Surgical performance of large loop excision of the transformation zone in a training model: A prospective cohort study

Operator Sex and Experience Do Not Influence Conization Outcomes in Terms of Cone Volume, Depth or Resection Margins

BACKGROUND/AIM

Conization in patients with cervical intraepithelial neoplasia is associated with longer time required to conceive, a higher risk of preterm delivery, and a myriad of obstetric complications. This study assessed whether operator sex and experience correlate with cone volume, depth, and resection margins in patients wishing to conceive and the general patient population.

PATIENTS AND METHODS

This retrospective single center cohort study included 141 women who had undergone conization for cervical dysplasia in 2020 and 2021. Loop size selection was guided by the preoperative colposcopy report and intraoperative diluted Lugol staining. The hemiellipsoid cone volume was compared for subgroups in three categories: patients operated on by residents vs. board-certified gynecologists; patients operated on by female vs. male surgeons; patients who wished to pursue future pregnancy after conization vs. those who did not.

RESULTS

Female surgeons excised insignificantly less cervical tissue compared with their male counterparts (p=0.08). In the subgroup of patients without the wish to conceive, male surgeons tended to excise significantly bigger volumes during conization (p=0.008). No significant difference (p=0.74) regarding volume of resected tissue was evidenced when comparing residents to board-certified surgeons, both in patient subgroups with (p=0.58) and without (p=0.36) a wish to conceive. Male surgeons tended to resect higher volumes (p=0.012) if board-certified compared to their board-certified female colleagues.

CONCLUSION

There were insignificant differences regarding cone depth and volume or incomplete resection when stratified by operator experience and sex. However, male gynecologists removed significantly larger cone volumes in the subgroup of patients who did not pursue future pregnancy.

Evaluating a novel 3D printed model for simulating Large Loop Excision of the Transformation Zone (LLETZ)

Background

Electrosurgical excisions are common procedures for treating cervical dysplasia and are often seen as minor surgeries. Yet, thorough training of this intervention is required, as there are considerable consequences of inadequate resections, e.g. preterm birth, the risk of recurrence, injuries and many more. Unfortunately, there is a lack of sufficiently validated possibilities of simulating electrosurgeries, which focus on high fidelity and patient safety.

Methods

A novel 3D printed simulator for examination and electrosurgical treatment of dysplastic areas of the cervix was compared with a conventional simulator. Sixty medical students experienced a seminar about cervical dysplasia. Group A underwent the seminar with the conventional and Group B with the novel simulator. After a theoretical introduction, the students were randomly assigned by picking a ticket from a box and went on to perform the hands-on training with their respective simulator. Each student first obtained colposcopic examination training. Then he or she performed five electrosurgical excisions (each). This was assessed with a validated score, to visualize their learning curve. Furthermore, adequate and inadequate resections and contacts between electrosurgical loop and vagina or speculum were counted. Both groups also assessed the seminar and their simulator with 18 questions (Likert-scales, 1–10, 1 = strongly agree / very good, 10 = strongly disagree / very bad). Group B additionally assessed the novel simulator with four questions (similar Likert-scales, 1–10).

Results

Nine of 18 questions showed statistically significant differences favoring Group B (p < 0.05). Group B also achieved more adequate R0-resections and less contacts between electrosurgical loop and vagina or speculum. The learning curves of the performed resections favored the novel simulator of Group B without statistically significant differences. The four questions focusing on certain aspects of the novel simulator indicate high appreciation of the students with a mean score of 1.6 points.

Conclusion

The presented novel simulator shows several advantages compared to the existing model. Thus, novice gynecologists can be supported with a higher quality of simulation to improve their training and thereby patient safety.

Supplementary Information

The online version contains supplementary material available at 10.1186/s41205-022-00143-x.

Introducing a novel model for simulating large loop excision of the transformation zone (LLETZ) using 3D printing technique

Purpose

Electrosurgery is the gold-standard procedure for the treatment of cervical dysplasia. The quality of the outcome depends on the accuracy of performance, which underlines the role of adequate training of surgeons, especially, as this procedure is often performed by novice surgeons. According to our knowledge, medical simulation has up until now lacked a model, which focuses on realistically simulating the treatment of cervical dysplasia with the concerning anatomy.

Methods and result

In our work, we present a model created using 3D printing for holistically simulating diagnostic, as well as surgical interventions of the cervix, as realistically as possible.

Conclusion

This novel simulator is compared to an existing model and both are evaluated. By doing so, we aim to provide novice gynecologists with standardized and high-quality simulation models for practicing to improve their proficiency.

Objective structured assessment of technical skill in temporal bone dissection: validation of a novel tool

OBJECTIVE

This study developed an assessment tool that was based on the objective structured assessment for technical skills principles, to be used for evaluation of surgical skills in cortical mastoidectomy. The objective structured assessment of technical skill is a well-established tool for evaluation of surgical ability. This study also aimed to identify the best material and printing method to make a three-dimensional printed temporal bone model.

METHODS

Twenty-four otolaryngologists in training were asked to perform a cortical mastoidectomy on a three-dimensional printed temporal bone (selective laser sintering resin). They were scored according to the objective structured assessment of technical skill in temporal bone dissection tool developed in this study and an already validated global rating scale.

RESULTS

Two external assessors scored the candidates, and it was concluded that the objective structured assessment of technical skill in temporal bone dissection tool demonstrated some main aspects of validity and reliability that can be used in training and performance evaluation of technical skills in mastoid surgery.

CONCLUSION

Apart from validating the new tool for temporal bone dissection training, the study showed that evolving three-dimensional printing technologies is of high value in simulation training with several advantages over traditional teaching methods.

A standardized simulation training program to type 1 loop electrosurgical excision of the transformation zone: a prospective observational study

PURPOSE

To evaluate a simulation-based standardized training program for type 1 loop electrosurgical excision procedure (LEEP) under direct colposcopic vision in postgraduate teaching.

METHODS

Seventeen participants (five experienced and 12 novice surgeons) performed 170 simulated cervical excisional procedures. Each participant performed 10 type 1 (cone length between 8 and 10 mm) excisional procedures under direct colposcopic vision on a low-fidelity simulator. Length of specimen was measured after each excision allowing the surgeons a subsequent resection to ensure a cone length of more than 8 mm. Main outcome measures were cone length, specimen fragmentation, and a self-developed score (LEEP score), which allowed the simultaneous evaluation of both measured parameters.

RESULTS

The precision of the excision showed statistically significant improvement in the novice group during the training procedures after five procedures [LEEP score 1.61 (SD 1.34) vs. 0.46 (SD 0.58); p = 0.023], while experts showed consistently high performance. Inexperienced surgeons performed more frequently cuts that were too deep than experienced surgeons (33/120, 27.5% vs. 4/50, 8%; p = 0.003).

CONCLUSIONS

Low-fidelity simulation training seems to be an effective method for learning the accurate cone length for a type 1 excision for novice surgeons. As excessive excisions are related with high risk for premature delivery in subsequent pregnancies, in our opinion, LEEP should be practiced in simulation training, especially before performing in woman of reproductive age.

Loop electrosurgical excision procedure with or without intraoperative colposcopy: a randomized trial

BACKGROUND

Loop electrosurgical excision procedure is the standard surgical treatment for cervical dysplasia. Loop electrosurgical excision procedure is advised to be performed under colposcopic guidance to minimize adverse pregnancy outcomes. To date, there is no evidence from randomized trials for this recommendation.

OBJECTIVE

We sought to assess the benefits of performing loop electrosurgical excision procedure under colposcopic guidance in women with cervical dysplasia.

STUDY DESIGN

In a prospective, randomized trial, we compared loop electrosurgical excision procedure with loop electrosurgical excision procedure performed under direct colposcopic vision in a 1:1 ratio. The primary endpoint was resected cone mass; the secondary endpoints were margin status, fragmentation of the surgical specimen, procedure time, time to complete hemostasis, blood loss, and intraoperative and postoperative complications. A sample size of 87 per group (n = 174) was planned (with an assumed type I error of 0.05 and drop-out rate of 5%) to achieve 90% power to detect a 25% reduction in cone mass (with an assumed cone mass of 2.5 ± 1.6 g in the control group) using a nonparametric test (Mann-Whitney U).

RESULTS

From October 2016 through December 2017, we randomized 182 women: 93 in the loop electrosurgical excision procedure group and 89 in the loop electrosurgical excision procedure-direct colposcopic vision group. Women undergoing loop electrosurgical excision procedure-direct colposcopic vision had significantly smaller cone specimens than those undergoing loop electrosurgical excision procedure (weight: median 1.86 [interquartile range 1.20-2.72] vs median 2.37 [interquartile range 1.63-3.31] g, respectively, P = .006). Secondary outcome measures did not differ significantly between groups: resection margin status involved vs free margin: 12 (13%) vs 75 (82%) and 11 (12.4%) vs 75 (84.3%); fragmentation no vs yes: 85 (92.4%) vs 7 (7.6%) and 84 (94.4%) vs 5 (5.6%); procedure time: 190 (interquartile range 138-294) and 171 (interquartile range 133-290) seconds; time to complete hemostasis: 61 (interquartile range 31-108) and 51 (interquartile range 30-81) seconds; intraoperative blood loss (Δhemoglobin): 0.4 (interquartile range 0.2-1.0) and 0.5 (interquartile range 0.1-0.9); complication rate: 6 (6.5%) and 2 (2.2%). In a multivariate analysis, study group allocation (P = .021) and parity (P = .028), but not age, body mass index, type of transformation zone, and dysplasia degree independently influenced the amount of resected cone mass.

CONCLUSION

Loop electrosurgical excision procedure with intraoperative colposcopy leads to significantly smaller cone specimens without compromising margin status.

A method to improve the accuracy between the presumed depth of excision and the actual depth of excision in women receiving LLETZ cervical treatment; a single-center, two-operator experience

BACKGROUND

We aimed to determine whether continuous auditing of the presumed depth of excision and comparing with the actual depth of excision in women having large loop excision of the transformation zone (LLETZ) improves the ability to acquire the desired depth of excision.

METHODS

This was a prospective study of women submitted to a single LLETZ treatment between 2017-2018. Two senior colposcopists recorded what they presumed was the depth of excision at the time of treatment and the subsequent histopathology report provided the actual excised depth. Multiple linear regression identified independently associated parameters with the difference between presumed and actual excision depth. Non-linear regression determined the learning plateau defined as the theoretical minimal score of difference one could achieve with infinite practice.

RESULTS

There were significant differences in practices with the first colposcopist using an 18-mm loop and the second colposcopist a 15-mm loop in the majority of cases. The median absolute and percentage difference between the presumed and actual excised depth was 2 mm and 16.6 % and 3.5 mm and 35.4 % for the two colposcopists, respectively. A learning plateau was identified only for the first colposcopist. We found that auditing consecutive excisions decreased significantly the difference between the presumed and actual depth of excision with a learning plateau at 2.2 mm of absolute difference and 22.6 % of percentage difference and with a learning rate of 13 cervical excisions.

CONCLUSION

There might be a benefit in auditing our treatment practice as there seems to be a learning plateau through this method. HIPPOKRATIA 2018, 22(3): 113-121.