The risk of uterine rupture after myomectomy: a systematic review of the literature and meta-analysis
© Springer-Verlag Berlin Heidelberg 2014
Received: 7 January 2014
Accepted: 3 April 2014
Published: 10 May 2014
Fibroids may give rise to specific obstetrical complications such as pain due to degeneration, fetal malpresentation, or placenta previa. For all these reasons, surgical resection of the fibroid may be indicated before a pregnancy is pursued. The occurrence of a uterine rupture is a rare but severe complication of myomectomy. This study seeks to review the risk of uterine rupture during pregnancy and/or labor after laparoscopic myomectomy in comparison with laparotomic myomectomy. A systematic search of the literature through search strategies in MEDLINE (PubMed) and Embase (Embase.com) from January 1970 up to March 2013 was performed. We used the following MeSH terms and free text words: gynecologic surgical procedures, gynecologic surgery, leiomyoma, fibromyoma, fibroids, myoma, uterine tumors, and pregnancy complication. Our data show that the risk of uterine rupture during labor and delivery is low (0.75 %). Compared with traditional open myomectomy, the risk of uterine rupture during pregnancy is not significantly higher after a laparoscopic approach (P = 0.119). More elective cesarean sections are performed after laparoscopic myomectomy compared with the conventional open technique (P = 0.001). Our conclusions are supported by statistical pooling of observational studies of generally low methodological quality. The risk of uterine rupture after myomectomy is low (0.75 %). The available evidence in the literature does no allow discouraging attempts for childbirth per viam naturalem after previous myomectomy, regardless of the technique used. Randomized studies are needed before definitive evidence-based recommendations can be given.
During pregnancy, fibroids may cause pain due to degeneration, fetal malpresentation, or placenta previa. Therefore, surgical resection of the fibroid may be necessary before allowing women with fibroids to conceive. A laparotomic or laparoscopic approach will, in most cases, cause a scar in the myometrium, which may lead to weakening of the muscular wall and, by consequence, may increase the risk for the obstetric calamity of the sudden uterine rupture . Nevertheless, it is at the present unclear whether an elective cesarean section may prevent all cases of uterine rupture during labor after previous scarring of the uterus .
For unselected pregnant women, the prevalence of uterine rupture is significantly lower in community-based studies (median 0.05, range 0.02–0.30 %) versus hospital-based studies (median 0.31, range 0.01–2.90 %) . Since most women suffering from severe pain after a previous myomectomy will be admitted in the emergency department of a hospital, the hospital-based studies are likely to reflect the true incidence of the problem under study. In women with a history of cesarean section, the prevalence rate is about 1 % . The frequency of uterine rupture is generally lower in developed countries versus undeveloped countries, as defined by the United Nations. The World Health Organization (WHO) recommends doing further clinical research to estimate the incidence of uterine rupture and to distinguish clearly between ruptures with or without previous surgery on the uterus.
This study aimed to measure the likelihood of uterine rupture after myomectomy. We want to investigate if there are differences in the risk for this serious adverse event during pregnancy versus during the active labor stage. Moreover, we aimed to study if there are significant differences in the incidence of uterine rupture in women treated by laparoscopy versus classic open surgery.
Materials and methods
A systematic research of MEDLINE (PubMed) and Embase (Embase.com) for publications from January 1970 to March 2013 on the occurrence of uterine rupture after surgical myomectomy during pregnancy or labor was performed by using a combination of MeSH terms and free text words: gynecologic surgical procedures, gynecologic surgery, leiomyoma, fibromyoma, fibroids, myoma, uterine tumors, and pregnancy complication (Appendix 1). The results of the search are described in the attached PRISMA flowchart and checklist (Appendixes 2 and 3).
After removal of duplicates, 227 potentially useful publications were retained. The selection of potential studies to be included was done by reviewing the titles and abstracts by two authors (J.C. and J.B.) simultaneously and independently. Non-English articles were only used if an English abstract was available. If there was doubt, arbitration by the third review author (SW) was sought until consensus was reached. Finally, we included 56 articles for this meta-analysis [1, 4–58]. There was no selection based on the study methodology so that various types of articles were included, such as randomized controlled trials, case studies, case series, systematic and narrative reviews, comments, and letters to the editor.
The data extraction was performed by means of a standardized data extraction form (Appendix 4).
The data collected included the method of myomectomy, technique of suturing, location and size of the removed fibroids, time to pregnancy, setting of the study, and, for the published ruptures, the outcome of mother and child. In the absence of important information related to the type of surgery and the outcome of the mother or child, the authors were contacted in order to obtain this information.
If a single article stated that “no major obstetric complications happened,” we assumed that no rupture had occurred. A statistical analysis was carried out on the data using Fisher’s exact test in the statistical program SPSS.
In the 56 included articles, a total number of 3,685 pregnancies after myomectomy were described, the majority of which (2,017) following laparoscopic myomectomy, while 705 pregnancies occurred after laparotomic myomectomy and 484 pregnancies after other methods of myomectomy (hysteroscopic resection, myolysis, etc.). In 479 pregnancies, we failed to obtain any data on the method of myomectomy; these were excluded from further analysis.
The number of planned vaginal deliveries and primary cesarean sections in the laparoscopic group was 401 and 544, respectively, as compared to 124 and 101 cases, respectively, in the open surgery group. The likelihood of a primary cesarean section was significantly increased following a laparoscopic versus a classic open myomectomy (P = 0.001).
Of the 401 women who attempted vaginal birth after laparoscopy, a large majority (373 women or 93 %) eventually experienced a successful vaginal delivery, while only 28 (7 %) women were delivered by secondary cesarean section. In the group of 124 women attempting vaginal delivery after myomectomy by an open approach, 109 (88 %) delivered vaginally compared to 15 (12 %) who needed to be delivered by secondary cesarean section. There were no significant differences for the risk of secondary cesarean section between women treated by laparoscopic versus classic open myomectomy (P = 0.090).
Just over 50 % of the removed fibroids leading to a rupture of the uterine wall in a subsequent pregnancy were localized in the intramural part of the womb (13/24 or 54 %). The median size of the fibroid was 5 cm. We found no clear correlation between the risk for a uterine rupture and location of the fibroid and suturing technique or whether the operation was done in a university or a non-university hospital.
When information on maternal and fetal outcome after rupture was unknown, we tried to contact the author. By doing this, we were able to obtain additional information in 75 % of the contacted cases (three out of four). No difference was found in outcome of mother and child in relation to the setting (university versus non-university hospital). There were eight (33 %) neonatal deaths following a uterine rupture (five in the laparoscopic and three in the open surgery group). Our search failed to retrieve any report on maternal deaths following uterine rupture. This finding illustrates the high risk of publication bias associated with adverse events in the medical literature.
A uterine rupture is very exceptional in developed countries and more frequent in developing countries due to prolonged labor caused by fetomaternal disproportion or second-stage disorders . In developed countries, uterine rupture is almost exclusively observed following a previous cesarean section or previous surgery on the uterus, including myomectomy .
Our present systematic review identified pregnancies following myomectomy reported in the medical literature of the past four decades. We aimed to measure the incidence of uterine rupture after myomectomy in women wishing to conceive.
The prevalence of uterine rupture following myomectomy—all types of surgery—(0.79 %) is comparable with that after cesarean section. Based on the available evidence, there is no significant difference between the incidences of a rupture during pregnancy following a laparoscopic (1.2 %) versus an open myomectomy (0.4 %).
We observed a higher primary cesarean section rate after laparoscopic than after open myomectomy (P = 0.001). This observation may be partially explained by confounding: between 1970 and 2013, there has been an overall increase in the cesarean section rates leading to a higher primary C-section rate in the last two decades (the “era of laparoscopy”) compared to the era of open surgery. Indeed, in the last two decades, the laparoscopic approach has become the preferred technique, with laparoscopic suturing requiring more than average technical expertise. The higher primary cesarean section rate in this group may similarly reflect the surgeon’s anxiety that a laparoscopic myomectomy beholds a higher risk of rupture during subsequent pregnancy and labor compared to the open technique.
Furthermore, it is striking to observe that a uterine rupture in a woman following a myomectomy almost exclusively occurs during pregnancy and very exceptionally during active labor, as opposed to following a prior cesarean section. This can be explained to differences in the site of the incision with the majority of myomectomies being done in the corporeal part of the womb as opposed to the lower uterine segment in the case of cesarean delivery.
There is no significant increase in the risk for secondary cesarean section after laparoscopic compared with open myomectomy (P = 0.090). Attempts at vaginal birth seem equally highly successful following a laparoscopic or an open myomectomy (about 90 %). Moreover, none of the cases of secondary cesarean section was reportedly done for an impending uterine rupture. This finding should be interpreted with great caution, given that in the majority of published reports, no fully described reason for the secondary cesarean section was mentioned.
Furthermore, the occurrence of uterine rupture during labor was analyzed. There was one case of rupture during labor. Unfortunately, there were no data available whether this happened after laparotomic or open myomectomy. An attempt to obtain information from the primary study authors was not successful. It is important to note that this rupture during labor occurred under high-dose oxytocin administration, which, according to the author, could also have caused a rupture in an intact uterus .
It is clear that the location and size of the fibroids might affect the likelihood of uterine rupture following previous myomectomy. The limited number of events is too small to present definitive evidence on this subject. The same goes for the study of the relationship between the used suturing technique and the risk of uterine rupture. Also in the C-section literature, there is conflicting evidence about a possible increased risk of uterine rupture after closure of the wound in one layer, while a large multicenter case-control study demonstrated that a single-layer closure, as compared to a two-layer closure, might be associated with an increased risk of rupture [odds ratio (OR) 2.69, 95 % confidence interval (CI) 1.37–5.28]; a recent meta-analysis by Roberge et al. showed that only a locked single-layer closure leads to more ruptures (OR 4.96, 95 % CI 2.58, 9.52) [60, 61]. Additional studies in the future may provide more information.
Finally, most ruptures seem to occur in the mid-third trimester of pregnancy. Further research is needed to determine whether an adapted policy is needed in the third trimester of pregnancy in women who have undergone myomectomy.
The strength of this systematic review is that it is the first systematic literature review that was done to measure the incidence of uterine rupture following myomectomy based on the methodology of doing a systematic review of observational studies. Based on our findings, the risk of a uterine rupture following a myomectomy regardless of the technique used seems very rare (less than 1 % of the ongoing pregnancies). This estimation of the incidence might be used for counseling women wishing to conceive after a myomectomy, but it should be stressed that given the nature of our present research (systematic review (SR) and meta-analysis of observational studies) this should be done with utmost caution. It is clear that randomized studies are needed to study the effectiveness of laparoscopic myomectomy for the adverse outcome of uterine rupture before conclusive evidence can be used to present evidence-based recommendations for daily clinical practice.
Our research has several important limitations. First of all, we restricted our search to publications with an English abstract, which implies a high risk for selection bias. Secondly, the classically described systematic underreporting of iatrogenic complications is inevitably a potential source of publication bias. The observation that only 29 cases of uterine rupture during pregnancy after myomectomy were published and there were no maternal deaths is almost certainly a major underestimation of the true unknown incidence of this potentially life-threatening event. Thirdly, the risk of rupture after laparoscopic myomectomy during labor is possibly underestimated since obstetricians seem to be more apt to do a primary cesarean section for fear of medical litigation after laparoscopic myomectomy. This leads to a high risk of performance bias. In addition, many studies lacked detailed information on complications during pregnancy or labor. When “no major obstetric complications” were noted, it was assumed that no uterine rupture had occurred. This assumption might be a cause of reporting bias. Finally, the present research is based on observational studies only; this inevitably causes a high risk of bias. By consequence, our present calculation of the incidence of uterine rupture following myomectomy, although very clinically relevant and usable for counseling in daily practice, is, at the best, an estimation. The evidence presented in the present SR should therefore be graded as very low. The research question posed in this research is highly relevant for clinical practice. Randomized studies on this topic are eagerly awaited by the obstetrical community. These should not be considered as unethical, given the equipoise for the society, the pregnant women, and their treating physicians. It is clear that a large pragmatic multicenter randomized study could answer this present uncertainty.
We would like to thank Jens De Groot, university librarian of the University of Leuven, for helping with the search strategy in this study and Prof. Georges Van Maele, professor in biostatistics of the University of Ghent, for his contribution to the statistical analysis.
No external funding was sought for this study.
Conflict of interest
J.C., I.H., T.H., J.B., and S.W. declare that they have no conflict of interest.
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