Take this simplified approach to correcting exposure of vaginal mesh
By proceeding stepwise, uncomplicated exposures lend themselves to the generalist’s care. Here are management pearls, cautions, and gauges of success.
IN THIS ARTICLE
CASE: Pain during intercourse, well after mesh implantation
Your patient, 61 years old, para 3, has come to your office by referral with a complaint of dyspareunia. The history includes placement of a synthetic vaginal mesh kit 14 months earlier for prolapse.
The medical record shows that the referring physician performed a “mesh excision” 1 year after the original procedure.
The woman reports that she is “very frustrated” that she is still dealing with this problem so long after the original procedure.
On examination, you note a 2.5-cm diameter area of exposed mesh in the anterior vagina, with healthy surrounding tissue and without inflammation or purulence (FIGURE 1). You are unable to reproduce her complaint of pain on vaginal examination.
What options can you offer to this woman? And will those options meet her therapeutic expectations?
FIGURE 1 Examination of your referred patient: Mesh is noticeably exposedThe recent increase in the use of mesh grafts to reconstruct pelvic anatomy has been directed mainly at improving surgical outcomes. Yet, at the same time, gynecologic surgeons find themselves facing a rise in associated complications of such surgery that they did not see previously.
Among the most troublesome and concerning of those complications are 1) exposure of mesh through the vaginal epithelium and 2) contraction or hardening of mesh (or both) that can result in dyspareunia and chronic pelvic pain. Other, rare complications include infection and fistula.
Our goal in this article is to address the management of graft-healing abnormalities in which a segment of the mesh is palpable or visible, or both, within the vaginal canal. Our focus is on simple abnormalities that can be managed by most generalist gynecologists; to be clear, more complex abnormalities, and those that provoke more serious or lasting symptoms, belong under the care of a specialist.
A recent shift in terminology is significant
Early on, this complication was called “erosion” as understanding of the mechanism of its development grew, however, terminology applied to the problem has changed.
In fact, mesh itself very rarely erodes into the vagina or an underlying viscus. Instead, the complication occurs most commonly as a result of disruption of a suture line—most likely the result of a hematoma or localized inflammation that develops postoperatively.
“Exposure” (our preference here) and “extrusion” are now the recommended terms, based on a consensus terminology document published this year jointly by the International Urogynecological Association and the International Continence Society.1
Exposure of implanted mesh is considered a “simple” healing abnormality because it typically
- occurs along the suture line and early in the course of healing
- is not associated with infection of the graft.2
The typical physical appearance is one of visible mesh along an open suture line without granulation tissue or purulence—again, see FIGURE 1. The mesh is firmly adherent to the vaginal epithelial edges and underlying fascia.
The reported incidence of mesh exposures—in regard to currently used meshes, which are all Type-1, monofilament, macroporous polypropylene grafts—is approximately 10% but as high as 15% to 20% in some reported series.3,4 The higher rates of exposure are usually seen in series in which some patients have had a synthetic graft implanted as an overlay to fascial midline plication. When the graft is implanted in the subfascial layer of the vaginal wall (i.e., without midline plication), however, the reported rate of exposure falls—to 5% to 10%.5-7
Recommendations for management
Initially, recommendations for “erosion” management were based on concerns about underlying mesh infection or rejection, and included a need to remove the entire graft. That recommendation still applies to multifilament, microporous grafts that present with inflammatory infiltrates, granulation tissue, and purulence. Although these kinds of grafts (known as “Type-2/3 grafts”—e.g., GoreTex, IVS) have not been marketed for pelvic reconstruction over the past 3 to 5 years, their behavior post-implantation is less predictable—and patients who have delayed healing abnormalities are, therefore, still being seen. It’s fortunate that development of an overlying biofilm prevents tissue incorporation into these types of graft, allowing them to be removed easily.
Exposures related to Type-1 mesh—currently used in pelvic reconstruction—that occur without surrounding infection do not require extensive removal. Rather, they can be managed conservatively or, when necessary, with outpatient surgery. In patients who are not sexually active, exposures are usually asymptomatic; they might only be observed by the physician on vaginal examination and are amenable to simple monitoring. In sexually active patients, exposure of Type-1 mesh usually results in dyspareunia or a complaint that the partner “can feel the mesh.” Depending on the size and the nature of symptoms and the extent of the defect, these commonly seen exposures can be managed by following a simple algorithm.
Palpable or visible mesh fibrils can be trimmed in the office; they might even respond to local estrogen alone. Consider these options if the patient displays vaginal atrophy.
Typically, vaginal estrogen is prescribed as 1 g nightly for 2 weeks and then 1 g two or three nights a week. Re-examine the patient in 3 months; if symptoms of mesh exposure persist, it’s unlikely that continued conservative therapy will be successful, and outpatient surgery is recommended.
When exposure is asymptomatic, you can simply monitor the condition for 3 to 6 months; if complaints or findings arise, consider intervention.
Small (<0.5 cm in diameter) exposures can also be managed in the office, including excision of exposed mesh and local estrogen. If the exposure is easily reachable, we recommend grasping the exposed area with pick-ups or a hemostat and with gentle traction, using Metzenbaum scissors to trim exposed mesh as close to the vaginal epithelium as possible. Local topical or injected anesthesia may be needed. Bleeding should be minimal because no dissection is necessary. Silver nitrate can be applied for any minor bleeding. Larger (0.5–4.0 cm) exposures are unlikely to heal on their own. They require outpatient excision in the operating room.
Preoperative tissue preparation with local estrogen is key to successful repair of these exposures. Vaginal estrogen increases blood flow to the epithelium; as tissue becomes well-estrogenized, risk of recurrence diminishes.
The technique we employ includes:
- circumferential infiltration of vaginal epithelium surrounding the exposed mesh with 1% lidocaine with epinephrine
- sharp circumscription of the area of exposure, using a scalpel, with a 0.5-cm margin of vaginal epithelium (FIGURE 2)
- wide dissection, with undermining and mobilization of surrounding healthy vaginal epithelium around the exposure (FIGURE 3)
- excision of the exposed mesh and attached vaginal mucosa, with careful dissection of the mesh off underlying tissues with Metzenbaum scissors—being careful to avoid injury to underlying bladder or rectum (FIGURE 4)
- reapproximation of mesh edges, using 2-0 polypropylene suture to close the resulting defect so that prolapse does not recur (FIGURE 5)
- closing of the previously mobilized vaginal epithelium with 2-0 Vicryl suture, without tension, to cover the reapproximated mesh edges—after irrigation and assurance of adequate hemostasis (FIGURE 6).
FIGURE 2 Incision of vaginal epithelium
Allow for a 0.5-cm margin.
FIGURE 3 Undermining and mobilization of epithelium
Perform wide dissection.
FIGURE 4 Dissection of mesh from underlying tissue
Keep clear of underlying bladder and rectum!
FIGURE 5 Reapproximation of edges to re-establish support
Our choice of suture is 2-0 polypropylene.
FIGURE 6 Irrigation of vaginal epithelium, followed by closure
Before you close, ensure that hemostasis is adequate.The choice of closure—vertical or horizontal—depends on the nature of the original defect.
Several cautions should be taken with this technique, including:
- avoiding narrowing the vaginal canal
- minimizing trauma to healthy vaginal epithelium that will be used for closure
- maintaining hemostasis to avoid formation of hematomas.
Largest (>4 cm) exposures are likely the result of devascularized sloughing of vaginal epithelium. They are, fortunately, uncommon.
It’s unlikely that, after excision of exposed mesh, the vaginal epithelial edges can be approximated without significantly narrowing or shortening the vaginal canal. Proposed techniques for managing these large exposures include covering the defect with a biologic graft, such as small intestinal submucosa, to allow epithelium to re-grow. Regrettably, prolapse is likely to recur in the unprotected area that results.
Hardening and contraction typically occur along the fixation arms of the mesh. These complications might result from mesh shrinkage or from mesh being placed too tight, so to speak, at implantation. Rarely does the entire implanted mesh contract.
Severe mesh contraction can result in localized pain and de novo dyspareunia. Symptoms usually resolve after identification of the painful area and removal of the involved mesh segment.8
Diagnostic maneuver. In-office trigger-point injection of bupivacaine with triamcinolone is useful to accurately identify the location of pain that is causing dyspareunia. After injection, the patient is asked to return home and resume sexual intercourse; if dyspareunia diminishes significantly, surgical removal of the involved mesh segment is likely to ameliorate symptoms.
If dyspareunia persists after injection, however, the problem either 1) originates in a different location along the graft or 2) may not be related to the mesh—that is, it may be introital pain or preexisting vaginal pain.
The findings of trigger-point injection and a subsequent trial of sexual intercourse are useful for counseling the patient and developing realistic expectations that surgery will be successful.
Management note: Mesh contraction should be managed by a surgeon who is experienced in extensive deep pelvic dissection, which is necessary to remove the mesh arms.
Diffuse vaginal pain after mesh implantation is unusual; typically, the patient’s report of pain has been preceded by recognition of another, underlying pelvic pain syndrome. Management of such pain is controversial, and many patients will not be satisfied until the entire graft is removed. Whether such drastic intervention actually resolves the pain is unclear; again, work with the patient to create realistic expectations before surgery—including the risk that prolapse will recur and that reoperation will be necessary.
Management note: An existing pelvic pain syndrome should be considered a relative contraindication to implantation of mesh.
Infection of the graft
Rarely, infection has been reported after implantation of Type-1 mesh—the result of either multi-microbial colonization or isolated infection by Bacteriodes melaninogenicus, Actinomyces spp, or Staphylococcus aureus. Untreated preoperative bacterial vaginitis is likely the underlying cause, and should be considered a contraindication to mesh implantation.
Typically, these patients complain of vaginal discharge and bleeding early postoperatively. Vaginal exposure of the mesh results from local inflammation and necrosis of tissue.
Management note: In these cases, it is necessary to 1) prescribe antimicrobial therapy that covers gram-negative and anaerobic bacteria and 2) undertake surgical removal of the exposed mesh, as we outlined above.9
Visceral erosion or fistula
Many experts believe that what is recorded as “erosion” of synthetic mesh into bladder or rectum is, in fact, a result of unrecognized visceral perforation at original implantation. This is a rare complication of mesh implantation.
Patients who experience mesh erosion into the bladder may have lower urinary-tract symptoms (LUTS) of urgency, frequency, dysuria, and hematuria. Any patient who reports de novo LUTS in the early postoperative period after a vaginal mesh procedure should receive office cystourethroscopy to ensure that no foreign body is present in the bladder or urethra.
Management note: Operative cystourethroscopy, with removal of exposed mesh, is the management of choice when mesh is found in the bladder or urethra.
Patients who have constant urinary or fecal incontinence immediately after surgery should be evaluated for vesicovaginal or rectovaginal fistula.
The presence of any of these complications necessitates removal of the involved mesh in its entirety, with concomitant repair of fistula. Typically, the procedures are performed by a specialist.
Our experience with correcting simple mesh exposures
During the past year at our tertiary referral center, 26 patients have undergone mesh revision because of exposure, using the technique we described above (FIGURE 2-6). The problem resolved in all; none had persistent dyspareunia. Many of these patients had already undergone attempts at correction of the exposure elsewhere—mostly, in the office, using techniques appropriate for that setting. Prolapse has not recurred in the 10 patients who required reapproximation of mesh edges because of a defect >2.5 cm.