Open surgical simulation--a review

Moving skills training closer to application: In-rotation skills curriculum is feasible and effective

PURPOSE

Using simulation can help surgical trainees acquire surgical skills but at the expense of clinical learning time. We postulate an in-rotation skills curriculum is feasible and minimizes time away from clinical experiences.

METHODS

Surgical residents (PGY2-5) were allotted two hours of weekly protected time for rotation specific simulation modules that included assessment, mentoring, and practice. Between September 2015 and February 2016 performance data was collected and participants were surveyed.

RESULTS

Completion rates of 87-100% were achieved and post-test scores improved significantly, indicating improved performance. The survey (29/30 RR) revealed that 81.5% felt 2 hours a week was 'just right' and 79.3% agreed or strongly agreed the in-rotation aspect was a benefit. Improved confidence in the OR was reported by 86.2% of residents Intra-operative skill was self-assessed as improved in 79.3%.

CONCLUSION

In-rotation skills curriculum with high completion rates is feasible and allows training in close proximity to clinical application. Performance in the simulated environment significantly improved with corresponding improvements in confidence and self-assessed skill in the operating room.

Can hyper-realistic physical models of peripheral vessel exposure and fasciotomy replace cadavers for performance assessment?

BACKGROUND

Work-hour restrictions have reduced operative experience for residents. The Advanced Surgical Skills for Exposure in Trauma (ASSET) course fills this training gap. Cadaver use has limitations including cost and availability. Hyper-realistic synthetic models may provide an alternative to cadavers. We compared same surgeon performance between synthetic and cadaveric models to determine interchangeability for formative evaluation.

METHODS

Forty residents (<4 weeks after ASSET) and 35 faculty (mean, 2.5 ± 1.3 years after ASSET) exposed axillary, brachial, and femoral arteries, and performed lower extremity fasciotomy. Separate evaluators and random starting order between models were used for participants. Individual procedure scores and aggregate procedure scores, a trauma readiness index, evaluated participants. Student's t and χ tests were used where appropriate. p Values less than 0.05 were considered significant.

RESULTS

For same surgeons, faculty, but not residents, had higher trauma readiness index on the synthetic model (0.63 vs. 0.70, p < 0.01; 0.63 vs. 0.67, p = 0.06, respectively). Scores were not significantly different between models for residents except for the brachial artery exposure (0.68 vs. 0.75, p < 0.01), which was the least realistic of all procedures. Faculty did significantly better on the synthetic model in all procedures. All participants completed procedures nearly twice as quickly (5.61 ± 3.21 vs. 10.08 ± 4.66 minutes) and performed fewer errors on the synthetic model (113 vs. 53, p < 0.01; 118 vs. 76, p = 0.03, respectively).

CONCLUSION

Same surgeons performed procedures quicker and with fewer errors on the synthetic model. Residents performed similarly on both model types, this likely represents the unfamiliarity neophytes bring to new procedures. This suggests that the synthetic model, with easily discernible and standardized anatomy, may be useful in the early stages of training to understand critical procedural steps. The difficulty of the cadaver is more apt to assess and evaluate the experienced surgeon and identify opportunities for improvement.

LEVEL OF EVIDENCE

Prognostic, level III.

Simulation Training for Vascular Emergencies in Endoscopic Sinus and Skull Base Surgery

Carotid artery injury during endonasal surgery is a feared and potentially catastrophic complication. Simulation training provides the opportunity for a realistic experience with management of major vascular injuries. The sheep model of carotid artery injury reproduces the challenges of dealing with vascular emergencies during endoscopic sinus and skull base surgery, which include working in narrow nasal confines, high-flow/high-pressure vascular injury, and the immediately challenging surgical field. Simulated vascular emergencies allow for research and development; training using various surgical techniques to control the field, including hemostatic products or direct vascular closure techniques; and consequently improved patient care and outcomes.

Video Coaching as an Efficient Teaching Method for Surgical Residents-A Randomized Controlled Trial

BACKGROUND

As surgical training is evolving and operative exposure is decreasing, new, effective, and experiential learning methods are needed to ensure surgical competency and patient safety. Video coaching is an emerging concept in surgery that needs further investigation.

DESIGN

In this randomized controlled trial conducted at a single teaching hospital, participating residents were filmed performing a side-to-side intestinal anastomosis on cadaveric dog bowel for baseline assessment. The Surgical Video Coaching (SVC) group then participated in a one-on-one video playback coaching and debriefing session with a surgeon, during which constructive feedback was given. The control group went on with their normal clinical duties without coaching or debriefing. All participants were filmed making a second intestinal anastomosis. This was compared to their first anastomosis using a 7-category-validated technical skill global rating scale, the Objective Structured Assessment of Technical Skills. A single independent surgeon who did not participate in coaching or debriefing to the SVC group reviewed all videos. A satisfaction survey was then sent to the residents in the coaching group.

SETTING

Department of Surgery, HôpitalMaisonneuve-Rosemont, tertiary teaching hospital affiliated to the University of Montreal, Canada.

PARTICIPANTS

General surgery residents from University of Montreal were recruited to take part in this trial. A total of 28 residents were randomized and completed the study.

RESULTS

After intervention, the SVC group (n = 14) significantly increased their Objective Structured Assessment of Technical Skills score (mean of differences 3.36, [1.09-5.63], p = 0.007) when compared to the control group (n = 14) (mean of differences 0.29, p = 0.759). All residents agreed or strongly agreed that video coaching was a time-efficient teaching method.

CONCLUSIONS

Video coaching is an effective and efficient teaching intervention to improve surgical residents' technical skills.

Management of arterial injury during endoscopic sinus and skull base surgery

PURPOSE OF REVIEW

The most feared complication during endonasal surgery is a carotid artery injury. The sheep model of carotid injury provides training for this event by giving a realistic endoscopic experience of major vascular injuries and tissue hemostasis.

RECENT FINDINGS

The sheep model of carotid artery injury recreates the narrow nasal confines and high-flow/high-pressure vascular injury accurately reproducing the endoscopic challenges seen in such vascular emergencies. This has led to the development of surgical techniques that quickly and effectively control the field of bleeding and achieve reliable hemostasis including the crushed muscle patch new direct vascular closure technologies. Vascular emergency simulation training is achieving better outcomes for our patients.

SUMMARY

All skull base surgeons are at risk of the unexpected carotid artery injury and recently, the sheep model not only effectively recreates this situation but has identified clinically tried and tested techniques at managing this situation and is improving patient outcomes.

Dual Endoscopic Endonasal Transsphenoidal and Precaruncular Transorbital Approaches for Clipping of the Cavernous Carotid Artery: A Cadaveric Simulation

Background Endoscopic skull base approaches are being used to address complicated neurovascular pathology. These approaches are safest when proximal vascular control of the cavernous carotid artery (CavCA) can be obtained. Methods We present a cadaver-based anatomic simulation study showing the feasibility of clip placement for the CavCA as it courses through the cavernous sinus. The arterial vessels were injected with red microfil (Flow Tech, Carver, Massachusetts) to enhance visibility. The endoscope was directed through a precaruncular transorbital approach and instrumentation was managed through an endonasal transsphenoidal approach. Results The dual approach minimized the "coning down" and instrument "sword fighting" that occurs as the rod lens endoscope and instruments are used laterally and posterior toward the clivus and brainstem. The precaruncular transorbital approach improved visualization of the clip application and improved the functional working area. The transorbital port allowed better appreciation of the distal clip tines, and the laterally positioned cranial nerves. Conclusions The advantages may be most realized in the setting of endoscopic endonasal resection of highly vascular lesions and/or bleeding from a ruptured aneurysm being clipped. Simulated training provides an excellent opportunity to enhance skill sets and increase familiarity with anatomical visualization before entering the operative arena.

Surgical Hand Tracking in Open Surgery Using a Versatile Motion Sensing System: Are We There Yet?

With changes in work hour limitations, there is an increasing need for objective determination of technical proficiency. Electromagnetic hand-motion analysis has previously shown only time to completion and number of movements to correlation with expertise. The present study was undertaken to evaluate the efficacy of hand-motion-tracking analysis in determining surgical skill proficiency. A nine-degree-of-freedom sensor was used and mounted on the superior aspect of a needle driver. A one-way analysis of variance and Welch's t test were performed to evaluate significance between subjects. Four Novices, four Trainees, and three Experts performed a large vessel patch anastomosis on a phantom tissue. Path length, total number of movements, absolute velocity, and total time were analyzed between groups. Compared to the Novices, Expert subjects exhibited significantly decreased total number of movements, decreased instrument path length, and decreased total time to complete tasks. There were no significant differences found in absolute velocity between groups. In this pilot study, we have identified significant differences in patterns of motion between Novice and Expert subjects. These data warrant further analysis for its predictive value in larger cohorts at different levels of training and may be a useful tool in competence-based training paradigms in the future.

Objective Surgical Skill Assessment: An Initial Experience by Means of a Sensory Glove Paving the Way to Open Surgery Simulation?

INTRODUCTION

Simulation and training in surgery are very promising tools for enhancing a surgeon's skill base. Accurate tracking of hand movements can be a strategy for objectively gauging a surgeon's dexterity, although "open" work is much more difficult to evaluate than are laparoscopic tasks. To the authors' knowledge, a system taking into account the movements of each finger joint has never been applied to open surgery simulation. This work intends to make up for this shortcoming and to perform a data analysis of the surgeon's entire gesture.

MATERIALS AND METHODS

The authors developed a sensory glove to measure flexion/extension of each finger joint and wrist movement. Totally 9 experts and 9 novices performed a basic suturing task and their manual performances were recorded within 2 days of measurements. Intraclass correlation coefficients were calculated to assess the ability of the executors to repeat and reproduce the proposed exercise. Wilcoxon signed-rank tests and Mann-Whitney U-tests were used to determine whether the 2 groups differ significantly in terms of execution time, repeatability, and reproducibility. Finally, a questionnaire was used to gather operators' subjective opinions.

RESULTS

The experts needed a similar reduced execution time comparing the 2 recording sessions (p = 0.09), whereas novices spent more time during the first day (p = 0.01). Repeatability did not differ between the 2 days, either for experts (p = 0.26) or for novices (p = 0.86). The 2 groups performed differently in terms of time (p < 0.001), repeatability (p = 0.01), and reproducibility (p < 0.001) of the same gesture. The system showed an overall moderate repeatability (intraclass correlation coefficient: experts = 0.64; novices = 0.53) and an overall high reproducibility. The questionnaire revealed performers' positive feedback with the glove.

CONCLUSIONS

This initial experience confirmed the validity and reliability of the proposed system in objectively assessing surgeons' technical skill, thus paving the way to a more complex project involving open surgery simulation.

Cerebrospinal fluid reconstitution via a perfusion-based cadaveric model: feasibility study demonstrating surgical simulation of neuroendoscopic procedures

Cadaveric surgical simulation carries the advantage of realistic anatomy and haptic feedback but has been historically difficult to model for intraventricular approaches given the need for active flow of CSF. This feasibility study was designed to simulate intraventricular neuroendoscopic approaches and techniques by reconstituting natural CSF flow in a cadaveric model. In 10 fresh human cadavers, a simple cervical laminectomy and dural opening were made, and a 12-gauge arterial catheter was introduced. Saline was continuously perfused at physiological CSF pressures to reconstitute the subarachnoid space and ventricles. A neuroendoscope was subsequently inserted via a standard right frontal bur hole. In 8 of the 10 cadavers, adequate reconstitution and endoscopic access of the lateral and third ventricles were achieved. In 2 cadavers, ventricular access was not feasible, perhaps because of a small ventricle size and/or deteriorated tissue quality. In all 8 cadavers with successful CSF flow reconstitution and endoscopic access, identifying the foramen of Monro was possible, as was performing septum pellucidotomy and endoscopic third ventriculostomy. Furthermore, navigation of the cerebral aqueduct, fourth ventricle, prepontine cistern, and suprasellar cistern via the lamina terminalis was possible, providing a complementary educational paradigm for resident education that cannot typically be performed in live surgery. Surgical simulation plays a critical and increasingly prominent role in surgical education, particularly for techniques with steep learning curves including intraventricular neuroendoscopic procedures. This novel model provides feasible and realistic surgical simulation of neuroendoscopic intraventricular procedures and approaches.

A 4-task skills examination for residents for the assessment of technical ability in hand trauma surgery

OBJECTIVES

The aim of this study was to evaluate a 4-task skills examination model for surgical trainees as a method of assessment of the different technical skills essential in hand trauma surgery.

DESIGN

Using established validation methodology, construct validity was assessed by comparing the performance of 2 groups of residents in surgery (group A: residents with any formation in microsurgery and hand surgery and group B: residents with specific formation in hand or microsurgery or both).

PARTICIPANTS AND SETTING

Overall, 19 residents in surgery with different degree of formation in hand and microsurgery participated in the study. All the residents performed 4 tasks on synthetic models consecutively: task 1-Z-plasty, task 2-metacarpal fracture fixation, task 3-tendon repair, and task 4-end-to-end anastomosis. The running order was awarded in a random drawing and 4 independent observers scored each resident.

RESULTS

There was a significant difference in performance in the overall score between groups A and B and particularly for tasks 1 and 4. All participants felt the 4 tasks were good models to learn the procedure and recommended this approach to younger residents.

CONCLUSION

This approach was based on a 4-tasks examination is the first model of evaluation of the different technical skills required for hand trauma surgery for residents. The results show a good differentiation between residents that have microsurgical and hand formation and those who do not have. This easy model can be easily integrated in the curriculum of residents, who want to specialize in hand surgery.

An inexpensive yet realistic model for teaching vasectomy

PURPOSE

Teaching the no-scalpel vasectomy is important, since vasectomy is a safe, simple, and cost-effective method of contraception. This minimally invasive vasectomy technique involves delivering the vas through the skin with specialized tools. This technique is associated with fewer complications than the traditional incisional vasectomy (1). One of the most challenging steps is the delivery of the vas through a small puncture in the scrotal skin, and there is a need for a realistic and inexpensive scrotal model for beginning learners to practice this step.

MATERIALS AND METHODS

After careful observation using several scrotal models while teaching residents and senior trainees, we developed a simplified scrotal model that uses only three components-bicycle inner tube, latex tubing, and a Penrose drain.

RESULTS

This model is remarkably realistic and allows learners to practice a challenging step in the no-scalpel vasectomy. The low cost and simple construction of the model allows wide dissemination of training in this important technique.

CONCLUSIONS

We propose a simple, inexpensive model that will enable learners to master the hand movements involved in delivering the vas through the skin while mitigating the risks of learning on patients.

Perceived effects of the 16-hour workday restriction on surgical specialties: Quebec's experience

OBJECTIVE

Quebec was the first Canadian province to implement a 16-hour workday restriction. Our aim was to assess and compare Quebec's surgical residents' and professors' perception regarding the effects on the educational environment, quality of care, and quality of life.

DESIGN

The Surgical Theater Educational Environment Measure, the Postgraduate Hospital Educational Environment Measure, quality of the medical act, and quality-of-life questionnaires were administered 6 months after the work-hour restrictions.

SETTING

Université de Montréal Surgery Department, Montréal, Québec, Canada; Université de Sherbrooke Surgery Department, Sherbrooke, Québec, Canada; Université Laval Surgery Department, Québec, Québec, Canada; and McGill University Surgery Department, Montréal, Québec, Canada.

PARTICIPANTS

Surgical residents and professors of all specialties within the 4 university surgery departments in Quebec through a voluntary web-based survey.

RESULTS

A total of 280 questionnaires were analyzed with response rates of 29.7% and 16.4% for residents and professors, respectively. Data were coded on a scale from 2 (strong improvement perception) to -2 (strong deterioration perception). The professors perceived a higher negative effect than the residents did on the educational environment, i.e., role of autonomy (-0.399 vs. -0.577, p < 0.001), teaching (-0.496 vs. -0.540, p < 0.001), social support (-0.345 vs. -0.535, p < 0.001), and surgical learning (-0.409 vs. -0.626, p < 0.001). The professors also observed a higher negative effect on patients' safety (-0.199 vs. -0.595, p = 0.003) and quality of care (-0.077 vs. -0.421, p = 0.014). The latter was even perceived as unchanged by residents (-0.077, 95% CI: -0.249 to 0.095). The residents perceived a negative effect on their quality of life, whereas the professors believed the contrary (0.500 vs -0.496, p < 0.001). More professors than residents believed residency should be prolonged (80.8% vs. 50.6%, p < 0.001).

CONCLUSIONS

Residents and professors perceive a mild negative effect on the educational environment and quality of care, whereas their perception on quality of life is opposite. The professors seem concerned about adequate training to the point of considering increasing training length.

Abdominal injuries in a low trauma volume hospital--a descriptive study from northern Sweden

BACKGROUND

Abdominal injuries occur relatively infrequently during trauma, and they rarely require surgical intervention. In this era of non-operative management of abdominal injuries, surgeons are seldom exposed to these patients. Consequently, surgeons may misinterpret the mechanism of injury, underestimate symptoms and radiologic findings, and delay definite treatment. Here, we determined the incidence, diagnosis, and treatment of traumatic abdominal injuries at our hospital to provide a basis for identifying potential hazards in non-operative management of patients with these injuries in a low trauma volume hospital.

METHODS

This retrospective study included prehospital and in-hospital assessments of 110 patients that received 147 abdominal injuries from an isolated abdominal trauma (n = 70 patients) or during multiple trauma (n = 40 patients). Patients were primarily treated at the University Hospital of Umeå from January 2000 to December 2009.

RESULTS

The median New Injury Severity Score was 9 (range: 1-57) for 147 abdominal injuries. Most patients (94%) received computed tomography (CT), but only 38% of patients with multiple trauma were diagnosed with CT < 60 min after emergency room arrival. Penetrating trauma caused injuries in seven patients. Solid organ injuries constituted 78% of abdominal injuries. Non-operative management succeeded in 82 patients. Surgery was performed for 28 patients, either immediately (n = 17) as result of operative management or later (n = 11), due to non-operative management failure; the latter mainly occurred with hollow viscus injuries. Patients with multiple abdominal injuries, whether associated with multiple trauma or an isolated abdominal trauma, had significantly more non-operative failures than patients with a single abdominal injury. One death occurred within 30 days.

CONCLUSIONS

Non-operative management of patients with abdominal injuries, except for hollow viscus injuries, was highly successful in our low trauma volume hospital, even though surgeons receive low exposure to these patients. However, a growing proportion of surgeons lack experience in decision-making and performing trauma laparotomies. Quality assurance programmes must be emphasized to ensure future competence and quality of trauma care at low trauma volume hospitals.

A model of cardiopulmonary bypass staged training integrating technical and non-technical skills dedicated to cardiac trainees

OBJECTIVES

To develop a standardized simulation-based curriculum to teach medical knowledge and technical, communication and critical thinking skills necessary to initiate and wean from cardiopulmonary bypass (CPB) to junior cardiac trainees (CTs) in France. Performance on post-curricular tests was compared between CTs who participated in the new curriculum to those who did not.

METHODS

The simulation-based curriculum was developed by content and education experts. Simulations sequentially taught the skills necessary for initiating and weaning from CPB as well as managing crises by adding fidelity and complexity to scenarios. Nine CTs were randomly assigned to the new curriculum (n=5) or the traditional curriculum (n=4). Skills were assessed using tests of medical knowledge and technical, communication (GRS) and critical thinking (SCT) skills. A two-sample Wilcoxon rank-sum test compared average scores between the two groups. Alpha of 0.05 was set to indicate statistically significant differences.

RESULTS

The resutls revealed that CTs in the new curriculum significantly outperformed CTs in the traditional curriculum on technical (18.2 vs 14.8, p=0.05) and communication (3.5 vs 2.2, p=0.013) skills. There was no significant difference between CTs in the new curriculum in the Script Concordance Test (16.5 vs 14.8, p=0.141) and knowledge tests (26.9 vs 24.6, p=0.14) compared to CTs in the traditional curriculum.

CONCLUSION

Our new curriculum teaches communication and technical skills necessary for CPB. The results of this pilot study are encouraging and relevant. They give grounds for future research with a larger panel of trainees. Based on the current distribution of scores, a sample size of 12 CTs per group should yield significant results for all tests.