Delivery mode is a major environmental determinant of stress urinary incontinence: results of the Evanston-Northwestern Twin Sisters Study

The female urethra: urethral function throughout a woman's lifetime

INTRODUCTION AND HYPOTHESIS

The objective of this narrative review is to describe changes in urethral function that occur during a woman's lifetime. Evaluation of urethral function includes measurements of urethral closure pressure, at rest and during stress, leak point pressure, and the detailed study of anatomical and histological changes of the urethral sphincteric mechanism.

METHODS

A literature search in MEDLINE, PubMed, and relevant journals from 1960 until 2020 was performed for articles dealing with urethral function and the impact of aging, pregnancy, and childbirth, female hormones, and menopausal transition on the urethral sphincteric mechanism. Longitudinal and cross-sectional epidemiological surveys, studies on histological changes in urethral anatomy during aging, and urodynamic data obtained at different points in a woman's lifetime, during pregnancy, after childbirth, as well as the effects of female hormones on urethral sphincter function are reviewed. Relevant studies presenting objective data are analyzed and briefly summarized.

RESULTS AND CONCLUSIONS

The findings lead one to conclude that a constitutional or genetic predisposition, aging, and senescence are the most prominent etiological factors in the development of urinary incontinence and other pelvic floor disorders. Vaginal childbirth dilates and may damage the compressed pelvic supportive tissues and is invariably associated with a decline in urethral sphincter function. Pregnancy, hormonal alterations, menopausal transition, weight gain, and obesity are at best of secondary influence on the pathology of lower urinary tract dysfunction. The decline of circulating estrogens during menopausal transition may play a role in the transition of fibroblasts to cellular senescence.

Sexually Induced Orgasm to Improve Postpartum Pelvic Floor Muscle Strength and Sexual Function in Primiparous Women After Vaginal Delivery: A Prospective Randomized Two-Arm Study

BACKGROUND

Postpartum pelvic floor dysfunction is known to affect the quality of life of women and the methods to treat it are more complex with majority requiring training under supervision.

AIM

To compare the efficacy of sexually induced orgasm along with Kegels exercises versus Kegels exercises alone as a treatment method to enhance postpartum pelvic floor muscle strength and sexual function in primiparous women undergoing uncomplicated vaginal deliveries.

METHODS

The prospective randomized two-arm study was conducted on sexually active primiparous women who had undergone uncomplicated vaginal deliveries. Those with risk factors for female sexual dysfunction and pelvic floor muscle dysfunction were excluded. Participants in Group 1 were advised daily Kegel's exercises, whereas, those in Group 2 were advised to initiate self-initiated/partnered sexual activity-induced orgasms along with daily Kegel's exercises. Their pelvic floor muscle strength on voluntary contraction, ability to relax pelvic floor voluntarily, and sexual function (using FSFI-6) were assessed monthly for 6 months and the analysis was done using G* Power software (© 2021 Heinrich-Heine-Universität Düsseldorf, Germany).

MAIN OUTCOME MEASURE

Postpartum pelvic floor strength and sexual function in 2 groups of women under study.

RESULTS

The study period was from January 2020 to December 2020. The Group 1 had 26 participants (mean age 29.69 ± 2.2 years) and Group 2 had 29 participants (mean age 30.07 ± 2.57 years). The sexual function as well as ability to relax pelvic floor were significantly better in Group 2 compared to Group 1 at each monthly intervals whereas strength of pelvic floor muscles during voluntary contraction was significantly higher in Group 2 compared to Group 1 at the end of 6 months and it was statistically significant at a P value of .05.

CLINICAL IMPLICATIONS

Novel method of using naturally occurring sexually induced orgasms for postpartum pelvic floor rehabilitation can revolutionize postpartum pelvic floor training in women, as it can be practiced at home with ease, along with easily performable Kegel's exercises.

STRENGTHS AND LIMITATIONS

Use of prospective randomization and minimization of confounding factors is the strength of the study. The small sample size is the limitation of the study.

CONCLUSIONS

Postpartum pelvic floor muscle strength and sexual function in primiparous women who have undergone uncomplicated vaginal deliveries can be significantly improved with the addition of sexually induced orgasm as a therapeutic tool along with physical exercises such as Kegels exercises in these women.

The Safe Practice of Female Genital Plastic Surgery

The purpose of this article is to guide surgeons in the safe practice of female genital plastic surgery when the number of such cases is steadily increasing. A careful review of salient things to look for in the patient's motivation, medical history, and physical examination can help the surgeon wisely choose best candidates. The anatomy is described, with particular attention given to the variations not generally described in textbooks or articles. Descriptions are included for labiaplasty, including clitoral hood reduction, majoraplasty, monsplasty, and perineoplasty with vaginoplasty. Reduction of anesthetic risks, deep venous thromboses, and pulmonary emboli are discussed, with special consideration for avoidance of nerve injury and compartment syndrome. Postoperative care of a variety of vulvovaginal procedures is discussed. Videos showing anatomic variations and surgical techniques of common female genital procedures with recommendations to reduce the complication rate are included in the article.

Previous obstetrical history does not impact short-term mid-urethral sling outcomes

Abstract

Introduction and hypothesis

Pregnancy and delivery are known risk factors for stress and mixed urinary incontinence. The most common surgical treatment is mid-urethral sling (MUS) surgery. This study evaluated the potential impact of the obstetrical history on the short-term subjective and objective failure rates after MUS surgery.

Methods

A registry-based surgical cohort study using data from the Medical Birth Registry of Norway (MBRN) and the national Norwegian Female Incontinence Registry (NFIR). Data from 14,787 women that underwent MUS surgery from 1998 to 2016 with complete registrations in the MBRN were included. Outcomes were 6–12-month postoperative subjective and objective failure rates. The potential impact of obstetrical and constitutional factors on both outcomes was tested in a multivariate logistic regression model.

Results

Several obstetrical variables seemed to impact both outcomes in the univariate analyses. However, in the multivariate analyses, none of the obstetrical variables significantly impacted subjective failure, and only being nulliparous before MUS surgery remained a risk factor for objective failure [aOR 1.60, (95% CI 1.07–2.40), p = 0.022]. High body mass index at time of surgery, non-retropubic slings, high preoperative urgency symptom load, and surgical complications were all strong risk factors for poor outcomes in the multivariate analyses.

Conclusion

Although childbirth is considered a risk factor for developing stress urinary incontinence, childbirth does not appear to affect the result of MUS in parous women. Our results suggest that nulliparous women with SUI may have a different pathophysiology than SUI after childbirth.

Supplementary Information

The online version contains supplementary material available at 10.1007/s00192-021-04836-5.

Clinical prediction is at the heart of preventing birth trauma and pelvic floor disorders for individual women

INTRODUCTION AND HYPOTHESIS

The purpose of this article is to understand that the majority of studies investigating the role of risk factors for maternal birth trauma and pelvic floor disorders are designed using causal inferential statistical methods and have not been designed to investigate the more useful goal of clinical prediction.

METHODS

A review of the literature was conducted to describe notable causal and predictive associations between risk factors and maternal birth trauma outcomes. Examples were obtained to illustrate and contrast differences in clinical usefulness between causal and predictive models.

RESULTS

Effects of pregnancy and childbirth on the risk of maternal birth trauma outcomes and subsequent pelvic floor disorders are an area of profound investigation. Numerous observational studies provide evidence that pregnancy and childbirth play a causal role in the increasing prevalence of these outcomes, and clinicians must rely on this observational evidence to guide decisions about preventing maternal birth trauma and pelvic floor disorders. However, there are important differences between the design and evaluation of models for a predictive context including: study design goals, inclusion or exclusion of candidate risk factors, model evaluation and the additional need to assess model error.

CONCLUSION

This article contrasts how causal and predictive modeling approaches are different and argues that indiscriminately modeling risk factors for birth trauma and pelvic floor disorder outcomes is costly to women.

Risk factors associated with stress urinary incontinence 12 years after first delivery

INTRODUCTION AND HYPOTHESIS

This study was aimed at investigating risk factors involved in stress urinary incontinence (SUI) 12 years after first delivery. We also evaluated cumulative incidence, severity, and impact on quality of life (QoL) of SUI. We hypothesized that changes during the first pregnancy might be associated with SUI long after delivery.

METHODS

A longitudinal cohort study was undertaken including primigravid women who delivered in our hospital during 2007. SUI was assessed following definitions of the International Continence Society. Severity was evaluated using the Incontinence Severity Index and impact on QoL with the International Consultation on Incontinence Questionnaire-Urinary Incontinence Short Form. Comparisons between continuous variables were performed using Student's t test and between qualitative variables using Chi-squared tests. A logistic regression model was constructed including variables that reached statistical significance (p < 0.05) in the univariate analysis.

RESULTS

During the inclusion period, 479 pregnant women were interviewed, 381 attended the 6-month follow-up, and 318 completed the questionnaires 12 years after and formed the study group. The cumulative incidence of SUI at 6 months and 12 years postpartum was 14.2% and 39.6% respectively. Generally, SUI severity was slight (73.0%) or moderate (28.9%) and its impact on QoL was low. Pregnancy SUI (OR: 2.14; 95% CI: 1.29-3.55) was independently associated with SUI 12 years postpartum.

CONCLUSION

The cumulative incidence of SUI increases markedly from 6 months to 12 years postpartum, being slight or moderate in severity and having a low impact on QoL in most cases. Developing SUI during pregnancy doubled the risk of SUI 12 years postpartum.

Safety in Female Genital Plastic Surgery

LEARNING OBJECTIVES

After studying this article, participants should be able to: (1) Identify the most appropriate type of anesthesia for the female genital plastic surgical patient and minimize risks of nerve injury and thromboembolic event through proper preoperative evaluation and knowledge of positioning. (2) Define the vulvovaginal anatomy, including common variants, and assess vulvovaginal tissues after childbirth and menopause. (3) Apply surgical techniques to minimize complications in female genital plastic surgery. (4) Classify the types of female genital mutilation/cutting and design methods of reconstruction after female genital mutilation/cutting.

SUMMARY

Female genital plastic surgery is growing in popularity and in numbers performed. This CME article covers several aspects of safety in the performance of these procedures. In choosing the best candidates, the impact of patient motivation, body mass index, parity, menopause and estrogen therapy is discussed. Under anesthesia, consideration for the risks associated with the dorsal lithotomy position and avoidance of compartment syndrome, nerve injury, deep venous thromboses, and pulmonary embolus are covered. Anatomical variations are discussed, as is the impact of childbirth on tissues and muscles. Surgical safety, avoidance of complications, and postoperative care of a variety of vulvovaginal procedures are discussed. Videos showing anatomical variations and surgical techniques of the most common female genital procedures with recommendations to reduce the complication rate are included in the article. Finally, female genital mutilation/cutting is defined, and treatment, avoidance of complications, and postoperative care are discussed.

Risk Factors for Postpartum Stress Urinary Incontinence: a Systematic Review and Meta-analysis

Stress urinary incontinence (SUI) is a distressing symptom affecting females globally and is one of the most common complications of delivery. The etiology of female SUI is multifactorial, and the trauma caused by delivery is one of the most important risk factors for SUI. We performed a meta-analysis to determine the relationship between these various factors and postpartum SUI. We searched PubMed, Embase, Web of Science, and the Cochrane Library until January 2019 using appropriate keywords and extracted 46 eligible studies that included 73,010 participants. The study protocol was registered with PROSPERO (No. CRD42020150094). The pooled results indicated that 12 risk factors, including vaginal delivery (OR 2.08, 95% CI 1.72-2.52), advanced age at gestation (OR 1.06, 95% CI 1.04-1.08), advanced maternal BMI (OR 1.04, 95% CI 1.03-1.06), excess weight gain during pregnancy (OR 1.13, 95% CI 1.00-1.26), advanced current BMI (OR 1.32, 95% CI 1.02-1.70), diabetes (OR 1.91, 95% CI 1.53-2.38), episiotomy (OR 1.76, 95% CI 1.06-2.94), forceps delivery (OR 2.69, 95% CI 1.25-5.76), gestational UI (OR 5.04, 95% CI 2.07-12.28), gestational SUI (OR 4.28, 95% CI 2.61-7.01), prenatal UI (OR 8.54, 95% CI 3.52-20.70), and early postpartum UI (OR 3.52, 95% CI 1.61-7.69), were associated with postpartum SUI. The findings of this analysis could serve to generate risk prediction models and provide a basis for developing treatment strategies for patients with postpartum SUI.

LncRNA and mRNA Expression Profiling in the Periurethral Vaginal Wall Tissues of Postmenopausal Women with Stress Urinary Incontinence

Stress urinary incontinence (SUI) is one of the major pelvic floor disorders affecting postmenopausal women. To investigate the lncRNA and mRNA expression profiling of SUI in postmenopausal women, we used a microarray analysis to examine the differentially expressed long noncoding RNAs (lncRNAs) and messenger RNAs (mRNAs) in the periurethral vaginal wall of postmenopausal women with SUI. A total of 8840 lncRNAs and 7102 mRNAs were dysregulated in the two groups (absolute fold change ≥ 2 and P < 0.05). The expression levels of five randomly selected lncRNAs and mRNAs were validated by quantitative real-time PCR. A functional analysis revealed that several lncRNAs are involved in the lysosome pathway associated with extracellular matrix (ECM) remodeling. In addition, we also found several mRNAs involved in fibroblast pseudopodia formation, fibroblast growth, and the regulation of smooth muscle cell differentiation in the urinary tract. Our study offers essential data regarding differentially expressed lncRNAs and mRNAs and may provide new potential candidates for the study of SUI.

Long-term risks of stress and urgency urinary incontinence after different vaginal delivery modes

BACKGROUND

Although operative delivery increases the risk of immediate pelvic floor trauma, no previous studies have adequately compared directly the effects of different kinds of instrumental vaginal deliveries on stress urinary incontinence and/or urgency urinary incontinence.

OBJECTIVE(S)

The objectives of the study were to estimate and compare the impact of different kinds of vaginal deliveries, including spontaneous, vacuum, and forceps, on stress and urgency urinary incontinence.

STUDY DESIGN

All women aged 20 years or older, living in 1 county in Norway were invited to participate in 2 surveys addressing stress and urgency urinary incontinence using validated questions, "Do you leak urine when you cough, sneeze, laugh, or lift something heavy?" and "Do you have involuntary loss of urine in connection with sudden and strong urge to void?" with response options yes or no. Incontinence data were linked to the Medical Birth Registry of Norway. For this study, we included only women who had a history of vaginal birth(s). Case definitions for stress and urgency urinary incontinence were moderate to severe based on Sandvik Severity Index (slight, moderate, severe). We adjusted analyses for age, parity, body mass index, and time since last delivery and addressed effect modification, including an age threshold of 50 years.

RESULTS

The final analysis included 13,694 women of whom 12.7% reported stress urinary incontinence and 8.4% urgency urinary incontinence. Among women aged younger than 50 years, there was a statistically significant difference in the risk of stress urinary incontinence for forceps delivery (odds ratio, 1.42, 95% confidence interval, 1.09-1.86, absolute difference 5.0%) but not for vacuum (odds ratio, 0.80, 95% confidence interval, 0.59-1.09) when compared with spontaneous vaginal delivery. Among women aged younger than 50 years, forceps also had increased risk for stress urinary incontinence (odds ratio, 1.76, 95% confidence interval, 1.20-2.60) when compared with vacuum. There was no association of stress or urgency urinary incontinence with mode of delivery in women aged 50 years or older.

CONCLUSION

For women aged younger than 50 years, forceps delivery is associated with significant increased long-term risk of stress urinary incontinence compared with other vaginal deliveries.

Prevalence of Stress Urinary Incontinence in Women with Premature Ovarian Insufficiency

Background: To determine the prevalence of stress urinary incontinence (SUI) and associated factors in women with premature ovarian insufficiency (POI). Materials and Methods: The study included 149 patients with POI and 303 control women without POI. Age, body mass index (BMI), gestational history, time since onset of POI, and status of hormone therapy (HT) for POI were recorded. Results: There was no statistical difference in the mean age, BMI, and parity between the two groups. The prevalence of SUI in the POI group tended to be higher than that in the control group (20.9%, 30/149 vs. 16.2%, 49/303), although not significantly (p = 0.297). About 41.6% (62/149) of patients with POI received HT. Patients with POI and SUI were older (p = 0.018) and had higher BMI (p = 0.007) than women with POI without SUI (p = 0.007). Compared to nulliparas, primiparas were more likely to have SUI (p = 0.046). However, SUI developed irrespective of time since onset of oligomenorrhea/amenorrhea or HT use. Furthermore, regression analysis showed that the prevalence of SUI was higher in women 30-39 years of age (odds ratio [OR] = 3.27, p = 0.002) and older than 40 years (OR = 7.78, p = 0.001). Primiparas (OR = 2.89, p = 0.001) and vaginal delivery (OR = 2.58, p = 0.023) were associated with SUI. Conclusions: The prevalence of SUI was fairly high among patients with POI, and age, parity, and vaginal delivery were the main risk factors. However, duration of POI and HT use had no effect on SUI. Increasing awareness of the importance of urinary system health in this population will improve the quality of life for these women.

Expert consensus document: Advances in the evaluation of anorectal function

Faecal incontinence and evacuation disorders are common, impair quality of life and incur substantial economic costs worldwide. As symptoms alone are poor predictors of underlying pathophysiology and aetiology, diagnostic tests of anorectal function could facilitate patient management in those cases that are refractory to conservative therapies. In the past decade, several major technological advances have improved our understanding of anorectal structure, coordination and sensorimotor function. This Consensus Statement provides the reader with an appraisal of the current indications, study performance characteristics, clinical utility, strengths and limitations of the most widely available tests of anorectal structure (ultrasonography and MRI) and function (anorectal manometry, neurophysiological investigations, rectal distension techniques and tests of evacuation, including defecography). Additionally, this article provides our consensus on the clinical relevance of these tests.

Delivery parameters, neonatal parameters and incidence of urinary incontinence six months postpartum: a cohort study

INTRODUCTION

Contradictory results have been reported regarding most delivery parameters as risk factors for urinary incontinence. We investigated the association between the incidence of urinary incontinence six months postpartum and single obstetric risk factors as well as combinations of risk factors.

MATERIAL AND METHODS

This study was based on the Norwegian Mother and Child Cohort Study, conducted by the Norwegian Institute of Public Health during 1998-2008. This substudy was based on 7561 primiparous women who were continent before and during pregnancy. Data were obtained from questionnaires answered at weeks 15 and 30 of pregnancy and six months postpartum. Data were linked to the Medical Birth Registry of Norway. Single and combined delivery- and neonatal parameters were analyzed by logistic regression analyses.

RESULTS

Birthweight was associated with significantly higher risk of urinary incontinence six months postpartum [3541-4180 g: odds ratio (OR) 1.4, 95% confidence interval (CI) 1.2-1.6; >4180 g: OR 1.6, 95% CI 1.2-2.0]. Fetal presentation, obstetric anal sphincter injuries, episiotomy and epidural analgesia were not significantly associated with increased risk of urinary incontinence. The following combinations of risk factors among women delivering by spontaneous vaginal delivery increased the risk of urinary incontinence six months postpartum; birthweight ≥3540 g and ≥36 cm head circumference; birthweight ≥3540 g and forceps, birthweight ≥3540 g and episiotomy; and ≥36 cm head circumference and episiotomy.

CONCLUSION

Some combinations of delivery parameters and neonatal parameters seem to act together and may increase the risk of incidence of urinary incontinence six months postpartum in a synergetic way.

Relationship between delivery modes and genitourinary syndrome among postmenopausal women

OBJECTIVES

Many postmenopausal women suffer from genitourinary syndrome of menopause (GSM) due to the lack of estrogen. This study aimed to evaluate the relationship between mode of delivery and GSM among postmenopausal women.

METHODS

We performed a case-control study of women who had had either vaginal delivery or Cesarean section. Data were collected through a sociodemographic questionnaire and a check list for assessing signs and symptoms of GSM. Subjective symptoms of vaginal atrophy (dryness, dyspareunia, itching, burning and paleness), pH of the vagina and maturation index were assessed and recorded. Data were analyzed using the χ² test and independent t-test.

RESULTS

A total of 125 postmenopausal women were recruited (65 with a history of normal vaginal delivery (NVD) and 60 with a history of Cesarean section). Vaginal pH was more commonly lower (pH 5-5.49) in the NVD group (50.8% vs. 40%) (p < 0.001). The maturation index was also better in the NVD group (42.7 ± 6.34 vs. 24.08 ± 8.2) (p < 0.001). All symptoms of vaginal atrophy including paleness, dryness, itching, dyspareunia and burning were significantly less in the NVD group compared to the Cesarean section group (p < 0.05).

CONCLUSION

Postmenopausal women with a history of normal vaginal delivery were less likely to have GSM compared to the women with a history of Cesarean section. Other prospective studies can explore this relationship better.

Stress urinary incontinence in women as a medical, social, psychological and economic problem – assessing the extent of knowledge of students graduating in medical fields

Stress urinary incontinence occurs when there is an increase in pressure inside the abdomen accompanied by involuntary leakage of urine associated with coughing, sneezing, laughing or demanding physical labour. It is a serious condition that isolates women from society, prevents efficient functioning, limits social contacts and forces a change in lifestyle. The fear of leakage of urine and odour arouses embarrassment, adversely affecting the psyche - leading to decreased self-esteem, neurosis and depression. In addition, in the absence of appropriate hygiene measures, or the lack of financial resources to acquire them, incontinence can be a factor excluding women from normal life. The aim of this study was to assess the extent of knowledge of students graduating in medical fields on stress urinary incontinence in women as a medical, social, psychological and economic problem. The study involved 1,581 students during their final year of medical studies, studying at various universities. The study involved 1,255 women and 326 men. We created a questionnaire which was verified by the CEM - Institute for Market Research and Public Opinion in Krakow. The largest percentage of respondents (95%) in all groups believes that stress urinary incontinence is primarily a medical problem, approx. 92% of respondents also regarded it as a psychological problem. It was shown that stress urinary incontinence in women was found to be a medical, social, psychological and economical problem by more than half of the students of medical, obstetric and nursing fields.

Long-term Impact of Mode of Delivery on Stress Urinary Incontinence and Urgency Urinary Incontinence: A Systematic Review and Meta-analysis

Context

Stress urinary incontinence (SUI) and urgency urinary incontinence (UUI) are associated with physical and psychological morbidity, and large societal costs. The long-term effects of delivery modes on each kind of incontinence remain uncertain.

Objective

To investigate the long-term impact of delivery mode on SUI and UUI.

Evidence acquisition

We searched Medline, Scopus, CINAHL, and relevant major conference abstracts up to October 31, 2014, including any observational study with adjusted analyses or any randomized trial addressing the association between delivery mode and SUI or UUI ≥1 yr after delivery. Two reviewers extracted data, including incidence/prevalence of SUI and UUI by delivery modes, and assessed risk of bias.

Evidence synthesis

Pooled estimates from 15 eligible studies demonstrated an increased risk of SUI after vaginal delivery versus cesarean section (adjusted odds ratio [aOR]: 1.85; 95% confidence interval [CI], 1.56–2.19; I² = 57%; risk difference: 8.2%). Metaregression demonstrated a larger effect of vaginal delivery among younger women (p = 0.005). Four studies suggested no difference in the risk of SUI between spontaneous vaginal and instrumental delivery (aOR: 1.11; 95% CI, 0.84–1.45; I² = 50%). Eight studies suggested an elevated risk of UUI after vaginal delivery versus cesarean section (aOR: 1.30; 95% CI, 1.02–1.65; I² = 37%; risk difference: 2.6%).

Conclusions

Compared with cesarean section, vaginal delivery is associated with an almost twofold increase in the risk of long-term SUI, with an absolute increase of 8%, and an effect that is largest in younger women. There is also an increased risk of UUI, with an absolute increase of approximately 3%.

Patient summary

In this systematic review we looked for the long-term effects of childbirth on urinary leakage. We found that vaginal delivery is associated with an almost twofold increase in the risk of developing leakage with exertion, compared with cesarean section, with a smaller effect on leakage in association with urgency.

Perineal outcome and the risk of pelvic floor dysfunction: a cohort study of primiparous women

BACKGROUND

Pelvic floor dysfunction (PFD) is the most common complication of childbirth. Assumptions have been made that perineal trauma increases the risk of PFD compared to an intact perineum, however the evidence for this is lacking. The aim of this study was to explore the relationship between perineal outcome and postpartum PFD.

MATERIALS AND METHODS

Prospective cohort study design, with a self-reported quality of life (QOL) questionnaire mailed to all primiparous women with a non-instrumental delivery at The Townsville Hospital between 2011 and 2012 (n = 766). ANOVA was used to compare how the symptoms of PFD affect QOL in women with an intact perineum, episiotomy or spontaneous tear.

RESULTS

Seventy-nine percent of the population had perineal injury; 60% had a spontaneous tear and 19% had an episiotomy. Ninety-seven percent of women who completed the questionnaire (n = 196) complained of PFD symptoms. Women with episiotomy had the best QOL, reporting the lowest levels of urinary dysfunction (statistically significant). No differences between the groups were found for symptoms of bowel, prolapse or sexual dysfunction.

CONCLUSIONS

This study shows a relationship between perineal outcome and PFD and suggests that an episiotomy is associated with the least morbidity due to symptoms of urinary incontinence. Additional large-scale prospective research is required to further investigate and delineate the impact of childbirth on PFD.

Is the Diabetic Bladder a Neurogenic Bladder? Evidence from the Literature

Diabetes can often cause LUTS. This has been called diabetic cystopathy by many authors, but no concise grouping of symptoms for this condition has been agreed upon. The etiology of diabetic cystopathy remains unknown, but evidence from the literature strongly suggests a neurologic etiology as the primary factor, with other factors such as polyuria, damage to muscle from oxidative stress, and urothelial factors possibly contributing. Once a standard definition for diabetic cystopathy can be agreed upon, prospective, longitudinal studies will play a key role in the generation of hypotheses for the causes of diabetic cystopathy. Animal models will help test these hypotheses and possibly provide strategies for prevention.

Nongenetic factors associated with stress urinary incontinence

OBJECTIVE

To explore the role of hereditary and environmental factors on the development of stress urinary incontinence in a large cohort of identical and nonidentical twins.

METHODS

This is a large, population-based, classic twin study of twin sisters recruited to complete a health survey at the world's largest annual twins festival during 2003-2008. Concordance rates were calculated and structural equation models were used to estimate the contribution of genetic effects compared with environmental factors toward the development of stress urinary incontinence.

RESULTS

Eight hundred eighty-two twin sister pairs (n=1,764), including 765 identical and 117 nonidentical twin sister pairs, completed the questionnaires. Sequential structural equation modeling revealed that common environmental factors contributed 77.6% (95% confidence interval [CI], 41.4-83.8; P<.001) of the variance and unique environmental factors contributed 20.9% (95% CI, 15.8-26.7; P<.001) of the variance. The effect of genetics was not statistically significant at 1.49% (95% CI, 0.0-38.8; P=.46).

CONCLUSION

Female stress urinary incontinence is more a consequence of environmental risk factors than heredity. This epidemiologic insight should be considered in preventive health efforts.

LEVEL OF EVIDENCE

II.

Pelvic floor disorders after vaginal birth: effect of episiotomy, perineal laceration, and operative birth

OBJECTIVE

To investigate whether episiotomy, perineal laceration, and operative delivery are associated with pelvic floor disorders after vaginal childbirth.

METHODS

This is a planned analysis of data for a cohort study of pelvic floor disorders. Participants who had experienced at least one vaginal birth were recruited 5-10 years after delivery of their first child. Obstetric exposures were classified by review of hospital records. At enrollment, pelvic floor outcomes, including stress incontinence, overactive bladder, anal incontinence, and prolapse symptoms were assessed with a validated questionnaire. Pelvic organ support was assessed using the Pelvic Organ Prolapse Quantification system. Logistic regression analysis was used to estimate the relative odds of each pelvic floor disorder by obstetric history, adjusting for relevant confounders.

RESULTS

Of 449 participants, 71 (16%) had stress incontinence, 45 (10%) had overactive bladder, 56 (12%) had anal incontinence, 19 (4%) had prolapse symptoms, and 64 (14%) had prolapse to or beyond the hymen on examination. Forceps delivery increased the odds of each pelvic floor disorder considered, especially overactive bladder (odds ratio [OR] 2.92, 95% confidence interval [CI] 1.44-5.93), and prolapse (OR 1.95, 95% CI 1.03-3.70). Episiotomy was not associated with any of these pelvic floor disorders. In contrast, women with a history of more than one spontaneous perineal laceration were significantly more likely to have prolapse to or beyond the hymen (OR 2.34, 95% CI 1.13-4.86). Our multivariable results suggest that one additional woman would have development of prolapse for every eight women who experienced at least one forceps birth (compared with delivering all her children by spontaneous vaginal birth).

CONCLUSION

Forceps deliveries and perineal lacerations, but not episiotomies, were associated with pelvic floor disorders 5-10 years after a first delivery.

LEVEL OF EVIDENCE

II.

Uterine leiomyomata associated with self-reported stress urinary incontinence

AIMS

To investigate the association between the presence and characteristics of uterine leiomyomata (UL) and self-reported stress urinary incontinence (SUI).

METHODS

The study included 836 premenopausal participants (474 African American and 362 Caucasian) in the National Institute of Environmental Health Sciences (NIEHS) Uterine Fibroid Study. UL were characterized at baseline with ultrasound screening, and SUI was assessed at follow-up (after 4 years, on average). Linear risk models were used to estimate adjusted prevalence differences (aPD) and 95% confidence intervals (CI), controlling for age, ethnicity, body mass index (BMI), and number of deliveries.

RESULTS

Compared with women without UL, SUI prevalence was higher among women with any UL (aPD = 7.4%, 95% CI 0.4-14.3) and women with UL 2-4 cm (aPD = 9.6%, 95% CI 1.3-17.9). Marginally significant results were found for the presence of UL > or =4 cm and anterior UL > or =2 cm.

CONCLUSIONS

The observed 7% increase in prevalence of this common condition for women with UL is of clinical importance. Further research is needed before concluding that treatment for larger UL might enhance SUI treatment in some women.

Association Between Mode of Birth and Self-Reported Maternal Physical and Psychological Health Problems at 10 Weeks Postpartum

AIM:To determine the association between mode of birth and physical and psychological health problems reported at 10 weeks postpartum.

METHODS:A cross-sectional, self-report survey was completed by 2,699 Western Australian women at 10 weeks postpartum. Information on birth mode and physical and psychological health was sought. Descriptive statistics and frequency distributions were performed to describe the sample. Logistic regression was used to determine the association between mode of birth and the reported number of physical health problems (two or more and three or more) and two psychological health problems.

RESULTS:The occurrence of physical health problems for all women were incontinence (11.5%), no bowel control (2.6%), backache (41%), heavy bleeding (14.1%), and excessive fatigue or tiredness (35.7%). A significant association was found between all cesarean sections (elective and emergency) and the number of physical health problems compared to spontaneous vaginal births. Women who had an emergency cesarean were most likely (OR= 3.15, CI = 2.40–4.13,p< 0.0005) to report two or more physical problems, whereas women who had an elective cesarean were more likely (OR= 2.75, CI = 2.08–3.63,p< 0.0005) to report three or more physical problems.

Nearly 15% of women reported being unhappy for more than a few days. This was highest in women having an emergency cesarean (16.4%) and lowest in women giving birth spontaneously (13.5%). Some 6.4% of women stated they were constantly reliving negative thoughts of birth and/or labor. Women who had an emergency cesarean were more likely (OR= 3.10, CI = 1.96–4.89,p< 0.0005) to choose this item and they were also more likely (OR= 2.04, CI = 1.01–4.13,p< 0.047) to experience both psychological health items.

CONCLUSION:Women’s reports of health problems within the first 10 weeks postpartum are concerning and warrant ongoing attention. The prevalence of health problems was higher in women who had experienced a cesarean. This information on morbidity postbirth is essential for women and their care providers in making informed decisions around available birth options.

Combined ischemic and neuropathic insult to the anal canal in an animal model of obstetric-related trauma

BACKGROUND

Childbirth, in particular, when it involves instrumental vaginal delivery, can result in direct trauma to the external anal sphincter muscle. In addition, a global injury to the pelvic floor, including neurovascular injury to the anal sphincter complex, may occur.

OBJECTIVE

The aims of this study were to determine whether sensory drive from the anal canal and oxygenation of the external anal sphincter were compromised during simulated labor in a validated animal model of obstetric trauma.

DESIGN

Fifteen female Wister rats were operated on. Group 1 (n = 5) underwent pelvic balloon compression for 1 hour to simulate increased pelvic pressure during childbirth. Somatosensory cortical potentials, evoked by electrically stimulating the anal canal, were tracked. In group 2 (sham), the balloons were not inflated. In group 3, tissue PO2 values of the external anal sphincter and femoral arterial blood flow were measured simultaneously during the period of balloon inflation.

RESULTS

The peak amplitude of cortical evoked potentials was reduced (from 11.8 ± 1.5 μV to 3.1 ± 1.1 μV) during pelvic compression (p = 0.002, ANOVA). During this period, arterial blood flow to the hindlimb and the external anal sphincter tissue PO2 decreased by 20% (p < 0.001) and 60% (p < 0.001).

CONCLUSION

Pelvic compression that mimics obstetric trauma is associated with diminished anocortical drive. This neural insult may be compounded by concomitant ischemia of the external anal sphincter.

Bladder pain syndrome/interstitial cystitis in twin sisters

PURPOSE

We determined the genetic contribution of and associated factors for bladder pain syndrome using an identical twin model.

MATERIALS AND METHODS

Multiple questionnaires were administered to adult identical twin sister pairs. The O'Leary-Sant Interstitial Cystitis Symptom and Problem Index was administered to identify individuals at risk for bladder pain syndrome. Potential associated factors were modeled against the bladder pain syndrome score with the twin pair as a random effect of the factor on the bladder pain syndrome score. Variables that showed a significant relationship with the bladder pain syndrome score were entered into a multivariable model.

RESULTS

In this study 246 identical twin sister pairs (total 492) participated with a mean age (± SD) of 40.3 ± 17 years. Of these women 45 (9%) were identified as having a moderate or high risk of bladder pain syndrome (index score greater than 13). There were 5 twin sets (2%) in which both twins met the criteria. Correlation of bladder pain syndrome scores within twin pairs was estimated at 0.35, suggesting a genetic contribution to bladder pain syndrome. Multivariable analysis revealed that increasing age (estimate 0.46 [95% CI 0.2, 0.7]), irritable bowel syndrome (1.8 [0.6, 3.7]), physical abuse (2.5 [0.5, 4.1]), frequent headaches (1.6 [0.6, 2.8]), multiple drug allergies (1.5 [0.5, 2.7]) and number of self-reported urinary tract infections in the last year (8.2 [4.7, 10.9]) were significantly associated with bladder pain syndrome.

CONCLUSIONS

Bladder pain syndrome scores within twin pairs were moderately correlated, implying some genetic component. Increasing age, irritable bowel syndrome, frequent headaches, drug allergies, self-reported urinary tract infections and physical abuse were factors associated with higher bladder pain syndrome scores.

Pelvic floor disorders 5-10 years after vaginal or cesarean childbirth

OBJECTIVE

To estimate differences in pelvic floor disorders by mode of delivery.

METHODS

We recruited 1,011 women for a longitudinal cohort study 5-10 years after first delivery. Using hospital records, we classified each birth as: cesarean without labor, cesarean during active labor, cesarean after complete cervical dilation, spontaneous vaginal birth, or operative vaginal birth. At enrollment, stress incontinence, overactive bladder, anal incontinence, and prolapse symptoms were assessed with a validated questionnaire. Pelvic organ support was assessed using the Pelvic Organ Prolapse Quantification system. Logistic regression analysis was used to estimate the relative odds of each pelvic floor disorder by obstetric history, adjusting for relevant confounders.

RESULTS

Compared with cesarean without labor, spontaneous vaginal birth was associated with a significantly greater odds of stress incontinence (odds ratio [OR] 2.9, 95% confidence interval [CI] 1.5-5.5) and prolapse to or beyond the hymen (OR 5.6, 95% CI 2.2-14.7). Operative vaginal birth significantly increased the odds for all pelvic floor disorders, especially prolapse (OR 7.5, 95% CI 2.7-20.9). These results suggest that 6.8 additional operative births or 8.9 spontaneous vaginal births, relative to cesarean births, would lead to one additional case of prolapse. Among women delivering exclusively by cesarean, neither active labor nor complete cervical dilation increased the odds for any pelvic floor disorder considered, although the study had less than 80% power to detect a doubling of the odds with these exposures.

CONCLUSION

Although spontaneous vaginal delivery was significantly associated with stress incontinence and prolapse, the most dramatic risk was associated with operative vaginal birth.

LEVEL OF EVIDENCE

II.

Urge incontinence: estimating environmental and obstetrical risk factors using an identical twin study

INTRODUCTION AND HYPOTHESIS

The objective of this study was to determine risk factors for urge urinary incontinence (UUI).

METHODS

A multi-item survey was administered to a community sample of identical twin sisters from 2002-2008. Generalized estimating equations accounting for co-twin correlation were used to perform three different regression models on the outcome: UUI (yes vs. no).

RESULTS

Mean age, median parity, and BMI were 41.4 +/- 16.4 (18-85), 1.0, and 26.0 +/- 6.5 (13.5-55.8), respectively. Thirty-five percent of women were post-menopausal, and 27.5% had UUI. Urge urinary incontinence was reported in 40.1% of parous versus 14.1% among nulliparous women (p < .0001). The rate of UUI was 40.6% after vaginal delivery, 36.7% after cesarean delivery, and 14.1% in nulliparous women (p < .0001). Obesity, age >40, and chronic constipation were also identified as risk factors for urge urinary incontinence.

CONCLUSION

Risk factors for UUI include parity, age, obesity, and chronic constipation. There was a 2.5-fold increased risk of UUI after one or more births, regardless of type of delivery.

Animal models of diabetic uropathy

PURPOSE

Diabetes mellitus is a group of debilitating and costly diseases with multiple serious complications. Lower urinary tract complications or diabetic uropathy are among the most common complications of diabetes mellitus, surpassing widely recognized complications such as neuropathy and nephropathy. Diabetic uropathy develops in individuals with types 1 and 2 diabetes, and little is known about the natural history of these common and troublesome complications. Animal models have the potential to reveal mechanisms and aid in the development of treatment strategies.

MATERIALS AND METHODS

We present a review of available animal models of diabetes mellitus relative to their use in the study of diabetic uropathy.

RESULTS

Large and small animal models of diabetes mellitus are available. While large animals such as dogs and swine may closely mirror the human disease in size and phenotype, the time between diabetic complication onset and development, and associated husbandry expenditures can make acquiring data on statistically valid sample sizes prohibitively expensive. In contrast, small animal models (rats and mice) have much lower expenditures for a larger number of animals and compressed observation time due to a shorter life span. Also, mice are readily manipulated genetically to facilitate the isolation of the effect of single genes (transgenic and knockout mice). Type 1 diabetes mellitus can be induced chemically with streptozotocin, which is selectively toxic to pancreatic beta cells. Type 2 diabetes mellitus models have been developed by selective breeding for hyperglycemia with or without associated obesity. Diabetic uropathy has been noted in several well characterized, predictable animal models of diabetes mellitus.

CONCLUSIONS

Diabetic uropathy, including diabetic bladder dysfunction, has been more frequently studied in small animals with type I diabetes. The recent availability of transgenic models provides a new opportunity for further studies of diabetic uropathy in mouse models of types I and II diabetes mellitus.

The association between acquired urinary sphincter mechanism incompetence in bitches and early spaying: a case-control study

A case-control study was conducted between December 2005 and August 2006 in London (1) to estimate the strength of association between early ovariohysterectomy (spaying) and urinary incontinence (sphincter mechanism incompetence), (2) to identify other risk factors for incontinence, and (3) to assess any implications of incontinence on the owner-pet relationship. Cases were defined as bitches that developed incontinence after spaying and were treated, and the controls comprised continent spayed bitches. Questionnaires from 202 cases were compared to 168 controls, and analysed using multivariable logistic regression. No significant association between early spaying and incontinence was detected although there was a tendency that early spayed bitches were less likely to be incontinent. Docked bitches were 3.8 times more likely to be incontinent than undocked bitches; bitches weighing over 10 kg were 3.7 times more likely to be incontinent than smaller dogs; and older bitches were more likely to be incontinent (OR=3.1-23.8) than younger animals. Some owners were found to have a negative attitude towards incontinence.

The epidemiological study of women with urinary incontinence and risk factors for stress urinary incontinence in China

OBJECTIVE

The aim of this study was to evaluate the prevalence and associated risk factors of urinary incontinence (UI) in Chinese women.

METHODS

In the cross-sectional survey, 20,000 Chinese women 20 years or older were randomly selected and interviewed with modified Bristol Female Lower Urinary Tract Symptoms questionnaires to estimate population prevalence rates and identify potential risk factors.

RESULTS

A total of 19,024 women were included in the analysis and 976 excluded; qualified rate is 95% (19,024/20,000). Of the Chinese women aged from 20 to 99 years (mean +/- SD, 45 +/- 16 y), the overall prevalence rate of UI was 30.9%. Estimates of stress urinary incontinence (SUI), urge urinary incontinence, and mixed urinary incontinence prevalence were 18.9%, 2.6%, and 9.4%, with a corresponding proportional distribution of 61%, 8%, and 31%, respectively. The prevalence of mixed urinary incontinence increased with aging, whereas the prevalence of SUI peaked in the group of women aged 50 years and that of urge urinary incontinence in the group of women aged 70 years. Only 25% of women have consulted doctors on this issue. Through multivariable logistic regression analysis, we identified age, vaginal delivery, multiparity, alcohol consumption, central obesity (women's waist circumference, >/=80 cm), constipation, chronic pelvic pain, history of respiratory disease, gynecological events, pelvic surgery, and perimenopause and postmenopause status as potential risk factors for SUI, among which age, vaginal delivery, and multiparity are three major risk factors.

CONCLUSIONS

Our findings suggest that the prevalence of UI is high in China, with SUI as the most common subtype. Age, vaginal delivery, and others are risk factors for SUI.

RETRACTED: The effect of the mode of delivery on the quality of life, sexual function, and sexual satisfaction in primiparous women and their husbands

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal). This article has been retracted at the request of the Editor-in-Chief. Following the retraction of Dr. Safarinej ad's work by other journals, The Journal of Sexual Medicine has undertaken an extensive re-review of all papers Dr. Safarinejad published with the journal. Following an intensive re-evaluation and close scrutiny of the manuscripts, our expert reviewers raised multiple concerning questions about the methodology, results, and statistical interpretation as presented in this article. Dr. Safarinejad was contacted to provide his original data and offer explanations to address the concerns expressed by the reviewers. Dr Safarinejad chose not to respond. The co-authors of the article have also been contacted and did not respond either. Consequently, we can no longer verify the results or methods as presented and therefore retract the article.

Electrophysiological function during voiding after simulated childbirth injuries

During vaginal delivery dual injuries of the pudendal nerve and the external urethral sphincter (EUS), along with other injuries, are correlated with later development of stress urinary incontinence. It is not known how combinations of these injuries affect neuromuscular recovery of the micturition reflex. We investigated the EUS electromyogram (EMG) and the pudendal nerve motor branch potentials (PNMBP) during voiding 4 days, 3 weeks or 6 weeks after injury; including vaginal distension (VD), pudendal nerve crush (PNC), both PNC and VD (PNC+VD), and pudendal nerve transection (PNT); and in controls. Pudendal nerve and urethral specimens were excised and studied histologically. No bursting activity was recorded in the EUS EMG during voiding 4 days after all injuries, as well as 3 weeks after PNC+VD. Bursting activity demonstrated recovery 3 weeks after either VD or PNC and 6 weeks after PNC+VD, but the recovered intraburst frequency remained significantly decreased compared to controls. Bursting results of PNMBP were similar to the EMG, except bursting in PNMBP 4 days after VD and the recovered intraburst frequency was significantly increased compared to controls after PNC and PNC+VD. After PNT, neither the EUS nor the pudendal nerve recovered by 6 weeks after injury. Our findings indicate bursting discharge during voiding recovers more slowly after PNC+VD than after either PNC or VD alone. This was confirmed histologically in the urethra and the pudendal nerve and may explain why pudendal nerve dysfunction has been observed years after vaginal delivery.

Impact of route of delivery on continence and sexual function

Urinary and fecal incontinence have been linked to pregnancy and childbirth. This article reviews the rates of pelvic floor dysfunction following vaginal delivery and cesarean section as cited in short-term and long-term follow-up studies.

Impact of hysterectomy on stress urinary incontinence: an identical twin study

OBJECTIVE

This study uses the unique properties of twin research design to evaluate whether hysterectomy impacts stress urinary incontinence (SUI).

STUDY DESIGN

As part of the Evanston Twins Sister Study, we performed bivariate and multivariate analyses on 83 identical twin pairs discordant for hysterectomy.

RESULTS

In bivariate analysis, SUI was less common in women who had prior hysterectomy (P =0.028). Multivariate analysis suggested that SUI was significantly less common after hysterectomy (odds ratio [OR], 0.55, confidence interval [CI], 0.30 to 1.00). Exclusion of twin pairs with a history of pelvic floor defect surgery eliminated the statistical relationship between hysterectomy and SUI (OR, 0.79, CI, 0.4 to 1.40).

CONCLUSION

Hysterectomy, when analyzed with all cases, was associated with reduced SUI. When concurrent pelvic floor defect surgeries were excluded from the analysis, we found no relationship between hysterectomy and the risk of SUI afterward.

Familial transmission of urogenital prolapse and incontinence

PURPOSE OF REVIEW

To summarize recent evidence suggesting a genetic basis for the development of urogenital prolapse and stress urinary incontinence.

RECENT FINDINGS

Epidemiological evidence suggests that some women have a genetic predisposition to the development of urogenital prolapse and stress incontinence. Abnormal expression of various structural proteins is thought to be the molecular genetic mechanism for the development of these conditions. A group of families with an autosomal dominant pattern of transmission of urogenital prolapse with high penetrance has been identified. No similar cohort of families with familial stress incontinence currently exists, although candidate genes have been identified that appear to predispose women to urogenital prolapse and stress incontinence. Additionally, animal models of urogenital prolapse have been developed that closely parallel the development of prolapse in humans.

SUMMARY

A growing body of evidence suggests a genetic basis for the development of urogenital prolapse and stress incontinence. Candidate genes have been identified that may result in alteration of the normal metabolism of various structural proteins which may ultimately predispose some women to both urogenital prolapse and stress incontinence. Further research into the genetic basis of these conditions may provide a comprehensive understanding of the biological basis of these disorders.