Use of Botulinum Toxin (Botox®) in Cases of Refractory Pelvic Floor Muscle Dysfunction

INTRODUCTION

Pelvic floor muscle (PFM) dysfunction is a sexual pain disorder characterized by involuntary spasm of pelvic floor muscles (PFMs) around the vagina that interferes with intercourse or any kind of vaginal penetration, making it impossible or extremely painful. Recently, researchers have shown increased interest in botulinum toxin (BoNTA) as an alternative option for refractory cases of PFM dysfunction, especially those that fail first-line treatments. Questions have been raised about the efficacy of BoNTA for the treatment of PFM dysfunction.

OBJECTIVES

To provide an updated and comprehensive review on the role of BoNTA in the management of refractory PFM dysfunction.

METHODS

We reviewed the literature using a systematic search strategy via PubMed and Google Scholar databases, to identify articles investigating the use of BoNTA in PFM dysfunction. We included studies that explored its indications, mechanism of action, injection dosing and technique, success rate, side effects, and contraindications.

RESULTS

We identified 20 relevant articles. Of these, 12 were original studies: 7 clinical trials, 1 retrospective cohort study and 4 case reports or case series. Doses of BoNTA that were used in these studies ranged between 20 and 500 units. The most commonly injected sites were levator ani muscles. Success rates varied between 62 and 100 %. Most studies showed no recurrence within 1 year after treatment. The majority of these studies used BoNTA after conventional first-line treatments have failed.

CONCLUSION

PFM dysfunction is a debilitating condition that adversely affects quality of life. There is promising evidence to support the use of BoNTA in cases of refractory PFM dysfunction. Further randomized controlled trials are warranted to standardize the use of BoNTA as a treatment option for these cases. Gari R, Alyafi M, Gadi RU, et al. Use of Botulinum Toxin (Botox) in Cases of Refractory Pelvic Floor Muscle Dysfunction. Sex Med Rev 2021;XX:XXX-XXX.

Sectional neuroanatomy of the pelvic floor

This is the sixth in a series of articles on the spine. The first 5 reviewed the sectional anatomy of the cervical, thoracic, and lumbosacral spines. This paper will review both the male and female pelves. Procedures performed in the pelvis include electromyography of the anal sphincter, pudendal and sacral nerve stimulator implants, and botulinum toxin type A injections into the prostate, the bladder, the urethra, and the anus. Complications from these procedures are rare. Electromyography in this region is particularly uncomfortable. Botulinum toxin type A denervation may result in local effects such as incontinence or urinary retention or rarely remote effects such as limb weakness. Neurostimulators may get infected or may fail. This article provides anatomically accurate schematics of innervations of the pelvis that can be used to interpret magnetic resonance images of muscles and nerves in the pelvic floor region. Cross-sectional schematics of the male and female pelves were drawn as they appear on imaging projections. The relevant nerves were color coded. The muscles and the skin surfaces were labeled and assigned the color of the appropriate nerves. An organized comprehensive map of the motor innervation of both the male and female pelves allows the physician to increase the accuracy and efficacy of interventional procedures. This anatomic map could also assist the electromyographer in correlating the clinical and electrophysiologic findings on magnetic resonance images.

Use by gynecologists of a modified sensate focus technique to treat vaginismus causing infertility

Of 5,341 infertile couples seen over an 8-year period, 76 (1.4%) had primary vaginismus, of whom 63 were treated with the use of a simplified sensate focus technique. There was complete symptomatic resolution of vaginismus in 60 women, and pregnancy was achieved in 33.