Abdominal wall closure: resident education and human error

Educating Residents in Abdominal Wall Closure: An Overview

Background and Aims: Incisional hernia prevention has become an important concept for surgeons operating on the abdominal wall. Several techniques have been proposed to help decrease incisional hernia formation with suture closure of the abdominal wall being one of the cornerstones. Technical details that have been reported to decrease incisional hernia rates include achieving a 4:1 Suture to Wound length ratio and the use of a small bites technique. Despite evidence to support many of these techniques there appears to be a gap in practice patterns amongst practicing surgeons. Introducing and promoting these principles in surgical residency may help to close this gap. This paper reviews our experience with surgical training for abdominal wall closures at our institution. Materials and Methods: Programs and projects related to abdominal wall closure were reviewed from our institution from 2010-Present. Type of project, intervention, and impact on education was evaluated and summarized. Results: Seven projects were identified relating to surgical training and abdominal wall closure. Three projects dealt with skills training using an abdominal wall simulation model and related to suturing techniques. Two projects were clinical studies focused on suture to wound length ratios and improving outcomes with this variable in a residency training program. Two projects dealt with models relating to abdominal wall closure and education. Conclusion: Implementation of educational programs in surgical residency programs can lead to improvements in technique and knowledge around abdominal wall closure and help in research endeavors.

Teaching Small Bite Fascial Closure Technique: Improved Accuracy and Consistency Through Simulation

Despite evidence that small bite closure is beneficial, it is not well documented how accurately and consistently surgeons employ this technique. We created a felt model to simulate fascial closure and educate residents regarding small bites. This study aims to gauge accuracy and consistency of bite size in fascial closure and assess if utilizing a templated model could improve technique. Two 10 cm incisions were made in different pieces of felt. Residents were instructed to suture the incisions to simulate fascial closure by running the incisions closed with 1 cm and 5 mm bites respectively. The process was repeated with templated pieces of felt marking 1 and 0.5 cm to guide bite size. Residents were timed for each closure. The travel and distance from the midline for each bite was measured and analysis performed. 14 residents participated. Paired T-test compared means and standard deviations of bite size. Taking 5 mm bites took more time. Standard deviation of travel and right sided distance from midline were significantly smaller when a template was utilized. Standard deviation of travel as well as right sided distance was also improved when instructed to take 5 mm bites. This study demonstrates that a small bite technique results more closure and that when residents are instructed to take smaller bites. The adage, "aim small, miss small," holds true in fascial closure and may be one reason why small bites improve hernia rates. This study also suggests that the use of a template improves accuracy and consistency of closure regardless of bite size intention.

Decreasing Incisional Hernia by Teaching 4:1 Suture to Wound Length Ratio Early in Surgical Education

OBJECTIVE

Incisional hernia formation has become a major burden for our healthcare system. One factor that has been shown to reduce incisional hernia rates that can be impacted on by the surgeon is the ability to achieve a 4:1 suture to wound length ratio. The purpose of this study is to evaluate whether a focused educational program for surgical residents can help improve laparotomy closures and be successful in achieving 4:1 suture to wound length ratios.

DESIGN

Following Institutional Review Board approval, consecutive abdominal wall closures were reviewed from December 2013 to July 2016. S:W length ratios were calculated in all cases and after 100 cases a formal audit of success and risk factors for not achieving a 4:1 ratio was performed followed by a formal resident education on laparotomy closure. The ability to achieve a 4:1 ratio for the first 100 cases following resident education was then compared to the 100 patients preceding the education with a p-value of <0.05 considered significant.

RESULTS

Two hundred patients underwent midline laparotomy with S:W length ratio calculated. In the first 100 patients, 76% of patients received a 4:1 S:W closure. Following resident education, this improved to 90% in the second 100 patients (p = 0.0083). Among patients where 2 residents performed the abdominal closure, 50% got an adequate 4:1 closure. This improved to 92% for the second 100 patients (p = 0.016).

CONCLUSION

A 4:1 S:W length ratio is a simple technique that has been proven to decrease incisional hernia. It requires no additional cost and can easily be implemented into practice. The act of formal resident education and measuring suture tails to calculate a S:W ratio on each case holds surgeons accountable and improves success rate of achieving a 4:1 ratio.

Small bites technique for midline laparotomy closure: From theory to practice: Still a long way to go

BACKGROUND

The closure technique of the abdominal wall is a key factor in the development of incisional hernia. Our aim was to implement a protocol for closure of median laparotomy, to evaluate the grade of implementation, as well as to assess the results and safety of the technique.

METHODS

A series of formative activities to implement the small bites technique for closure of median laparotomy in elective operations were designed. After 1 year, a survey was conducted on knowledge and use of the technique. Prospective compilation of data of all median laparotomy in elective operations and their follow-up was done for 1 year. The incidence of incisional hernia depending on the fulfilment of the protocol was compared.

RESULTS

A total of 74 surgeons participated in the activities. All the participants accomplished the technique perceiving low difficulty (1.9/10). After 1 year, 44 surgeons answered the survey; 95% stated that they knew the small bites technique and used it always or almost always, but only 52% performed the calculation of the suture length and the incision length ratio. A total of 114 median laparotomy in elective operations were analyzed; among them, 30.7% were closed with small bites presenting a lower frequency of incisional hernia and burst abdomen (small bites 3.6% vs large bites 12.1%; odds ratio 1.30; confidence interval, 0.992--1.711; P = .20).

CONCLUSION

The measures were effective for learning, but education alone was not enough to implement the technique in the real scenario. Small bites technique is reproducible, has no risks, and provides low incidence of incisional hernia. More incentives and actions are needed to improve laparotomy closure.

Towards Development of an Open Surgery Competency Assessment for Residents (OSCAR) Tool - A Systematic Review of the Literature and Delphi Consensus

OBJECTIVE

Competency-based education has mandated accurate intra-operative assessment tools. We aimed to define consensus-based open surgical skills perceived by experts as critical for assessment.

DESIGN

A mixed-method design was employed: systematic review and e-Delphi methodology.

SETTING

The study was performed at McGill University-affiliated large tertiary academic centers in Montreal, Quebec, Canada.

PARTICIPANTS

Per PRISMA guidelines, a peer-reviewed search strategy was employed. Studies published in English and those describing technical skill assessment of open abdominal surgery were included; subspecialty-specific skills, conference abstracts, academic memoirs were excluded. Most-cited skills were subjected to e-Delphi methodology to identify those deemed essential by experts, based a 3-point Likert scale. Eighteen McGill University-affiliated general surgeons, representing a variety of subspecialties of General Surgery, were invited to answer the questionnaire.

RESULTS

Around 120 of 4285 references were retained for analysis. The 12 most cited skills included suturing, tissue and instrument handling, movement economy, instrument knowledge, knot tying, flow, knowledge of procedure, completion time, dissection technique, knowledge of anatomy and sterile technique; 6 of these achieved high or perfect scores and agreement after 2 rounds of survey: suturing, sterile technique, knot tying, knowledge of anatomy, knowledge of procedure, and tissue handling. Median standard deviation decreased (0.495 to 0.450) from first to second round, indicating improvement in consensus.

CONCLUSION

These results will help develop and validate the OSCAR (objective structured clinical assessment rubric) assessment tool for immediate intra-operative feedback of open technical skills for surgical trainees.

[Analysis of the causes of recurrent postoperative ventral hernias]

OBJECTIVE

To study the causes of recurrent postoperative ventral hernias and methods for their prevention.

MATERIAL AND METHODS

There were 58 patients with recurrent postoperative ventral hernias after various methods of abdominal wall repair for the period 2005-2017.

RESULTS

The main causes of recurrent postoperative ventral hernias were identified. Local tissue rearrangement resulted recurrent hernia in 21 (36.2%) patients, that was observed even in patients with small hernia. Size discrepancy between endoprosthesis and hernial orifice caused a recurrence in 20 (34.5%) patients. In 11 (19%) patients, implant detachment followed by recurrent hernia occurred. Postoperative wound complications followed by recurrent hernia were diagnosed in 6 (10.3%) patients. Non-compliance with recommendations for wearing a bandage and restricting physical exertion also contributed to the development of recurrent hernia. Moreover, recurrent hernia occurred mainly in obese patients. Mean body mass index was 34.27±2.2 kg/m². Recurrent hernia was again detected in 12 out of 35 patients in long-term period after surgical treatment.

CONCLUSION

It is necessary to abandon local tissue rearrangement and to select a correct size of synthetic material for prevention of recurrent postoperative hernia. Preoperative body weight control is essential in patients with obesity. Wearing a bandage and restricting physical exertion are obligatory in postoperative period. Annual examination during 3-5 years after surgery is essential for timely diagnosis of recurrent hernia.

Effect of Surgical Expertise on Biomechanical Properties of Sutures After Abdominal Wall Closure

BACKGROUND

Despite preventive methods and careful surgical technique, surgical site infection and incisional hernias are of main concern after the closure of surgical incisions and keep haunting abdominal wall wound healing. The aim of this study is to find how surgical expertise level modifies biomechanical properties of sutures commonly used in abdominal wall fascial closure (polypropylene, polyglactin 910, polydioxanone).

MATERIALS AND METHODS

Surgery residents with different experience levels performed abdominal wall fascial closure in swine models with the previously mentioned suture materials. A standardized technique was used. Sutures were removed, and a tensile stress test was performed on the removed sutures. A total of 81 abdominal fascial closures were achieved. Time, extension, maximum tensile force (F_tmax), and maximum stress were measured and analyzed.

RESULTS

The results of the polydioxanone stress test present a trend in three variables: extension, tensile force, and stress. The trend shows higher medians in the expert group and lower medians in the novice group. While using polypropylene sutures, medians in the expert group are the highest; however, a trend is not observed. Polyglactin 910 sutures have nonspecific behavior among the different experience groups and variables. Polypropylene is the material with the lowest F_tmax tested and fails at 42.64 (IQR 40.98-44.89) N. Regarding the elastic properties of the material, polyglactin demonstrates the least extension of all sutures tested, with a 14 (IQR 13.33-14.83) mm extension. This study demonstrates that polydioxanone has a superior F_tmax compared with polypropylene and has a superior extension at failure properties compared with polyglactin, confirming that polydioxanone could be the suture of choice used for abdominal wall fascial closure.

CONCLUSIONS

Study results do not show statistically significant differences regarding the impact of the experience level of different general surgery residents in the biomechanical properties of sutures used in abdominal wall fascial closure.

Suture length to wound length ratio in 175 small animal abdominal midline closures

Experimental and human studies have reported the advantages of a suture length to wound length (SL:WL) ratio greater than 4:1 in midline abdominal closure. This is achieved when the tissue bite (TB) is equal to or larger than the stitch interval (SI). Although TB and SI values are recommended in some textbooks, SL:WL ratios are rarely reported in veterinary textbooks. Additionally, no clinical data regarding these parameters could be found in small animals. Therefore, the aim of this study was to evaluate the SL:WL ratio of midline laparotomy closure in dogs and cats performed by surgeons with different levels of expertise and to compare the findings with current textbook recommendations. Midline laparotomy incisions of 100 dogs and 75 cats were closed in continuous pattern by diplomates and residents of both the European College of Veterinary Surgeons (ECVS) and the European College of Animal Reproduction (ECAR). The mean SL:WL ratio was 2.5 ± 0.7:1. The surgeons´ level of experience and the species and body weights of the animals did not have any significant influence on the SL:WL ratio. A moderate negative correlation was observed between the mean SI to mean TB (SI:TB) ratio and the SL:WL ratio. In this study, the mean SI matched the textbook recommendations both in feline and canine species, whereas the TB in cats was different. In this study, the SL:WL ratio was less than 4:1 without apparent complications. Because of the low prevalence of incisional hernia in dogs and cats larger studies are necessary to evaluate clinical significance of the presented data.

Elective and emergent laparotomy closure: The importance of protocolizing the technique

BACKGROUND

Incisional hernias are a frequent complication, and their prevention includes proper closure of the abdominal wall.

METHODS

A prospective study was conducted at a third-level hospital after the introduction of a midline laparotomy closure protocol. An objective measurement of the suture length to incision length ratio was made. and the postoperative results were analyzed.

RESULTS

127 patients were included and 34 of them (26.8%) had received a technically deficient closure. Incisional hernia was described in 20.5% of cases. An improvement in the quality of the abdominal wall closure was demonstrated over time.

CONCLUSION

The abdominal wall closure was deficient in nearly one- quarter of the laparotomies performed at a third-level medical center. A protocol improved the quality of the laparotomy closure.

Frozen-thawed Abdominal Flap Remnant as an education material for a Medium Group Surgical Skills Education Workshop

Purpose

Residents' duty-hour regulations and the evolution of minimally invasive surgical techniques require more effective and efficient surgical skill teaching models. We used frozen-thawed human tissue remnants harvested during abdominoplasty or abdominal tissue-based breast reconstruction to allow for a medium-sized group workshop program, simulating a realistic surgical environment and visual/haptic feedback.

Methods

Full-thickness abdominal tissue (skin and subcutaneous fat) were donated from patients who underwent autologous breast reconstruction and gave consent to use their tissue for comprehensive research and medical educational purposes. Anonymized tissue was frozen-preserved and then thawed the day of the surgical skills workshop. A total of 53 residents completed 50-minute hands-on training in 3-to-5 person modules in four sessions of the workshop program.

Results

Thawed tissue regained almost normal texture and consistency. Structural integrity was also histologically confirmed. All participants were generally satisfied with the program, especially regarding the suture material provided.

Conclusion

Frozen-thawed tissue remnants from abdominoplasty or autologous breast reconstruction could be preserved and used as a suture education material in medium-group workshops for surgery residents or medical students given anonymity and with proper consent guaranteed. This approach provided an excellent model maintaining relatively real anatomic structure and consistency with minimal cost.

[Results of a national survey on abdominal wall closure]

OBJECTIVE

To assess knowledge on the abdominal wall closure through a surgeon cohort survey.

METHODS

A twenty question individual questionnaire on laparotomy in elective surgery.

RESULTS

A total of 131 surgeons from seven hospitals responded (72% specialists and 28% in training). 71% of respondents estimated the frequency of incisional hernia to be higher than 15% and 54% considered the technique to be the most significant risk factor. 85% considered midline laparotomy closed with slow absorbable suture (57%) in a single layer (66%) to be the most appropriate technique. 67% believed retention sutures to be the appropriate prevention technique. 50% did not know or could not apply the 4:1 technique. 87% considered that an incisional hernia can be prevented and that the technique is the most important factor on which to act. 84% believed that a prosthesis can prevent the occurrence of incisional hernia, whereas 40% of respondents never use it and only 38% use it in patients at risk. On comparing surveys between specialists and residents, significant differences appeared in terms of a better understanding of the theoretical technical aspects in trainee surgeons.

CONCLUSIONS

Although the results show an adequate understanding of the epidemiology and risk factors for development of incisional hernia, training and consensus measures are likely to be introduced in some basic technical aspects in order to improve results in laparotomy closure.

An evaluation of hernia education in surgical residency programs

PURPOSE

The purpose of this study was to evaluate surgical residents' educational experience related to ventral hernias.

METHODS

A 16-question survey was sent to all program coordinators to distribute to their residents. Consent was obtained following a short introduction of the purpose of the survey. Comparisons based on training level were made using χ(2) test of independence, Fisher's exact, and Fisher's exact with Monte Carlo estimate as appropriate. A p value <0.05 was considered significant.

RESULTS

The survey was returned by 183 residents from 250 surgical programs. Resident postgraduate year (PG-Y) level was equivalent among groups. Preferred techniques for open ventral hernia varied; the most common (32 %) was intra-abdominal placement of mesh with defect closure. Twenty-two percent of residents had not heard of the retrorectus technique for hernia repair, 48 % had not performed the operation, and 60 % were somewhat comfortable with and knew the general categories of mesh prosthetics products. Mesh choices, biologic and synthetic, varied among the different products. The most common type of hernia education was teaching in the operating room in 87 %, didactic lecture 69 %, and discussion at journal club 45 %. Number of procedures, comfort level with open and laparoscopic techniques, indications for mesh use and technique, familiarity and use of retrorectus repair, and type of hernia education varied significantly based on resident level (p < 0.05).

CONCLUSION

Exposure to hernia techniques and mesh prosthetics in surgical residency programs appears to vary. Further evaluation is needed and may help in standardizing curriculums for hernia repair for surgical residents.

[Training of residents in abdominal wall surgery in Spain]

The training of residents in abdominal wall surgery is a fundamental aspect of surgical training, representing globally 20% of its activity. In this paper, we analyze the current state of resident training in this kind of surgery in Spain, taking into account the broad spectrum it covers: general services, specific functional units, ambulatory surgery programs. To do this, based on the specifications of the specialty program, specific data were used from several different sources of direct information and a review of the results obtained by residents in hernia surgery. In general, our residents agree with their training and the recorded results are in line with objectives outlined in the program. However, it would be important to structure their teaching schedules, a rotation period in any specific unit and their involvement in outpatient surgery programs.