TEF was instrumented with motion and force tracking components. A 3D mouse, inertial measurement unit (IMU), and optical sensor that captured force and motion data in four degrees of freedom (DOF) were calibrated and verified for accuracy. The 3D mouse had low average relative errors of 2.81%, 3.15%, and 6.15% for 0 mm, 10 mm offset in Y, and 10 mm offset in X, respectively. This increased to - 23.5% at an offset of 42 mm. The optical sensors and IMU displayed high precision and accuracy with low SDs and average relative errors, respectively. These parameters can be a useful measurement of performance for thoracoscopic EA/TEF simulation prior to surgery. Graphical abstract Inclusion of sensors into a high-fidelity simulator design can produce quantitative feedback which can be used to objectively asses performance of a technically difficult procedure. As a result, more surgical training can be done prior to operating on actual patients in the operating theater.