Active and Passive Components of Pelvic Floor Muscle Tone in Women with Provoked Vestibulodynia: A Perspective Based on a Review of the Literature

Vulvodynia: A practical guide in treatment strategies

Vulvodynia is a debilitating condition characterized by chronic vulvar pain, with a detrimental impact on the patient's overall quality of life. Its etiology is multifactorial, but still in the process of being clearly outlined. Vulvodynia is not a single entity. It is a heterogeneous condition characterized by multiple triggers, making it challenging to define a reference standard for its treatment. In this manuscript we selected all articles including the following key criteria: "vulvodynia". The primary outcomes observed included the resolution of chronic pelvic pain, dyspareunia and sexual satisfaction, psychological well-being, and overall quality of life. Most pharmacologic treatments require further evidence to be recommended. On the other hand, non-pharmacologic approaches such as psychotherapy, physical therapy, and surgery have received stronger support. This review summarizes pros and cons of adopting available treatments. Multimodal approaches should be introduced to improve patient outcomes. Further investigations are warranted to improve patients' quality of life.

Fear Learning in Genital Pain: Toward a Biopsychosocial, Ecologically Valid Research and Treatment Model

Although fear learning mechanisms are implicated in the development, maintenance, exacerbation, and reduction of genital pain, systematic research on how fear of genital pain emerges, spreads, persists, and reemerges after treatment is lacking. This paper provides an overview of the literature on pain-related fear, integrates the ideas on learning and sexual arousal responding, and specifies the pathways through which compromised learning may contribute to the development and persistence of genital pain. In order to refine theories of genital pain and optimize treatments, we need to adopt a biopsychosocial framework to pain-related fear learning and uncover potential moderators that shape individual trajectories. This involves examining the role of physiological processes, subjective experiences, as well as partner and relational cues in fear acquisition, excessive generalization and impaired safety learning, extinction of fear, counterconditioning, and return of fear. Recent methodological advances in fear conditioning and sex research are promising to enable more symptom-specific and ecologically valid experimental paradigms.

Postpartum dyspareunia: clinical evaluation, causes, and treatment outcomes

BACKGROUND

Dyspareunia affects approximately half of postpartum women and is attributed to multiple factors. Despite its high prevalence and resultant negative effects, data are lacking regarding the causes and different pain components, the usefulness of recommended treatments, and the prognosis.

AIM

To evaluate causes of postpartum dyspareunia, targeted treatment modalities, and their effectiveness.

METHODS

A retrospective observational study was conducted of women diagnosed with postpartum dyspareunia between September 2008 and January 2017 at a single designated vulvovaginal disorder clinic. The inclusion criterion was complaint of painful intercourse commencing postdelivery. The cohort was divided into 4 groups based on the causes of dyspareunia: muscle hypertonicity, scar tenderness, vestibular tenderness, and atrophy.

OUTCOMES

The following were assessed for each group: patient background demographics, clinical and obstetric data, physical findings, recommended therapy, adherence to the suggested treatment, level of improvement at follow-up visits, and length of time until maximal improvement.

RESULTS

A hundred women met the inclusion criterion; the majority (n = 60) presented with >1 causative factor. The most common finding was vestibular tenderness (n = 78, 78%), which was significantly associated with atrophy (adjusted odds ratio [aOR], 15.08; 95% CI, 2.45-93.35), contraceptive usage (aOR, 4.76; 95% CI, 1.07-21.39), and primiparity (aOR, 4.89; 95% CI, 1.01-23.88). Episiotomy was the only risk factor for scar tenderness (aOR, 5.43; 95% CI, 1.20-24.53), while the existence of a spontaneous perineal tear was not. No specific correlation was found with pelvic floor muscle hypertonicity. Targeted treatment resulted in significant improvement in most patients.

CLINICAL IMPLICATIONS

A targeted diagnostic and treatment approach for postpartum dyspareunia is effective and can be beneficial for caregivers treating postpartum women.

STRENGTHS AND LIMITATIONS

A uniform and consistent protocol for patient selection and management is a major strength, which magnifies the clinical implication of our findings. The retrospective nature of the study is the primary limitation.

CONCLUSION

Postpartum dyspareunia is a common problem; however, many women refrain from discussing it with their providers. Therefore, it is important to assess this condition with all women during the postpartum visit as targeted diagnosis and treatment can significantly improve outcomes.

Is there a difference in pelvic floor muscle tone between women with and without pelvic pain? A systematic review and meta-analysis

BACKGROUND

Alterations in pelvic floor muscle (PFM) function have been observed in women with persistent noncancer pelvic pain (PNCPP) as compared with women without PNCPP; however, the literature presents conflicting findings regarding differences in PFM tone between women with and without PNCPP.

AIM

To systematically review the literature comparing PFM tone in women with and without PNCPP.

METHODS

MEDLINE, Embase, Emcare, CINAHL, PsycINFO, and Scopus were searched from inception to June 2021 for relevant studies. Studies were included that reported PFM tone data in women aged ≥18 years with and without PNCPP. The risk of bias was assessed with the National Heart, Lung, and Blood Institute Quality Assessment Tool. Standardized mean differences (SMDs) for PFM tone measures were calculated via random effects models.

OUTCOMES

Resting PFM tone parameters, including myoelectrical activity, resistance, morphometry, stiffness, flexibility, relaxation, and intravaginal pressure, measured by any clinical examination method or tool.

RESULTS

Twenty-one studies met the inclusion criteria. Seven PFM tone parameters were measured. Meta-analyses were conducted for myoelectrical activity, resistance, and anterior-posterior diameter of the levator hiatus. Myoelectrical activity and resistance were higher in women with PNCPP than in women without (SMD = 1.32 [95% CI, 0.36-2.29] and SMD = 2.05 [95% CI, 1.03-3.06], respectively). Women with PNCPP also had a smaller anterior-posterior diameter of the levator hiatus as compared with women without (SMD = -0.34 [95% CI, -0.51 to -0.16]). Meta-analyses were not performed for the remaining PFM tone parameters due to an insufficient number of studies; however, results of these studies suggested greater PFM stiffness and reduced PFM flexibility in women with PNCPP than in women without.

CLINICAL IMPLICATIONS

Available evidence suggests that women with PNCPP have increased PFM tone, which could be targeted by treatments.

STRENGTHS AND LIMITATIONS

A comprehensive search strategy was used with no restriction on language or date to review studies evaluating PFM tone parameters between women with and without PNCPP. However, meta-analyses were not undertaken for all parameters because few included studies measured the same PFM tone properties. There was variability in the methods used to assess PFM tone, all of which have some limitations.

CONCLUSION

Women with PNCPP have higher PFM tone than women without PNCPP; therefore, future research is required to understand the strength of the relationship between pelvic pain and PFM tone and to investigate the effect of treatment modalities to reduce PFM tone on pelvic pain in this population.

High-Intensity Laser Therapy (HILT) as an Emerging Treatment for Vulvodynia and Chronic Musculoskeletal Pain Disorders: A Systematic Review of Treatment Efficacy

High-intensity laser therapy (HILT) has been gaining popularity in the treatment of chronic musculoskeletal pain, including vulvodynia. The objective of this study was to critically appraise and synthesize the available evidence on the efficacy of HILT for reducing pain and improving function in vulvodynia and other chronic primary musculoskeletal pain conditions. Electronic databases and the grey literature were searched. Effects on pain intensity, function, and adverse events were assessed. One study investigating HILT in the treatment of vulvodynia and 13 studies on the treatment of chronic musculoskeletal pain were selected. The study assessing vulvodynia showed favorable results for reducing pain. Regarding chronic musculoskeletal pain, 12 out of the 13 studies selected consistently showed that HILT was more effective than the placebo/active comparator for reducing pain and improving function. The available effect sizes for pain showed large to huge effects. Similar effects were observed for function except for two studies showing moderate effects. The GRADE score was moderate. Conclusions: There are insufficient data to support the use of HILT in vulvodynia, but the promising results encourage further research. HILT appears to be effective in musculoskeletal pain conditions. More high-quality studies are needed to identify effective laser protocols.

The Most Common Functional Disorders and Factors Affecting Female Pelvic Floor

The pelvic floor (PF) is made of muscles, ligaments, and fascia, which ensure organ statics, maintain muscle tone, and are involved in contractions. This review describes the myofascial relationships of PF with other parts of the body that determine the proper functions of PF, and also provides insight into PF disorders and the factors contributing to them. PF plays an important role in continence, pelvic support, micturition, defecation, sexual function, childbirth, and locomotion, as well as in stabilizing body posture and breathing, and cooperates with the diaphragm and postural muscles. In addition, PF associates with distant parts of the body, such as the feet and neck, through myofascial connections. Due to tissue continuity, functional disorders of muscles, ligaments, and fascia, even in the areas that are distant from PF, will lead to PF disorders, including urinary incontinence, fecal incontinence, prolapse, sexual dysfunction, and pain. Dysfunctions of PF will also affect the rest of the body.

Absolute and Relative Reliability of the Assessment of the Muscle Mechanical Properties of Pelvic Floor Muscles in Women with and without Urinary Incontinence

An analysis of the muscle mechanical properties (MMPs) of the pelvic floor muscles (PFMs) is relevant for understanding the physiopathology of urinary incontinence (UI). However, there is no objective and reliable methodology currently available for quantifying the MMPs of PFMs. Thus, the objective was to determine the intra-rater and inter-rater reliability of the MMPs of PFM assessment with a hand-held tonometer device, called the MyotonPRO, in young women with and without UI. Sociodemographic and pelvic floor questionnaires, plus MMPs of PFMs were assessed in 38 nulliparous women with UI and 40 matched healthy women by two trained physiotherapists on two different occasions, 48-72 h apart. Good to excellent absolute reliability was found for tone, stiffness, and decrement of both intra- and inter-rater analyses in both study groups (Intraclass Correlation Coefficient ranged from 0.75 to 0.92), with a trend of lower values for relaxation and creep. The standard error of measurement (SEM) did not achieve 10% of the mean values for any MMPs. The minimum detectable change (MDC) values were also provided for clinical applications. In conclusion, the relative reliability of tone, stiffness, and the assessment of the decrement of PFMs with MyotonPRO is good to excellent for UI and healthy women. The SEM and MDC values were acceptable for their application in clinical settings.

The Female Pelvic Floor Fascia Anatomy: A Systematic Search and Review

The female pelvis is a complex anatomical region comprising the pelvic organs, muscles, neurovascular supplies, and fasciae. The anatomy of the pelvic floor and its fascial components are currently poorly described and misunderstood. This systematic search and review aimed to explore and summarize the current state of knowledge on the fascial anatomy of the pelvic floor in women. Methods: A systematic search was performed using Medline and Scopus databases. A synthesis of the findings with a critical appraisal was subsequently carried out. The risk of bias was assessed with the Anatomical Quality Assurance Tool. Results: A total of 39 articles, involving 1192 women, were included in the review. Although the perineal membrane, tendinous arch of pelvic fascia, pubourethral ligaments, rectovaginal fascia, and perineal body were the most frequently described structures, uncertainties were identified in micro- and macro-anatomy. The risk of bias was scored as low in 16 studies (41%), unclear in 3 studies (8%), and high in 20 studies (51%). Conclusions: This review provides the best available evidence on the female anatomy of the pelvic floor fasciae. Future studies should be conducted to clarify the discrepancies highlighted and accurately describe the pelvic floor fasciae.

Linking Pelvic Floor Muscle Function Terminology to the International Classification of Functioning, Disability and Health

OBJECTIVE

A previous systematic review on pelvic floor muscle function (PFMF) identified a miscellaneity of terms. The lack of consensual terminology might have come from the complexity of neuromusculoskeletal function itself. This study sought to link the previously identified PFMF terms to the International Classification of Functioning, Disability and Health (ICF) terminology.

METHODS

In this secondary analysis study, 10 linkage rules were applied to link 196 previously identified PFMF terms to the ICF. Two researchers performed the linking process independently. Disagreements were solved by open dialogue with a third researcher. Percentage agreement was computed for main outcome.

RESULTS

A total of 184 (93.9%) PFMF terms were subsumed into the following 6 ICF terms: tone, involuntary movement reaction, control, coordination, strength, and endurance. The most frequently investigated PFMF was strength (25.5%), followed by involuntary movement reaction (22.9%), endurance (17.2%), control (14.1%), coordination (9.9%), and tone (4.2%). Only 6.2% PFMF could not be linked to ICF terminology. A wide variation of instruments/methods was used to measure PFMF. Vaginal palpation was the only method employed to measure all 6 PFMF. Percentage agreement between raters was 100%.

CONCLUSIONS

Linking PFMF terminology to the ICF was feasible and valid. It allowed the identification of the most investigated PFMF and their measuring methods. ICF terminology to describe PFMF should be used since it may improve communication, data gathering, and the advance in scientific knowledge.

IMPACT

Standardized terminology anchored in a theoretical framework is crucial to data gathering, communication, and dissemination of evidence-based practice. PFMF terminology based on ICF can be used to improve data pooling and communication.

Botulinum injections for myofascial pelvic pain

INTRODUCTION AND HYPOTHESIS

The aim of this study was to assess the impact of botulinum toxin injection in women with myofascial pelvic pain (MFPP) syndrome of the pelvic floor who had failed conservative treatment.

METHODS

This was a retrospective descriptive observational study of 48 consecutive patients receiving botulinum toxin to the pelvic floor for MFPP syndrome in a tertiary teaching hospital over an 8-year period. Trigger points were identified, and botulinum toxin was injected into the pelvic floor at the trigger points in doses ranging from 50 to 200 units. The patient-reported global impression of improvement scale was used to evaluate the success at follow-up, and adverse effects were recorded.

RESULTS

Forty-six women attended for follow-up at 3-6 months. Of these, 34 (74%) reported an improvement in their symptoms (slightly better, much better, very much better), 12 (26%) had no change, and no patients reported worsening of symptoms. One patient (2%) reported transient postoperative faecal incontinence, which resolved after 2 weeks. There appeared to be no difference in outcome between the doses.

CONCLUSIONS

Botulinum toxin injection into the pelvic floor of women with MFPP appears to be beneficial in those who have failed conservative treatment. Prospective studies, including dose-finding studies, are now required.

Exploring Pain-Related Anxiety and Depression in Female Patients With Provoked Vulvodynia With Associated Overactive Pelvic Floor Muscle Dysfunction

Introduction

Vulvodynia is a chronic pain condition with potential associated factors, including musculoskeletal and psychosocial components.

Aim

This study explores the prevalence of pain-related anxiety and depression in women with provoked vestibulodynia with associated overactive pelvic floor muscle dysfunction (PVD-PFD).

Methods

A retrospective chart review of 352 women presenting to 2 urban vulvovaginal specialty clinics over the course of a year was conducted. Women presenting for initial evaluation completed validated questionnaires for pain-related anxiety and depression. Women who completed these questionnaires with a diagnosis of PVD-PFD independently confirmed by a women's health physical therapist were included in analysis. Information on previously attempted treatments was gathered.

Main Outcome Measures

Pain-related anxiety was measured with the Pain Anxiety Symptoms Scale-20 and depression with the Patient Health Questionnaire 8.

Results

Of 79 women with confirmed PVD-PFD, 22% met criteria for pain-related anxiety alone, 4% for depression alone, and 27% for both pain-related anxiety and depression, with a significant association between anxiety and depression (χ² (1) = 21.44, P < .0005, phi = 0.521). There was also a significant association between anxiety and/or depression and whether prior treatment was attempted (χ² (2) = 6.81, P = .03, phi = 0.294).

Conclusion

The study found that 49% of women with PVD-PFD experienced pain-related anxiety, with or without depression. In addition, there was a statistically significant association between attempts at prior treatment and greater pain-related anxiety and depression. This is the first study to report a rate of pain-related anxiety specifically in women with PVD-PFD. These findings are consistent with studies showing elevated pain-related anxiety in other chronic musculoskeletal conditions, including lower back pain and fibromyalgia.

Govind V, Krapf JM, Mitchell L, et al. Exploring Pain-Related Anxiety and Depression in Female Patients With Provoked Vulvodynia With Associated Overactive Pelvic Floor Muscle Dysfunction. J Sex Med 2020;8:517–524.

Vestibular Anatomic Localization of Pain Sensitivity in Women with Insertional Dyspareunia: A Different Approach to Address the Variability of Painful Intercourse

The pathophysiology underlying painful intercourse is challenging due to variability in manifestations of vulvar pain hypersensitivity. This study aimed to address whether the anatomic location of vestibular-provoked pain is associated with specific, possible causes for insertional dyspareunia. Women (n = 113) were assessed for “anterior” and “posterior” provoked vestibular pain based on vestibular tenderness location evoked by a Q-tip test. Pain evoked during vaginal intercourse, pain evoked by deep muscle palpation, and the severity of pelvic floor muscles hypertonicity were assessed. The role of potential confounders (vestibular atrophy, umbilical pain hypersensitivity, hyper-tonus of pelvic floor muscles and presence of a constricting hymenal-ring) was analyzed to define whether distinctive subgroups exist. Q-tip stimulation provoked posterior vestibular tenderness in all participants (6.20 ± 1.9). However, 41 patients also demonstrated anterior vestibular pain hypersensitivity (5.24 ± 1.5). This group (circumferential vestibular tenderness), presented with either vestibular atrophy associated with hormonal contraception use (n = 21), or augmented tactile umbilical-hypersensitivity (n = 20). The posterior-only vestibular tenderness group included either women with a constricting hymenal-ring (n = 37) or with pelvic floor hypertonicity (n = 35). Interestingly, pain evoked during intercourse did not differ between groups. Linear regression analyses revealed augmented coital pain experience, umbilical-hypersensitivity and vestibular atrophy predicted enhanced pain hypersensitivity evoked at the anterior, but not at the posterior vestibule (R = 0.497, p < 0.001). Distinguishing tactile hypersensitivity in anterior and posterior vestibule and recognition of additional nociceptive markers can lead to clinical subgrouping.

Treatment of Vulvodynia: Pharmacological and Non-Pharmacological Approaches

Vulvodynia is a common, recurrent, vulvar pain condition with debilitating consequences for affected women's health and quality of life. The heterogeneity of women suffering from vulvodynia as well as its uncertain and likely multifactorial etiology pose a significant challenge to identifying any kind of "gold standard" treatment. Thus, treatment providers must be well versed in the various options and the evidence for each. In this review, we begin with pharmacological treatments, followed by non-pharmacological treatments, surgery, and finally multimodal treatments. For each approach, we briefly discuss the method, mechanism of action, and empirical support for the treatment. In sum, pharmacological treatments that may be beneficial but require further research include antinociceptive agents (lidocaine, capsaicin), anti-inflammatory agents (corticosteroids, interferon), neuromodulating medications (anticonvulsants and antidepressants), hormonal agents, and muscle relaxants (e.g., botulinum toxin). There is strong evidence to support and recommend non-pharmacological interventions including psychological therapy, pelvic floor physical therapy, as well as surgery (i.e., vestibulectomy for provoked vestibulodynia) for the treatment of vulvodynia. We conclude this review with a discussion of issues that may have hindered progress of treatment efficacy and effectiveness, and recommendations for moving the field forward.

Vulvodynia in adolescents: presentation, diagnosis and treatment options

PURPOSE OF REVIEW

Vulvodynia in adults is a significant source of genital and sexual pain with far reaching negative repercussions. Well designed studies with sufficient power in adults are limited and there are even fewer in adolescents. This review will help the clinician understand, diagnose and treat vulvodynia in adolescents based on current knowledge.

RECENT FINDINGS

Although research on vulvodynia in adolescents is lacking, studies suggest that it not only exists but also may negatively impact an adolescent's medical and sexual health. This review will look at both historical approaches to vulvodynia, as well as more current approaches. It is important to note that no treatment modalities have been specifically approved for use in vulvodynia.

SUMMARY

Vulvodynia in women is known to have significant impact on general health and sexual wellbeing. How early vulvodynia presents is unknown, but it appears that in at least some cases, it can be found in adolescents. Providers of adolescent care should have knowledge of this pain disorder so that they may appropriately diagnose and manage this multifactorial problem.

An automated intravaginal dynamometer: Reliability metrics and the impact of testing protocol on active and passive forces measured from the pelvic floor muscles

AIMS

(1) To determine the reliability of an automated dynamometer designed to assess pelvic floor muscle (PFM) strength and resistance to passive elongation. (2) To evaluate the impact of PFM length and rate of tissue elongation on dynamometric outcomes.

METHODS

At each of two sessions, twenty nulliparous women performed three maximum voluntary contractions (MVC) of their PFMs with the dynamometer set to two different anteroposterior (AP) diameters (25 mm, 35 mm). Next, with PFMs relaxed, the arms of the dynamometer opened three times to 40 mm at two speeds (25 mm/s, 50 mm/s). Outcomes included baseline force, peak force, relative peak force, rate of force development (RFD), stiffness and stress relaxation. Repeated-measures ANOVAs were used to test trial, day, and task effects (α = 0.05), and intra-class correlation coefficients (ICCs) were computed.

RESULTS

Forces measured on MVC were higher with the larger AP diameter, and passive resistance was higher for the faster rate of tissue elongation. The between-trial reliability of all outcomes was excellent (0.82 < ICC < 0.98) for all measures except for peak force during the passive elongation task (0.56 < ICC < 0.93). Between-day reliability was good to excellent for active and passive RFD (0.75 < ICC < 0.93), stiffness (ICC = 0.77) and relative peak force (0.71 < ICC < 0.87); absolute force (0.11 < ICC < 0.85) and stress relaxation responses (0.19 < ICC < 0.98) tended to be less reliable.

CONCLUSIONS

The reliability of the dynamometer is adequate for both clinical and research applications. Relative forces were more reliable than absolute forces. Dimensions and rate of tissue elongation should be controlled and reported with all pelvic floor muscle assessments as these parameters impact outcomes.

Recent advances in understanding provoked vestibulodynia

Vulvodynia refers to pain in the vulva of at least 3 months’ duration in the absence of a recognized underlying cause. Provoked, localized vestibulodynia is the term used to describe superficial pain confined to the vulvar vestibule, provoked by touch. This review will focus on provoked vestibulodynia with regard to its suggested causative factors and will discuss the role of inflammation, vulvovaginal infections, mucosal nerve fiber proliferation, hormonal associations, central pain mechanisms, pelvic floor muscle dysfunction, and genetic factors.

Clinical observations, epidemiological studies, and data from basic research emphasize the heterogeneity of vulvar pain syndromes. There is a critical need to perform prospective, longitudinal studies that will allow better diagnostic criteria and subgrouping of patients that would lead to improvements in our understanding of provoked vestibulodynia and its treatment.