Evaluation of Botulinum Toxin Injections for Women with Severe Primary Dysmenorrhea Unresponsive to First-Line Treatments
This trial is investigating an innovative treatment approach for women who experience extremely painful menstrual periods that have not improved with standard treatments. The study focuses on using botulinum toxin injections delivered directly into the muscle layer of the uterus through a procedure called hysteroscopy.
Main inclusion criteria: Women eligible for this study must be adults who have not reached menopause and suffer from severe menstrual pain, with an average pain score of 6 or higher out of 10 over the past three months. Importantly, participants must have already tried standard medical treatments without success, including hormonal therapy and pain medications such as NSAIDs. A recent pelvic MRI within the last six months must show no evidence of endometriosis, endometriosis cysts, or uterine fibroids. All participants must use highly effective birth control methods, including hormonal contraception, IUDs, condoms, or other methods with less than 1% failure rate, and have a negative pregnancy test before joining the study.
Main exclusion criteria: Women cannot participate if they have had previous uterine surgery, have unexplained abnormal uterine bleeding, have blockages in the uterus such as fibroids or polyps, or have adenomyosis. The study also excludes women who are pregnant, planning pregnancy, or breastfeeding. Those with allergies to botulinum toxin, neuromuscular diseases like myasthenia gravis, active pelvic infections, or those who have never had sexual intercourse cannot participate. Women who cannot understand or follow study instructions or who have participated in another clinical trial within the past three months are also excluded.
Focus and goal: This is a double-blind, randomized controlled trial, meaning neither participants nor researchers know who receives the actual treatment versus placebo injections. The main goal is to evaluate whether botulinum toxin injections can significantly reduce menstrual pain in women who haven't responded to first-line treatments. Participants will be followed for six months, with assessments at one, three, and six months after the procedure. The study measures changes in menstrual pain intensity, pain during sexual intercourse, sexual function, quality of life, and other related symptoms through various questionnaires. The primary assessment occurs at three months to determine meaningful symptom improvement.
Investigational drug: The trial uses botulinum toxin, which works by blocking nerve signals and muscle contractions. In this study, it's injected into the myometrium, the middle layer of the uterine wall, to potentially reduce the painful uterine contractions associated with menstruation. This represents a novel approach to managing severe menstrual pain by directly targeting the uterine muscle rather than using systemic medications.