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Background
Uterine fibroids (leiomyomata) represent the most common gynecological tumor in women of reproductive age and are responsible for over 200,000 hysterectomies per year. They can cause a variety of symptoms including menometrorrhagia, dysmenorrhea, pelvic pain, reproductive failure, and compression of adjacent pelvic viscera, or be totally asymptomatic. A large array of treatment options exist for this disorder. Surgical treatments include hysterectomy, abdominal myomectomy, laparoscopic myomectomy, myolysis, and more recently magnetic resonance imaging (MRI)-guided ultrasound ablation. Non-surgical treatments include medical therapy (e.g., gonadotropin-releasing hormone agonist) and uterine artery embolization (UAE).
For the last 20 years, therapeutic embolization has been successfully performed on various parts of the body. In more recent years, this technology has been applied to uterine fibroids in an effort to eliminate the nagging symptoms associated with uterine fibroids and offer women an alternative to hysterectomy and myomectomy. This outpatient procedure, which may require an over-night admission for pain control, uses angiographic techniques and fluoroscopic guidance to embolize the uterine arteries, similar to the methods used to control post-operative and post-partum hemorrhage. The embolization, consisting of tiny particles of polyvinyl alcohol (500 to 700 micron size), occludes the blood supply to the fibroids, which results in their ischemic infarction and subsequent degeneration over a period of weeks and months. Average fibroid volume reduction is approximately 50 % in 3 months and 65 % at 1 year. Uterine volume decreases by approximately 40 % in 3 months. The reduction in the fibroid's size leads to a decrease or resolution in the symptoms they cause. The procedure takes approximately 1 to 2 hours and it is anticipated that most women can return to work 7 days after the procedure.
The initial studies that have been published to date suggest that both menorrhagia and symptoms caused by the bulk of these fibroids will be significantly improved or will resolve in 80 to 90 % of patients on short-term follow-up. The patients in these series have tolerated the procedure well and patient satisfaction is high, but they all require careful post-procedural pain management. While severe ischemic injury to the uterus has been feared, the literature suggests that this occurs in only 1 to 2 % of patients. Unlike myomectomy, all fibroids can be treated simultaneously, regardless of their location or size in the uterus. Unlike Lupron, the literature indicates that premature menopause is rarely induced. It has been shown that if the procedure is not successful and surgery is needed, this surgery is rendered easier, with a likelihood of less bleeding.
However, long-term follow-up on a larger number of cases will be required before any definitive statement can be made about the ultimate role of embolization in the treatment of uterine fibroids as compared to the other available therapies. The long-term outcome is not known, in that recanalization of the arteries could occur or collateral vessels could be recruited which might allow re-growth of the fibroids. Post-procedure fertility and the ability to carry a pregnancy to term are not presently known since most patients in published series have not sought to become pregnant. The effect on ovarian function has been a question, given the sporadic reports of amenorrhea after treatment. It is not known whether ovarian infarction occasionally occurs to affect function or whether merely decreasing uterine flow is sufficient to affect ovarian function. Further, it is not clear whether ovarian function is affected in only a few patients or whether it is more common and just not apparent clinically.
Despite the unknowns, it is clear that the initial experience with UAE suggests that this procedure is effective and safe in the short term and represents a promising new therapy for this very common medical condition.
A report by the American College of Obstetricians and Gynecologists (2004) stated that "UAE for the treatment of symptomatic fibroids, when performed by experienced physicians, appears to provide good short-term relief among appropriate candidates." ACOG strongly recommends that women who wish to undergo UAE have a thorough evaluation with an obstetrician/gynecologist to help facilitate optimal collaboration with interventional radiologists and ensure that the procedure is appropriate. There is insufficient data at this time to ensure that UAE is safe for women who may wish to become pregnant in the future, the report notes. Moreover, few studies have assessed the effect of embolization on pregnancy-related outcomes. For these reasons, ACOG considers the procedure investigational or relatively contraindicated in such women. Also, the report warns that UAE is rarely, if ever, indicated in post-menopausal women.
Uterine artery embolization is contraindicated in women with any of the following conditions:
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Post-menopausal women with fibroid growth or rapid growth at any time (may indicate development of sarcoma); or
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Women who have evidence of current genito-urinary infection and/or malignancy; or
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Women who may wish to become pregnant in the future; or
- Women with a history of prior pelvic X-ray treatments, pelvic malignancy, chronic infections or severe endometriosis.
A report on the management of uterine fibroids prepared for the Agency for Healthcare Research and Quality (Viswanathan et al, 2007) stated that women who undergo UAE have shorter recoveries and spend less time in the hospital than women who have hysterectomies.
Currently, there is very little information regarding the effectiveness of MRI-guided ultrasound ablation for the treatment of uterine leiomyomata. In a review on the surgical and non-surgical management of uterine leiomyomata, Myers et al (2002) concluded that available evidence on the management of uterine leiomyomata is of poor quality. This is in agreement with the observation of Olive (2000) who stated that existing studies are generally small and of poor quality. There is a strong need for appropriately designed and analyzed randomized clinical trials, and surgical trials should preferably be multi-center/multi-surgeon.
Recent studies by Tempany et al (2003) as well as Stewart et al (2003) suggested that MRI-guided focused ultrasound surgery appeared to be safe and effective for the treatment of uterine leiomyomas. However, both studies were authored by the same group of investigators and addressed only the safety and feasibility of this approach in treating uterine fibroids. These studies had small number of patients -- 9 in the study by Tempany et al (2003), and 55 in the study by Stewart et al (2003). They only demonstrated the safety and feasibility of MRI-guided focused ultrasound ablation for the treatment of uterine fibroids; however, its clinical value has not been established.
The first FDA-approved MRI-guided focused ultrasound system for the treatment of women with symptomatic uterine fibroids is the ExAblate 2000 System (InSightec, Ltd.). The U.S. pivotal trial included 192 women who had symptomatic uterine fibroids and were randomized to a hysterectomy (n = 83) or the ExAblate procedure (n = 109). At 6 months, 70.6 % of the ExAblate patients experienced a greater than 10-point reduction in the Uterine Fibroid Symptoms and Quality of Life Questionnaire score. The mean reduction in fibroid volume at 6 months was 13.5 %, but non-enhancing volume remained within the treated fibroid at 6 months. The hysterectomy patients performed better at 6 months than the ExAblate patients on several quality-of-life measurements, including role physical, body pain, general health, vitality, and mental health. The hysterectomy patients had a much higher rate of having at least 1 significant complication than the ExAblate patients (46 % versus 12 %). The ExAblate patients missed less work than the hysterectomy patients (1.2 versus 19.2 working days) during the first 30 days post-surgery (FDA Summary of Safety and Effectiveness Results).
The FDA required InSightec to conduct a 3-year post-market study to better assess the long-term safety and effectiveness of the ExAblate 2000 System. The study includes additional numbers of African-American women, because, as a group, these women have a greater incidence of uterine fibroids but were under-represented in the original study.
Further studies are needed to elucidate the exact role of MRI-guided focused ultrasound ablation in the management of uterine fibroids, especially studies that examine the correlation of treatment effect with changes in symptoms as well as comparisons of this new technology with other treatment methods such as UAE.
In a multi-center, clinical study, Stewart et al (2006) evaluated outcomes at 6 and 12 months after magnetic resonance-guided focused ultrasound surgery (MRgFUS) for symptomatic uterine leiomyomas. Pre-menopausal women with symptomatic uterine leiomyomas and no plans for future pregnancy (n = 109 at 6 months and n = 82 at 12 months) received a single treatment session of MRgFUS for uterine fibroids. Main outcome measures were reduction in fibroid symptoms as measured by the symptom severity score (SSS) of the Uterine Fibroid Quality-of-Life Instrument (UFS-QOL), the only validated measure of leiomyoma symptomatology. A 10-point reduction in the SSS was selected as the targeted improvement. A total of 71 % of women undergoing MRgFUS reached the targeted symptom reduction at 6 months, and 51 % reached this at 12 months. The magnitude of improvement in SSS was greater than predicted, with subjects having a mean decrease of 39 % and 36 % at 6 and 12 months, respectively. This paralleled the improvement seen using the short form-36 instrument. A modest volume reduction similar in magnitude to the treated volume was seen. The incidence of adverse events was low. These researchers concluded that MRgFUS treatment results in short-term symptom reduction for women with symptomatic uterine leiomyomas with an excellent safety profile.
In a review on percutaneous UAE for the treatment of symptomatic fibroids, Lupattelli et al (2005) stated that although randomized trials are still underway, UAE appears a good option for those patients who whish to conserve their fertility or when surgery is contra-indicated. However, to assess the long-term effects of UAE longer follow-up is needed. This is in agreement with the observation of Bachmann (2006) who noted that treatment options for women with symptomatic uterine leiomyomas have been expanded to include radiological interventions with UAE and focused ultrasound surgery despite the lack of long-term efficacy data.
An assessment by the Canadian Coordinating Office of Health Technology Assessment on MRI-guided focused ultrasound for the treatment of uterine fibroids (Chen, 2005) concluded that "[l]ong-term studies of larger patient groups are needed to provide further reliable evidence on the safety of this procedure, as well as its clinical and cost-effectiveness".
An assessment by the BlueCross BlueShield Association Technology Evaluation Center (BCBSA, 2005) concluded that MRI-guided focused ultrasound for uterine fibroids did not meet the TEC criteria: "The evidence is insufficient to determine whether the use of MR-guided, focused ultrasound improves net health outcome or whether it is as beneficial as any established alternatives." The TEC assessment stated that limitations in quality of the existing evidence include significant loss to follow-up at longer follow-up intervals, lack of adequate well-controlled comparison studies, and lack of comparability between treatment groups in the available nonrandomized comparisons.
The TEC assessment considered both published evidence on MRI-guided focused ultrasound and unpublished evidence from the InSightec study that was submitted to the FDA to support a PMA. The TEC assessment noted that the few available comparisons suggest that MRI-guided focused ultrasound may not be as effective as available alternatives. The TEC assessment reported that patient satisfaction from the procedure is higher with hysterectomy, as is the degree of symptom relief. The TEC assessment found no direct comparisons of MRI-guided ultrasound to either UAE or myomectomy available in the literature, but that this did not preclude TEC to reach some general and preliminary comparisons. The TEC assessment noted that durability of MRI-guided ultrasound is a major concern; a substantially greater proportion of women undergo other (or repeat) procedures after MRI-guided ultrasound compared to either UAE or myomectomy. The TEC assessment also found that available data suggest that fibroid volume reduction with MRI-guided ultrasound is much lower than with comparison procedures. Uterine artery embolization appears to produce a more profound improvement in symptom severity scores than MRI-guided ultrasound. For fertility preservation, myomectomy is the treatment of choice (TEC, 2005). The TEC assessment stated that neither UAE nor MRI-guided ultrasound is recommended if the woman desires to preserve fertility. The TEC assessment concluded that further study of the procedure and its durability, especially in light of other available treatments, is needed.
The National Institute for Health and Clinical Excellence (NICE, 2007) released interventional procedures guidance that concluded that "[c]urrent evidence on the safety and efficacy of magnetic resonance image (MRI)-guided focused ultrasound for uterine fibroids does not appear adequate" and that "further research on the procedure and publication of long-term outcomes would be useful." NICE reviewed the evidence on the safety and efficacy of the procedure, which comes from three uncontrolled case series. Most of the papers excluded from the analysis were earlier reports on some of the same women. The NICE assessment noted that a majority of published data have been reported by one study group. The NICE advisors observed that the primary endpoint in these case series was change in symptom severity rather than fibroid shrinkage, and that there is limited reduction in fibroid volume following the procedure (NICE, 2007). The assessment stated that there is no evidence on the effects of this procedure on fertility.
A related NICE interventional procedure consultation document (NICE, 2006) stated that the maximum follow-up reported across all the studies was 19.5 months, and that most of the studies report on outcomes at 6 months. A significant proportion of women included in these studies were lost to follow-up. In addition, a significant proportion of women sought alternative treatments following the procedure, such as hysterectomy.
The NICE assessment listed skin burns as a potential complication from the procedure, occurring in 5 % of subjects in 1 case series (NICE, 2007). Another potential complication was reversible neural damage; 2 studies reported on cases of pain in the distribution of the sciatic nerve which resolved in both cases within 1 year of the procedure. The NICE advisors also commented that thermal damage to adjoining structures was a theoretical concern.
The Agency for Healthcare Research and Quality's report on management of uterine fibroids (Viswanathan et al, 2007) concluded that research is lacking for the long-term symptom relief of MRI-guided-ultrasound ablation.
An assessment of the evidence on treatment of uterine fibroids by BMJ Clinical Evidence concluded that the effectiveness of MRI-guided focused ultrasound is unknown (Lethaby and Vollenhoven, 2006).
Sharp (2006) stated that new technologies for the treatment of uterine leiomyomata include UAE, MRI-guided focused ultrasonography, laparoscopic uterine artery occlusion, and cryomyolysis. There is sound evidence for shorter hospital stay, quicker return to work, and a similar major complication rate compared with hysterectomy. Uterine artery embolization appears to be effective for up to 5 years in reducing bulk symptoms and menorrhagia associated with leiomyomata. The chance of re-operation for leiomyoma-related symptoms within 5 years is 20 to 29 %. Women who wish to become pregnant should be cautioned about potential complications during pregnancy. There is insufficient evidence to recommend UAE in post-menopausal women. With regard to MRI-guided focused ultrasonography, fibroid cryomyolysis (freezing), and laparoscopic uterine artery occlusion, Sharp (2006) commented that although the initial symptom reduction outcomes have been reported as favorable, more data are needed to better understand the durability of these results.
In a review of treatment of uterine fibroids, Van Voorhis (2009) stated that although early outcomes of up to 1 year are encouraging, long-term effectiveness and comparative studies are needed before focused ultrasound can be recommended for the treatment of uterine fibroids.
Hald et al (2007) compared clinical outcome 6 months after treatment with bilateral laparoscopic occlusion of the uterine artery versus uterine leiomyoma embolization. A total of 66 pre-menopausal women with symptomatic uterine leiomyomata were randomized to treatment with either laparoscopic occlusion of uterine arteries or uterine leiomyoma embolization. The primary outcome was reduction of blood loss from pre-treatment to 6 months post-operatively, measured by a Pictorial Bleeding Assessment Chart. Secondary outcomes included patients' own assessment of symptom reduction, post-operative pain assessed using visual analog scales, ketobemidone used post-operatively, complications, secondary interventions, and failures. Fifty-eight women were included; 6-month follow-up data were available for 28 participants in each group. The percentage reduction in Pictorial Bleeding Assessment Chart scores did not differ between the treatment groups (52 % after uterine leiomyoma embolization and 53 % after laparoscopy, p = 0.96). The study had 52 % power to detect a 20 % difference on the Pictorial Bleeding Assessment Chart. Fewer participants in the group treated with uterine leiomyoma embolization complained of heavy bleeding after 6 months (4 % compared with 21 %, p = 0.044). The post-operative use of ketobemidone was higher after uterine leiomyoma embolization (46 mg compared with 12 mg, p < 0.001). The authors concluded that both laparoscopic occlusion of uterine vessels and embolization of uterine leiomyoma improved clinical symptoms in the majority of patients. Participants with the laparoscopic procedure had less post-operative pain but heavier menstrual bleeding 6 months after treatment. They noted that a larger study and longer follow-up is necessary before a definite conclusion can be made regarding the most effective treatment.
In a pilot randomized clinical trial, Cunningham and colleagues (2008) compared peri-operative pain and institutional use for women undergoing transcatheter UAE and transcatheter uterine artery occlusion (UAO) for the treatment of heavy uterine bleeding associated with uterine leiomyomas. Pre-menopausal women with heavy uterine bleeding related to uterine leiomyomas were enrolled. Either a standard UAE with microspheres or UAO using vascular coils was used. The main outcome measures were analgesic use, institutional stay, and post-procedural numeric pain scales. A total of 16 women were enrolled and 14 underwent study procedures (UAE n = 8, UAO n = 6). Baseline Aberdeen Menorrhagia Severity Scale scores, also known as the Ruta scores, were similar in each group (UAE = 54, UAO = 53). Median pre-procedural uterine volume was similar for each group (UAE = 557 ml, UAO = 612 ml). The median post-procedural pain scale was less for UAO than UAE (UAO 1, UAE 5; p < 0.05). Six patients with UAE and no patients with UAO required parenteral narcotic analgesia in the recovery room (p < 0.05). Patients with UAE used 6 hospital nights and patients with UAO used 1 hospital night (p = 0.09). Three-month Aberdeen Menorrhagia Severity Scale scores were reduced to a similar degree in each group (UAE = 58 %, UAO = 63 %). The authors concluded that transcatheter UAO is a promising alternative transcatheter technique for the treatment of symptoms related to uterine leiomyomas, with less post-procedural pain, reduced requirements for analgesics, and shorter hospital stays than transcatheter UAE. They stated that although the results of the study are promising, larger-scale trials with longer follow-up are needed to both confirm these results and evaluate the long-term efficacy of transcatheter UAO.
In a review of treatment of fibroids by means of UAO, Brill (2009) discussed the putative mechanism of action and clinical application of Doppler-guided UAO; and noted that this approach is a new investigational treatment modality for uterine fibroids.
In a Cochrane review, Liu and colleagues (2009) evaluated the risks and benefits of herbal preparations for uterine fibroids. These investigators searched following electronic databases: the Trials Registers of the Cochrane Menstrual Disorders and Subfertility Group and the Cochrane Complementary Medicine Field, the Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library 2008, Issue 3), MEDLINE, EMBASE, the Chinese Biomedical Database, the Traditional Chinese Medical Literature Analysis and Retrieval System (TCMLARS), AMED, and LILACS. The searches ended on 31st December 2008. Randomized controlled trials comparing herbal preparations with no intervention, placebo, medical treatment or surgical procedures in women with uterine fibroids were selected. Trials of herbal preparations with or without conventional therapy were also included. Two review authors collected data independently. They assessed trial risk of bias according to their methodological criteria; and presented dichotomous data as risk ratios (RR) and continuous outcomes as mean difference (MD), both with 95 % confidence intervals (CI). These investigators included 2 randomized trials (n = 150) with clear description of randomization methods. The methodological risk of bias of the trials varied. There were variations in the tested herbal preparations, and the treatment duration was 6 months. The outcomes available were not the primary outcomes selected for this review, such as symptom relief or the need for surgical treatment; trials mainly reported outcomes in terms of shrinkage of the fibroids. Compared with mifepristone, Huoxue Sanjie decoction showed no significant difference in the disappearance of uterine fibroids, number of patients with shrinking of uterine fibroids or average volume of uterine fibroids, but less effective than mifepristone on reducing average size of uterus (MD 23.23 cm(3), 95 % CI: 17.85 to 28.61). There was no significant difference between Nona Roguy herbal product and gonadotropin-releasing hormone agonist in average volume of uterine fibroids or size of uterus. No serious adverse effects from herbal preparations was reported. The authors concluded that current evidence does not support or refute the use of herbal preparations for treatment of uterine fibroids due to insufficient studies of large sample and high quality. They stated that further high quality trials evaluating clinically relevant outcomes are needed.
In a Cochrane review, Zhang and associates (2010) evaluated the benefits and harms of acupuncture in women with uterine fibroids. The following electronic databases were searched May 21, 2009: the Cochrane Central Register of Controlled Trials (CENTRAL); MEDLINE; EMBASE; AMED; the Menstrual Disorders and Subfertility Group's Specialised Register of Trials; Chinese Biomedical Literature Database (CBM); Traditional Chinese Medical Literature Analysis and Retrieval System (TCMLARS); Chinese Medical Current Contents (CMCC) and China National Knowledge Infrastructure(CNKI). Citation lists, experts in the field and grey literature were also referred to. No restrictions such as language were applied. All RCTs comparing acupuncture management with placebo acupuncture, no management, Chinese medication, Western medication or other managements of uterine fibroids were considered for inclusion. Acupuncture management included either traditional acupuncture or contemporary acupuncture, regardless of the source of stimulation (e.g., body, electro, scalp, elongated, fire, hand, fine needle, moxibustion). Acupuncture management without needling was excluded. Two review authors assessed trial risk of bias according to our a priori criteria. No trials were included in this version of the review, therefore no data were collected. No randomized double-blind controlled trials met the inclusion criteria. The authors concluded that the effectiveness of acupuncture for the management of uterine fibroids remains uncertain. They stated that more evidence is needed to establish the safety and effectiveness of acupuncture for uterine fibroids. There is a continued need for well-designed RCTs with long-term follow-up.
Young et al (2012) stated that the transversus abdominis plane (TAP) block is a relatively new regional anesthesia technique that provides analgesia to the parietal peritoneum as well as the skin and muscles of the anterior abdominal wall. It has a high margin of safety and is technically simple to perform, especially under ultrasound guidance. A growing body of evidence supports the use of TAP blocks for a variety of abdominal procedures, yet, widespread adoption of this therapeutic adjunct has been slow. In part, this may be related to the limited sources for anesthesiologists to develop an appreciation for its sound anatomical basis and the versatility of its clinical application.
Abdallah et al (2012) noted that ultrasound guidance has led a surge of interest in TAP block for post-operative analgesia following abdominal surgery. Despite or because of the numerous descriptive applications and techniques that have recently populated the literature, results of comparative studies for TAP block have been inconsistent. This systematic review pragmatically addressed many unanswered questions, specifically the following: what are the effects of surgical procedure, block dose, block technique, and block timing on TAP block analgesia? A total of 18 intermediate- to good-quality randomized trials that included diverse surgical procedures were identified. Improved analgesia was noted in patients undergoing laparotomy for colorectal surgery, laparoscopic cholecystectomy, and open and laparoscopic appendectomy. There was a trend toward superior analgesic outcomes when 15 ml of local anesthetic or more was used per side compared with lesser volumes. All 5 trials investigating TAP block performed in the triangle of Petit and 7 of 12 trials performed along the mid-axillary line demonstrated some analgesic advantages. Eight of 9 trials using pre-incisional TAP block and 4 of 9 with post-incisional block revealed better analgesic outcomes. Although the majority of trials reviewed suggested superior early pain control, these researchers were unable to definitively identify the surgical procedures, dosing, techniques, and timing that provide optimal analgesia following TAP block. This review suggested that the understanding of the TAP block and its role in contemporary practice remains limited.
McDermott et al (2012) stated that any landmark-based regional anesthetic technique raises 2 important issues: (i) the accuracy of placement of the needle and thus the local anesthetic in a 'blind' technique, and (ii) the potential for damage to adjacent structures. These investigators designed a prospective, blinded study in an adult general surgical population to evaluate with ultrasound the placement of the needle tip and local anesthetic during TAP blocks using the landmark-based "double-pop" technique. After induction of general anesthesia, 36 adult patients had a TAP block performed bilaterally using the standard landmark-based technique. Ultrasonography was then used to record the actual needle position and local anesthetic spread. The anesthetist performing the block was blinded to the ultrasound images. A total of 36 adult patients were included in the study, which was terminated early due to what was considered an unacceptably high-level of peritoneal needle placements. The needle tip and local anesthetic spread were in the correct plane in only 17 (23.6 %) of the injections. In the remaining 55 (76.4 %), the needle was in the subcutaneous tissue 1 (1.38 %), external oblique muscle 1 (1.38 %), plane between the external and internal oblique muscles 5 (6.94 %), internal oblique muscle 26 (36.1 %), transversus abdominis muscle 9 (12.5 %), and peritoneum 13 (18 %). The authors concluded that the needle and local anesthetic placement using the standard landmark-based approach to the TAP block is inaccurate, and the incidence of peritoneal placement is unacceptably high.
Furthermore, there is a lack of evidence regarding the safety and effectiveness of the TAP block in the management of patients with uterine fibroids.
Law and associates (2000) reported that laser ablation of uterine fibroids using a percutaneous approach under local anesthetic in an open magnetic resonance scanner was performed in 12 symptomatic women awaiting hysterectomy. Accurate laser fiber placement was assisted by the use of a magnetic resonance needle tracking system, as well as laser heat dissipation monitored during treatment by a real-time imaging processor. This day case procedure was well-tolerated by all women, with 8 women subsequently declining their planned surgery. Follow-up measurements of treated fibroid volume by MRI demonstrated a mean decrease of 37.5 % at 3 months. The authors concluded that this novel minimally invasive approach offers an alternative to surgery for women with fibroids, but longer follow-up is needed to ascertain maximal fibroid shrinkage and to compare outcome with traditional surgery.
Cowan et al (2002) developed a trans-abdominal interventional MRI-guided cryoablation procedure for the treatment of uterine fibroid tumors and reported this novel approach. This study represented the preliminary and first report of a prospective Institutional Review Board-approved protocol to study interventional MRI-guided cryoablation of uterine fibroid tumors. Women were selected on the basis of symptoms that were related to uterine fibroid tumors (bleeding, uterine pain, pelvic congestion, compression symptoms) and the absence of any desire for child bearing. A physical examination confirmed the presence of fibroid tumors, and MRI was performed before the procedure to measure the size and number of fibroid tumors. Patients returned to the interventional MRI and underwent placement of 3 to 5 probes (2 to 3 mm) under MRI-directed guidance. Follow-up MRI determined the size reduction of the lesion, and a clinical evaluation determined the change in symptoms. A total of 9 patients were treated and had substantial reduction in the uterine size (average, 66 % volume reduction), and their primary symptoms have either improved or resolved. The authors concluded that this was the first reported review of interventional MRI-directed cryotherapy of uterine fibroid tumors. These preliminary findings need to be confirmed by well-designed studies.
Sakuhara et al (2006) evaluated the feasibility and effectiveness of MRI-guided percutaneous cryoablation for uterine fibroids as a minimally invasive treatment alternative. From August 2001 to June 2002, MRI-guided percutaneous cryoablation was performed on 7 uterine fibroids in 6 patients who displayed clinical symptoms related to tumors. Using a horizontal-type open MR system, cryoablation probes were percutaneously placed in fibroids. Fibroids were ablated, and the site and size of ice balls were monitored on MR I. Post-operatively, patients completed a questionnaire to assess changes in presenting clinical symptoms, and MR images were obtained for all patients at follow-up. Changes in clinical symptoms and tumor volume were evaluated in each patient. All treated patients showed reductions in tumor size. Mean volume reduction rate was 40.3 % at 6 weeks post-operatively, and 79.4 % at 9 to 12 months. All patients reported fever after treatment. Surgical drainage was required for abscess in the probe channel in 1 patient, and transient liver damage occurred in another. Subjective symptoms improved in all patients except 1 who had multiple tumors, and no patient complained of new symptoms after cryoablation during follow-up. The authors concluded that MRI-guided percutaneous cryoablation represents a feasible and effective treatment for uterine fibroids. These findings need to be confirmed by well-designed studies with more patients and longer-term follow-up.
Bergamin et al (2005) evaluated the feasibility and effectiveness of laparoscopic radiofrequency ablation (RFA) of uterine fibroids. A total of 18 women with symptomatic intramural uterine myomas underwent RFA under laparoscopic guidance. Post-operative sonographic evaluations of the fibroids size were scheduled at 1, 3, 6 , 9, and 12 months. The impact of myoma-related symptoms on quality of life (QOL) was assessed using a validated questionnaire. The median number of myomas treated per patient was 1 (1 to 3). The median baseline volume of the dominant myoma was 67.2 cm 3 (14.8 to 332.8). No intra-operative or post-operative complications occurred. The median reductions in myomas volume were 41.5 %, 59 %, and 77 % at 1, 3, and 6-months, follow-up evaluation, respectively. No further change in fibroid size was observed at 9 months and 1 year. A significant improvement in the symptoms score and QOL score was observed at 3 and 6 months, follow-up. The authors concluded that in this pilot study, laparoscopic RFA successfully reduced fibroid symptoms and fibroid volume in short-term follow-up. Moreover, they stated that additional studies are needed before its safety and effectiveness can be confirmed.
Milic et al (2006) reported the findings of 4 patients (with symptomatic uterine fibroids measuring less than 6 cm) who underwent laparoscopic ultrasound-guided RFA using multi-probe array electrodes. Follow-up of the treated fibroids was performed with gadolinium-enhanced MRI and patients' symptoms were assessed by telephone interviews. The procedure was initially technically successful in 3 of the 4 patients and MRI studies at 1 month demonstrated complete fibroid ablation. Symptom improvement, including a decrease in menstrual bleeding and pain, was achieved in 2 patients at 3 months. At 7 months, 1 of these 2 patients experienced symptom worsening that correlated with recurrent fibroid on MRI. The third, initially technically successfully treated patient did not experience any symptom relief after the procedure and was ultimately diagnosed with adenomyosis. The authors concluded that these preliminary findings suggested that RFA is a technically feasible treatment for symptomatic uterine fibroids in appropriately selected patients.
In a multi-center, pilot case-series study, Pansky and colleagues (2009) evaluated cryoablation of uterine fibroids using laparoscopically assisted placement of 17-gauge cryoablation needles. Patient satisfaction was documented with a validated Uterine Fibroid Symptom and Quality of Life (UFS-QOL) questionnaire. Procedural efficacy was evaluated by assessing fibroid shrinkage. Treatment was followed by assessments at 3, 6, and 12 months. Median fibroid volume reduction was 43.3 % (19 patients) and 66.4 % (15 patients) at 6 and 12 months, respectively. Median UFS-QOL score improvement was 61.9 % and 66.7 % at 6 and 12 months, respectively. Additionally, patients experienced marked improvement of bleeding and fibroid bulk symptoms. The median Symptom Severity Score at baseline was 50, 25.0 (-59 %) at 6 months, and 12.5 (-66.7 %) at 12 months. The authors concluded that these pilot data indicated that uterine fibroid cryoablation is a safe and effective minimally invasive alternative to treat symptomatic uterine fibroids. These preliminary findings need to be validated by well-designed studies.
The American College of Radiology’s clinical guideline on “Radiologic management of uterine leiomyomas” (Burke et al, 2012) rendered MRI-guided high-frequency focused ultrasound ablation a “2” rating for a woman with multiple uterine fibroids resulting in a 20-week-sized uterus on physical examination and menorrhagia; a “3” rating for a woman with multiple submucosal and intramural fibroids presenting with menorrhagia and pelvic pain; a “4’ rating for a woman with menometrorrhagia who presents with 3 dominant leiomyomas, ranging in size from 6 to 8 cm and intramural in location; a “3” rating for a woman with menorrhagia with a single 3 cm intramural fibroid and diffuse adenomyosis; a “3” rating for a woman with pelvic discomfort and 8 cm pedunculated subserosal fibroid; and a “3” rating for a woman with constipation and a 12 cm subserosal leiomyoma compressing the rectum (Rating scale: 1,2,3 denotes usually not appropriate; 4,5,6 denotes may be appropriate). Furthermore, the guideline stated that “To date, there is little long-term information on the efficacy of this technology”.
An UpToDate review on “Overview of treatment of uterine leiomyomas (fibroids)” (Stewart, 2013) states that “Magnetic resonance guided focused ultrasound surgery (MRgFUS) (e.g., ExAblate 2000) is a more recent option for the treatment of uterine leiomyomas in premenopausal women who have completed childbearing. This noninvasive thermoablative technique converges multiple waves of ultrasound energy on a small volume of tissue, which leads to its thermal destruction, and can be performed as an outpatient procedure. The maximum size of a leiomyoma for this procedure is uncertain. It is not typically size alone that limits treatment, but size, vascularity, access and other factors. This system is not indicated for leiomyomas which are resectable with a hysteroscope, heavily calcified, or when intervening bowel of bladder could be damaged by treatment. While desire for future pregnancy was originally a contraindication for this therapy, labeling for the device now allows treatment in women considering future pregnancy following counseling …. Studies are needed to determine long-term outcome and optimal candidates for this procedure; comparative studies are also needed”.
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