Uterine artery embolization | |
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![]() Arteries of the female reproductive tract (posterior view): uterine artery, ovarian artery and vaginal arteries | |
Specialty | Interventional radiology |
Uterine artery embolization (UAE, uterine fibroid embolization, or UFE) is a procedure in which an interventional radiologist uses a catheter to deliver small particles that block the blood supply to the uterine body. The procedure is primarily done for the treatment of uterine fibroids and adenomyosis. [1] [2] Compared to surgical treatment for fibroids such as a hysterectomy, in which a woman's uterus is removed, uterine artery embolization may be beneficial in women who wish to retain their uterus. Other reasons for uterine artery embolization are postpartum hemorrhage and uterine arteriovenous malformations. [3]
Uterine fibroids are the most common type of benign uterine tumor and are composed of smooth muscle. [4] They often cause bulk-related symptoms, which can be characterized by back pain, heaviness in the pelvic area, abdominal bloating. [5] Uterine artery embolization may be done to treat bothersome bulk-related symptoms as well as abnormal or heavy uterine bleeding due to uterine fibroids. Fibroid size, number, and location are three potential predictors of a successful outcome. [6] [7] [8] Specifically, studies have demonstrated that submucosal (directly underneath the uterine lining) fibroids demonstrated the largest reduction in size while subserosal (outer layer of the uterus) had the smallest reduction. [9]
Uterine artery embolization may also be appropriate for the treatment of adenomyosis, which is when the lining of the uterus aberrantly grows into the muscle of the uterus. [10] Symptoms of adenomyosis include heavy or prolonged menstrual bleeding and painful menstrual periods. [11]
Uterine artery embolization can also be used to control heavy uterine bleeding for reasons other than fibroids, such as postpartum obstetrical hemorrhage. [12] Many women who experience postpartum hemorrhage may be successfully treated with medication or uterine balloon tamponade. [13] However, in cases where women continue to bleed, uterine artery embolization may be an appropriate option.
A less common indication for uterine artery embolization is for the treatment of uterine arteriovenous malformations which can be a cause of abnormal uterine bleeding or life-threatening bleeding. Roughly half of women with uterine arteriovenous malformations are born with them while the remaining form following surgical interventions or may be due to uterine tumors. [3]
Prior to undergoing UAE, the patient should be evaluated for the following absolute contra-indications to the procedure: a viable pregnancy, a current infection that is not being treated, or gynecologic malignancy (except for cases where UAE is being used as a procedure in addition to treatment for the cancer). [14] Relative contra-indications for the procedure include a severe contrast allergy since contrast is necessary to visualize the arteries during the procedure, kidney impairment since contrast may cause damage to the kidneys, or coagulopathy (blood disorder that causes prolonged or excessive bleeding). [15] However, all of the stated relative contra-indications can be managed with appropriate pre-operative planning.
The rate of serious complications is comparable to that of myomectomy or hysterectomy. The advantage of somewhat faster recovery time is offset by a higher rate of minor complications and an increased likelihood of requiring surgical intervention within two to five years of the initial procedure. [16] An analysis of 15,000 women found that those who had myomectomy required fewer additional procedures, including hysterectomies, to treat fibroids over the next five years than those who had uterine artery embolization. [17] [18]
Complications include the following:
Prior to a uterine artery embolization, patients should undergo a clinic visit with their gynecologist, have a recent Pap smear, and an endometrial biopsy in cases where abnormal uterine bleeding is a presenting symptom. [27] A clinic visit can then be made with the interventional radiologist performing the uterine artery embolization so that a thorough history and physical exam can be taken. Recent diagnostic imaging such as a pelvic magnetic resonance imaging (MRI) should also be reviewed by the interventional radiologist to rule out possible malignancy, evaluate uterine anatomy, and discuss the likelihood of fibroid passage with the patient. [27]
The procedure is performed by an interventional radiologist under conscious sedation. [25] Access is commonly through the radial or femoral artery via the wrist or groin, respectively. [3] [25] After anesthetizing the skin over the artery of choice, the artery is accessed by a needle puncture using the Seldinger technique. [25] Under fluoroscopic guidance, a catheter is then introduced into the artery and used to select the uterine vessels for subsequent embolization. Once at the level of the uterine artery an angiogram with contrast is performed to confirm placement of the catheter, and the embolizing agent (spheres or beads) is released. As more embolizing agent is administered, blood flow will slow down significantly. Over time, the decreased blood flow causes the fibroid to shrink. Both the left and right uterine arteries are embolized since unilateral UAEs have a high risk of failure. [28] The procedure can be performed in a hospital or surgical center. More recently, there has been support for UAE as an outpatient procedure, but many doctors choose an overnight admission for pain control. [29] Follow-up for the procedure may vary based on institution, but can include a clinic appointment at 1 to 3 months following the procedure and an MRI to see if the fibroids have shrunk from the preoperative MRI. [9]
The vast majority of women who undergo UAE experience elimination of abnormal uterine bleeding and improvement in bulk symptoms. [15] Additionally, patient satisfaction following the procedure is about 80%. [14] One drawback of UAE is that it appears to require more repeat procedures than if surgery was done initially. [30] However, long-term patient satisfaction outcomes of UAE are similar to that of surgery and a short-term benefit is the reduction in hospital stay with UAE. [30] [15]
Currently the number of studies that compare pregnancy rates between UAE and myomectomy are limited. However, a 2020 systematic review assessing pregnancy outcomes after UAE for fibroids demonstrated that pregnancy rates between UAE and myomectomy are comparable. Additionally, they found that rates of pregnancy-related complications in women who underwent UAE were similar to that of the general population. [31] Despite these findings, there is still a lack of randomized control trials that directly compare the outcomes of myomectomy and UAE for fibroids, so future studies are needed to determine which procedure yields better results.
For women with adenomyosis, the data regarding outcomes is limited. However, studies have demonstrated that about 83% of women with adenomyosis experienced an improvement in their symptoms. Additionally, the rate of improvement in symptoms increased to about 93% in women who had both adenomyosis and fibroids.
Regarding cost, the American Journal of Gynecology reports that uterine artery embolization costs 12% less than hysterectomy and 8% less than myomectomy. [32]
UAE was used for the first time in 1979 to control bleeding in a woman with postpartum hemorrhage that did not improve after surgical treatment. [33] Since then studies have shown that UAE is a safe and effective procedure for postpartum hemorrhage with control of bleeding in greater than 90% of women. [34] The initial use of UAE for patients with fibroids was to limit bleeding during myomectomy. [35] During the 1990s, doctors began expanding the indications for UAE and started using it for the treatment of the fibroids specifically. [36] Previously, the primary treatment methods for fibroids were myomectomy or hysterectomy. Compared to surgery, UAE can be advantageous because blood loss is typically minimal, surgery and general anesthesia is avoided, recovery is shorter, and women can retain their uterus (relative to hysterectomy). [37] UAE is thought to treat fibroids by selectively decreasing blood flow to the tumor since it is highly vascular, which causes improvement in abnormal bleeding and the bulk symptoms that are often experienced with fibroids.
For removing uterine fibroids, myomectomy and uterine artery embolisation seem to be equally effective in improving quality of life, as measured 4-yours after surgery. [38] [39]
Hysterectomy is the surgical removal of the uterus and cervix. Supracervical hysterectomy refers to removal of the uterus while the cervix is spared. These procedures may also involve removal of the ovaries (oophorectomy), fallopian tubes (salpingectomy), and other surrounding structures. The term “partial” or “total” hysterectomy are lay-terms that incorrectly describe the addition or omission of oophorectomy at the time of hysterectomy. These procedures are usually performed by a gynecologist. Removal of the uterus renders the patient unable to bear children and has surgical risks as well as long-term effects, so the surgery is normally recommended only when other treatment options are not available or have failed. It is the second most commonly performed gynecological surgical procedure, after cesarean section, in the United States. Nearly 68 percent were performed for conditions such as endometriosis, irregular bleeding, and uterine fibroids. It is expected that the frequency of hysterectomies for non-malignant indications will continue to fall given the development of alternative treatment options.
Interventional radiology (IR) is a medical specialty that performs various minimally-invasive procedures using medical imaging guidance, such as x-ray fluoroscopy, computed tomography, magnetic resonance imaging, or ultrasound. IR performs both diagnostic and therapeutic procedures through very small incisions or body orifices. Diagnostic IR procedures are those intended to help make a diagnosis or guide further medical treatment, and include image-guided biopsy of a tumor or injection of an imaging contrast agent into a hollow structure, such as a blood vessel or a duct. By contrast, therapeutic IR procedures provide direct treatment—they include catheter-based medicine delivery, medical device placement, and angioplasty of narrowed structures.
Heavy menstrual bleeding (HMB), previously known as menorrhagia or hematomunia, is a menstrual period with excessively heavy flow. It is a type of abnormal uterine bleeding (AUB).
Abnormal uterine bleeding (AUB), also known as atypical vaginal bleeding (AVB), is vaginal bleeding from the uterus that is abnormally frequent, lasts excessively long, is heavier than normal, or is irregular. The term dysfunctional uterine bleeding was used when no underlying cause was present. Vaginal bleeding during pregnancy is excluded. Iron deficiency anemia may occur and quality of life may be negatively affected.
Embolization refers to the passage and lodging of an embolus within the bloodstream. It may be of natural origin (pathological), in which sense it is also called embolism, for example a pulmonary embolism; or it may be artificially induced (therapeutic), as a hemostatic treatment for bleeding or as a treatment for some types of cancer by deliberately blocking blood vessels to starve the tumor cells.
Adenomyosis is a medical condition characterized by the growth of cells that proliferate on the inside of the uterus (endometrium) atypically located among the cells of the uterine wall (myometrium), as a result, thickening of the uterus occurs. As well as being misplaced in patients with this condition, endometrial tissue is completely functional. The tissue thickens, sheds and bleeds during every menstrual cycle.
Vaginal bleeding is any expulsion of blood from the vagina. This bleeding may originate from the uterus, vaginal wall, or cervix. Generally, it is either part of a normal menstrual cycle or is caused by hormonal or other problems of the reproductive system, such as abnormal uterine bleeding.
Uterine fibroids, also known as uterine leiomyomas, fibromyoma or fibroids, are benign smooth muscle tumors of the uterus, part of the female reproductive system. Most people with fibroids have no symptoms while others may have painful or heavy periods. If large enough, they may push on the bladder, causing a frequent need to urinate. They may also cause pain during penetrative sex or lower back pain. Someone can have one uterine fibroid or many. It is uncommon but possible that fibroids may make it difficult to become pregnant.
Myomectomy, sometimes also called fibroidectomy, refers to the surgical removal of uterine leiomyomas, also known as fibroids. In contrast to a hysterectomy, the uterus remains preserved and the woman retains her reproductive potential. It still may impact hormonal regulation and the menstrual cycle.
Adenomyoma is a tumor (-oma) including components derived from glands (adeno-) and muscle (-my-). It is a type of complex and mixed tumor, and several variants have been described in the medical literature. Uterine adenomyoma, the localized form of uterine adenomyosis, is a tumor composed of endometrial gland tissue and smooth muscle in the myometrium. Adenomyomas containing endometrial glands are also found outside of the uterus, most commonly on the uterine adnexa but can also develop at distant sites outside of the pelvis. Gallbladder adenomyoma, the localized form of adenomyomatosis, is a polypoid tumor in the gallbladder composed of hyperplastic mucosal epithelium and muscularis propria.
Endometrial ablation is a surgical procedure that is used to remove (ablate) or destroy the endometrial lining of the uterus. The goal of the procedure is to decrease the amount of blood loss during menstruation (periods). Endometrial ablation is most often employed in people with excessive menstrual bleeding following unsuccessful medical therapy. It is less effective than hysterectomy, but with a lower risk of adverse events.
Placenta accreta occurs when all or part of the placenta attaches abnormally to the myometrium. Three grades of abnormal placental attachment are defined according to the depth of attachment and invasion into the muscular layers of the uterus:
The uterine artery is an artery that supplies blood to the uterus in females.
Uterine atony is the failure of the uterus to contract adequately following delivery. Contraction of the uterine muscles during labor compresses the blood vessels and slows flow, which helps prevent hemorrhage and facilitates coagulation. Therefore, a lack of uterine muscle contraction can lead to an acute hemorrhage, as the vasculature is not being sufficiently compressed. Uterine atony is the most common cause of postpartum hemorrhage, which is an emergency and potential cause of fatality. Across the globe, postpartum hemorrhage is among the top five causes of maternal death. Recognition of the warning signs of uterine atony in the setting of extensive postpartum bleeding should initiate interventions aimed at regaining stable uterine contraction.
Postpartum bleeding or postpartum hemorrhage (PPH) is often defined as the loss of more than 500 ml or 1,000 ml of blood following childbirth. Some have added the requirement that there also be signs or symptoms of low blood volume for the condition to exist. Signs and symptoms may initially include: an increased heart rate, feeling faint upon standing, and an increased breathing rate. As more blood is lost, the patient may feel cold, blood pressure may drop, and they may become restless or unconscious. In severe cases circulatory collapse, disseminated intravascular coagulation and death can occur. The condition can occur up to twelve weeks following delivery in the secondary form. The most common cause is poor contraction of the uterus following childbirth. Not all of the placenta being delivered, a tear of the uterus, or poor blood clotting are other possible causes. It occurs more commonly in those who already have a low amount of red blood, are Asian, have a larger fetus or more than one fetus, are obese or are older than 40 years of age. It also occurs more commonly following caesarean sections, those in whom medications are used to start labor, those requiring the use of a vacuum or forceps, and those who have an episiotomy.
Reproductive surgery is surgery in the field of reproductive medicine. It can be used for contraception, e.g. in vasectomy, wherein the vasa deferentia of a male are severed, but is also used plentifully in assisted reproductive technology. Reproductive surgery is generally divided into three categories: surgery for infertility, in vitro fertilization, and fertility preservation.
An interstitial pregnancy is a uterine but ectopic pregnancy; the pregnancy is located outside the uterine cavity in that part of the fallopian tube that penetrates the muscular layer of the uterus. The term cornual pregnancy is sometimes used as a synonym, but remains ambiguous as it is also applied to indicate the presence of a pregnancy located within the cavity in one of the two upper "horns" of a bicornuate uterus. Interstitial pregnancies have a higher mortality than ectopics in general.
Prostatic artery embolization is a non-surgical technique for treatment of benign prostatic hyperplasia (BPH).
Anna-Maria Belli, MD, FCIRSE is a British interventional radiologist known for her work in vascular interventional radiology and for holding leadership positions in interventional radiology societies in Britain and Europe.
Hemorrhoidal artery embolization is a non-surgical treatment of internal hemorrhoids.