Anatomical changes after hysteroscopic transcervical uterine septum resection—is there a place for hysterography?
© Springer-Verlag Berlin / Heidelberg 2004
Published: 24 December 2004
The anatomical changes of the uterine cavity after transcervical septum resection are reported. We measured the distance between the apices of the uterine horns and the extent of the uterine septum before and after the hysteroscopic resection of the septum. We calculated the index of the uterine cavity as a distance in millimeters between the uterine horns divided by the length of the uterine septum multiplied by 100. The retrospective study was performed in 43 women with transcervical uterine septum resection treated between 1999–2002 by the Institute for the Care of Mother and Child of Prague and the Institute for Postgraduate Medical Education of Prague. Hysteroscopic resection of the uterine septum with evaluation of the surgical effect by hysterography was indicated pre- and postoperatively. For many years, hysteroscopic transcervical uterine septum resection has been a method of choice in the treatment of congenital uterine malformations. We operated on 43 women and achieved 27 intrauterine pregnancies (62.8%), including 4 spontaneous abortions (14.8%). The aim of our study was to evaluate the changes of the uterine cavity after resectoscopic surgery and find out if there is any correlation between residual septum and pregnancy outcome. The uterine cavity index was measured and calculated from hysterograms. Diagnostic hysterography was performed before and 2–3 months after surgery. The results showed significant changes of the calculated ratio before and after surgery. When the above-mentioned ratio is 10% or less, reproductive failure is not expected. There is a higher incidence of spontaneous abortion when the ratio is more than 10%. Therefore, especially in difficult cases of uterine septum resection (e.g., hypoplastic septate uterus, repeat pregnancy loss or failure after surgery), postoperative evaluation of the uterine cavity is feasible.
The exact prevalence of septate uterus in the general population is still undetermined, but an estimate of 1% may be considered near the true figure . The prevalence in women with repeated pregnancy loss is significantly higher (3–4%). The reproductive outcome in women with septate uterus is characterized by an increased incidence of spontaneous abortion, premature birth and abnormal fetal presentations [8, 9, 10, 15]. Physiological pregnancy and term delivery are the optimal clinical outcomes after hysteroscopic transcervical resection of uterine septum. Different methods are used for evaluation of the uterine cavity. TVS, sonohysterography, 3-D ultrasound or diagnostic hysteroscopy is the methods of choice [1, 4, 7, 10, 11]. Less attention is paid to the postoperative evaluation of the uterine cavity.
Materials and methods
In an analytical, non-randomized study, we tried to ascertain the anatomical changes of the uterine cavity before and after hysteroscopic uterine septum resection in group I. Hysterography was performed before and 2–3 month after surgery in the early follicular phase of the menstruation cycle. For hysterographic examination, we used Telebrix N (Byk Gulden, Germany ). Radiograms were taken in the A-P directions. With the radiograms from hysterography, a ratio was derived in millimeters between the height of the fundic impression (septum) indenting the uterine cavity and the distance between the apices of the uterine horns. The ratio was calculated in percent. There is evidence in the literature to show that when the ratio is 10% or less, reproductive failure is not expected (e.g., in the arcuate uterus, the ratio is less than 10%) [12, 14].
Hysteroscopic resection of the uterine septum was performed in the early follicular phase under general anesthesia. The 8-mm continuous-flow resectoscope (Storz, Tutlingen, Germany) with a monopolar knife-shaped coagulating electrode at a power setting of 80–120 W was used. We used Purisol (Fresenius-Kabi, Austria) for the uterine cavity distension. We did not use any endometrial suppression therapy before surgery. For laparoscopic evaluation, the standardized diagnostic procedure was used for the hysteroscopic procedure. According to the aim of our study, we evaluated the pregnancy outcome after surgery. Statistical analysis was performed using the Χ2-test.
In group I (n=28), the ratio of the uterine cavity height and distance of the uterine horns apices was measured and calculated before and after hysteroscopic septum resection. The principle of the ratio calculation is given in Figs. 1 and 2. In groups II and III, the preoperative diagnosis and postoperative assessment of septum resection were not calculated.
According to the aim of our study, we analysed group I, and this group was divided into subgroups according to the calculated ratio: I-A (ratio <10%, n =17); I-B (ratio >10%, n =11).
The pregnancy rate in group I was 82.1% (n=23) and in groups II and III, 26.7% (n=4) (significantly different, P <0.01). The pregnancy rate in group I-A was 88.2% (n=15) and in group I-B, 72.7% (n=8) (not significantly different, P >0.01).
Pre- and postoperative evaluation and pregnancy outcome
Pre- and postoperative hysterography
Hysteroscopy pre- and postoperatively only
Sonography pre- and postoperatively only
n =28 (65.1%)
n =10 (23.2%)
n =5 (11.6%)
23 pregnancies (82.1%)*
4 pregnancies (26.7%)
Hysteroscopic treatment of congenital uterine malformations is a method of choice in infertile women, achieving high postoperative pregnancy rates [8, 10, 16]. In our study, we observed 27 (62,8%) intrauterine pregnancies, and there were 4 (14.8%) spontaneous abortions among them. No ectopic pregnancy was observed. Interestingly, the difference in pregnancy rates between the studied group I and groups II and III was significantly different. We can only speculate that this statistically proven difference between these groups is connected with different pre- and postoperative methods of uterine cavity evaluation.
The aim of our study was to ascertain anatomical changes of the uterine cavity after hysteroscopic septum resection [5, 12, 14]. We used hysterography in our study, although we know that other imaging methods, such as ultrasonography, are available [5, 10]. The final results of hysteroscopic septum resection are closely related to the operator’s experience [8, 9, 15, 16]. The exact knowledge of uterine cavity changes before and after surgery gives interesting information even to a skilled surgeon. Fedele et al. published that a small residual septum (<1 cm) after hysteroscopic septum resection does not impair the reproductive outcome .In our study, we calculated an index where the septum as well as the uterine cavity changes after resection are evaluated. Our results showed a higher incidence of spontaneous abortions when the calculated ratio was >10%. Especially in difficult cases such as reoperation after failed Strassman metroplasty, hypoplastic uterus or complete septate uterus, the hysteroscopic resection could be connected with incomplete resection. The residual septum could be connected with persistent pregnancy loss.
In our retrospective study we tried to point out interesting anatomical changes of the uterine cavity after hysteroscopic septum resection and reproductive outcome according to ratio of the uterine cavity height and the distance of the uterine horns apices.
The pregnancy rate in the group with index <10% was 88.2% and in the group with residual septum (index >10%), 72.7% (not significantly different). There was a higher incidence of spontaneous abortions in the group with residual septum (37.5%) than in the group with no residual septum (6.7%) (different).
Incomplete correction leaving residual uterine septum may influence the uterine capacity negatively. The residual septum could cause a higher incidence of pathologic implantation with following spontaneous abortion. Different authors have found that the septal endometrium showed defective development with less connective tissue, altered pattern of vascularity and more muscle fibers inside the septum [2, 3, 6]. The mechanism by which the septate uterus causes pregnancy loss is not clearly understood . We can only speculate that a higher incidence of spontaneous abortions in group I-B in our study was connected with septal implantation with poor embryo growth. In our opinion, this is a very important fact and has to be discussed with the patient, especially in the above-mentioned difficult cases connected with higher risk of residual septum. Repeated surgical interventions in case of incomplete septum resection are sometimes necessary, but for the patient troublesome. We suppose that our results together with the calculated index will help to understand better the anatomical changes of the uterine cavity.
Reliable diagnosis of the uterine cavity malformations depends on accurate assessment of the uterine cavity. There are several methods available with promising results from three-dimensional ultrasound . In our study, we used hysterography for exact measurement of the uterine cavity changes and index calculation, although we know that this method has only a few indications in gynecology. We hope that the results discussed in our paper will lead to further studies using different imaging methods for precise anatomical evaluation of the uterine cavity.
When the above-mentioned ratio is 10% or less, reproductive failure is not expected. There is a higher incidence of spontaneous abortion when the calculated ratio is more than 10%. Therefore, especially in difficult cases of uterine septum resection (e.g., hypoplastic septate uterus, repeat pregnancy loss or failure after surgery), the evaluation of surgical outcome after hysteroscopic septum resection by radiography is still useful.
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