Feasibility of a longitudinal study of women anticipating first pregnancy and assessed by multiple pelvic exams: recruitment and retention challenges

Recruitment and Retention of Urban Pregnant Women to a Clinical Study Administering an Oral Isotope Dietary Tracer

Introduction:

Pregnant women are a vulnerable population that are difficult to engage in clinical research. We report successful recruitment and retention strategies used in a longitudinal pilot study of urban racially/ethnically diverse pregnant women that involved administration of an orally ingested isotope tracer, multiple venipunctures, biopsy of placenta after delivery, and cord or placental blood collection.

Materials and Methods:

We used direct strategies to recruit English-speaking obese and nonobese pregnant women aged 17–45 years, who were in the third trimester of pregnancy. The study required data collection at 32–34 and 34–36 gestational weeks and delivery. Strategies included frequent personal engagement with participants and staff to build relationships and trust, tangible appreciation, and the study team being present at delivery. In addition, leveraging hospital information technology (IT) services was critical to ensure retention through labor and delivery (LD).

Results:

A racially (52% Black, 23% White, and 10% other) and ethnically (15% Hispanic or Latinx) diverse sample of pregnant women was enrolled. Of the 52 women enrolled, 85% of women completed all procedures.

Conclusions:

This is the first report of successful strategies for recruitment and retention of racially/ethnically diverse pregnant women in a longitudinal study requiring oral administration of an isotope tracer. Personal engagement with multiple touch points, starting with recruitment and continuing regularly throughout the third trimester, was the most successful strategy. Creating and maintaining relationships with the LD providers and staff and utilizing hospital IT, including targeted electronic medical record alerts, ensured successful retention for the duration of the study.

Trial Registration:

Not applicable.

Longitudinal Study of Pelvic Floor Characteristics Before, During, and After Pregnancy in Nulliparous Women

OBJECTIVES

To investigate the changes in the pelvic floor before, during, and after pregnancy in the same collective of nulliparous women.

METHODS

In a prospective observational pilot study between April 2015 and June 2019 in nulliparous women with planned pregnancy, we used the pelvic organ prolapse quantification (POP-Q) system; a 2-dimensional (2D) sonography to investigate the bladder neck, cervix, and anorectal junction positions; and a 3D/4D sonography to measure the hiatus of the levator ani muscle (LH area) during Valsalva maneuver. Five visits were planned: 1 before, 3 during, and 1 visit after pregnancy.

RESULTS

Twenty-four women participated in the study. We achieved a minimum of 2 visit measurements from 10 women who became pregnant. The LH area decreased during the first trimester and then increased until the third trimester. Postpartum, the LH area reached the prepregnancy state. We observed changes in the bladder neck mobility, bladder neck position, cervix, and anorectal junction from the first trimester. Postpartum, the bladder neck mobility was higher, and the position of the bladder neck and anorectal junction was lower than before pregnancy. We observed no remarkable changes in the POP-Q state during pregnancy.

CONCLUSION

This was the first study to investigate pelvic floor characteristics in the same collective before, during, and after pregnancy. We observed pelvic floor changes from the prepregnancy state to the first trimester to postpartum. The study results need to be confirmed in a larger study.

The Food, Feelings, and Family Study: comparison of the efficacy of traditional methods, social media, and broadcast email to recruit pregnant women to an observational, longitudinal nutrition study

Background

It is well known that recruitment is a challenging aspect of any study involving human subjects. This challenge is exacerbated when the population sought is reticent to participate in research as is the case with pregnant women and individuals with depression. This paper compares recruitment methods used for the Food, Feelings, and Family Study, an observational, longitudinal pilot study concerning how diet and bisphenol A exposure affect maternal mood and cognitive function during and after pregnancy.

Methods

Pregnant women were recruited to this study over a period of 15 months using traditional methods, social media including paid and unpaid posts, and emails broadcast to the university community. Contingency analysis using the Pearson’s Chi-square test was used to determine if recruitment method was associated with likelihood of participation. T-tests were used to analyze Facebook advertisement success. ANOVAs and Fisher exact tests were used to determine if recruitment method was related to continuous and categorical demographics, respectively.

Results

Social media resulted in the largest number of recruits, followed by traditional methods and broadcast email. Women recruited through social media were less likely to participate. In contrast, use of broadcast email resulted in a smaller pool of recruits but these recruits were more likely to be eligible for and complete the study. Most women recruited via social media were the result of unpaid posts to the study’s Facebook page. Paid posts lasting at least 4 days were the most successful. Recruitment method was not associated with participant demographics.

Conclusions

Social media has the potential to recruit a large pool of potential subjects; however, when studies require a large time investment such as the case here, women recruited through social media are less likely to participate and complete the study than women recruited through other means.

Trial registration

N/A. This study does not describe a health care intervention.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12884-021-03680-1.

Retention strategies in longitudinal cohort studies: a systematic review and meta-analysis

BACKGROUND

Participant retention strategies that minimise attrition in longitudinal cohort studies have evolved considerably in recent years. This study aimed to assess, via systematic review and meta-analysis, the effectiveness of both traditional strategies and contemporary innovations for retention adopted by longitudinal cohort studies in the past decade.

METHODS

Health research databases were searched for retention strategies used within longitudinal cohort studies published in the 10-years prior, with 143 eligible longitudinal cohort studies identified (141 articles; sample size range: 30 to 61,895). Details on retention strategies and rates, research designs, and participant demographics were extracted. Meta-analyses of retained proportions were performed to examine the association between cohort retention rate and individual and thematically grouped retention strategies.

RESULTS

Results identified 95 retention strategies, broadly classed as either: barrier-reduction, community-building, follow-up/reminder, or tracing strategies. Forty-four of these strategies had not been identified in previous reviews. Meta-regressions indicated that studies using barrier-reduction strategies retained 10% more of their sample (95%CI [0.13 to 1.08]; p = .01); however, studies using follow-up/reminder strategies lost an additional 10% of their sample (95%CI [- 1.19 to - 0.21]; p = .02). The overall number of strategies employed was not associated with retention.

CONCLUSIONS

Employing a larger number of retention strategies may not be associated with improved retention in longitudinal cohort studies, contrary to earlier narrative reviews. Results suggest that strategies that aim to reduce participant burden (e.g., flexibility in data collection methods) might be most effective in maximising cohort retention.

Facilitators and barriers to pregnant women's participation in research: A systematic review

BACKGROUND

Although there is consensus among many that exclusion of pregnant women from clinical research should be justified, there is uncertainty as to whether and why pregnant women themselves would be willing to participate even if they were found to be eligible. The objective was to identify the reasons why pregnant women participate in clinical research and thereby to distinguish between facilitators and barriers.

METHODS

We conducted a systematic review of articles regarding pregnant women's reasons for participation in clinical research. We used the PubMed/MEDLINE, EMBASE, PsycINFO and CINAHL databases and retrieved additional articles through manually searching the reference lists. We included all articles that reported on pregnant women's reasons for participation in clinical research. We accumulated all reasons that were mentioned in the total of articles and collated them to themes, classifying these themes as a facilitator or a barrier.

RESULTS

The search identified thirty articles that met the inclusion criteria. Themes classified as facilitators: aspirational benefits, collateral benefits, direct benefits, third party influence and lack of inconvenience. Themes classified as barriers: inconveniences, risks, randomisation, lack of trust in research enterprise, medical reasons and third party influence.

CONCLUSIONS

Pregnant women report mostly altruistic and personal reasons for their willingness to participate in clinical research, while barriers primarily relate to inconveniences. It appears that pregnant women's described reasoning is similar to the described reasoning of non-pregnant research subjects. Enhancing the facilitators and overcoming the barriers is the next step to increase the evidence-base underlying maternal and foetal health.

Pregnancy and parturition negatively impact vaginal angle and alter expression of vaginal MMP-9

BACKGROUND

Parity is the greatest risk factor for the development of pelvic organ prolapse. The normally supported vagina is pulled up and back over the levator ani. Loss of vaginal angulation has been associated with prolapse and may represent injury to the vaginal supportive tissues.

OBJECTIVE

We proposed and examined the following hypotheses: (1) pregnancy and delivery impact vaginal support, leading to loss of vaginal angle; (2) vaginal angulation is restored postpartum; and (3) uncomplicated vaginal delivery (VD) is associated with accelerated remodeling of the vaginal fibrillar matrix.

MATERIALS AND METHODS

We prospectively enrolled a cohort of nulliparas in the first trimester of pregnancy, and abstracted demographic and delivery data. Metalloproteinase 9 (MMP-9) activity in the vagina was determined in the first and third trimesters and 1 year postpartum using a substrate activity assay. Uncomplicated VD was defined as none of the following: cesarean delivery, forceps or vacuum use, shoulder dystocia, obstetric anal sphincter laceration, or prolonged second-stage labor. Women were grouped dichotomously for comparison based on this definition. A subset of participants underwent transperineal ultrasound.

RESULTS

We enrolled 173 women with mean age of 25 ± 6 years and a body mass index of 20 ± 7 kg/m². Of the women, 67% identified as white/Caucasian, 27% black/African American, or 6% Hispanic/Latina. The mean delivery age was 39 ± 3 weeks, with 59% of participants experiencing uncomplicated VD. The MMP-9 median activity (ng/mg protein) was 242.0 (IQR, 18.7, 896.8; n = 157) in the first trimester, 130.8 (IQR, 14.6, 883.8; n = 148) in the third trimester, and 463.5 (IQR, 92.2, 900.0; n = 94) postpartum. The MMP-9 activity increased between the third trimester and 1 year postpartum (P = .006), with no significant difference between MMP-9 values in the first and third trimesters (P = .674). The vaginal angle became less acute from the first to the third trimester, and this change persisted postpartum. The vaginal angulation over the levator plate became more acute between the third trimester and postpartum in women who experienced uncomplicated VD compared to those who did not (-6.4 ± 22.1 degrees vs 17.5 ± 14.8 degrees; P = .017). Higher MMP-9 activity postpartum was associated with uncomplicated VD, with 67% of women in the third tertile achieving uncomplicated VD versus 39% in the first tertile (P = .029).

CONCLUSION

Loss of vaginal angulation occurs between trimesters, and women do not recover their baseline resting angle postpartum. MMP-9 activity increases postpartum. Women experiencing uncomplicated VD demonstrate higher postpartum MMP-9 activity and are more likely to have recovered their vaginal angle.

Windows of Opportunity for Lifestyle Interventions to Prevent Gestational Diabetes Mellitus

Gestational diabetes mellitus (GDM) is linked with several acute maternal health risks and long-term development of type 2 diabetes, metabolic syndrome, and cardiovascular disease. Intrauterine exposure to GDM similarly increases offspring risk of early-life health complications and later disease. GDM recurrence is common, affecting 40 to 73% of women, and augments associated maternal/fetal/child health risks. Modifiable and independent risk factors for GDM include maternal excessive gestational weight gain and prepregnancy overweight and obesity. Lifestyle interventions that target diet, activity, and behavioral strategies can effectively modify body weight. Randomized clinical trials testing the effects of lifestyle interventions during pregnancy to reduce excessive gestational weight gain have generally shown mixed effects on reducing GDM incidence. Trials testing the effects of postpartum lifestyle interventions among women with a history of GDM have shown reduced incidence of diabetes and improved cardiovascular disease risk factors. However, the long-term effects of interpregnancy or prepregnancy lifestyle interventions on subsequent GDM remain unknown. Future adequately powered and well-controlled clinical trials are needed to determine the effects of lifestyle interventions to prevent GDM and identify pathways to effectively reach reproductive-aged women across all levels of society, before, during, and after pregnancy.

Recruitment for longitudinal, randomised pregnancy trials initiated preconception: lessons from the effects of aspirin in gestation and reproduction trial

BACKGROUND

Recruitment into large, preconception randomised clinical trials (RCT) is challenging. We describe clinic and community-based preconception recruitment strategies for the Effects of Aspirin in Gestation and Reproduction (EAGeR) trial and highlight approaches that were and were not successful. This longitudinal RCT was conducted at four major sites in the US. Eligible women had one to two prior pregnancy losses and were actively trying to become pregnant.

METHODS

Provider/clinic and community-based outreach strategies were utilised, and the recruitment rate and costs of methods were assessed.

RESULTS

A screening questionnaire was completed by 5485 women; 42.4% (n = 2323) screened were initially eligible, of whom 50.7% (n = 1228) were randomised. Provider/clinic-based recruitment yielded the highest number eligible of those screened (30.1%) and also the most randomised participants overall (40.3%). The next highest yield came from direct mail and brochures/flyers at 13.1% and 12.5% of women randomised, respectively. However, direct mailings cost $720 per participant randomised. Other than word of mouth, provider/clinic-based recruitment was the most cost effective method, costing an average of $60 per randomised participant. Web-based recruitment yielded 4.7% of participants at a cost of $278 per randomised participant.

CONCLUSIONS

Provider and clinic-based recruitment was the most effective and cost-efficient method of recruitment in a preconception intervention study of reproduction among women.

Maternal adaptations in preparation for parturition predict uncomplicated spontaneous delivery outcome

OBJECTIVE

The objective of the study was to define maternal tissue adaptations in pregnancy associated with uncomplicated spontaneous vaginal delivery using anatomical and biological outcomes.

STUDY DESIGN

Nulliparous gravidas were prospectively enrolled in the first trimester at 2 institutions. Demographic and delivery data were chart abstracted. Vaginal elastase activity (units per milligram of protein) and Pelvic Organ Prolapse Quantification measurements of pelvic organ support were obtained in the first and third trimesters. A subset underwent 3-dimensional ultrasound measures of levator hiatus. Uncomplicated spontaneous vaginal delivery (VD) was defined as no cesarean, forceps, vacuum, shoulder dystocia, third- or fourth-degree perineal laceration, or prolonged second stage labor.

RESULTS

We enrolled 173 women in their first trimester, 50 of whom had ultrasounds. Mean age was 25.5 ± 5.5 years with a body mass index of 28.0 ± 7.3 kg/m(2). Sixty-seven percent were white/Caucasian, 27% black/African American, and 6% Hispanic/Latina. Mean delivery gestational age was 38.5 ± 2.9 weeks, with 23% delivering by cesarean and 59% achieving uncomplicated spontaneous VD. Vaginal support changed significantly over trimesters with posterior vaginal and hiatal relaxation, vaginal lengthening, and increased levator hiatus area during strain. Women achieving uncomplicated spontaneous VD demonstrated significantly greater relaxation on third-trimester Pelvic Organ Prolapse Quantification for anterior, apical, and hiatal measures than those without uncomplicated spontaneous VD. Higher first-trimester vaginal elastase activity was strongly associated with uncomplicated spontaneous VD (geometric mean activity 0.289 ± 0.830 U/mg vs -0.029 ± 0.585 U/mg, P = .009). Higher first-trimester elastase, younger age, lower first-trimester body mass index, and more third-trimester vaginal support laxity in points C and GH were predictive of VD success.

CONCLUSION

Significant maternal adaptations occur in the vagina during pregnancy, presumably in preparation for vaginal delivery. Greater adaptation, including vaginal descent and higher first-trimester elastase activity, is associated with an increased likelihood of uncomplicated spontaneous VD.

Challenges in cardiology research in pregnancy

ABSTRACT 

Research in pregnancy is challenging as it involves a special ‘vulnerable’ group due to the involvement of the mother and the fetus. These challenges, which are inherent in studying pregnancy in physiologic and pathologic states, have contributed to the scant research in pregnancy. Until recently, most studies in pregnancy were nonrandomized and retrospective in nature, representing prevailing clinical standards of practice and clinicians’ biases. Prospective studies were generally limited to single centers, comprising of small sample sizes and were observational in nature, rather than randomized studies involving therapy. Ethical and legal factors, research mandates, patient factors, the protracted nature of pregnancy, institutional commitment to research, interdisciplinary clinical and research collaboration, funding support, administrative issues and the level of involvement of national cardiac and obstetric and gynecological societies have been barriers to research in pregnancy in developed countries. Even prospective observational studies are difficult to perform due the difficulties involved with obtaining consent, study recruitment and follow-up. Misconceptions regarding research have led to a lack of participation by women. The longitudinal nature of prospective studies in pregnancy, the problems associated with enrolling women before pregnancy and in the first trimester and the failure to understand the commitment required by the patient, as well as many social factors, have led to increased drop-out rates during pregnancy, as well as difficulty with follow-up in the post-partum state. These factors, along with the failure to supplement funding support due to longer study periods than anticipated, have led to studies of small sample sizes. Understanding patient factors that lead to a lack of participation in research or dropping out following initial consent could help make research participation more conducive for pregnant women. The involvement of national societies in the planning and funding of multicenter studies, interdepartmental and interinstitutional collaboration, institutional and extramural funding support and patient incentives are crucial for shortening study duration and ensuring adequacy of sample sizes for successful research in pregnancy. National health service structures, such as those found in Europe and Canada, makes multicenter collaboration for prospective studies more feasible than for countries such as the USA, in which the fees-for-service system is used. Utilization of telemedicine and handheld ultrasound systems and participation in prospective multicenter registries could not only improve the clinical care of pregnant women in underdeveloped countries, but also provide a platform for research during pregnancy. Multicenter and even global registries supported by European cardiac societies have been formed recently that are beginning to bring forth much-needed data regarding pathological states, such as peripartum cardiomyopathy and pregnancy in congenital heart disease. Such studies are largely confined to non-US countries and have started seeing participation from underdeveloped countries. Studies on pregnancy in connective tissue disorders, older women, post-chemoradiation therapy or organ transplantation and in the HIV state remain limited.

Recruitment of pregnant women in research

The aim was to identify factors that could influence recruitment in a prospective longitudinal study involving pregnant women. A total of 269 nulliparous women were enrolled for a prospective longitudinal study, to establish the prevalence of levator ani muscle defects during childbirth. The project was explained verbally and potential participants were given an information leaflet. When eligible and interested, they provided their contact details to enquire if they were willing to participate. Out of the 1,473 women approached, 269 (18.3%) agreed to participate and 1,043 (70.8%) declined; 420 women (40.3%) did not provide a reason for non-participation (see text for further details). Most often mentioned reasons were 'being too busy', 'other pregnancy problems', 'no additional (internal) examination', 'moving (abroad)' and 'husband'. Women from different ethnicities and age groups gave a wide variety of reasons for non-participation. This information can now be used by researchers recruiting women for comparable studies, to enhance recruitment and participation of eligible patients.

Cohorts and community: a case study of community engagement in the establishment of a health and demographic surveillance site in Malaysia

BACKGROUND

Community engagement is an increasingly important requirement of public health research and plays an important role in the informed consent and recruitment process. However, there is very little guidance about how it should be done, the indicators for assessing effectiveness of the community engagement process and the impact it has on recruitment, retention, and ultimately on the quality of the data collected as part of longitudinal cohort studies.

METHODS

An instrumental case study approach, with data from field notes, policy documents, unstructured interviews, and focus group discussions with key community stakeholders and informants, was used to explore systematically the implementation and outcomes of the community engagement strategy for recruitment of an entire community into a demographic and health surveillance site in Malaysia.

RESULTS

For a dynamic cohort, community engagement needs to be an ongoing process. The community engagement process has likely helped to facilitate the current response rate of 85% in the research communities. The case study highlights the importance of systematic documentation of the community engagement process to ensure an understanding of the effects of the research on recruitment and the community.

CONCLUSIONS

A critical lesson from the case study data is the importance of relationships in the recruitment process for large population-based studies, and the need for ongoing documentation and analysis of the impact of cumulative interactions between research and community engagement.

Effect of childbirth on pelvic organ support and quality of life: a longitudinal cohort study

INTRODUCTION AND HYPOTHESIS

Although childbirth is known to be a major risk factor for pelvic floor disorders, there is a paucity of prospective, long-term data addressing this issue. The aim of our study was to evaluate the changes of pelvic organ support, symptoms and quality of life (QOL) after childbirth.

METHODS

Pelvic organ support was objectively assessed using the Pelvic Organ Prolapse Quantification method (POP-Q) and pelvic floor symptoms were subjectively evaluated using a validated questionnaire performed in the second trimester, 14 weeks, 1 and 5 years after delivery.

RESULTS

We recruited 182 nulliparae and 97 (53.3 %) returned for follow-up at 5 years. POP-Q stage after vaginal delivery (VD) worsened at all time points. After caesarean the worsening in POP-Q stage was temporary at 14 weeks. Prolapse symptoms worsened at 14 weeks (p<0.001) and 1 year (p=0.006) after VD but not at 5 years. No changes in prolapse symptoms occurred after caesarean. Significant increase in faecal incontinence was observed in both delivery groups 5 years after delivery. For all pelvic floor disorder domains there were no significant changes in QOL irrespective of mode of delivery, except for worsening in general sexual QOL after VD.

CONCLUSIONS

Five years after childbirth the stage of prolapse worsened after VD but not after caesarean. However, there was no impact on prolapse symptoms or QOL. After VD women were more likely to experience a worsening in general sex score, but no other difference in QOL measures.