Consideration for an optimal and practical approach to hysteroscopic adhesiolysis of intrauterine adhesions.

Intrauterine adhesions (IUA) as it relates to menstrual irregularities, infertility, and pelvic pain was first described by Fritsch in 1894, and then again by Asherman in 1950 (1,2). Its prevalence has been determined to vary anywhere between 0.3–21.5% (3). Pregnancy-related dilatation and curettage (D&C), a procedure that has been estimated to have occurred between 16–32% of women, is typically thought to be the most common cause of intrauterine adhesions, however approximately 31.3–45.5% of women can also develop intrauterine adhesions after hysteroscopic myomectomy (4). More primitive interventions were initially described to address these adhesions such as cervical probing and blind dilation and curettage, but with the advent of hysteroscopy came development of more refined techniques for adhesiolysis under direct endoscopic visualization. Two important considerations in performing successful adhesiolysis surgery are: (I) restoring normal uterine cavity and contour with promotion of normal endometrial growth, and (II) decreasing the risk of recurrence of intrauterine adhesions, which can occur in 50% of severe cases and 21.6% of moderate cases of IUA (5,6). How exactly to improve the fertile environment through hysteroscopic surgery is still challenging for most gynecologists. With advancements in technology, there are now a multitude of available hysteroscopic instruments and methods for use, but there is however no consensus on the “best” approach to intrauterine adhesions for optimal patient outcomes.

Zhao et al. (7) recently performed a retrospective study comparing outcomes, safety and efficacy of different approaches to hysteroscopic adhesiolysis of intrauterine adhesions. These authors are also the first to officially describe a “ploughing technique” with cold scissors that eliminates the use of electrocautery during adhesiolysis, which although has the advantage of the ability to obtain hemostasis during resection can also ironically increase the risk for the formation of post-procedure intrauterine adhesions through potential endometrial thermal damage (8-10). Additionally, addressed in this article is the need for resection of additional scar tissue during adhesiolysis, which is thought to be critical for successful restorement of the growth of normal endometrial tissue as scar tissue can prevent adequate blood supply from reaching the endometrium (7,8). Therefore, this study is important and practical as it is the first to compare immediate and long term outcomes of different techniques of hysteroscopic adhesiolysis.

One hundred seventy-nine patients who met enrollment criteria in this retrospective study were analyzed according to subsets in how their hysteroscopic adhesiolysis was performed: ploughing group (PG), in which cold scissors were used to resect adhesions and scar tissue, traditional group (TG), in which cold scissors were used to resect adhesions and scar tissue left alone, and electrosurgical group (EG), in which an energy L-hook electrode and resectoscope was used to resect adhesions and scar tissue left alone. Although the study states that the same surgeon graded each patient’s intrauterine adhesions in terms of severity based on the American Fertility Society (AFS) classification system, it is unclear how the method of resection of these patient’s adhesions were then subsequently decided on. Though the authors were able to demonstrate no statistically significant differences between the groups, perhaps a confirmation bias still existed during the scoring of these patient’s adhesions which may lend itself more amenable to a particular type of resection (11). Also interesting is the exclusion criteria of patients in whom both tubal ostia were not exposed postoperatively—is this immediately postoperatively, due to a potential ineffectiveness of method?—and additionally in patients in whom intrauterine adhesions had recurred—are these in patients operated on by the same facility or surgeon, when recurrence rates of intrauterine adhesions are found to be between 30–66% (12)?

The authors then demonstrated statistically significant outcomes between the three groups. In summary, postoperative AFS scores decreased in all groups—8.48±1.73 to 2.53±1.07 in PG, 8.74±1.19 to 3.17±1.45 in TG and 8.21±1.64 to 3.32±1.29 in EG—however, however postoperative AFS scores of PG was even more decreased compared to TG and EG (P<0.05). The authors were able to follow members of each group for 2 years and also demonstrated further significant outcomes in these patients: higher pregnancy rate, higher live birth rate, and lower miscarriage rate of PG when compared to TG and EG. During this 2 year follow up period, the spontaneous pregnancy rate of PG was 71.6%, which was significantly higher than that of TG (47.7%) and EG (41.1%). These numbers not only demonstrate clinical significance but also correlate with findings from other studies (13,14). This data certainly lends itself to the author’s conclusions that the “ploughing technique” is safe, feasible, and leads to desirable patient outcomes. It would also have been more informative for readers to include other pregnancy outcomes associated with hysteroscopic adhesiolysis such as placental abnormalities including placenta accreta spectrum, premature delivery, and uterine rupture (3,15).

Studies have been lacking comparing different methods of hysteroscopic adhesiolysis that Zhao et al. begin to address. As demonstrated by their study, PG had statistically and clinically desirable outcomes in regards to fertility. An additional consideration is the instruments used in PG required a smaller caliber operative hysteroscope (6.5 vs. 9.5 mm in EG) that may be better tolerated by patients in office. Their study begins to open the door for further comparison studies of techniques of hysteroscopic adhesiolysis and, although difficult to design, may lead to development of a randomized controlled trial.

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