Likelihood of Accomplishing an In-Patient Hysteroscopic Myomectomy in a One-Step Procedure: A Systematic Review and Meta-Analysis

Indraccolo, Ugo; Bini, Vittorio; Favilli, Alessandro

doi:https://doi.org/10.1155/2020/4208497

BioMed Research International

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Abstract Introduction Methods Results Discussion Conclusions Conflicts of Interest Acknowledgments References Copyright Related Articles

Review Article | Open Access

Volume 2020 | Article ID 4208497 | https://doi.org/10.1155/2020/4208497

Likelihood of Accomplishing an In-Patient Hysteroscopic Myomectomy in a One-Step Procedure: A Systematic Review and Meta-Analysis

Ugo Indraccolo,¹Vittorio Bini,²and Alessandro Favilli¹

Academic Editor: Adeola Olaitan

Received10 Sept 2019

Accepted20 Nov 2019

Published08 Jan 2020

Abstract

Purpose. To assess the feasibility rate of one-step hysteroscopic myomectomy according to the technique adopted. Methods. In July 2016, PubMed, ClinicalTrials.gov, SCOPUS, Scielo, and AJOL databases were used for searching references. Series of in-patient hysteroscopic myomectomies reporting success rate in only one-step procedure, categorization of submucous fibroids, explanation of the surgical technique, and description of patients were considered eligible for meta-analysis (retrospective, prospective randomized studies). Two authors extracted the data. Rate of myomectomies accomplished in only a surgical step and rate of intraoperative complications were extracted per protocol. A modified GRADE score was used for quality assessment. Random-effect models were already assumed. Mean rates were compared among subgroups. Results. One thousand two hundred and fifty-seven studies were screened and 241 of these were read for eligibility. Seventy-eight series were included in qualitative synthesis and 24 series were included in quantitative synthesis. Wide heterogeneity was found. In series with <50% of G2 myomas treated, the slicing technique feasibility rate was 86.5% while techniques for enucleating the deep portion of the myomas showed a feasibility rate of 92.3% (). In series with ≥50% of G2 myomas treated, the slicing technique feasibility rate was 70.6% while techniques for enucleating the deep portion of myomas showed a feasibility rate of 88.4% (). Complications were significantly lower for alternative techniques to the classical slicing. Conclusion. In case of submucous myomas with intramural development, the slicing technique was correlated with a lower rate of in-patient hysteroscopic myomectomies accomplished in a one-step procedure and a higher complications rate.

1. Introduction

Uterine myomas, also called leiomyomas or fibroids, are benign, monoclonal tumours developing from the smooth muscle cells of the myometrium. Myomas represent the most common pathology of the female genital tract causing abnormal uterine bleeding, pelvic pain, and infertility [1–3]. Although it has been estimated that the majority of uterine fibroids is asymptomatic, submucous myomas account for 5–10% of all fibroids and are correlated with the most severe symptomatology [4, 5].

The advent of endoscopic surgery has revolutionized the treatment of submucous myomas, offering a valid alternative to hysterotomy or hysterectomy. Nowadays, the resectoscopic myomectomy is considered the gold standard in the treatment of submucous myomas [6]. Neuwirth in 1976 described the first “excision of submucous fibroids with hysteroscopic control,” performed by classical slicing technique. Although this new surgical approach was a breakthrough in the treatment of submucous myomas, the authors recommended resectoscopic myomectomy be performed only by expert endoscopic surgeons [7, 8]. Indeed, the main limit in performing hysteroscopic myomectomy has always been represented by the intramural component of submucous myomas, as it is responsible for unsatisfactory surgical outcomes, intraoperative complications, and need for repeated procedures [9, 10]. The difficulty to manage submucous myomas with a deep myometrial development was well described and demonstrated by Wamsteker in 1993, conceiving a new classification—still used today—based on the amount of intramural component of submucous myomas. The authors suggested limiting the treatment of deeper submucous myomas only in selected cases because it correlated with high risk of repeated procedures [9].

Over the last decades, there has been a rapid evolution in the hysteroscopic approach for the treatment of submucous myomas, driven by the technological progress that has offered a wide range of performing instruments to the surgeons. At the same time, several techniques for in-patient hysteroscopic myomectomy have been proposed aimed at ensuring the safe and effective removal of submucous myomas. Among them, in order to minimize the need of repeated procedures, the authors conceived techniques to accomplish the treatment in only one surgical time [11], as multiple treatments can cause physical and mental stress for both surgeons and patients, along with a higher surgical risk [12]. To date, a comprehensive analysis on the success rate of in-patient hysteroscopic myomectomy in a single treatment, according to the technique applied, is lacking in scientific literature.

The aim of this systematic review and meta-analysis was to assess the feasibility of the one-step in-patient hysteroscopic myomectomy according to the technique adopted. Moreover, as a secondary outcome, the rate of intraoperative complications recorded in the selected clinical series, when reported, was also meta-analysed to assess the safety of each technique.

2. Methods

2.1. Protocol

The review was reported following the PRISMA guidelines for reporting systematic reviews and meta-analyses [13] and registered in the PROSPERO database (registration number: CRD42017067543).

Prospective or retrospective clinical series, cohorts and case control studies, and randomized controlled trials were considered eligible for the review. Medical papers reporting feasibility of the one-step procedure, the technique by which the in-patient hysteroscopic myomectomies were performed, as well as the characteristics of patients and myomas treated were considered for the meta-analysis. If available, additional information such as myoma size, number/rate of cases with multiple myomas in the series, administration of gonadotropin releasing hormone analogue (GnRHa), or other presurgical therapies and intraoperative complications were also recorded. In the absence of information, the corresponding authors, if available, were contacted to provide them.

2.2. Literature Search and Review

A scientific literature search was performed in July 2016 and was conducted in main databases including PubMed, ClinicalTrials.gov (http://www.clinicaltrials.gov), SCOPUS, Scielo, and AJOL (African Journals Online) search engines, using combinations of the following keywords: “operative hysteroscopy” AND “myomectomy,” “operative hysteroscopy” AND “complications,” “hysteroscopic myomectomy,” “hysteroscopic complication” AND “myomectomy.” No language limits were set. In order to better categorise and analyse the one-step feasibility rate according to the kind of myomas treated, only medical papers reporting submucous myomas categorized according to the Wamsteker Classification (G0, completely intracavitary, pedunculated myoma, with no intramural extension; G1, submucous myoma with <50% intramural extension; and G2, submucous myoma with at least 50% intramural extension) [9] were considered as eligible. Therefore, clinical series published before 1993 were excluded from the review.

Medical papers were assessed in a multistep procedure as follows. Titles and abstracts were evaluated, and duplicates were discarded. Case reports, reviews, overviews, letters, guidelines, meta-analyses, and surveys with questionnaires were not considered eligible for meta-analysis. Studies about in-office hysteroscopic myomectomy were also excluded due to the different settings which could bias the comparison with in-patient procedures. Additional articles incidentally found during the full-text research and references discovered by reading the selected medical papers were also introduced in the meta-analysis database. English, French, Spanish, Portuguese, and Italian full-text articles were read in original languages. Other medical papers were translated in English or Italian.

2.3. Data Extraction

Feasibility rate of one-step in-patient hysteroscopic myomectomy was the main effect size assessed and was defined as the rate of cases in which in-patient hysteroscopic myomectomy was accomplished in only one surgical procedure, entirely removing submucous myomas treated. As a secondary effect size, the rate of complications found during the hysteroscopic procedure or immediately after the surgery was calculated. Long-term complications were not considered.

Rates were calculated per protocol and the rate of the event was assessed as a binomial casual variable. Two authors (I. U. and F. A.) performed data extraction at the same time by reading the texts altogether. Any disagreement between them over the eligibility of specific studies was resolved through discussion with a third author (B. V.). In case of complications or feasibility rates of 0% or 100%, the rate of rare events was calculated applying the rule of Quigley et al. (i.e., 2/5n in case 0 events occur in order to estimate rare events, where n is the number of observations in the sample) [14].

Missing information was asked to corresponding authors by e-mail or phone call.

2.4. Quality Assessment

The quality assessment of the series was evaluated based on the feasibility reported in accomplishing the in-patient hysteroscopic myomectomy in only one-step procedure. Two authors (F. A. and I. U.) provided the quality assessment altogether, and disagreements were resolved by discussion with a third author (B. V.). A quality score system in accordance with the GRADE approach [15] was used for assessing the quality of each series included in meta-analysis. Considering that studied effect size was expressed as a rate, the GRADE score was modified assuming additional sources of bias.

Clinical series were scored as follows:(i)4 for randomized controlled trial(ii)3 for prospective studies(iii)2 for retrospective studies(iv)1 for small series

Complications in operative hysteroscopy are rare [16–18] but when trying to avoid them, they can influence the one-step procedure feasibility [19]. Some small series could not report complications, while other small series could report complications, leading to underestimation or overestimation of the complications rate. Therefore, during the selection of the clinical series, it was considered that the minimal limit of cases for including a small series was the one with at least a complication. Nevertheless, if other small series with the same number of patients enrolled were found but with no complications reported, they also were included in meta-analysis. This choice was given to balance the overestimation or underestimation of complications rates in small series. Small series were considered if characterised by a total of 14 cases or less.

The quality assessment downgraded the small series even when they were a part of other kind of studies (i.e., arms of randomized controlled trials or observational studies).

Additional sources of biases were considered, and the score was downgraded or upgraded as follows:(i)Surgical technique description was not clearly available (−1: poorly explained, +1 clearly explained).(ii)Feasibility was not clearly reported (−1: poorly reported, +1 clearly reported).(iii)The characteristics of patients were not clearly described (−1: poorly described, +1 clearly described).(iv)Need of estimating missing data (−1: yes; +1: no) in the feasibility if the reported rate of success in one-step myomectomy was 100% or 0% (need to estimate rare events) or missing mean myoma size as mean diameter.(v)Sample of ≤100 cases (−1: yes; +1: no).

To get the overall quality score, this bias score was added to the one given according to the type of study as previously described. A score of more than 4 was considered to assess good quality series.

2.5. Statistical Analysis

Data were extracted from selected studies and combined applying a random-effect model [20], which incorporates heterogeneity of effects. Heterogeneity of studies was evaluated by the Cochrane Q test and reported as I² statistics, which describe the percentage of total variation across studies which is due to heterogeneity rather than chance [21]. Heterogeneity was considered significant if and I² was more than 50%. Begg and Egger’s tests [22, 23] were used to test for publication bias. In a sensitivity analysis, the influence of individual studies on pooled estimates was assessed using Tobias’ method [24]. If the point estimate with one study omitted lay outside the confidence interval (CI) of the overall estimate of all trials, the study was indicated as having excessive influence.

2.6. Subgroup Analyses

On the basis of the main aim of this meta-analysis and on what already reported by Wamsteker et al. about difficulties of treating the intramural component of submucous myomas [9], the series were arranged in subgroups taking into consideration the technique for removing the myomas and the proportion of the G2 myomas reported in the series (more or equal to 50% or less than 50%).

The z-statistic (one-tiled) was applied to compare the subgroups effect sizes (mean feasibility and mean rate of complications) in subgroups. A was set as significant.

The calculations were made by using StatsDirect Software, version 2.7.2 (Cheshire, UK, 2008).

3. Results

The steps of study selection are reported in Figure 1 (PRISMA flow diagram). During the literature review, 2472 references were found. There were 1215 duplicate references, which were removed by using the EndNote tool. After removing duplicates, 1257 references were screened by reading the titles and abstracts, looking for clinical series of in-patient operative hysteroscopies. Additional duplicate references were removed manually. Five hundred and ninety-four studies were reassessed focusing on operative hysteroscopies, excluding out-patient procedures. Two hundred and seventy-nine studies were reassessed looking for hysteroscopic myomectomies even in subgroups. In this step, the surveys based on questionnaires were also excluded. Twelve studies were removed from the database because they were published before 1993. Full texts of 222 studies were searched. Looking for full-texts, 19 more studies were found and were added to the database. The studies in the database were carefully checked for eligibility. Ten studies were discarded because after the full-text reading, it was understood that they were not clinical series on hysteroscopic myomectomy, while 18 other studies were discarded because the full texts were not available. Of the 213 studies, 11 were discarded because 10 of them reported duplicate cases and 1 study reported a series with duplicate cases in one arm and insufficient information in the other arm. One hundred and thirty-nine studies were discarded because they did not meet the inclusion criteria. Sixty-three references were eligible for the review [10, 12, 17, 25–50, 51–84] (Table 1). Thirteen studies reported two or more arms. Each arm was able to be meta-analysed for feasibility. Therefore, 78 effect sizes were assessed. Instead, 73 series were adequate to be assessed for complications rate [10, 12, 17, 25–29, 31–39, 41–76, 79–84].

The 78 series came from 20 different countries: 26 from Italy (33.3%), followed by France (9 series, 11.5%), United States, China, Spain (5 series, 6.4%), Egypt (4 series, 5.1%), United Kingdom, Turkey, Japan (3 series, 3.8%), Tunisia, Poland, Greece, the Netherlands (2 series, 2.6%), Australia, Belgium, Brazil, Germany, Taiwan, Finland, and India (1 series, 1.3%).

Series of poor quality (≤4 in quality score) were 54 (69.2%). The characteristics of the selected study and the quality score given for each series are reported in Table 1.

With regard to the techniques applied, classical slicing was the most commonly used technique for removing submucous myomas (45 series, 57.7%). In 6 series (7.7%), morcellators (Truclear®, MyoSure®, and Bigatti shaver®) were used. In one series (1.3%), the YAG laser was used (Table 1). In the series of Smets et al. [77], morcellators, YAG laser, and classical slicing were all used.

The hysteroscopic myomectomy techniques conceived for treating the intramural component of fibroid in only one surgical step are summarized in Table 2.

Figure 2 shows in details the subgroup arrangement for qualitative and quantitative analysis. The good quality series (>4 quality score) were 25. In total, 3037 and 2888 patients were considered to study feasibility and complications rates, respectively. Of the 25 series of good quality, 10 used the slicing technique (7 with <50% of G2 myomas rate, while 3 with ≥50% of G2 myomas rate). One series reported the use of Myosure® [46]. Techniques for enucleating the deep portion of myomas were reported in 14 series (8 with <50% of G2 myomas rate, while 6 with ≥50% of G2 myomas rate). The “Cold loop” technique [17] was reported in 7 series (4 with <50% of G2 myomas rate and 3 with ≥50% of G2 myomas rate) (Table 1). Complications were not assessed in 2 [40, 78] of 25 series. Table 3 reports the quality score results in assessing bias risk, of the 24 series of good quality available for meta-analysis. The Myosure® arm series in Hamidouche et al. [46] is not reported in Table 3 because it was the only good quality series of the morcellators group. Therefore, it was not possible to meta-analyse data on the morcellators group.

Quantitative subgroup findings were reported in Table 4. The forest plots for the feasibility proportions are shown in Figures 3 to 8. Figures 3 and 4 report forest plots for the slicing technique. Figures 5 and 6 report forest plots for the techniques used for removing the deep portion of myomas. Figures 7 and 8 report forest plots for the “Cold loop” technique. The figures report data syntheses of series with less than 50% rates of G2 myomas and at least 50% rate of G2 myomas.

The Myosure® arm series in Hamidouche et al. study [46] (the only good quality series among morcellators group) reports 0.647 (95% CI 0.476–0.787) of feasibility, while complications cases were 5 to 34 patients (0.147; 95% CI 0.063–0.308). All complications reported in the study of Hamidouche at al [46] were instances of bleeding.

Table 5 reports descriptive statistics of complications rates found in good quality studies.

The comparison among groups of good quality series resulted in the following:(i)Slicing technique versus techniques for enucleating deep portion of myomas in clinical series with less than 50% of G2 myomas. Feasibility: z = 5.454, . Complication rate: z = 6.277, .(ii)Slicing technique versus “Cold loop” technique in clinical series with less than 50% of G2 myomas. Feasibility: z = 6.303, . Complication rate: z = 4.044, .(iii)Slicing technique versus techniques for enucleating deep portion of myomas in clinical series with more or equal to 50% of G2 myomas. Feasibility: z = 5.000, . Complication rate: z = 1.846, .(iv)Slicing technique versus “Cold loop” technique in clinical series with more or equal to 50% of G2 myomas. Feasibility: z = 3.608, . Complication rate: z = 3.712, .

4. Discussion

The main objective of the present systematic review and meta-analysis was to assess the feasibility rate of the one-step in-patient hysteroscopic myomectomy according to the technique adopted. Therefore, the results obtained from this meta-analysis should be considered with a descriptive value. To our knowledge, this is the first meta-analysis on this subject.

The high heterogeneity observed in accomplishing in-patient hysteroscopic myomectomies in only one-step procedures, even after sub-groups analysis, was the main finding that emerged from the review of current literature. Therefore, it is difficult to provide the true rate of feasibility and complications according to techniques applied, based on the available literature. Indeed, a significant number of poor quality series—due to bias on collecting or reporting data—were found in the scientific literature available. Although myoma grading is reported in clinical series published after the advent of Wamsteker classification [9], the number of submucous myomas was missing at times and in the same way, the location of myomas was often not reported. The mean myoma size was also often not described in detail. Some authors reported the main diameter of myomas as mean or median with interquartile ranges, suggesting asymmetric distribution of myoma size. Additionally, in some cases, the authors provided the myomas’ size as mean diameter using ultrasound investigation (trans-vaginal or trans-abdominal scans); in other ones, they used radiological imaging techniques or subjective assessment during hysteroscopy. Moreover, all these methods might be imprecise in assessing myomas’ size, due to the irregular shape of fibroids. It should be underlined that with an increasing diameter, the volume of myoma grows to the third power. This issue greatly affects the complete removal of myoma in one-step surgical procedures [85].

Doubtless, the intramural extension of submucous fibroids influences the chance of achieving the complete resection of myomas in one surgical session [11]. As acknowledged by the authors [86, 87], the possibility to perform an in-patient hysteroscopic myomectomy with a low complications rate is also linked to several parameters related to the myomas (volume, number, grading, and location). Even in good quality series, all those factors related to the myoma characteristics may play a role in influencing the rate of incomplete removal of myomas, justifying the heterogeneity found.

The wide variability highlighted seems also to reflect the personal ability of surgeons to deal with submucous myomas, according to their skills and surgical background, as several techniques for removing deep submucous myomas have been reported (Table 2).

An additional source of variability may be the use of drugs before the hysteroscopic myomectomy or other concomitant surgeries in the same procedure. It is currently unclear if other surgeries or therapies could affect the one-step hysteroscopic myomectomy [42].

The use of alternative techniques for removing the intramural portion of the myomas seems to improve feasibility compared to the slicing technique, with less or equal rate of intraoperative complications. Nevertheless, none of the techniques for treating the deep portion of myomas have been tested against the slicing technique or against other techniques in randomized controlled trials. Therefore, it is not possible to label a single technique as the best one. Among techniques for treating the intramural portion of the myomas, only the “Cold loop” technique has been reported by different authors, demonstrating a certain degree of reproducibility.

The use of morcellators seems to be limited to series with a low rate of or with no G2 myomas. In the present systematic review, only one good quality series describing morcellators was available for meta-analysis, it was therefore not possible to carry out data synthesis.

Finally, caution in interpreting the rate of complications should be used. It was decided to provide results of complications as a secondary outcome because the effectiveness of a surgical technique cannot be assessed without taking into consideration intraoperative complications. As the quality assessment was only done on the feasibility rate, bias on the reports of complications could be found even in good quality studies. However, it has already been acknowledged that the complications of operative hysteroscopy are overall low [16–18], in agreement with the findings of the present study.

Based on the findings of this meta-analysis, it can be stated that it is hard to compare the feasibility and the complications rates of the resectoscopic myomectomy according to the technique adopted among available clinical series. The studies often do not report pivotal information to allow comparability. Future clinical series on in-patient hysteroscopic myomectomy should provide a detailed description of the myomas treated and of the characteristics of patients treated, along with information on additional hysteroscopic procedures needed to accomplish the treatment and any presurgical therapy administered.

5. Conclusions

In conclusion, it can be stated that there is still no single hysteroscopic technique proven to be unequivocally superior to the others for treating submucous fibroids with intramural development in one-surgical step. Nevertheless, despite the heterogeneity found among the clinical series analysed, it seems that all the techniques used to deal with the intramural portion of myomas work better than the slicing technique, achieving a higher rate of procedures accomplished in a single surgical time and a lower number of complications. Randomized controlled trials for testing which is the best technique for the one-step in-patient hysteroscopic myomectomy are needed. In absence of such evidence, it should be assumed that classical slicing is not the best surgical technique for treating the intramural portion of the myomas.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

Acknowledgments

The authors thank the following authors for sharing information which improved the results of the meta-analysis: Rovira Pampalona J., Departamento de Ginecologia y Obstetricia, Hospital de Igualada, Consorci Sanitari de l’Anoia, Igualada, Barcelona, Spain; Arcaini L. Operative Unit of Obstetrics and Gynaecology, San Paolo Hospital, Milano, Italy; Bori S., Complex Operative Unit of Obstetrics and Gynaecology, San Giovanni Battista Hospital, Foligno, Italy; Daraï E., Chef de Service de Gynécologie Obstétrique et Médicine de la Reproduction, Hôpital Tenon. Paris, France; Lasmar R.B., Department of Gynaecology and Obstetrics, Federal Fluminense University, Rio de Janeiro, Brazil; Bigatti G., Complex Operative Unit of Obstetrics and Gynaecology, San Giuseppe Hospital of Milan, Italy; Bonino L., Unit of Minimally Invasive Gynaecology, University of Turin, Turin, Italy; and Murakami T., Department of Obstetrics and Gynaecology, Shiga University of Medical Science, Shiga, Japan. The authors also thank the Korean Society of Obstetrics and Gynaecology, the Editorial office of the Cezka Gynekologique, the Medical Association of Thailand, the IROG Canada, and the Società Italiana di Ginecologia e Ostetricia for providing full-text articles otherwise unavailable. Finally, the authors are grateful to Bitetti M., Complex Operative Unit of Paediatrics, “Alto Tevere” Hospital of Città di Castello (PG), ASL 1 Umbria, Italy, who translated papers from German for free.

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