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Developing a simulation programme to train airway management during the COVID-19 pandemic in a tertiary-level hospital. 在一家三级医院开发模拟程序,培训 COVID-19 大流行期间的气道管理。
IF 1.1 Q2 Social Sciences Pub Date : 2021-07-01 Epub Date: 2021-06-21 DOI: 10.1136/bmjstel-2020-000755
Heung Yan Wong, Craig Johnstone, Gunjeet Dua

Tracheal intubation of a patient with COVID-19 is a high-risk procedure for not only the patient, but all healthcare workers involved, leading to an understandable degree of staff anxiety. We used simulation to help train airway managers to intubate patients with COVID-19. Based on action cards developed by our department, we designed a series of scenarios to simulate airway management during the COVID-19 pandemic. Teams were asked to perform a rapid sequence induction with tracheal intubation. We designed in situ scenarios with low-fidelity manikins that could be set up in operating theatres across multiple sites. Over a period of 4 weeks, 101 consultant anaesthetists, 58 anaesthetic trainees and 30 operating department practitioners received intubation training. These members made up the airway response team of our hospital. 30 emergency department doctors also received training in anticipation of further COVID-19 surges leading to the possibility of overwhelmed services. Simulation-based training was an invaluable tool for our hospital to rapidly upskill medical professionals during the first wave of the COVID-19 pandemic. We have used feedback and additional guidelines to improve our scenarios to retrain staff during subsequent waves.

对 COVID-19 患者进行气管插管不仅对患者,而且对所有相关医护人员来说都是一个高风险的过程,因此工作人员的焦虑是可以理解的。我们利用模拟技术帮助培训气道管理人员为 COVID-19 患者插管。根据我们部门开发的行动卡,我们设计了一系列情景,模拟 COVID-19 大流行期间的气道管理。我们要求各小组执行气管插管的快速顺序诱导。我们使用低仿真人体模型设计了原位情景,可在多个地点的手术室中设置。在为期 4 周的时间里,101 名麻醉顾问、58 名麻醉实习生和 30 名手术部从业人员接受了插管培训。这些成员组成了本医院的气道反应小组。30 名急诊科医生也接受了培训,以应对 COVID-19 进一步激增导致服务不堪重负的可能性。模拟培训是我们医院在 COVID-19 第一波大流行期间迅速提高医疗专业人员技能的宝贵工具。我们利用反馈意见和补充指南来改进我们的情景模拟,以便在随后的大流行中对员工进行再培训。
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引用次数: 0
Influence of Simulation-based Training on Reflective Practice. 模拟训练对反思性实践的影响。
IF 1.1 Q2 Social Sciences Pub Date : 2021-07-01 Epub Date: 2021-07-26 DOI: 10.1136/bmjstel-2021-000870
John A Aitken, Elisa M Torres, Seth A Kaplan, Deborah DiazGranados, Lillian Su, Sarah Henrickson Parker

Background: Simulation-based training (SBT) is often evaluated based on the transfer of specific knowledge and skills. In contrast, the degree to which reflective practice is inculcated by SBT is rarely considered. Because reflection is a pillar of adult learning theories, we sought to examine the degree to which participation in SBT was associated with increased reflective practice.

Method: Eighty one healthcare professionals completed a survey which included the number of SBTs they participated in during the past two years, content- and administrative-related features of those SBTs, and a key aspect of reflective practice (i.e., self-appraisal).

Results: The number of SBTs healthcare professionals participated in during the past two years was positively associated with reflective self-appraisal. This relationship was not moderated by the inclusion of reflection components in SBTs nor by the voluntary/mandatory nature of participation in SBTs. Furthermore, the facilitator was ranked as the most important feature of the overall learning experience in SBTs. Also, no significant differences were found between the number of technical skills-based and non-technical skills-based SBTs.

Conclusion: These findings demonstrate the importance (of evaluating) SBTs for facilitating reflective learning mindsets that healthcare practitioners can apply beyond the specific skills trained by SBTs.

背景:模拟培训(SBT)通常根据特定知识和技能的传授情况进行评估。与此相反,人们很少考虑 SBT 在多大程度上灌输了反思性实践。由于反思是成人学习理论的支柱,因此我们试图研究参与 SBT 与反思性实践增加的关联程度:方法:81 名医疗保健专业人员完成了一项调查,内容包括他们在过去两年中参加的 SBT 的数量、这些 SBT 的内容和管理相关特征,以及反思性实践的一个关键方面(即自我评价):结果:医护人员在过去两年中参与的 SBT 数量与反思性自我评估呈正相关。这种关系并不因 SBT 是否包含反思内容或参与 SBT 的自愿/强制性质而调节。此外,在 SBTs 的整体学习体验中,主持人被列为最重要的特征。此外,基于技术技能的 SBT 和非基于技术技能的 SBT 在数量上没有明显差异:这些研究结果表明,SBT(评估)对于促进反思性学习心态非常重要,医护人员可以将其应用到 SBT 培训的特定技能之外。
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引用次数: 0
Interprofessional teamwork for managing medical deterioration in pregnancy: what contributes to good clinical performance in simulated practice? 跨专业团队合作处理妊娠期病情恶化:模拟实践中良好的临床表现源于什么?
IF 1.1 Q2 Social Sciences Pub Date : 2021-07-01 Epub Date: 2021-04-19 DOI: 10.1136/bmjstel-2020-000700
Mary Lavelle, Gabriel B Reedy, Thomas Simpson, Anita Banerjee, Janet E Anderson

Objectives: To identify the patterns of teamwork displayed by interprofessional teams during simulated management of medical deterioration in pregnancy and examine whether and how they are related to clinical performance in simulated practice.

Design: Exploratory observational cohort study.

Setting: Interprofessional clinical simulation training with scenarios involving the management of medical deterioration in pregnant women.

Participants: Seventeen simulated scenarios involving 62 qualified healthcare staff working within the National Health Service attending clinical simulation training (midwives (n=18), obstetricians (n=24) and medical physicians (n=20)).

Main outcome measures: Teamwork behaviours over time, obtained through detailed observational analysis of recorded scenarios, using the Temporal Observational Analysis of Teamwork (TOAsT) framework. Clinician rated measures of simulated clinical performance.

Results: Scenarios with better simulated clinical performance were characterised by shared leadership between obstetricians and midwives at the start of the scenario, with obstetricians delegating less and midwives disseminating rationale, while both engaged in more information gathering behaviour. Towards the end of the scenario, better simulated clinical performance was associated with dissemination of rationale to the team. More delegation at the start of a scenario was associated with less spontaneous sharing of information and rationale later in the scenario. Teams that shared their thinking at the start of a scenario continued to do so over time.

Conclusions: Teamwork during the opening moments of a clinical situation is critical for simulated clinical performance in the interprofessional management of medical deterioration in pregnancy. Shared leadership and the early development of the shared mental model are associated with better outcomes.

目的确定跨专业团队在模拟处理妊娠期医疗恶化过程中表现出的团队合作模式,并研究这些模式是否以及如何与模拟实践中的临床表现相关:设计:探索性观察队列研究:环境:跨专业临床模拟培训,模拟情景涉及孕妇病情恶化的处理:17个模拟场景,涉及62名参加临床模拟培训的国家卫生服务部门合格医护人员(助产士(18人)、产科医生(24人)和内科医生(20人)):团队合作行为随时间的变化,采用团队合作时间观察分析(TOAsT)框架,通过对记录的情景进行详细的观察分析获得。临床医生对模拟临床表现进行评分:结果:模拟临床表现较好的情景在情景开始时由产科医生和助产士共同领导,产科医生较少授权,而助产士则传播原理,同时双方都有较多的信息收集行为。在情景模拟接近尾声时,更好的模拟临床表现与向团队传播基本原理有关。情景模拟开始时更多的授权与情景模拟后期较少自发分享信息和原理有关。在情景模拟开始时交流思想的团队随着时间的推移会继续这样做:结论:临床情景开始时的团队合作对于模拟妊娠期内科病情恶化跨专业管理的临床表现至关重要。共同领导和共同心理模型的早期发展与更好的结果相关。
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引用次数: 0
Virtual tabletop simulations for primary care pandemic preparedness and response. 初级保健大流行防范和应对的虚拟桌面模拟。
IF 1.1 Q2 Social Sciences Pub Date : 2021-07-01 Epub Date: 2021-04-13 DOI: 10.1136/bmjstel-2020-000854
Marlot Johanna Blaak, Raad Fadaak, Jan M Davies, Nicole Pinto, John Conly, Myles Leslie

Introduction: The COVID-19 pandemic prompted widescale use of clinical simulations to improve procedures and practices. We outline our deployment of a virtual tabletop simulation (TTS) method in primary care (PC) clinics across Alberta, Canada. We summarise the quality and safety improvements from this method and report end users' perspectives on key elements.

Methods: Our virtual TTS used teleconferencing software alongside digital whiteboards to walk clinic stakeholders through patient scenarios. Participants reviewed and rehearsed their workflows and care practices. The goal was for staff to take ownership over gaps and codesigned solutions. After simulation sessions, follow-up interviews were conducted to collect feedback.

Results: These sessions helped PC staff identify and codesign solutions for clinical hazards and threats. These included the flow of patients through clinics, communications, redesignation of physical spaces, and adaptation of guidance for cleaning and personal protective equipment use. End users reported sessions provided neutral spaces to discuss practice changes and built confidence in delivering safe care during the pandemic.

Discussion: TTS has not been extensively deployed to improve clinical practice in outpatient environments. We show how virtual TTS can bridge gaps between knowledge and practice by offering a guided space to rehearse clinical changes. We show that virtual TTS can be used in multiple contexts to help identify hazards, improve safety and build confidence in professional teams adapting to rapid changes in both policies and practices. While our sessions were conducted in Alberta, our results suggest this method may be deployed in other contexts, including low-resource settings.

导语:COVID-19大流行促使广泛使用临床模拟来改进程序和实践。我们概述了我们在阿尔伯塔省初级保健(PC)诊所部署的虚拟桌面模拟(TTS)方法,加拿大。我们总结了这种方法在质量和安全方面的改进,并报告了最终用户对关键要素的看法。方法:我们的虚拟TTS使用远程会议软件和数字白板来引导诊所利益相关者通过患者场景。参与者回顾并排练了他们的工作流程和护理实践。目标是让员工对差距和共同设计的解决方案承担责任。模拟会议结束后,进行后续访谈以收集反馈。结果:这些会议帮助PC员工识别和共同设计临床危害和威胁的解决方案。这些措施包括患者通过诊所的流动、通信、物理空间的重新指定,以及对清洁和个人防护装备使用的指导进行调整。最终用户报告说,会议为讨论做法变化提供了中立空间,并建立了在大流行期间提供安全护理的信心。讨论:TTS尚未广泛应用于改善门诊环境的临床实践。我们展示了虚拟TTS如何通过提供一个指导空间来排练临床变化,从而弥合知识和实践之间的差距。我们表明,虚拟TTS可以在多种情况下使用,以帮助识别危险、提高安全性并建立专业团队的信心,以适应政策和实践的快速变化。虽然我们的课程是在艾伯塔省进行的,但我们的结果表明,这种方法可以应用于其他环境,包括低资源环境。
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引用次数: 6
Immersive technology in ophthalmology education: a systematic review. 沉浸式技术在眼科教育中的应用:系统综述。
IF 1.1 Q2 Social Sciences Pub Date : 2021-06-29 eCollection Date: 2021-01-01 DOI: 10.1136/bmjstel-2021-000906
Shakeel Lowe, Kathryn Mares, Zarnie Khadjesari

Background: Despite the increasing use of immersive technology (IT) in ophthalmology, the effectiveness of this approach compared to other teaching practices is unclear. This systematic review aimed to determine the value of IT to teach students ophthalmic skills and whether it can supplement or replace conventional teaching practices.

Methods: A systematic search was performed of CENTRAL, MEDLINE, EMBASE, ERIC and PsychINFO databases. Randomised controlled trials comparing IT interventions versus (1) no training, (2) standard training, (3) different types of IT interventions, (4) different doses of IT interventions were eligible for inclusion.

Results: Seven trials involving 177 participants were included. IT offered some benefit compared to standard training as most trials demonstrated evidence of learning represented by composite performance score and performance time. Repetitive training with IT displayed similar results.

Conclusion: IT appears to improve the ophthalmic skill of healthcare trainees and should be considered as a supplement to training.

背景:尽管沉浸式技术(IT)在眼科中的使用越来越多,但与其他教学方法相比,这种方法的有效性尚不明确。本系统性综述旨在确定信息技术在教授学生眼科技能方面的价值,以及它是否能补充或取代传统的教学方法:方法:对 CENTRAL、MEDLINE、EMBASE、ERIC 和 PsychINFO 数据库进行了系统检索。将信息技术干预与(1)无培训、(2)标准培训、(3)不同类型的信息技术干预、(4)不同剂量的信息技术干预进行比较的随机对照试验符合纳入条件:结果:共纳入了 7 项试验,涉及 177 名参与者。与标准训练相比,信息技术能带来一些益处,因为大多数试验都证明了学习效果,具体表现为综合表现得分和表现时间。使用信息技术进行重复训练也显示出类似的结果:结论:信息技术似乎可以提高医护学员的眼科技能,应被视为培训的补充。
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引用次数: 0
Age suit simulation replicates in healthy young adults the functional challenges to balance experienced by older adults: an observational study 年龄模拟在健康年轻人中复制了老年人所经历的平衡功能挑战:一项观察性研究
IF 1.1 Q2 Social Sciences Pub Date : 2021-06-29 DOI: 10.1136/bmjstel-2021-000867
Carole Anne Watkins, E. Higham, M. Gilfoyle, C. Townley, Sue Hunter
Background Age simulation can have a positive effect on empathic understanding and perception of ageing. However, there is limited evidence for its ability to replicate objectively the physical and functional challenges of ageing. Objective To observe whether age suit simulation can replicate in healthy young adults the physical and physiological balance disturbance and falls risk experienced by older adults. Methodology Healthy young adults aged 20–40 years (16 male) were recruited to the study using convenience sampling from a student population. Participants performed three validated balance tests—Functional Reach Test (FRT), Timed Up and Go (TUG) and Berg Balance Scale (BBS)—first without the age suit and then with the age suit, using a standardised protocol, following the same sequence. Results 30 participants completed all tests. Statistically significant differences between without-age-suit and with-age-suit performance were recorded for FRT distance (p<0.000005), time taken to complete the TUG (p<0.0005) and BBS score (p<0.001). A comparison of participant scores with normative FRT and TUG scores identified that the suit had ‘aged’ the majority of participants to the normative values for older adults (60+), with some reaching the values for individuals aged 70–89. However, no scores achieved the values indicative of increased falls risk. Conclusions The age suit is a valid educational tool that extends the value of age simulation beyond a more general empathising role, enabling those working with an older population to experience and understand the functional challenges to balance experienced by older adults as part of their training.
年龄模拟可以对共情理解和衰老感知产生积极影响。然而,有有限的证据表明,它能够客观地复制衰老带来的身体和功能挑战。目的观察适龄模拟能否在健康青壮年身上复制老年人身体生理平衡紊乱和跌倒风险。方法采用方便抽样的方法从学生人群中招募20-40岁的健康年轻人(16名男性)参加研究。参与者进行了三次有效的平衡测试——功能伸展测试(FRT)、计时起跑(TUG)和伯格平衡量表(BBS)——首先不穿年龄服,然后穿年龄服,使用标准化的协议,遵循相同的顺序。结果30名参与者完成了所有测试。在FRT距离(p<0.000005)、完成TUG所需时间(p<0.0005)和BBS评分(p<0.001)方面,未穿年龄服和穿年龄服表现有统计学差异。参与者得分与标准的FRT和TUG得分的比较表明,该套装使大多数参与者“衰老”到老年人(60岁以上)的标准值,其中一些达到了70-89岁的个体的值。然而,没有得分达到表明跌倒风险增加的值。年龄套装是一种有效的教育工具,它扩展了年龄模拟的价值,使那些与老年人一起工作的人能够体验和理解老年人平衡所经历的功能挑战,这是他们训练的一部分。
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引用次数: 3
Conception and design of novel lumbar drain insertion simulator 新型腰椎引流管插入模拟器的构想与设计
IF 1.1 Q2 Social Sciences Pub Date : 2021-06-28 DOI: 10.1136/bmjstel-2021-000873
N. Murthy, Ellen K. O’Brien, N. Dahdaleh
Lumbar drain insertion is a common procedure that is performed by anaesthesiologists, radiologists and neurosurgeons that is generally taught through supervised learning that can place patients at risk. We describe in detail the creation and considerations of a novel lumbar drain simulator designed to allow learners to rehearse the complete lumbar drain insertion procedure from start to finish. A lumbar drain simulator was designed with the goal of simulating drain placement on a patient including identifying physical landmarks, sterile field preparation, technical steps of the procedure, troubleshooting and securing and connecting the drainage system. Emphasis was placed on simulating the structural components of the anatomic compartments encountered during needle insertion and accurate reproduction of the tactile aspects of the procedure. The simulator is able to reproduce the critical aspects of drain placement, allowing for learners to practice a complete lumbar drain placement from start to finish. A complete simulation of lumbar drain placement can be created that allows learners to practise all aspects of the lumbar drain procedure. Learners can rehearse all steps of the procedure allowing them to be more confident and facile with the procedure, which can lead to improved patient safety and satisfaction.
腰椎引流管插入是一种常见的手术,由麻醉师、放射科医生和神经外科医生进行,通常是通过监督学习来教授的,这可能会使患者处于危险之中。我们详细描述了一种新颖的腰椎引流模拟器的创建和考虑因素,该模拟器旨在让学习者从头到尾排练完整的腰椎引流插入过程。设计了腰椎引流模拟器,目的是模拟患者的引流放置,包括识别物理标志,无菌场准备,操作技术步骤,故障排除以及固定和连接引流系统。重点放在模拟在针插入过程中遇到的解剖隔室的结构成分和准确再现手术的触觉方面。模拟器能够重现引流放置的关键方面,允许学习者从头到尾练习完整的腰椎引流放置。一个完整的模拟腰椎引流放置可以创建,允许学习者练习腰椎引流过程的各个方面。学习者可以预演手术的所有步骤,使他们对手术更有信心和熟练,这可以提高患者的安全性和满意度。
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引用次数: 0
Reinstating a national simulation programme in anaesthesiology during the coronavirus pandemic. 在冠状病毒大流行期间恢复国家麻醉学模拟计划。
IF 1.1 Q2 Social Sciences Pub Date : 2021-06-28 eCollection Date: 2021-01-01 DOI: 10.1136/bmjstel-2021-000894
Sinead Campbell, Sarah Corbett, Crina L Burlacu

Background: With the introduction of strict public health measures due to the coronavirus pandemic, we have had to change how we deliver simulation training. In order to reinstate the College of Anaesthesiologists Simulation Training (CAST) programme safely, we have had to make significant logistical changes. We discuss the process of reopening a national simulation anaesthesiology programme during a pandemic.

Methods: We approached how to reinstate the programme with three distinct but intertwined projects, as in the following: (1) a survey of effects of the pandemic on training opportunities for anaesthesiology trainees, (2) proposals for methods of reinstating simulation were developed under the headings avoidance, compromise, accommodation and collaboration. A small online video-assisted simulation pilot was carried out to test the compromise method, (3) having opted for combined accommodation (onsite with smaller participant numbers and safety measures) and collaboration (with other regional centres), a postreinstatement evaluation during a 4-month period was carried out.

Results: (1) Eighty-five per cent of 64 trainees surveyed felt that they had missed out not only just on simulation-based education (43%) but also on other training opportunities, (2) when five trainees were asked to state on a 1 to 5 Likert scale (strongly disagree, disagree, undecided, agree and strongly agree) whether online video-assisted simulation was similar to face-to-face simulation in four categories (realism, immersion, sense of crisis and stress), only 9 (45%) of the 20 answers agreed they were similar, (3) When onsite simulation was reinstated, the majority of trainees felt that training was similar to prepandemic and were happy to continue with this format.

Conclusion: In order to reinstate simulation, we have identified that accommodation and collaboration best suited the CAST while compromise failed to rank high among trainees' preferences. Onsite courses will continue to be delivered safely while meeting the high standards our trainees have come to expect.

背景:由于冠状病毒大流行而采取了严格的公共卫生措施,我们不得不改变提供模拟培训的方式。为了安全地恢复麻醉医师学院模拟培训(CAST)计划,我们不得不在后勤方面做出重大改变。我们讨论了在大流行病期间重开国家模拟麻醉学计划的过程:我们通过以下三个不同但相互交织的项目来探讨如何恢复该计划:(1)调查大流行对麻醉学学员培训机会的影响,(2)在避免、妥协、通融与合作的标题下提出恢复模拟的方法建议。为测试折中方法,进行了一次小型在线视频辅助模拟试验;(3) 在选择了综合住宿(现场,参与人数较少,并采取了安全措施)和合作(与其他地区中心合作)后,进行了为期 4 个月的恢复后评估。结果如下(1) 在接受调查的 64 名受训人员中,85% 的人认为他们不仅错过了模拟教学(43%),还错过了其他培训机会,(2) 当 5 名受训人员被要求用 1 到 5 级李克特量表(非常不同意、不同意、未决定、(3) 当恢复现场模拟时,大多数受训人员认为培训与学前模拟相似,并乐意继续采用这种形式。结论:为了恢复模拟培训,我们发现通融与合作最适合中国科学技术大学,而折衷方案在受训者的偏好中排名不高。我们将继续安全地提供现场课程,同时满足受训人员的高标准要求。
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引用次数: 0
Teaching residents how to break bad news: piloting a resident-led curriculum and feedback task force as a proof-of-concept study 教住院医生如何传达坏消息:试点一个由住院医生主导的课程和反馈工作组,作为概念验证研究
IF 1.1 Q2 Social Sciences Pub Date : 2021-06-22 DOI: 10.1136/bmjstel-2021-000897
Joseph Sleiman, D. J. Savage, Benjamin Switzer, Colleen Y. Colbert, Cory Chevalier, K. Neuendorf, David Harris
Background Breaking bad news (BBN) is a critically important skill set for residents. Limited formal supervision and unpredictable timing of bad news delivery serve as barriers to the exchange of meaningful feedback. Purpose of study The goal of this educational innovation was to improve internal medicine residents’ communication skills during challenging BBN encounters. A formal BBN training programme and innovative on-demand task force were part of this two-phase project. Study design Internal medicine residents at a large academic medical centre participated in an interactive workshop focused on BBN. Workshop survey results served as a needs assessment for the development of a novel resident-led BBN task force. The task force was created to provide observations at the bedside and feedback after BBN encounters. Training of task force members incorporated video triggers and a feedback checklist. Inter-rater reliability was analysed prior to field testing, which provided data on real-world implementation challenges. Results 148 residents were trained during the 2-hour communications skills workshop. Based on survey results, 73% (108 of 148) of the residents indicated enhanced confidence in BBN after participation. Field testing of the task force on a hospital ward revealed potential workflow barriers for residents requesting observations and prompted troubleshooting. Solutions were implemented based on field testing results. Conclusions A trainee-led BBN task force and communication skills workshop is offered as an innovative model for improving residents’ interpersonal and communication skills in BBN. We believe the model is both sustainable and reproducible. Lessons learnt are offered to aid in implementation in other settings.
突发坏消息(BBN)对居民来说是一项至关重要的技能。有限的正式监督和不可预测的坏消息发布时间阻碍了有意义反馈的交流。这项教育创新的目的是提高内科住院医师在遇到具有挑战性的BBN时的沟通技巧。正式的BBN培训方案和创新的按需工作队是这个两阶段项目的一部分。研究设计一个大型学术医疗中心的内科住院医师参加了一个以BBN为重点的互动研讨会。讲习班调查结果作为发展一个新的居民领导的BBN工作队的需求评估。该工作组的成立是为了提供床边观察和BBN遭遇后的反馈。对工作队成员的培训包括视频触发器和反馈清单。在现场测试之前,对内部可靠性进行了分析,提供了实际实施挑战的数据。结果共培训148名住院医师。根据调查结果,73%(148人中的108人)的居民表示参与后对BBN的信心增强。工作队在医院病房的现场测试揭示了要求观察的住院医生可能存在的工作流程障碍,并提示了故障排除。根据现场测试结果实施了解决方案。结论以学员为主导的BBN工作小组和沟通技巧工作坊是提高BBN居民人际关系和沟通技巧的创新模式。我们相信这种模式是可持续的,也是可复制的。提供了经验教训,以帮助在其他情况下实施。
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引用次数: 2
3D printed ascending aortic simulators with physiological fidelity for surgical simulation 3D打印升主动脉模拟器,具有生理逼真度,用于外科模拟
IF 1.1 Q2 Social Sciences Pub Date : 2021-06-21 DOI: 10.1136/bmjstel-2021-000868
Ali Alakhtar, A. Emmott, C. Hart, R. Mongrain, R. Leask, K. Lachapelle
Introduction Three-dimensional (3D) printed multimaterial ascending aortic simulators were created to evaluate the ability of polyjet technology to replicate the distensibility of human aortic tissue when perfused at physiological pressures. Methods Simulators were developed by computer-aided design and 3D printed with a Connex3 Objet500 printer. Two geometries were compared (straight tube and idealised aortic aneurysm) with two different material variants (TangoPlus pure elastic and TangoPlus with VeroWhite embedded fibres). Under physiological pressure, β Stiffness Index was calculated comparing stiffness between our simulators and human ascending aortas. The simulators’ material properties were verified by tensile testing to measure the stiffness and energy loss of the printed geometries and composition. Results The simulators’ geometry had no effect on measured β Stiffness Index (p>0.05); however, β Stiffness Index increased significantly in both geometries with the addition of embedded fibres (p<0.001). The simulators with rigid embedded fibres were significantly stiffer than average patient values (41.8±17.0, p<0.001); however, exhibited values that overlapped with the top quartile range of human tissue data suggesting embedding fibres can help replicate pathological human aortic tissue. Biaxial tensile testing showed that fiber-embedded models had significantly higher stiffness and energy loss as compared with models with only elastic material for both tubular and aneurysmal geometries (stiffness: p<0.001; energy loss: p<0.001). The geometry of the aortic simulator did not statistically affect the tensile tested stiffness or energy loss (stiffness: p=0.221; energy loss: p=0.713). Conclusion We developed dynamic ultrasound-compatible aortic simulators capable of reproducing distensibility of real aortas under physiological pressures. Using 3D printed composites, we are able to tune the stiffness of our simulators which allows us to better represent the stiffness variation seen in human tissue. These models are a step towards achieving better simulator fidelity and have the potential to be effective tools for surgical training.
研究人员创建了三维(3D)打印多材料升主动脉模拟器,以评估多射流技术复制人体主动脉组织在生理压力下灌注时的扩张能力。方法采用计算机辅助设计,利用Connex3 Objet500打印机进行三维打印。使用两种不同的材料变体(TangoPlus纯弹性和TangoPlus嵌入VeroWhite纤维)比较了两种几何形状(直管和理想的主动脉瘤)。在生理压力下,将模拟器与人升主动脉的刚度进行比较,计算β刚度指数。通过拉伸测试验证了模拟器的材料性能,以测量打印几何形状和组成的刚度和能量损失。结果模拟器的几何形状对测量的β刚度指数没有影响(p>0.05);然而,随着嵌入纤维的加入,两种几何形状的β刚度指数都显著增加(p<0.001)。植入刚性纤维的模拟器硬度显著高于患者平均值(41.8±17.0,p<0.001);然而,所展示的数值与人体组织数据的前四分位数范围重叠,表明嵌入纤维可以帮助复制病理的人类主动脉组织。双轴拉伸测试表明,无论是管状还是动脉瘤状几何形状,与仅使用弹性材料的模型相比,嵌入纤维的模型具有显著更高的刚度和能量损失(刚度:p<0.001;能量损失:p<0.001)。主动脉模拟器的几何形状对拉伸测试刚度或能量损失没有统计学影响(刚度:p=0.221;能量损失:p=0.713)。结论研制了动态超声兼容主动脉模拟器,能够模拟真实主动脉在生理压力下的扩张。使用3D打印复合材料,我们能够调整模拟器的刚度,这使我们能够更好地代表人体组织中看到的刚度变化。这些模型是朝着实现更好的模拟器保真度迈出的一步,并有可能成为外科训练的有效工具。
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引用次数: 1
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BMJ Simulation & Technology Enhanced Learning
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