Review Article
Hysteroscopic Metroplasty for the Septate Uterus: Review and Meta-Analysis

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Abstract

The introduction of hysteroscopy to diagnose and treat intrauterine conditions, specifically to divide the uterine septum, or metroplasty, has replaced the traditional laparotomy approach, and objective results demonstrate its salutary effects in women treated. Hysteroscopic metroplasty averts the implications of major invasive abdominal surgery, with good and satisfactory results in pregnancy and live-birth rates, despite the lack of prospective, randomized, controlled studies. A careful review of the published results supports this type of treatment when the uterine septum adversely affects normal reproductive function.

Section snippets

Incidence

It is difficult to determine the incidence of congenital uterine malformations in the general population because most affected women do not experience reproductive problems. The incidence has been calculated to be 1 or 2 per 1000 women and as high as 15 per 1000 women. Some studies have reported a 12% incidence 1, 2, 3, 4, 5.

Genetic Factors

The occurrence of congenital uterine malformations seems to be influenced by a genetic heterogeneity and/or polygenic multifactorial inheritance. Inasmuch as these

Classification of Uterine Anomalies

There are many classifications of developmental anomalies of the uterus. In 1979, Buttram and Gibbons [11] proposed a classification that was further revised in 1988 by the American Society of Reproductive Medicine, then known as the American Fertility Society [12] (Fig. 2). This classification groups anomalies in categories on the basis of similarities in clinical features, obstetric outcome, and treatment options [12]. While the American Society of Reproductive Medicine classification has

Vascularization and Muscular Components of the Uterine Septum

Few histologic evaluations of the uterine septum have been performed. It is clear that the composition of the septum varies according to site and level at which the tissue samples are obtained for study. In addition, the width of the septum is important inasmuch as some are very thin and others very thick; thus, the results obtained from studies vary considerably. The uterine septum, in general, is composed of fibromuscular tissue and may borrow vascularization from the adjacent uterine walls.

Diagnosis and Evaluation

Although the diagnosis of a malformed uterus can be made during physical examination when obvious anomalies of the vagina and cervix are present, the subtlest uterine anomalies can be discovered and confirmed only by other methods of evaluation such as hysterosalpingography, sonography in all its modes, and hysteroscopy (Figs. 3 and 4). Differentiation of a bicornuate from a septate uterus may require additional evaluation via ultrasonography and/or laparoscopy. Imaging techniques are discussed

Reproductive Problems Caused by Uterine Septum

Most women with müllerian anomalies, specifically of the septum, have efficient reproductive function; only about 20% to 25% may experience recurrent spontaneous abortions 22, 23. Of all of the uterine anomalies encountered, septate uterus is most often associated with reproductive wastage. The classic clinical finding is of repeated early mid-trimester pregnancy wastage with obvious signs of labor, including bleeding. Infertility rarely results from a uterine anomaly alone. Therefore, the mere

Why Do Some Women With Uterine Septum Abort?

Several theories have been offered to explain why repetitive abortions occur in women with uterine septum. These include decreased luminal space, impaired development of the endometrium such that it cannot support the pregnancy, decreased steroid estrogens receptors, decreased serum cystine aminopeptidase, and decreasing neutralization of circulating oxytocin [26]. Other theories include an alteration in cervical fibromuscular/connective tissue ratios. The hypermuscular cervix, with increased

Indications for Metroplasty

Most women with septate uterus reproduce successfully; only 20% to 25% may have pregnancy wastage, late first-trimester abortion, or early second-trimester abortion initiated with mini-labor and bleeding. This problem seems to correlate with the length of the septum, with longer septae posing the greatest risk. The most genuine indication for treatment is repeated abortion. However, with the advances in minimally invasive procedures such as hysteroscopy, other relative indications include

Preoperative Evaluation and Diagnosis

Multiple imaging methods have been used to delineate uterine anomalies. Because most women with uterine anomalies have normal external genitalia, most uterine anomalies are not apparent until the time of expected menarche or at work-up because of infertility or pregnancy loss.

Treatment of Uterine Septum

Because the original metroplastic procedures via laparotomy paved the way to the modern approach via hysteroscopy, a brief review of those methods is in order.

Prophylactic Antibiotic Therapy

Although various antibiotic regimens are used perioperatively with hysteroscopic metroplasty, no prospective randomized studies have been performed to demonstrate their efficacy.

Hormone Therapy

Because hysteroscopic metroplasty is ideally performed in the early follicular phase of the menstrual cycle, when the endometrium is thin, occasionally hormone therapy may be required, and among the various options, gonadotropin-releasing hormone analogues are well suited for this task 96, 97. Postoperative hormone

Healing of the Uterus After Hysteroscopic Metroplasty

The high regenerative capacity of the normal endometrium helps in the healing process of the defect from septal division. Fedele et al [132] demonstrated the centripetal and centrifugal directions of the endometrial repair that occurs after division of the uterine septum. At 13 days after the procedure, they studied, via light microscopy and scanning electron microscopy, the histologic changes of the defect left after resection of the septum. Re-epithelialization of the defect proceeded

Treatment of Complete Septate Uterus With Septate Cervix

Treatment of complete septate uterus with septate cervix may be somewhat more challenging than treatment of the corporeal septum alone 109, 113, 134, 135, 136, 137. With the background of the embryologic origin of the uterus and arrest of reabsorption of the medial septum, the complete septum is thinner in the lower segment, close to the internal cervical os, where the original reabsorption begins. Therefore, by inserting a probe or indwelling catheter through one of the cervical openings and

Endoscopic Treatment of Bicornuate Uterus or Strassman Metroplasty

Bicornuate uterus is a defect that results from lack of fusion of the müllerian ducts and can be the cause of pregnancy wastage. The original treatment proposed by Strassman was laparotomy and hysterotomy. A transverse uterine fundal incision between the round ligaments is made to divide the uterine fundus until the uterine cavity is entered; then the incision is closed anteroposteriorly. Attempts have been made to perform this operation less invasively by using endoscopes. The methods used are

Early and Late Complications of Hysteroscopic Metroplasty

As with any surgical procedure, hysteroscopic metroplasty may have its complications. These include bleeding, fluid overload, uterine perforation, formation of adhesions, and uterine rupture in subsequent pregnancy.

Published Surgical Results of Hysteroscopic Metroplasty and Their Level of Evidence

Many reports in the literature have detailed the salutary effects of treatment of septate uterus on subsequent reproduction173, 174. However, all have uniformly used the patients as their own control, without prospective randomization or sufficient number of patients for comparison of treatment vs no treatment. Nonetheless, the accumulated experience and favorable results indicate the beneficial effect of surgery. Thus, perhaps a prospective randomized study comparing treatment vs no treatment

Meta-analysis of Reproductive Outcomes After Hysteroscopic Metroplasty

We identified studies that reported outcomes after hysteroscopic metroplasty from 1986 to 2011 by performing an extensive search of Medline and by hand searching cross-references and review articles. Keywords used in the search included “hysteroscopy,” “metroplasty,” “uterine septum,” “recurrent miscarriage,” “infertility,” and “uterine anomalies.” No randomized controlled trials were identified; thus, all included studies in the meta-analysis were categorized as Canadian Task Force

Future of Hysteroscopic Metroplasty

Innovations in instrumentation and safe energy sources will continue to improve the safety and simplicity of hysteroscopic metroplasty. The hysteroscopic scissors should be made sturdier without compromising diameter and semi-rigidity. They also should maintain their ability to cut after several uses. On the horizon is the introduction of endoscopes that are also capable of sonographic evaluation with sufficient resolution and penetration to aid in the safe, precise, and efficient division of

Summary and Conclusions

Septate uterus resulting from failure of reabsorption of the embryologic original fusion of the müllerian ducts may impair reproductive function in 20% to 25% of women with this anomaly. When this occurs, the septum may be amenable to surgical correction now performed via hysteroscopic or resectoscopic division. The limitations and inconveniences of laparotomy and hysterotomy are thus averted, and preservation of the integrity of the uterine walls does not require cesarean section in subsequent

Acknowledgments

We thank Drs. Alfred W. Rademaker (Professor, Department of Preventive Medicine) and Amy Wong (Fellow, Maternal-Fetal Medicine, Department of Obstetrics and Gynecology) at Northwestern University for assistance with the statistical analysis.

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