A randomized clinical trial: Prevention of recurrence of moderate and severe IUA with different durations of disposable intrauterine balloon placement
This randomized clinical trial demonstrates that placing a disposable intrauterine balloon stent for 4 weeks following hysteroscopic adhesiolysis is significantly more effective than 1-week placement or no stent in preventing adhesion recurrence and improving menstrual and reproductive outcomes for patients with moderate-to-severe intrauterine adhesions.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Inside the human uterus, a delicate lining called the endometrium grows and sheds each month, creating the environment necessary for a pregnancy to take root. Sometimes, injury or infection damages this lining so deeply that scar tissue forms, causing the walls of the uterus to stick together. This condition, known as intrauterine adhesions, can block the cavity entirely or partially, leading to absent periods, pain, and infertility. For decades, the standard treatment has been a surgical procedure using a thin, lighted camera to cut away these scars and restore the shape of the uterine cavity. However, the surgery itself presents a new problem: once the scar tissue is removed, the raw surfaces of the uterus often heal by sticking back together, causing the adhesions to return. To prevent this, doctors have tried placing small devices inside the uterus after surgery to act as a spacer, keeping the walls apart while the tissue heals. The big question has always been how long these spacers need to stay in place to be truly effective.
Researchers at the Obstetrics and Gynecology Hospital of Fudan University set out to answer this question by testing two different durations against a group that received no spacer at all. They enrolled 142 women who had moderate to severe scarring inside their uterine cavities. All participants underwent the same surgical procedure to remove the adhesions. Immediately after the surgery, the women were randomly assigned to one of three groups. The first group received a small, disposable balloon stent that remained inflated for just one week. The second group received the same type of balloon, but it stayed inside for four weeks. The third group served as a control and received no balloon at all. Following the surgery, every woman took medication to help the uterine lining regenerate, and all were monitored closely for complications, changes in their menstrual flow, and the thickness of their uterine lining.
The study found that the length of time the balloon stayed inside made a significant difference in how well the uterus healed. Women who kept the balloon in place for four weeks saw the best outcomes. Their menstrual flow returned to normal more often than in the other groups, and their uterine linings grew thicker, which is a sign of healthier tissue. When the doctors looked inside the uterus again a few months later, the women with the four-week balloons had the least amount of new scar tissue forming. In fact, the group with the four-week balloons had a much lower rate of adhesion recurrence compared to those with the one-week balloons or those with no balloon at all. The pregnancy rates reflected this success as well; women in the four-week group were significantly more likely to become pregnant during the follow-up period than those in the one-week group.
Safety was also a major focus of the research. The team wanted to ensure that leaving a foreign object inside the uterus for a month did not increase the risk of infection or cause other problems. They found that the rate of complications, such as fever or pain, was similar across all three groups. Even though the balloon remained in place longer for one group, there was no increase in serious infections or other adverse events. The researchers noted that the balloon used in the study was shaped like an inverted triangle, matching the natural shape of the uterus, which helped it stay in place without causing irritation. In just one case, a balloon slipped out on its own two weeks after surgery, but this did not affect the overall results or the ability to assess the healing process.
The findings suggest that for women with moderate to severe scarring, a longer period of separation is more beneficial than a short one. While a one-week balloon provided some benefit over having no balloon at all, extending the placement to four weeks offered a clear advantage in preventing the scars from reforming and in helping women conceive. The study did not find that keeping the balloon in for even longer would be better, nor did it claim that this method works for every type of uterine problem, but for the specific group of patients studied, the four-week duration proved to be the most effective strategy. By keeping the uterine walls apart for a full month, the body was given enough time to heal properly without the walls fusing back together, offering a clearer path to restoring fertility.
Drowning in papers in your field?
Get daily digests of the most novel papers matching your research keywords — with technical summaries, in your language.