Outcomes and outcomes measurements used in intervention studies of pelvic girdle pain and lumbopelvic pain: a systematic review

Validation of the Patient-Reported Outcomes Measurement Information System Pain Intensity and Brief Pain Inventory During Pregnancy

OBJECTIVES

We sought to (1) validate the Patient-Reported Outcomes Measurement Information System (PROMIS) Pain Intensity Short Form 3a measure and Brief Pain Inventory (BPI) for assessing pain during pregnancy and (2) evaluate pain in a sample of pregnant individuals.

METHODS

Pregnant individuals (N = 196) were prospectively surveyed: n = 171 up to 22 weeks gestational age, n = 123 during their third trimester of pregnancy, and n = 98 both times. Additional measures included SPRINT Post-Traumatic Stress Disorder Tool, Neurological Quality of Life, Edinburgh Postnatal Depression Scale and anxiety subscale, and Adverse Childhood Experiences Questionnaire. Validity evidence examined included content validity, reliability, convergent and discriminant validity, and relevant criterion relationships.

RESULTS

Content validity analysis suggests that the PROMIS pain measure was easy to use and interpret while the BPI provided more detail. However, BPI questions regarding medication usage and relief were unclear to some pregnant individuals. In addition, the relationships among pain ratings were stronger than relationships between pain ratings and measures intended to assess other constructs suggesting convergent and discriminant validity. Relationships with relevant criterions were presented for both the PROMIS and BPI by comparing ratings of pain intensity and severity for pregnant individuals with and without areas of pain reported on BPI.

CONCLUSION

Results indicate that PROMIS and BPI provided valid information on pain intensity or severity for our perinatal sample. Depending on the research question, the PROMIS pain or BPI may be more appropriate to an individual study. Either measure could also be included in an electronic health record for accurate pain assessment in clinical settings.

Predictive Factors for Pregnancy-Related Persistent Pelvic Girdle Pain (PPGP): A Systematic Review

Background and Objectives: To identify the most frequently reported predictive factors for the persistency of pregnancy-related pelvic girdle pain (PPGP) at 3-6 months after childbirth in women with PPGP alone or PPGP in association with pregnancy-related lower back pain (PLBP). Methods: Eligibility criteria: Two authors independently selected studies excluding PPGP determined by a specific, traumatic, gynecological/urological cause or isolated PLBP and studies that did not include the presence/absence of PPGP as the the primary outcome. We, instead, included studies with an initial assessment in pregnancy (within 1 month of delivery) and with a follow-up of at least 3 months after delivery. Data sources: The research was performed using the databases of Medline, Cochrane, Pedro, Scopus, Web of Science and Cinahl from December 2018 to January 2022, following the indications of the PRISMA statement 2021 and the MOOSE checklist. It includes observational cohort studies in which data were often collected through prospective questionnaires (all in English). Study appraisal and risk of bias: Two independent authors performed evaluations of the risk of bias (ROB) using the quality in prognostic studies (QUIPS) tool. Synthesis of results: An in-depth qualitative analysis was conducted because, due to a high degree of heterogeneity in the data collection of the included studies and a lack of raw data suitable for quantitative analysis, it was not possible to carry out the originally planned meta-analyses for the subgroups. Results: The research process led to the inclusion of 10 articles which were evaluated using the QUIPS tool: 5 studies were evaluated as low ROB and 5 were evaluated as moderate ROB. High levels of pain in pregnancy, a large number of positive provocation tests, a history of lower back pain and lumbo-pelvic pain, high levels of disability in pregnancy, neurotic behavior and high levels of fear-avoidance belief were identified as strong predictors of long-term PPGP, while there was weak or contradictory evidence regarding predictions of emotional distress, catastrophizing and sleep disturbances. Discussion: The impossibility of carrying out the meta-analysis by subgroups suggests the need for further research with greater methodological rigor in the acquisition of measures based on an already existing PPGP core predictors/outcome sets.

Herbal Medicine for Postpartum Pain: A Systematic Review of Puerperal Wind Syndrome (Sanhupung)

Mothers in the postpartum period often experience musculoskeletal disorders and pain, impacting their ability to care for themselves and their infants. Conventional treatments have limitations, prompting interest in alternative options like herbal medicine. This systematic review aimed to confirm the effectiveness and safety of herbal medicine treatment to improve maternal health in patients with postpartum pain (puerperal wind syndrome). We searched eight electronic databases for randomized controlled trials (RCTs) to evaluate the effects of herbal medicines on puerperal wind syndrome. Nine RCTs, including 652 patients, were selected. Following a meta-analysis of RCTs, both herbal medicine and combination treatments improved the visual analog scale scores, total effective rate, scores of Traditional Chinese Medicine syndromes, Oswestry Disability Index, and quality of life in patients with role-emotional puerperal wind syndrome. All adverse events were minor, and the incidence rate was not high compared with that of the control group. In conclusion, herbal medicine supports the improvement in pain, other systemic symptoms, and the quality of life of patients with puerperal wind syndrome. Moreover, no serious side effects were observed; therefore, herbal medicines appear to be safe. It can be the preferred treatment option for puerperal wind syndrome, which is currently managed symptomatically.

Factors in early pregnancy predicting pregnancy-related pain in the second and third trimester

INTRODUCTION

Pain during pregnancy affects women's well-being, causes worry and is a risk factor for the child and the mother during labor. The aim was to investigate the relative importance of an extensive set of pregnancy-related physiological symptoms and psychosocial factors assessed in the first trimester compared with the occurrence of pregnancy-related pain symptoms later in the pregnancy.

MATERIAL AND METHODS

Included were all women who booked an appointment for a first prenatal visit in one of 125 randomly selected general practitioner practices in Eastern Denmark from April 2015 to August 2016. These women answered an electronic questionnaire containing questions on the occurrence of five pregnancy-related pain symptoms: back pain, leg cramps, pelvic cavity pain, pelvic girdle pain and uterine contractions. The questionnaire also included sociodemographic questions and questions on chronic diseases, physical symptoms, mental health symptoms, lifestyle and reproductive background. The questionnaire was repeated in each trimester. The relative importance of this set of factors from the first trimester on the five pregnancy-related pain symptoms compared with the second and third trimesters was assessed in a dominance analysis.

RESULTS

A total of 1491 women were included. The most important factor for pregnancy-related pain in the second trimester and third trimester is the presence of the corresponding pain in the first trimester. Parity was associated with pelvic cavity pain and uterine contractions in the following pregnancies. For back pain and pelvic cavity pain, the odds increased as the women's estimated low self-assessed fitness decreased and had low WHO-5 wellbeing scores.

CONCLUSIONS

When including physical risk factors, sociodemographic factors, psychological factors and clinical risk factors, women's experiences of pregnancy-related pain in the first trimester are the most important predictors for pain later in pregnancy. Beyond the expected positive effects of pregnancy-related pain, notably self-assessed fitness, age and parity were predictive for pain later in pregnancy.

Outcome Measurement Instruments and Evidence-based Recommendations for Measurement of the Pelvic Girdle Pain Core Outcome Set (PGP-COS): A Systematic Review and Consensus Process

This study provides evidence- and consensus-based recommendations for the instruments to measure the five Pelvic Girdle Pain Core Outcome Set (PGP-COS): pain frequency, pain intensity/severity, function/disability/activity limitation, health-related quality of life and fear avoidance. Studies evaluating measurement properties of instruments measuring any PGP-COS outcome in women with PGP were identified through a systematic search of MEDLINE, EMBASE and PEDro databases (inception-July 2021). The methodological quality of studies and quality of measurement properties were evaluated using the COnsensus-based Standards for the selection of health status Measurement Instruments (COSMIN) checklist. Quality criteria and the synthesized evidence were graded using the modified grading of recommendations, assessment, development, and evaluation (GRADE) approach. A consensus meeting with PGP stakeholders was then held to establish recommendations, based on the evidence, for the instruments that should be used to measure the PGP-COS. Ten instruments were identified from 17 studies. No instrument showed high quality evidence for all measurement properties and/or measured all PGP-COS outcomes. Based on current evidence and consensus, the Pelvic Girdle Questionnaire (PGQ), the Short Form-8 (SF-8) and the Fear Avoidance Beliefs Questionnaire (FABQ) are recommended for measuring the PGP-COS. Future research should establish additional measurement properties of instruments and to substantiate these recommendations.

Effects of a New Mattress and Pillow and Standard Treatment for Nightly Pelvic Girdle Pain in Pregnant Women: A Randomised Controlled Study

Objective

To evaluate the efficacy of a memory-foam mattress and pillow plus standard treatment for nightly pelvic girdle pain (PGP) during pregnancy.

Method

In this randomised controlled study conducted at a tertiary-care hospital, 66 pregnant women who had nightly PGP were enrolled to receive standard treatment with the mattress and pillow (intervention group, n = 34) or solely standard treatment (control group, n = 32). The primary outcome was change in nightly posterior PGP on a visual analogue scale, VAS from baseline to 4 weeks. Secondary outcomes include nightly anterior PGP, the evening PGP score, estimated sleep duration, number of nightly wake-ups, daytime sleepiness (Epworth sleepiness scale), function (Pelvic Girdle Questionnaire), health-related quality of life, and pain catastrophizing.

Results

Forty-four women (67%) completed the treatment. The difference in nightly posterior pain intensity was significantly different in favour of the intervention group (VAS, 16.5 mm (95% CI 1.4:31.6) p = 0.028). Sleep duration increased within both groups (intervention group: 26 min, p = 0.022; control group: 14 min, p = 0.014) and the difference between groups was significant (p = 0.046). In addition, the intervention group indicated a decreased evening PGP intensity (p = 0.008) and fewer nightly wake-ups (p = 0.049). The control group showed a deterioration in function (Pelvic Girdle Questionnaire) (p = 0.018) and an increase in daytime sleepiness (Epworth sleepiness scale) (p = 0.021) from baseline to 4 weeks.

Conclusion

In conclusion, significantly lower nightly posterior PGP intensity was noted after the use of a mattress and pillow as an adjunct to standard treatment. Nightly PGP can have adverse effects on various aspects of the health and quality of life of pregnant women, and although the results of this study should be interpreted with caution considering the high drop-out rate and the inadequate statistical power, the findings indicate the potential for the use of such interventions to improve PGP in pregnant women.

A core outcome set for research and clinical practice in women with pelvic girdle pain: PGP-COS

Background

Inconsistent reporting of outcomes in clinical trials of women with Pelvic Girdle Pain (PGP) hinders comparison of findings and the reliability of evidence synthesis. A core outcome set (COS) can address this issue as it defines a minimum set of outcomes that should be reported in all clinical trials on the condition. The aim of this study was to develop a consensus-based COS for evaluating the effectiveness of interventions in PGP during pregnancy and postpartum for use in research and clinical practice.

Methods

A systematic review of previous studies on PGP and semi-structured interviews with women were undertaken to identify all outcomes that were reported in prior studies and that are relevant to those experiencing the condition. Key stakeholders (clinicians, researchers, service providers/policy makers and individuals with PGP) then rated the importance of these outcomes for including in a preliminary PGP-COS using a 3-round Delphi study. The final COS was agreed at a face-to-face consensus meeting.

Results

Consensus was achieved on five outcomes for inclusion in the final PGP-COS. All outcomes are grouped under the “life impact” domain and include: pain frequency, pain intensity/severity, function/disability/activity limitation, health-related quality of life and fear avoidance.

Conclusion

This study identified a COS for evaluating the effectiveness of interventions in pregnancy-related and postpartum-related PGP in research and clinical settings. It is advocated that all trials, other non-randomised studies and clinicians in this area use this COS by reporting these outcomes as a minimum. This will ensure the reporting of meaningful outcomes and will enable the findings of future studies to be compared and combined. Future work will determine how to measure the outcomes of the PGP-COS.

Core outcome set registration

This PGP-COS was registered with COMET (Core Outcome Measures for Effectiveness Trials) in January 2017 (http://www.comet-initiative.org/studies/details/958).

Methodology in core outcome set (COS) development: the impact of patient interviews and using a 5-point versus a 9-point Delphi rating scale on core outcome selection in a COS development study

BACKGROUND

As the development of core outcome sets (COS) increases, guidance for developing and reporting high-quality COS continues to evolve; however, a number of methodological uncertainties still remain. The objectives of this study were: (1) to explore the impact of including patient interviews in developing a COS, (2) to examine the impact of using a 5-point versus a 9-point rating scale during Delphi consensus methods on outcome selection and (3) to inform and contribute to COS development methodology by advancing the evidence base on COS development techniques.

METHODS

Semi-structured patient interviews and a nested randomised controlled parallel group trial as part of the Pelvic Girdle Pain Core Outcome Set project (PGP-COS). Patient interviews, as an adjunct to a systematic review of outcomes reported in previous studies, were undertaken to identify preliminary outcomes for including in a Delphi consensus survey. In the Delphi survey, participants were randomised (1:1) to a 5-point or 9-point rating scale for rating the importance of the list of preliminary outcomes.

RESULTS

Four of the eight patient interview derived outcomes were included in the preliminary COS, however, none of these outcomes were included in the final PGP-COS. The 5-point rating scale resulted in twice as many outcomes reaching consensus after the 3-round Delphi survey compared to the 9-point scale. Consensus on all five outcomes included in the final PGP-COS was achieved by participants allocated the 5-point rating scale, whereas consensus on four of these was achieved by those using the 9-point scale.

CONCLUSIONS

Using patient interviews to identify preliminary outcomes as an adjunct to conducting a systematic review of outcomes measured in the literature did not appear to influence outcome selection in developing the COS in this study. The use of different rating scales in a Delphi survey, however, did appear to impact on outcome selection. The 5-point scale demonstrated greater congruency than the 9-point scale with the outcomes included in the final PGP-COS. Future research to substantiate our findings and to explore the impact of other rating scales on outcome selection during COS development, however, is warranted.

Pelvic Girdle Pain, Hypermobility Spectrum Disorder and Hypermobility-Type Ehlers-Danlos Syndrome: A Narrative Literature Review

Pelvic girdle pain (PGP) refers specifically to musculoskeletal pain localised to the pelvic ring and can be present at its anterior and/or posterior aspects. Causes such as trauma, infection and pregnancy have been well-established, while patients with hypermobile joints are at greater risk of developing PGP. Research exploring this association is limited and of varying quality. In the present study we report on the incidence, pathophysiology, diagnostic and treatment modalities for PGP in patients suffering from Hypermobility Spectrum Disorder (HSD) and Hypermobility-Type Ehlers-Danlos Syndrome (hEDS). Recommendations are made for clinical practice by elaborating on screening, diagnosis and management of such patients to provide a holistic approach to their care. It appears that this cohort of patients are at greater risk particularly of mental health issues. Moreover over, they may require a multidisciplinary approach for their management. Ongoing research is still required to expand our understanding of the relationship between PGP, HSD and hEDS by appropriately diagnosing patients using the latest updated terminologies and by conducting randomised control trials to compare outcomes of interventions using standardised patient reported outcome measures.