Simulation and virtual reality in surgical education: real or unreal?

Lessons Learned From Building a Global Health Partnership on Obstetric Care in Madagascar

The authors share experiences of a global health partnership that worked to promote equity through a commitment to shared values and goals, engagement and communication, and mutual trust and respect.

The silver lining of the pandemic in surgical education: virtual surgical education and recommendations for best practices

Virtual education is an evolving field within the realm of surgical training. Since the onset of the COVID-19 pandemic, the application of virtual technologies in surgical education has undergone significant exploration and advancement. While originally developed to supplement in-person curricula for the development of clinical decision-making, virtual surgical education has expanded into the realms of clinical decision-making, surgical, and non-surgical skills acquisition. This manuscript aims to discuss the various applications of virtual surgical education as well as the advantages and disadvantages associated with each education modality, while offering recommendations on best practices and future directions.

Face, Content, and Construct Validity Evaluation of Simulation Models in General Surgery Laparoscopic Training and Education: A Systematic Review

BACKGROUND

Laparoscopic technical surgical skills (LTS) are considered a fundamental competence for General Surgery residents. Several simulation tools (ST) have been explored to develop LTS. Although a plethora of systematic reviews evaluate the translation of LTS developed in simulation to real surgery, there is a lack of evidence that clarifies effectiveness of different validated ST in acquisition of LTS in surgical residents. The aim of this systematic review (SR) is to summarize published evidence on ST validation used for surgery education and training.

METHODS

A protocol was published in PROSPERO. A SR was carried out following PRISMA guidelines. Complete published articles in English or Spanish that validate either content or construct, plus another form of validation of ST to acquire LTS in general surgery were included. Articles that used only one validation or did not validate an ST were excluded.

RESULTS

1052 publications were initially identified across all searched databases. Title review identified 204 studies eligible for full text screening. 10 studies were included for final review. Two studies assessed both face and content, 4 face and construct, and 4 face, content and construct validity. None of the studies presented comparable outcomes due to metrics variation and scores used for the validation strategies.

CONCLUSIONS

This study assessed validated laparoscopic simulation models, particularly in content and construct validity. Articles reported an increased use of simulation models in laparoscopic training with positive feedback from trainees, but few studies reported validation of training model. Validation strategies are not standardized, limiting comparability between them.

Preparing future health care workers for interactions with people with dementia: A mixed methods study

Strategies used in training future health professionals have expanded from traditional methods to a variety of approaches, including sensitivity training. Students who receive disease-specific sensitivity training are more compassionate to patients. Alzheimer's disease (AD) sensitivity training includes deficit-focused dementia tours that physically alter sensations. This embedded-experimental (between-subjects) variant mixed-methods study assessed the effectiveness of virtual reality as a delivery format for dementia tours compared to dementia tours that physically alter sensations. It also compared the effectiveness of deficit-focused dementia sensitivity training to reading strengths-focused case studies, a traditional instruction method. Forty-one university students were randomized into one of three conditions. All participants completed pre- and post-assessments and were interviewed. Quantitative results indicate that a dementia tour offered through virtual reality is as effective as a physical-based tour; however, compared to reading case studies, participants reported poorer attitudes about living with AD and feeling less prepared for caregiving. The qualitative results show an increase in empathy across all conditions. Integration of findings indicates that dementia tours in both formats are effective at encouraging empathy and that both strengths-based and deficit-based sensitivity training are important components of education for future health care workers.

Improved surgeon performance following cadaveric simulation of internal carotid artery injury during endoscopic endonasal surgery: training outcomes of a nationwide prospective educational intervention

OBJECTIVE

Internal carotid artery injury (ICAI) is a rare, life-threatening complication of endoscopic endonasal approaches that will be encountered by most skull base neurosurgeons and otolaryngologists. Rates of surgical proficiency for managing ICAI are not known, and the role of simulation to improve performance has not been studied on a nationwide scale.

METHODS

Attending and resident neurosurgery and otorhinolaryngology surgeons (n = 177) were recruited from multicenter regional and national training courses to assess training outcomes and validity at scale of a prospective educational intervention to improve surgeon technical skills using a previously validated, perfused human cadaveric simulator. Participants attempted an initial trial (T1) of simulated ICAI control using their preferred technique. An educational intervention including personalized instruction was performed. Participants attempted a second trial (T2). Task success (dichotomous), time to hemostasis (TTH), estimated blood loss (EBL), and surgeon heart rate were measured.

RESULTS

Participant rating scales confirmed that the simulation retained face and construct validity across eight instructional settings. Trial success (ICAI control) improved from 56% in T1 to 90% in T2 (p < 0.0001). EBL and TTH decreased by 37% and 38%, respectively (p < 0.0001). Postintervention resident surgeon performance (TTH, EBL, and success rate) was superior to preintervention attending surgeon performance. The most improved quartile of participants achieved 62% improvement in TTH and 73% improvement in EBL, with trial success improvement from 25.6% in T1 to 100% in T2 (p < 0.0001). Baseline surgeon confidence was uncorrelated with T1 success, while posttraining confidence correlated with T2 success. Tachycardia was measured in 57% of surgeon participants, but was attenuated during T2, consistent with development of resiliency.

CONCLUSIONS

Prior to training, many attending and most resident surgeons could not manage the rare, life-threatening intraoperative complication of ICAI. A simulated educational intervention significantly improved surgeon performance and remained valid when deployed at scale. Simulation also promoted the development of favorable cognitive skills (accurate perception of skill and resiliency). Rare, life-threatening intraoperative complications may be optimal targets for educational interventions using surgical simulation.

A Novel Suture Training System for Open Surgery Replicating Procedures Performed by Experts Using Augmented Reality

The surgical education environment has been changing significantly due to restricted work hours, limited resources, and increasing public concern for safety and quality, leading to the evolution of simulation-based training in surgery. Of the various simulators, low-fidelity simulators are widely used to practice surgical skills such as sutures because they are portable, inexpensive, and easy to use without requiring complicated settings. However, since low-fidelity simulators do not offer any teaching information, trainees do self-practice with them, referring to textbooks or videos, which are insufficient to learn open surgical procedures. This study aimed to develop a new suture training system for open surgery that provides trainees with the three-dimensional information of exemplary procedures performed by experts and allows them to observe and imitate the procedures during self-practice. The proposed system consists of a motion capture system of surgical instruments and a three-dimensional replication system of captured procedures on the surgical field. Motion capture of surgical instruments was achieved inexpensively by using cylindrical augmented reality (AR) markers, and replication of captured procedures was realized by visualizing them three-dimensionally at the same position and orientation as captured, using an AR device. For subcuticular interrupted suture, it was confirmed that the proposed system enabled users to observe experts' procedures from any angle and imitate them by manipulating the actual surgical instruments during self-practice. We expect that this training system will contribute to developing a novel surgical training method that enables trainees to learn surgical skills by themselves in the absence of experts.

Augmented Reality in Medical Practice: From Spine Surgery to Remote Assistance

Background: While performing surgeries in the OR, surgeons and assistants often need to access several information regarding surgical planning and/or procedures related to the surgery itself, or the accessory equipment to perform certain operations. The accessibility of this information often relies on the physical presence of technical and medical specialists in the OR, which is increasingly difficult due to the number of limitations imposed by the COVID emergency to avoid overcrowded environments or external personnel. Here, we analyze several scenarios where we equipped OR personnel with augmented reality (AR) glasses, allowing a remote specialist to guide OR operations through voice and ad-hoc visuals, superimposed to the field of view of the operator wearing them.

Methods: This study is a preliminary case series of prospective collected data about the use of AR-assistance in spine surgery from January to July 2020. The technology has been used on a cohort of 12 patients affected by degenerative lumbar spine disease with lumbar sciatica co-morbidities. Surgeons and OR specialists were equipped with AR devices, customized with P2P videoconference commercial apps, or customized holographic apps. The devices were tested during surgeries for lumbar arthrodesis in a multicenter experience involving author's Institutions.

Findings: A total number of 12 lumbar arthrodesis have been performed while using the described AR technology, with application spanning from telementoring (3), teaching (2), surgical planning superimposition and interaction with the hologram using a custom application for Microsoft hololens (1). Surgeons wearing the AR goggles reported a positive feedback as for the ergonomy, wearability and comfort during the procedure; being able to visualize a 3D reconstruction during surgery was perceived as a straightforward benefit, allowing to speed-up procedures, thus limiting post-operational complications. The possibility of remotely interacting with a specialist on the glasses was a potent added value during COVID emergency, due to limited access of non-resident personnel in the OR.

Interpretation: By allowing surgeons to overlay digital medical content on actual surroundings, augmented reality surgery can be exploited easily in multiple scenarios by adapting commercially available or custom-made apps to several use cases. The possibility to observe directly the operatory theater through the eyes of the surgeon might be a game-changer, giving the chance to unexperienced surgeons to be virtually at the site of the operation, or allowing a remote experienced operator to guide wisely the unexperienced surgeon during a procedure.

Virtual reality mobile application to improve videoscopic airway training: A randomised trial

Introduction: Flexible bronchoscopic intubation (FBI) is an important technique in managing an anticipated difficult airway, yet it is rarely performed and has a steep learning curve. We aim to evaluate if the integration of virtual reality gaming application into routine FBI training for emergency department doctors would be more effective than traditional teaching methods. Methods: We conducted a randomised controlled trial to compare self-directed learning using the mobile application, Airway Ex* in the intervention group versus the control group without use of the mobile application. All participants underwent conventional didactic teaching and low-fidelity simulation with trainer’s demonstration and hands-on practice on a manikin for FBI. Participants randomised to the intervention arm received an additional 30 minutes of self-directed learning using Airway Ex, preloaded on electronic devices while the control arm did not. The primary outcome was time taken to successful intubation. Results: Forty-five physicians (20 junior and 25 senior physicians) were enrolled, with male predominance (57.8%, 26/45). There was no difference in time taken to successful intubation (median 48 seconds [interquartile range, IQR 41–69] versus 44 seconds [IQR 37–60], P=0.23) between the control and intervention groups, respectively. However, the intervention group received better ratings (median 4 [IQR 4–5]) for the quality of scope manipulation skills compared to control (median 4 [IQR 3–4], adjusted P=0.03). This difference remains significant among junior physicians in stratified analysis. Conclusion: Incorporating virtual reality with traditional teaching methods allows learners to be trained on FBI safely without compromising patient care. Junior physicians appear to benefit more compared to senior physicians. Keywords: Airway management, emergency medicine, intubation, simulation education, virtual reality

Virtual and Augmented Reality Applications in Medicine: Analysis of the Scientific Literature

BACKGROUND

Virtual reality (VR) and augmented reality (AR) have recently become popular research themes. However, there are no published bibliometric reports that have analyzed the corresponding scientific literature in relation to the application of these technologies in medicine.

OBJECTIVE

We used a bibliometric approach to identify and analyze the scientific literature on VR and AR research in medicine, revealing the popular research topics, key authors, scientific institutions, countries, and journals. We further aimed to capture and describe the themes and medical conditions most commonly investigated by VR and AR research.

METHODS

The Web of Science electronic database was searched to identify relevant papers on VR research in medicine. Basic publication and citation data were acquired using the "Analyze" and "Create Citation Report" functions of the database. Complete bibliographic data were exported to VOSviewer and Bibliometrix, dedicated bibliometric software packages, for further analyses. Visualization maps were generated to illustrate the recurring keywords and words mentioned in the titles and abstracts.

RESULTS

The analysis was based on data from 8399 papers. Major research themes were diagnostic and surgical procedures, as well as rehabilitation. Commonly studied medical conditions were pain, stroke, anxiety, depression, fear, cancer, and neurodegenerative disorders. Overall, contributions to the literature were globally distributed with heaviest contributions from the United States and United Kingdom. Studies from more clinically related research areas such as surgery, psychology, neurosciences, and rehabilitation had higher average numbers of citations than studies from computer sciences and engineering.

CONCLUSIONS

The conducted bibliometric analysis unequivocally reveals the versatile emerging applications of VR and AR in medicine. With the further maturation of the technology and improved accessibility in countries where VR and AR research is strong, we expect it to have a marked impact on clinical practice and in the life of patients.

Development and evaluation of a new pediatric mixed-reality model for neurosurgical training

OBJECTIVE

Craniosynostosis is a premature cranial suture junction and requires a craniectomy to decrease cranial compression and remodel the affected areas of the skull. However, mastering these neurosurgical procedures requires many years of supervised training. The use of surgical simulation can reduce the risk of intraoperative error. The authors propose a new instrument for neurosurgical education, which mixes reality with virtual and realistic simulation for repair of craniosynostosis (scaphocephaly type).

METHODS

This study tested reality simulators with a synthetic thermo-retractile/thermosensitive rubber joined with different polymers. To validate the model, 18 experienced surgeons participated in this study using 3D videos developed using 3DS Max software. Renier's "H" technique for craniosynostosis correction was applied during the simulation. All participants completed questionnaires to evaluate the simulator.

RESULTS

An expert surgical team approved the craniosynostosis reality and virtual simulators. More than 94% of participants found the simulator relevant, considering aspects such as weight, surgical positioning, dissection by planes, and cranial reconstruction. The consistency and material resistance were also approved on average by more than 60% of the surgeons.

CONCLUSIONS

The virtual simulator demands a high degree of effectiveness with 3D perception in anatomy and operative strategies in neurosurgical training. Physical and virtual simulation with mixed reality required psychomotor and cognitive abilities otherwise acquired only during practical surgical training with supervision.

Simulation in Cleft Surgery

A number of digital and haptic simulators have been developed to address challenges facing cleft surgery education. However, to date, a comprehensive review of available simulators has yet to be performed. Our goal is to appraise cleft surgery simulators that have been described to date, their role within a simulation-based educational strategy, the costs associated with their use, and data supporting or refuting their utility.

The Development and Application of Virtual Reality Animation Simulation Technology: Take Gastroscopy Simulation System as an Example

Virtual reality (VR) technology has a great potential in the field of medical simulation due to its immersion, interactivity and autonomy. It provides a new direction for integration and application in various disciplines. Combination of VR technology and clinical practice brings great convenience for medical education and experiments. Modern VR simulators can create realistic environments that capture minute anatomical details with high accuracy and solves the problem of difficulty in mass productions with traditional devices. Taking gastroscopy simulation system as an example, this paper discusses the development and application of VR animation technology, together with its excellent performance and current research status in surgery, scientific research, training and education.

Haptic, Physical, and Web-Based Simulators: Are They Underused in Maxillofacial Surgery Training?

PURPOSE

Surgical residencies have increasingly incorporated both digital and mannequin simulation into their training programs. The aim of our review was to identify all digital and mannequin maxillofacial simulators available for education and training, highlight their benefit, and critically assess the evidence in support of these educational resources.

MATERIALS AND METHODS

We performed a comprehensive literature review of all peer-reviewed publications of digital and mannequin simulators that met the inclusion criteria, defined as any simulator used in education or training. All simulators used in surgical planning were excluded. Before the query, it was hypothesized that most studies would be descriptive in nature and supported by low levels of evidence. Literature search strategies included the use of multiple combinations of key search terms, review of titles and abstracts, and precise identification of the use of the simulator described. All statistics were descriptive.

RESULTS

The primary search yielded 259 results, from which 22 total simulators published on from 2001 to 2016 were identified using the inclusion and exclusion criteria: 10 virtual reality haptic-based simulators, 6 physical model simulators, and 6 Web-based simulators used for a variety of procedures such as dental skills, instrument handling, orthognathic surgery (Le Fort I osteotomy, vertical ramus osteotomy, bilateral sagittal split ramus osteotomy), genioplasty, bone grafting, sinus surgery, cleft lip repair, orbital floor repair, and oral biopsy. Only 9 formalized studies were completed; these were classified as low-level evidence-based cohort studies (Levels IV and V). All other simulator reports were descriptive in nature. There were no studies with high levels of evidence completed (Level I to III).

CONCLUSIONS

The results of this review suggest that, although seemingly beneficial to the trainee in maxillofacial surgery, simulation in education in this field is an underused commodity because of the significant lack of scientific and validated study designs reported on in the literature thus far. The maxillofacial and simulation communities would benefit from studies on utility and efficacy with higher levels of evidence.

Utilizing virtual and augmented reality for educational and clinical enhancements in neurosurgery

Neurosurgery has undergone a technological revolution over the past several decades, from trephination to image-guided navigation. Advancements in virtual reality (VR) and augmented reality (AR) represent some of the newest modalities being integrated into neurosurgical practice and resident education. In this review, we present a historical perspective of the development of VR and AR technologies, analyze its current uses, and discuss its emerging applications in the field of neurosurgery.

Learning anatomy via mobile augmented reality: Effects on achievement and cognitive load

Augmented reality (AR), a new generation of technology, has attracted the attention of educators in recent years. In this study, a MagicBook was developed for a neuroanatomy topic by using mobile augmented reality (mAR) technology. This technology integrates virtual learning objects into the real world and allow users to interact with the environment using mobile devices. The purpose of this study was to determine the effects of learning anatomy via mAR on medical students' academic achievement and cognitive load. The mixed method was applied in the study. The random sample consisted of 70 second-year undergraduate medical students: 34 in an experimental group and 36 in a control group. Academic achievement test and cognitive load scale were used as data collection tool. A one-way MANOVA test was used for analysis. The experimental group, which used mAR applications, reported higher achievement and lower cognitive load. The use of mAR applications in anatomy education contributed to the formation of an effective and productive learning environment. Student cognitive load decreased as abstract information became concrete in printed books via multimedia materials in mAR applications. Additionally, students were able to access the materials in the MagicBook anytime and anywhere they wanted. The mobile learning approach helped students learn better by exerting less cognitive effort. Moreover, the sensory experience and real time interaction with environment may provide learning satisfaction and enable students to structure their knowledge to complete the learning tasks. Anat Sci Educ 9: 411-421. © 2016 American Association of Anatomists.

New anatomical simulator for pediatric neuroendoscopic practice

INTRODUCTION

The practice of neuroendoscopic procedures requires many years of training to obtain the adequate skills to perform these operations safely. In this study, we present a new pediatric neuroendoscopic simulator that facilitates training.

DESCRIPTION OF THE SIMULATOR

This realistic simulator was built with a synthetic thermo-retractile and thermo-sensible rubber called Neoderma® which, when combined with different polymers, produces more than 30 different formulae, which present textures, consistencies, and mechanical resistances similar to many human tissues. Silicon and fiberglass molds, in the shape of the cerebral ventricles, constitute the basic structure of the neuroendoscopic training module. The module offers the possibility for practicing many basic neuroendoscopic techniques such as: navigating the ventricular system to visualize important anatomic landmarks (e.g., septal and thalamostriate veins, foramen of Monro, temporal horns, aqueduct, and fourth ventricle), performing third ventriculostomy and choroid plexus cauterization, and resecting intraventricular "tumors" that bleed.

CONCLUSION

It is important to emphasize that it is possible to perform with this simulator not only the rigid but also the flexible endoscopy, with good correspondence to reality and no risks. Notable future perspectives can be considered regarding this new pediatric simulator, for example, to improve the learning curve for nonexperienced neurosurgeons and to spread the flexible endoscopy technique.

An anatomically sound surgical simulation model for myringotomy and tympanostomy tube insertion

OBJECTIVE

Myringotomy and tympanostomy tube insertion (MT) is a common surgical procedure. Although surgical simulation has proven to be an effective training tool, an anatomically sound simulation model for MT is lacking. We developed such a model and assessed its impact on the operating room performance of senior medical students.

STUDY DESIGN

Prospective randomized trial.

METHODS

A randomized single-blind controlled study of simulation training with the MT model versus no simulation training. Each participant was randomized to either the simulation model group or control group, after performing an initial MT procedure. Within two weeks of the first procedure, the students performed a second MT. All procedures were performed on real patients and rated with a Global Rating Scale by two attending otolaryngologists. Time to complete the MT was also recorded.

RESULTS

Twenty-four senior medical students were enrolled. Control and intervention groups did not differ at baseline on their Global Rating Scale score or time to complete the MT procedure. Following simulation training, the study group received significantly higher scores (P=.005) and performed the MT procedure in significantly less time (P=.034). The control group did not improve their performance scores (P>.05) or the time to complete the procedure (P>.05).

CONCLUSION

Our surgical simulation model shows promise for being a valuable teaching tool for MT for senior medical students. Such anatomically appropriate physical simulators may benefit teaching of junior trainees.

The Role of Simulation in the Learning of Surgical Skills

Many authors have published theories regarding the learning of practical (surgical) skills. Table 1 contains a useful summary of these theories. Simulation has been defined by Allery et al as 'a structured activity designed to reflect reality, real life and real situations',1 and good simulation has been defined by Gorman et al as 'represent [ing] simplified reality, free from the need to include every possible detail'.2 when discussing simulation in education, issenberg, et al stated: 'Simulations are not identical to real-life events. Instead simulations place trainees into lifelike situations that provide immediate feedback about questions, decisions and actions.'3

Simulation in healthcare: a taxonomy and a conceptual framework for instructional design and media selection

BACKGROUND

Simulation in healthcare lacks a dedicated framework and supporting taxonomy for instructional design (ID) to assist educators in creating appropriate simulation learning experiences.

AIMS

This article aims to fill the identified gap. It provides a conceptual framework for ID of healthcare simulation.

METHODS

The work is based on published literature and authors' experience with simulation-based education.

RESULTS

The framework for ID itself presents four progressive levels describing the educational intervention. Medium is the mode of delivery of instruction. Simulation modality is the broad description of the simulation experience and includes four modalities (computer-based simulation, simulated patient (SP), simulated clinical immersion, and procedural simulation) in addition to mixed, hybrid simulations. Instructional method describes the techniques used for learning. Presentation describes the detailed characteristics of the intervention. The choice of simulation as a learning medium is based on a matrix of simulation relating acuity (severity) to opportunity (frequency) of events, with a corresponding zone of simulation. An accompanying chart assists in the selection of appropriate media and simulation modalities based on learning outcomes.

CONCLUSION

This framework should help educators incorporate simulation in their ID efforts. It also provides a taxonomy to streamline future research and ID efforts in simulation.

Simulation-based surgical education

The reduction in time for training at the workplace has created a challenge for the traditional apprenticeship model of training. Simulation offers the opportunity for repeated practice in a safe and controlled environment, focusing on trainees and tailored to their needs. Recent technological advances have led to the development of various simulators, which have already been introduced in surgical training. The complexity and fidelity of the available simulators vary, therefore depending on our recourses we should select the appropriate simulator for the task or skill we want to teach. Educational theory informs us about the importance of context in professional learning. Simulation should therefore recreate the clinical environment and its complexity. Contemporary approaches to simulation have introduced novel ideas for teaching teamwork, communication skills and professionalism. In order for simulation-based training to be successful, simulators have to be validated appropriately and integrated in a training curriculum. Within a surgical curriculum, trainees should have protected time for simulation-based training, under appropriate supervision. Simulation-based surgical education should allow the appropriate practice of technical skills without ignoring the clinical context and must strike an adequate balance between the simulation environment and simulators.

Virtual cerebral ventricular system: an MR-based three-dimensional computer model

The inherent spatial complexity of the human cerebral ventricular system, coupled with its deep position within the brain, poses a problem for conceptualizing its anatomy. Cadaveric dissection, while considered the gold standard of anatomical learning, may be inadequate for learning the anatomy of the cerebral ventricular system; even with intricate dissection, ventricular structures remain difficult to observe. Three-dimensional (3D) computer reconstruction of the ventricular system offers a solution to this problem. This study aims to create an accurate 3D computer reconstruction of the ventricular system with surrounding structures, including the brain and cerebellum, using commercially available 3D rendering software. Magnetic resonance imaging (MRI) scans of a male cadaver were segmented using both semiautomatic and manual tools. Segmentation involves separating voxels of different grayscale values to highlight specific neural structures. User controls enable adding or removing of structures, altering their opacity, and making cross-sectional slices through the model to highlight inner structures. Complex physiologic concepts, such as the flow of cerebrospinal fluid, are also shown using the 3D model of the ventricular system through a video animation. The model can be projected stereoscopically, to increase depth perception and to emphasize spatial relationships between anatomical structures. This model is suited for both self-directed learning and classroom teaching of the 3D anatomical structure and spatial orientation of the ventricles, their connections, and their relation to adjacent neural and skeletal structures.

The use of computers for perioperative simulation in anesthesia, critical care, and pain medicine

Simulation in perioperative anesthesia training is a field of considerable interest, with an urgent need for tools that reliably train and facilitate objective assessment of performance. This article reviews the available simulation technologies, their evolution, and the current evidence base for their use. The future directions for research in the field and potential applications of simulation technology in anesthesia, critical care, and pain medicine are discussed.

Differentiating levels of surgical experience on a virtual reality temporal bone simulator

Objective

Virtual reality simulation is increasingly being incorporated into surgical training and may have a role in temporal bone surgical education. Here we test whether metrics generated by a virtual reality surgical simulation can differentiate between three levels of experience, namely novices, otolaryngology residents, and experienced qualified surgeons.

Study Design

Cohort study.

Setting

Royal Victorian Eye and Ear Hospital.

Subjects and Methods

Twenty-seven participants were recruited. There were 12 experts, six residents, and nine novices. After orientation, participants were asked to perform a modified radical mastoidectomy on the simulator. Comparisons of time taken, injury to structures, and forces exerted were made between the groups to determine which specific metrics would discriminate experience levels.

Results

Experts completed the simulated task in significantly shorter time than the other two groups (experts 22 minutes, residents 36 minutes, and novices 46 minutes; P = 0.001). Novices exerted significantly higher average forces when dissecting close to vital structures compared with experts (0.24 Newton [N] vs 0.13 N, P = 0.002). Novices were also more likely to injure structures such as dura compared to experts (23 injuries vs 3 injuries, P = 0.001). Compared with residents, the experts modulated their force between initial cortex dissection and dissection close to vital structures. Using the combination of these metrics, we were able to correctly classify the participants’ level of experience 90 percent of the time.

Conclusion

This preliminary study shows that measurements of performance obtained from within a virtual reality simulator can differentiate between levels of users’ experience. These results suggest that simulator training may have a role in temporal bone training beyond foundational training.

Learning the surgical craft: a review of skills training options

Surgical practice is undergoing fundamental changes, and this is having a significant effect on the training of surgeons. Learning the craft of surgery is threatened by reduced elective operative exposure and general service cuts within public teaching hospitals, safer working hour legislation and pressures to accelerate the training of young surgeons. Rapid technological changes mean that 'old dogs' have to teach 'young dogs' many new tricks in a relatively adverse environment. This review outlines the great variety of resources available for skills-based training outside the operating room. These resources are ready to be used as a necessary adjunct to the training of competent surgeons in Australasia.

Virtual reality system for planning minimally invasive neurosurgery

Object

The authors report on their experience with a 3D virtual reality system for planning minimally invasive neurosurgical procedures.

Methods

Between October 2002 and April 2006, the authors used the Dextroscope (Volume Interactions, Ltd.) to plan neurosurgical procedures in 106 patients, including 100 with intracranial and 6 with spinal lesions. The planning was performed 1 to 3 days preoperatively, and in 12 cases, 3D prints of the planning procedure were taken into the operating room. A questionnaire was completed by the neurosurgeon after the planning procedure.

Results

After a short period of acclimatization, the system proved easy to operate and is currently used routinely for preoperative planning of difficult cases at the authors' institution. It was felt that working with a virtual reality multimodal model of the patient significantly improved surgical planning. The pathoanatomy in individual patients could easily be understood in great detail, enabling the authors to determine the surgical trajectory precisely and in the most minimally invasive way.

Conclusions

The authors found the preoperative 3D model to be in high concordance with intraoperative conditions; the resulting intraoperative “déjà-vu” feeling enhanced surgical confidence. In all procedures planned with the Dextroscope, the chosen surgical strategy proved to be the correct choice.

Three-dimensional virtual reality models of a patient allow quick and easy understanding of complex intracranial lesions.

Construction of a three-dimensional interactive model of the skull base and cranial nerves

OBJECTIVE

The goal was to develop an interactive three-dimensional (3-D) computerized anatomic model of the skull base for teaching microneurosurgical anatomy and for operative planning.

METHODS

The 3-D model was constructed using commercially available software (Maya 6.0 Unlimited; Alias Systems Corp., Delaware, MD), a personal computer, four cranial specimens, and six dry bones. Photographs from at least two angles of the superior and lateral views were imported to the 3-D software. Many photographs were needed to produce the model in anatomically complex areas. Careful dissection was needed to expose important structures in the two views. Landmarks, including foramen, bone, and dura mater, were used as reference points.

RESULTS

The 3-D model of the skull base and related structures was constructed using more than 300,000 remodeled polygons. The model can be viewed from any angle. It can be rotated 360 degrees in any plane using any structure as the focal point of rotation. The model can be reduced or enlarged using the zoom function. Variable transparencies could be assigned to any structures so that the structures at any level can be seen. Anatomic labels can be attached to the structures in the 3-D model for educational purposes.

CONCLUSION

This computer-generated 3-D model can be observed and studied repeatedly without the time limitations and stresses imposed by surgery. This model may offer the potential to create interactive surgical exercises useful in evaluating multiple surgical routes to specific target areas in the skull base.

Comparison of anaesthetists' activity patterns in the operating room and during simulation

This study investigated the behavioural aspects of ecological validity of anaesthesia simulation environments using a task analysis approach. Six anaesthesists were observed during two cases performed in the operating room (OR), one routine and two critical incident simulation scenarios. A two-way MANOVA for repeated measures was performed with the independent variables Case (OR/SIM-R/SIM-CI) and Phase Induction/ Maintenance (Emergence), the latter being a repeated measure. Dependent variables were the proportion of each phase spent on each of the observation categories. Statistically significant main effects for Phase concerning communication, monitoring, manual tasks and documentation, for Case concerning communication and documentation, and a significant interaction effect for Phase x Case concerning manual tasks and other were found. Increased action density (i.e. amount of co-occurring activities) was observed during Induction, Emergence and the Management of simulated critical events. The similarities and differences in anaesthetists' activity patterns identified in this study will help to further improve the ecological validity of simulation environments as research settings.

Recent Trends in Minimally Invasive Cardiac Surgery

Evolving technologies have resulted in an increase in minimally invasive cardiac surgery. Currently, robotic systems allow surgeons to perform a variety of procedures through small incisions. This changing paradigm is reviewed.

Can skills assessment on a virtual reality trainer predict a surgical trainee’s talent in laparoscopic surgery?

BACKGROUND

A number of studies have investigated several aspects of feasibility and validity of performance assessments with virtual reality surgical simulators. However, the validity of performance assessments is limited by the reliability of such measurements, and some issues of reliability still need to be addressed. This study aimed to evaluate the hypothesis that test subjects show logarithmic performance curves on repetitive trials for a component task of laparoscopic cholecystectomy on a virtual reality simulator, and that interindividual differences in performance after considerable training are significant. According to kinesiologic theory, logarithmic performance curves are expected and an individual's learning capacity for a specific task can be extrapolated, allowing quantification of a person's innate ability to develop task-specific skills.

METHODS

In this study, 20 medical students at the University of Basel Medical School performed five trials of a standardized task on the LS 500 virtual reality simulator for laparoscopic surgery. Task completion time, number of errors, economy of instrument movements, and maximum speed of instrument movements were measured.

RESULTS

The hypothesis was confirmed by the fact that the performance curves for some of the simulator measurements were very close to logarithmic curves, and there were significant interindividual differences in performance at the end of the repetitive trials.

CONCLUSIONS

Assessment of perceptual motor skills and the innate ability of an individual with no prior experience in laparoscopic surgery to develop such skills using the LS 500 VR surgical simulator is feasible and reliable.

Robotics in reproductive medicine

OBJECTIVE

To review the history, development, current applications, and future of robotic technology.

DESIGN

The MEDLINE database was reviewed for all publications on robotic technology in medicine, surgery, reproductive endocrinology, its role in surgical education, and telepresence surgery.

SETTING

University medical center.

CONCLUSION(S)

Robotic-assisted surgery is an emerging technology, which provides an alternative to traditional surgical techniques in reproductive medicine and may have a role in surgical education and telepresence surgery.

Advanced surgical trauma care training with a live porcine model

OBJECTIVE

To evaluate the benefit of a compulsory operative trauma care course for general surgeons in Norway utilising a live porcine model.

METHODS

The participants rated their expertise in 23 situations pre- and post-session on a scale 1-5, where 1 meant "not competent" and 5 meant "fully competent".

RESULTS

Mean total score increased 43% from pre- to post-session. The increase reached significance with all levels of experience. Procedures rarely performed, like suturing on a beating heart, showed a greater educational benefit than more frequently performed procedures, like inserting a chest tube.

CONCLUSION

The operative trauma care animal session increased the participants' perceived competence significantly. Its use seems justified for education in trauma related lifesaving surgical procedures.

Robot-assisted surgery: training and re-training surgeons

A renaissance in cardiac surgery is occurring. Cardiac operations are being performed through smaller incisions with enhanced technological assistance. Specifically, minimally invasive mitral valve surgery has become standard for many surgeons. At our institution, we have developed a robotic mitral surgery program with the da Vinci telemanipulation system, which has recently gained FDA-approval. Initial results are reported. Despite procedural success, implementation of new technology requires restructuring training programs and re-training senior surgeons. Ultimately, our desire for improved and less traumatic patient care will continue to drive this new technology into the future.

Identifying and reducing errors with surgical simulation

The major determinant of a patient's safety and outcome is the skill and judgment of the surgeon. While knowledge base and decision processing are evaluated during residency, technical skills-which are at the core of the profession-are not evaluated. Innovative state of the art simulation devices that train both surgical tasks and skills, without risk to patients, should allow for the detection and analysis of errors and "near misses". Studies have validated the use of a sophisticated endoscopic sinus surgery simulator (ES3) for training residents on a procedural basis. Assessments are proceeding as to whether the integration of a comprehensive ES3 training programme into the residency curriculum will have long term effects on surgical performance and patient outcomes. Using various otolaryngology residencies, subjects are exposed to mentored training on the ES3 as well as to minimally invasive trainers such as the MIST-VR. Technical errors are identified and quantified on the simulator and intraoperatively. Through a web based database, individual performance can be compared against a national standard. An upgraded version of the ES3 will be developed which will support patient specific anatomical models. This advance will allow study of the effects of simulated rehearsal of patient specific procedures (mission rehearsal) on patient outcomes and surgical errors during the actual procedure. The information gained from these studies will help usher in the next generation of surgical simulators that are anticipated to have significant impact on patient safety.

Identifying and reducing errors with surgical simulation

The major determinant of a patient's safety and outcome is the skill and judgment of the surgeon. While knowledge base and decision processing are evaluated during residency, technical skills-which are at the core of the profession-are not evaluated. Innovative state of the art simulation devices that train both surgical tasks and skills, without risk to patients, should allow for the detection and analysis of errors and "near misses". Studies have validated the use of a sophisticated endoscopic sinus surgery simulator (ES3) for training residents on a procedural basis. Assessments are proceeding as to whether the integration of a comprehensive ES3 training programme into the residency curriculum will have long term effects on surgical performance and patient outcomes. Using various otolaryngology residencies, subjects are exposed to mentored training on the ES3 as well as to minimally invasive trainers such as the MIST-VR. Technical errors are identified and quantified on the simulator and intraoperatively. Through a web based database, individual performance can be compared against a national standard. An upgraded version of the ES3 will be developed which will support patient specific anatomical models. This advance will allow study of the effects of simulated rehearsal of patient specific procedures (mission rehearsal) on patient outcomes and surgical errors during the actual procedure. The information gained from these studies will help usher in the next generation of surgical simulators that are anticipated to have significant impact on patient safety.

Intraoperative stereoscopic QuickTime Virtual Reality

Object. The aim of this study was to acquire intraoperative images during neurosurgical procedures for later reconstruction into a stereoscopic image system (QuickTime Virtual Reality [QTVR]) that would improve visualization of complex neurosurgical procedures.

Methods. A robotic microscope and digital cameras were used to acquire left and right image pairs during cranial surgery; a grid system facilitated image acquisition with the microscope. The surgeon determined a field of interest and a target or pivot point for image acquisition. Images were processed with commercially available software and hardware. Two-dimensional (2D) or interlaced left and right 2D images were reconstructed into a standard or stereoscopic QTVR format. Standard QTVR images were produced if stereoscopy was not needed.

Intraoperative image sequences of regions of interest were captured in six patients. Relatively wide and deep dissections afford an opportunity for excellent QTVR production. Narrow or restricted surgical corridors can be reconstructed into the stereoscopic QTVR mode by using a keyhole mode of image acquisition. The stereoscopic effect is unimpressive with shallow or cortical surface dissections, which can be reconstructed into standard QTVR images.

Conclusions. The QTVR system depicts multiple views of the same anatomy from different angles. By tilting, panning, or rotating the reconstructed images, the user can view a virtual three-dimensional tour of a neurosurgical dissection, with images acquired intraoperatively. The stereoscopic QTVR format provides depth to the montage. The system recreates the dissection environment almost completely and provides a superior anatomical frame of reference compared with the images captured by still or video photography in the operating room.

Robotic mitral valve surgery

A renaissance in cardiac surgery has begun. The early clinical experience with computer-enhanced telemanipulation systems outlines the limitations of this approach despite some procedural success. Technologic advancements, such as the use of nitinol U-clips (Coalescent Surgical Inc., Sunnyvale, CA) instead of sutures requiring manual knot tying, have been shown to decrease operative times significantly. It is expected that with further refinements and development of adjunct technologies, the technique of computer-enhanced endoscopic cardiac surgery will evolve and may prove to be beneficial for many patients. Robotic technology has provided benefits to cardiac surgery. With improved optics and instrumentation, incisions are smaller. The ergometric movements and simulated three-dimensional optics project hand-eye coordination for the surgeon. The placement of the wristlike articulations at the end of the instruments moves the pivoting action to the plane of the mitral annulus. This improves dexterity in tight spaces and allows for ambidextrous suture placement. Sutures can be placed more accurately because of tremor filtration and high-resolution video magnification. Furthermore, the robotic system may have potential as an educational tool. In the near future, surgical vision and training systems might be able to model most surgical procedures through immersive technology. Thus, a "flight simulator" concept emerges where surgeons may be able to practice and perform the operation without a patient. Already, effective curricula for training teams in robotic surgery exist. Nevertheless, certain constraints continue to limit the advancement to a totally endoscopic computer-enhanced mitral valve operation. The current size of the instruments, intrathoracic instrument collisions, and extrathoracic "elbow" conflicts still can limit dexterity. When smaller instruments are developed, these restraints may be resolved. Furthermore, a working port incision is still required for placement of an atrial retractor, as well as needle, tissue, and suture retrieval. With the development of specialized retractors and a delivery/retrieval port, a truly endoscopic approach will be consistently reproducible. New navigation systems and image guided surgery portend an improving future for robotic cardiac surgery. Recently, we have combined robotically guided microwave catheters for ablation of atrial fibrillation with robotic mitral valve repairs (Fig. 8). Thus, we are beginning to achieve the ideal operation, with a native valve repair and a return to normal sinus rhythm. Robotic cardiac surgery is an evolutionary process, and even the greatest skeptics must concede that progress has been made toward endoscopic cardiac valve operations. Surgical scientists must continue to critically evaluate this technology in this new era of cardiac surgery. Despite enthusiasm, caution cannot be overemphasized. Surgeons must be careful because indices of operative safety, speed of recovery, level of discomfort, procedural cost, and long-term operative quality have yet to be defined. Traditional valve operations still enjoy long-term success with ever-decreasing morbidity and mortality, and remain our measure for comparison. Surgeons must remember that we are seeking the most durable operation with the least human trauma and quickest return to normalcy, all done at the lowest cost with the least risks. Although we have moved more asymptotically to these goals, surgeons alone must map the path for the final ascent.

Virtual reality surgery: neurosurgery and the contemporary landscape

OBJECTIVE

Virtual reality-simulated environments have been used for the training of personnel, most notably for military applications, for more than 35 years. The advantages conferred by being able to train novice personnel in a low- to no-risk simulated environment have long been appreciated by the medical community. The recent availability of affordable gigahertz-range microprocessors (once the exclusive domain of the Cray supercomputer) has made photorealistic graphical rendering and manipulation of virtual surgical substrates a reality. Concomitant advances in artificial intelligence systems and the portability of patient-specific magnetic resonance imaging, computed tomographic scanning, and angiographic image data presage the emergence of the surgical simulator as a modern surgical training adjunct. An overview of the status of surgical simulation with regard to its adaptability to current surgical training regimens is presented.

METHODS

Extensive MEDLINE, Internet, and other database searches spanning the years 1960 to 2002 were conducted in an effort to delineate the status of simulated surgical environments.

RESULTS

As would be expected, most articles addressing surgical simulation as their primary focus have been published in the past decade. A review of this literature demonstrates the broadest application in the field of endoscopic (and laparoscopic) procedures, most likely as a result of the reduced engineering burden with respect to incorporation of a haptic interface.

CONCLUSION

The realization of ergonomically acceptable haptic interfaces remains elusive. Improvements in graphical rendering and the incorporation of artificial intelligence functions signal the certain emergence of surgical simulators as a viable supplement to the Halstedian method of surgical training.

Simulation in surgical training: educational issues and practical implications

BACKGROUND

Surgical skills are required by a wide range of health care professionals. Tasks range from simple wound closure to highly complex diagnostic and therapeutic procedures. Technical expertise, although essential, is only one component of a complex picture. By emphasising the importance of knowledge and attitudes, this article aims to locate the acquisition of surgical skills within a wider educational framework.

SIMULATORS

Simulators can provide safe, realistic learning environments for repeated practice, underpinned by feedback and objective metrics of performance. Using a simple classification of simulators into model-based, computer-based or hybrid, this paper summarises the current state of the art and describes recent technological developments. Advances in computing have led to the establishment of precision placement and simple manipulation simulators within health care education, while complex manipulation and integrated procedure simulators are still in the development phase.

EVALUATION

Tension often exists between the design and evaluation of surgical simulations. A lack of high quality published data is compounded by the difficulties of conducting longitudinal studies in such a fast-moving field. The implications of this tension are discussed.

THE WIDER CONTEXT

The emphasis is now shifting from the technology of simulation towards partnership with education and clinical practice. This highlights the need for an integrated learning framework, where knowledge can be acquired alongside technical skills and not in isolation from them. Recent work on situated learning underlines the potential for simulation to feed into and enrich everyday clinical practice.

Robotic Mitral Valve Surgery: A Technologic and Economic Revolution for Heart Centers

A renaissance in cardiac surgery is occurring. Cardiac operations are being performed through smaller incisions with enhanced technologic assistance. Specifically, minimally invasive mitral valve surgery has become standard for many surgeons. At our institution, we have developed a robotic mitral surgery program with the da Vinci telemanipulation system, which has recently gained Food and Drug Administration approval. This system allows the surgeon to perform complex mitral valve operations through small port sites rather than a traditional median sternotomy. Our techniques and initial results are reported. Despite procedural success, these devices are not inexpensive and hospitals will have to justify their purchase. The implementation of robotic surgery has forced us to compare costs and benefits compared with conventional cardiac surgery. Nevertheless, our desire for improved and less traumatic patient care will drive this new technology, which will serve as a good model for us to study over the next several years.

The surgeon for the future and implications for training

Clinical and technical skill may not be sufficient to fulfil society's expectations of surgeons. Other skills, which have been well defined in the published literature, include those of the professional, communicator, collaborator, manager, scholar and health advocate. It is the purpose of this review to explore the current understanding of these different domains and make comment about ways to improve training that will ensure that the surgeon of the future has the opportunity to develop broader expertize.

Evaluation of a virtual reality simulator for arthroscopy skills development

We evaluated a virtual reality shoulder arthroscopy simulator using a standardized skills-assessment algorithm in 3 specific groups with various degrees of surgical expertise. The simulator (Mentice Corp, Gothenberg, Sweden) consists of a computer-based, dual-force feedback system with video monitor. Modeled structures include cartilage, labrum, ligaments, biceps tendon, and rotator cuff. The study included 3 groups of volunteers: group 1, medical students interviewing for orthopaedic residency (n = 35); group 2, orthopaedic residents interviewing for sports medicine fellowship (n = 22); and group 3, experienced faculty at a shoulder surgery course (n = 21). Data were collected anonymously and subjects completed a standardized test protocol designed to assess accuracy and efficiency. Subjects used the probe to "touch" a sphere that appeared at various locations within the joint (11 positions total). The sphere changed location immediately on contact with the tip of the probe. The following parameters were calculated by the computer: time (from touching the first ball until touching the eleventh ball), path ratio (percent of measured path length relative to the ideal path), collisions (number of times the probe / arthroscope contacted any tissue), and injuries (collisions beyond a threshold force). Test time and path ratio differed significantly as a function of surgical experience. There was no significant difference in probe collisions between the groups. Arthroscope collisions and injuries averaged 2 or less in all of the groups. There was significant correlation between path ratio and time to complete the test in groups 1 and 2 (r =.527 and r =.827, respectively, P <.001), but not in group 3 (r =.376, P =.10). There was essentially normal distribution of time performance in groups 1 and 2. Time was shorter and more consistent in group 3, suggesting greater consistency in the experienced surgeons. These data suggest that this arthroscopy simulator facilitates discrimination of arthroscopic skills. Computer-based simulation technology provides a major opportunity for surgical skills development without morbidity and operating room inefficiency.