Comparative-fill urodynamics in individuals with and without detrusor overactivity supports a conceptual model for dynamic elasticity regulation.

AIMS: Dynamic elasticity was previously identified in individuals with overactive bladder (OAB) using comparative-fill urodynamics (UD) and is a biomechanical mechanism for acutely regulating detrusor wall tension. On the basis of this data, a conceptual model of dynamic elasticity regulation mediated through a balance of passive mechanisms and active contractions was constructed. The present study tested this model by determining whether individuals with detrusor overactivity (DO) exhibit less dynamic elasticity than individuals without DO. METHODS: Individuals with and without urgency based on International Consultation on Incontinence Questionnaire-OAB surveys were prospectively enrolled in a comparative-fill UD study. An initial fill defined the presence or absence of DO and determined cystometric capacity. Three additional fills were employed with either passive emptying via a catheter or active voiding. To identify dynamic elasticity, average filling pressures (Pves ) were compared for fill 1 (before strain softening), fill 2 (after strain softening), and fill 3 (after active void). A dynamic elasticity index was defined. RESULTS: From 28 participants, those without DO showed decreased Pves during filling after strain softening and restored Pves during filling following active voiding, revealing dynamic elasticity. Participants with DO did not show dynamic elasticity. A dynamic elasticity index less than 1.0 cmH2 O/40% capacity was identified in 2 out of 13 participants without DO and 9 out of 15 with DO, revealing a significant association between DO and reduced/absent dynamic elasticity (P = .024). CONCLUSIONS: This study supports a conceptual model for dynamic elasticity, a mechanism to acutely regulate detrusor wall tension through a balance of competing active contractile and passive strain mechanisms. Improved understanding of this mechanistic model may help us to identify novel treatment strategies for OAB.

A pilot study to measure dynamic elasticity of the bladder during urodynamics.

AIMS: Previous studies using isolated strips of human detrusor muscle identified adjustable preload tension, a novel mechanism that acutely regulates detrusor wall tension. The purpose of this investigation was to develop a method to identify a correlate measure of adjustable preload tension during urodynamics. METHODS: Patients reporting urgency most or all of the time based on ICIq-OAB survey scores were prospectively enrolled in an extended repeat fill-and-empty urodynamics study designed to identify a correlate of adjustable preload tension which we now call "dynamic elasticity." Cystometric capacity was determined during initial fill. Repeat fills to defined percentages of capacity with passive emptying (via syringe aspiration) were performed to strain soften the bladder. A complete fill with active voiding was included to determine whether human bladder exhibits reversible strain softening. RESULTS: Five patients completed the extended urodynamics study. Intravesical pressure (pves ) decreased with subsequent fills and was significantly lower during Fill 3 compared to Fill 1 (P = 0.008), demonstrating strain softening. Active voiding after Fill 3 caused strain softening reversal, with pves in Fill 4 returning to the baseline measured during Fill 1 (P = 0.29). Dynamic elasticity, the urodynamic correlate of adjustable preload tension, was calculated as the amount of strain softening (or its reversal) per %capacity (Δaverage pves between fills/Δ%capacity). Dynamic elasticity was lost via repeat passive filling and emptying (strain softening) and regained after active voiding regulated the process (strain softening reversal). CONCLUSIONS: Improved understanding of dynamic elasticity in the human bladder could lead to both improved sub-typing and novel treatments of overactive bladder. Neurourol. Urodynam. 36:1086-1090, 2017. © 2016 Wiley Periodicals, Inc.

Sequential compression device compliance in postoperative obstetrics and gynecology patients.

OBJECTIVE: To assess the association of patient and nursing education on sequential compression device compliance in patients who have undergone major obstetric or benign gynecologic procedures. METHODS: We performed a prospective observational study on all English-speaking patients who underwent cesarean delivery or benign gynecologic surgery and were prescribed to wear sequential compression devices postoperatively at a university medical center. The 4-month study was divided into 1-month segments. The first month consisted of baseline observations of compliance. The second month was comprised of structured patient education, the third month involved nursing education, and the final month included both interventions. Observations were made twice daily. All educational interventions and observations were performed by two coauthors. A patient was noted to be compliant if she was ambulating, sitting, or lying in bed with sequential compression devices applied, tubing attached, and the machine powered on. RESULTS: A total of 859 observations was recorded for 228 patients. The number of hospitalization days ranged from 1 to 13 (mean 2.40 days, median 2 days). There was no difference in compliance among the months with 141 of 230 (61.3%), 106 of 194 (54.6%), 155 of 277 (56.0%), and 95 of 158 (60.1%) compliance for each consecutive month (P=.44). Noncompliance increased with each successive postoperative day (odds ratio 1.18 per day, 95% confidence interval 1.07-1.30). The most common patient-stated reason for noncompliance was "the nurse said I don't need them anymore" (82/362 observations [22.6%]). Overall, cesarean delivery was associated with the lowest rate of compliance when compared with gynecologic surgeries (272/519 [52.4%] compared with 225/340 [66.2%], P<.001). CONCLUSION: Compliance with postoperative use of sequential compression devices is approximately 58% and did not improve with patient or nursing educational interventions. LEVEL OF EVIDENCE: III.

Unanticipated uterine pathologic finding after morcellation during robotic-assisted supracervical hysterectomy and cervicosacropexy for uterine prolapse.

BACKGROUND: Identification of occult malignancy after intra-abdominal morcellation at the time of robotic-assisted supracervical hysterectomy and cervicosacropexy for uterine prolapse may lead to challenging postoperative management and leads one to question the need for preoperative evaluation. CASES: We present 2 cases of occult endometrial carcinoma after robotic-assisted supracervical hysterectomy and cervicosacropexy with intra-abdominal uterine morcellation from January 2008 to December 2010. A total of 63 patients underwent the stated surgical procedure with 2 patients (3.17%) found to have abnormal uterine pathologic finding with International Federation of Gynecology and Obstetrics grade 1 endometrial adenocarcinoma. Both cases occurred in asymptomatic postmenopausal patients without risk factors for endometrial cancer, including no history of postmenopausal bleeding or hormone replacement therapy. Owing to intraoperative uterine morcellation and cervical retention, appropriate postoperative management was controversial and problematic. Each patient was referred to gynecologic oncology. To date, both patients are without evidence of residual disease. CONCLUSION: Owing to the risk of occult uterine pathologic finding and complicated postoperative management, preoperative endometrial assessment should be considered on all postmenopausal patients undergoing intra-abdominal uterine morcellation, regardless of risk factors.

Surgical management of apical pelvic support defects: the impact of robotic technology.

INTRODUCTION AND HYPOTHESIS: Our aim was to determine what effect access to robotic technology had on our approach to managing apical pelvic support defects. METHODS: This was a retrospective chart review of 187 pelvic floor reconstructive surgeries performed for the 18 months prior to (time period 1: January 2007 to July 2008) and following (time period 2: July 2009 to December 2009) the introduction of the robot. Chi-square was used to compare percentages, and analysis of variance (ANOVA) was used to compare demographic data among groups. RESULTS: Overall, 187 procedures were performed for apical prolapse during the study period: 61 in time period 1 and 126 in time period 2. Following the introduction of robotic technology, a significant change from vaginal to abdominal reconstruction occurred. Uterosacral ligament suspension declined from 67 % to 22 % (p < 0.0001), whereas sacrocolpopexy increased from 25 % (15/61) to 66 % (83/126) (p < 0.0001). The rate of abdominal sacrocolpopexy, however, declined from 25 % (15/61) to 2 % (2/126) over the two time periods (p < 0.0001). CONCLUSION: The introduction of robotic technology significantly affected the surgical procedure and mode of surgical access for repair of apical pelvic support defects.