Uterine artery embolization, surgery and high intensity focused ultrasound in the treatment of uterine fibroids: a network meta-analysis

Complications and adverse events of high-intensity focused ultrasound in its application to gynecological field - a systematic review and meta-analysis

OBJECTIVE

To analyze and summarize the types, incidence rates and relevant influencing factors of adverse events (AEs) after high-intensity focused ultrasound ablation of gynecological diseases and provide reference and basis for handling such events in clinical practice.

METHOD

We searched PubMed, Cochrane Library, Web of Science and Embase databases to retrieve all literature since its establishment until February 2024. We evaluated the quality of included literature and publication bias and conducted a meta-analysis of single group rates for various AEs using Stata 17.0.

RESULTS

This systematic review finally included 41 articles. We summarized 34 kinds of AEs in 7 aspects and conducted a single group rate meta-analysis and sub-group analysis of 16 kinds of AEs. Among the common AEs of High-Intensity Focused Ultrasound (HIFU), the incidence of lower abdominal pain/pelvic pain is 36.1% (95% CI: 24.3%∼48.8%), vaginal bleeding is 20.6% (95% CI: 13.9%∼28.0%), vaginal discharge is 14.0% (95% CI: 9.6%∼19.1%), myoma discharge is 24% (95% CI: 14.6%∼34.8%), buttock pain is 10.8% (95% CI: 6.0%∼16.5%) and sacral pain is 10% (95% CI: 8.8%∼11.2%). Serious complications include uterine rupture, necrotic tissue obstruction requiring surgical intervention, third degree skin burns and persistent lower limb pain or movement disorders.

CONCLUSION

The common AEs after HIFU surgery are mostly mild and controllable, and the incidence of serious complications is extremely low. By reasonable prevention and active intervention, these events can be further reduced, making it a safe and effective treatment method. It is a good choice for patients who crave noninvasive treatment or have other surgical contraindications.

Efficacy and safety of uterine artery embolization via the distal radial approach for uterine fibroids or adenomyosis: a single-center retrospective cohort study

Background

The standard approach for transarterial embolization of uterine fibroids or adenomas is via the femoral artery, but this approach limits the patient's quality of life and increases the risk of deep vein thrombosis in the lower extremities. We applied the distal radial approach technique for the treatment of uterine artery embolization, and aimed to explore the feasibility and safety of uterine artery chemoembolization through the distal radial approach.

Methods

We conducted a retrospective study at The First Hospital of Jilin University from January 1, 2021 to November 30, 2023. The main inclusion criteria were: (I) uterine fibroids and adenomyosis were confirmed by preoperative imaging examination; (II) able to accurately palpate the distal radial artery pulse, and the Allen test is negative. Exclusion criteria: patients with distal radial pulses that cannot be palpated, or who are palpable but have radial arteriotomy dialysis, have a tortuous angle on preoperative radial artery ultrasound, which is not conducive to guidewire catheter passage. The primary endpoint of this study was the success rate of distal radial artery puncture. The secondary endpoints included complications and the duration of the puncture.

Results

Sixteen patients were enrolled in this study, of which 8 (50%) had uterine fibroids, 5 (31.25%) had uterine adenomas, and 3 (18.75%) had both. The puncture success rate was 93.75% (15/16) and one patient who failed to puncture the distal radial artery was changed to the radial artery approach. The mean time of puncture was 21±8.54 minutes. There were no complications, including bleeding, hematoma, arterial dissection, pseudoaneurysm formation, or distal radial artery occlusion, observed.

Conclusions

Uterine artery embolization by the distal radial artery approach is safe and feasible, and should be widely promoted in uterine artery embolization.

Factors influencing magnetic resonance imaging changes associated with pelvic bone injury after high-intensity focused ultrasound ablation of uterine fibroids: a retrospective case-control study

Background

The application of high-intensity focused ultrasound (HIFU) in the treatment of uterine fibroids is becoming increasingly widespread, and postoperative collateral thermal damage to adjacent tissue has become a prominent subject of discussion. However, there is limited research related to bone injury. Therefore, the aim of this study was to investigate the potential factors influencing unintentional pelvic bone injury after HIFU ablation of uterine fibroids with magnetic resonance imaging (MRI).

Methods

A total of 635 patients with fibroids treated with HIFU in the First Affiliated Hospital of Chongqing Medical University were enrolled. All patients underwent contrast-enhanced MRI (CE-MRI) pre- and post-HIFU. Based on the post-treatment MRI, the patients were divided into two groups: pelvic bone injury group and non-injury group, while the specific site of pelvic bone injury of each patient was recorded. The univariate and multivariate analyses were used to assess the correlations between the factors of fibroid features and treatment parameters and pelvic bone injury, and to further analyze the factors influencing the site of injury.

Results

Signal changes in the pelvis were observed on CE-MRI in 51% (324/635) of patients after HIFU. Among them, 269 (42.4%) patients developed sacral injuries and 135 (21.3%) had pubic bone injuries. Multivariate analyses showed that patients with higher age [P=0.003; odds ratio (OR), 1.692; 95% confidence interval (CI): 1.191-2.404], large anterior side-to-skin distance of fibroid (P<0.001; OR, 2.297; 95% CI: 1.567-3.365), posterior wall fibroid (P=0.006; OR, 1.897; 95% CI: 1.204-2.989), hyperintensity on T2-weighted imaging (T2WI, P=0.003; OR, 2.125; 95% CI: 1.283-3.518), and large therapeutic dose (TD, P<0.001; OR, 3.007; 95% CI: 2.093-4.319) were at higher risk of postoperative pelvic bone injury. Further analysis of the factors influencing the site of the pelvic bone injury showed that some of the fibroid features and treatment parameters were associated with it. Moreover, some postoperative pain-related adverse events were associated with the pelvic bone injury.

Conclusions

Post-HIFU treatment, patients may experience pelvic injuries to the sacrum, pubis, or a combination of both, and some of them experienced adverse events. Some fibroid features and treatment parameters are associated with the injury. Taking its influencing factors into full consideration preoperatively, slowing down treatment, and prolonging intraoperative cooling phase can help optimize treatment decisions for HIFU.

Therapeutic Outcome of MR-Guided High-Intensity Focused Ultrasound (MR-HIFU) in Solitary versus Multiple Uterine Fibroids

MR-guided high-intensity focused ultrasound (MR-HIFU) is an effective method for treating symptomatic uterine fibroids, especially solitary lesions. The aim of our study was to compare the clinical and morphological outcomes of patients who underwent MR-HIFU due to solitary fibroid (SF) or multiple fibroids (MFs) in a prospective clinical trial. We prospectively included 21 consecutive patients with SF (10) and MF (11) eligible for MR-guided HIFU. The morphological data were assessed using mint Lesion™ for MRI. The clinical data were determined using the Uterine Fibroid Symptom and Quality of Life (UFS-QOL) questionnaire before and 6 months after treatment. Unpaired and paired Wilcoxon-test and t-tests were applied, and Pearson’s coefficient was used for correlation analysis. A p-value of 0.05 was considered statistically significant. The volume of treated fibroids significantly decreased in both the SF (mean baseline: 118.6 cm³; mean 6-month follow-up: 64.6 cm³) and MF (107.2 cm³; 55.1 cm³) groups. The UFS-QOL showed clinical symptoms significantly improved for patients in both the SF and MF groups regarding concern, activities, energy/mood, and control. The short-term outcome for the treatment of symptomatic fibroids in myomatous uterus by MR-guided HIFU is clinically similar to that of solitary fibroids.

A review of high-intensity focused ultrasound as a novel and non-invasive interventional radiology technique

High-intensity focused ultrasound (HIFU) is a non-invasive interventional radiology technology, which has been generally accepted in clinical practice for the treatment of benign and malignant tumors. HIFU can cause targeted tissue coagulative necrosis and protein denaturation by thermal or non-thermal effects, guided by diagnostic ultrasound or magnetic resonance imaging, without destruction of the normal adjacent tissue, under sedation or general anesthesia. HIFU has become an important alternative to standard treatments of solid tumors, including surgery, radiation, and medications. The aim of this review is to describe the development, principle, devices, and clinical applications of HIFU.

Retrospective Analysis of the Effect of Lidocaine Combined with Methylprednisolone on Pain Control After Uterine Artery Embolization

Background

The analgesic effect produced by the intra-arterial injection of lidocaine in patients undergoing uterine artery embolization has been proven to be safe and effective. Nevertheless, a significant degree of pain is typically experienced after the operation, and pain management is crucial. Methylprednisolone, which provides an anti-inflammatory effect, is widely used in the treatment of several diseases. To date, methylprednisolone has not been used after uterine artery embolization.

Methods

A total of 131 patients with uterine leiomyoma were retrospectively enrolled. Forty-five patients (control group) were treated with embolized microspheres for bilateral uterine artery embolization. Fifty (study group) and 36 (lidocaine group) patients were administered lidocaine mixed with embolized microspheres during embolization, and in addition, the study group was administered methylprednisolone. Completed pain scales at different time points during surgery were obtained from patients undergoing uterine artery embolization. Efficacy against pain was evaluated by comparing the pain score, inflammatory index, and use of sufentanil within 24 h followed by a Kruskal-Wallis Test and a least significant difference post-hoc analysis.

Results

The postoperative pain scores at 1, 4, and 7 h after uterine artery embolization in the study group (3.08 ± 2.09, 2.46 ± 1.93, and 2.38 ± 1.85, respectively) were significantly lower than those in the control group (4.84 ± 2.36, 4.16 ± 1.87, and 3.56 ± 1.93, respectively) and the lidocaine group (3.50 ± 2.10, 3.30 ± 1.88, and 3.28 ± 1.89, respectively). At the first 24 h after embolization, the total usage of sufentanil in the study group (31.4 ± 4.16) was significantly lower than those in the control group (45.7 ± 6.51) and the lidocaine group (38.3 ± 6.25). At 1 and 4 h, the pain scores of the lidocaine group were significantly lower than those of the control group. In addition, at the first 24 h after embolization, the total usage of sufentanil in the lidocaine group was significantly lower than that in the control group.

Conclusion

Lidocaine in combination with methylprednisolone can significantly alleviate pain and reduce the usage of sufentanil after bilateral uterine artery embolization. Thus, methylprednisolone is a recommended addition to the therapeutic regimen after embolization.