Courtesy Gynesonics
The SMART Guide delineates the ablation zone (red ellipsoid) and thermal safety border (green ellipsoid). Everything within the ablation zone will be thermally ablated and undergo coagulative necrosis. The Thermal Safety Border denotes the maximum ...
A second visual safety check is completed, and the delivery of RF energy is initiated using a footswitch control. The time of energy delivery is determined based on the size of the desired ablation, up to 7 minutes for the largest ablation size (5 cm x 4 cm). The targeting and treatment steps are repeated as required to treat additional fibroids. Once the treatment is completed, the needle electrodes and introducer are retracted, and the treatment device removed.
Study results and the future
The 12-month safety and effectiveness data for ultrasound-guided transcervical ablation of uterine fibroids were reported in January 2019 in Obstetrics & Gynecology.4 Women enrolled in the prospective, multicenter, single-arm, interventional trial had 1-10 fibroids – the International Federation of Gynecology and Obstetrics (FIGO) types 1, 2, 3, 4, and 2-5 (pedunculated fibroids excluded) – with diameters of 1-5 centimeters. Patients also were required to have at least one fibroid indenting or impinging on the endometrial cavity (FIGO type 1, 2, 3, or 2-5).
Upon study entry, the pictorial assessment blood loss was required to be 150-500 cc. The study included 147 patients. Both coprimary endpoints were satisfied at 12 months; that is, 65% of patients experienced a 50% or greater reduction in menstrual bleeding, and 99% were free from surgical intervention at 1 year.
The mean pictorial blood loss decreased by 39%, 48%, and 51% at 3, 6, and 12 months respectively. Moreover, 95% of the study population experienced some reduction in menstrual bleeding at 12 months. There also were mean improvements in symptom severity and health-related quality-of-life parameters. Mean maximal fibroid volume reduction per patient was 62%.
More than half of the patients returned to normal activity within 1 day, 96% of patients reported symptom improvement at 12 months, and 97% expressed satisfaction with the procedure and results at 12 months. There were no device-related adverse events.
Dr. Charles E. Miller
I am the lead author for the 2-year follow-up study utilizing transcervical RFA of symptomatic uterine fibroids, which currently is in press. Suffice it to say, the quality-of-life data, symptom improvement, and lower rate of surgical reintervention all are significant and compelling. Ultimately, I believe Sonata will not only be a treatment of choice in the appropriate patient presenting with heavy menstrual flow or bulk symptoms secondary to uterine fibroids, but will prove to be beneficial in women with impinging or deep submucosal fibroids and implantation failure.
Dr. Miller is a clinical associate professor at the University of Illinois in Chicago and past president of the AAGL. He is a reproductive endocrinologist and minimally invasive gynecologic surgeon in metropolitan Chicago and the director of minimally invasive gynecologic surgery at Advocate Lutheran General Hospital, Park Ridge, Ill. Dr. Miller disclosed that he is a consultant for Gynesonics and holds a stock option agreement with the company.
References
1. Am J Obstet Gynecol. 2013 Oct;209(4):319.e1-319.e20.
2. Int J Hyperthermia. 2019;36(1):295-301.