scholarly journals Diffusion tensor-based fiber tracking of the male urethral sphincter complex in patients undergoing radical prostatectomy: a feasibility study

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Ana S. C. Verde ◽  
Joao Santinha ◽  
Eunice Carrasquinha ◽  
Nuno Loucao ◽  
Ana Gaivao ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Radical Prostatectomy ◽  
Regional Differences ◽  
Eddy Currents ◽  
Diffusion Tensor ◽  
Mean Diffusivity ◽  
Fiber Tracking ◽  
Urinary Continence ◽  
Urethral Sphincter ◽  
Sphincter Complex

Abstract Objectives To study the diffusion tensor-based fiber tracking feasibility to access the male urethral sphincter complex of patients with prostate cancer undergoing Retzius-sparing robot-assisted laparoscopic radical prostatectomy (RS-RARP). Methods Twenty-eight patients (median age of 64.5 years old) underwent 3 T multiparametric-MRI of the prostate, including an additional echo-planar diffusion tensor imaging (DTI) sequence, using 15 diffusion-encoding directions and a b value = 600 s/mm2. Acquisition parameters, together with patient motion and eddy currents corrections, were evaluated. The proximal and distal sphincters, and membranous urethra were reconstructed using the deterministic fiber assignment by continuous tracking (FACT) algorithm, optimizing fiber tracking parameters. Tract length and density, fractional anisotropy (FA), axial diffusivity (AD), mean diffusivity (MD), and radial diffusivity (RD) were computed. Regional differences between structures were accessed by ANOVA, or nonparametric Kruskal–Wallis test, and post-hoc tests were employed, respectively, TukeyHSD or Dunn’s. Results The structures of the male urethral sphincter complex were clearly depicted by fiber tractography using optimized acquisition and fiber tracking parameters. The use of eddy currents and subject motion corrections did not yield statistically significant differences on the reported DTI metrics. Regional differences were found between all structures studied among patients, suggesting a quantitative differentiation on the structures based on DTI metrics. Conclusions The current study demonstrates the technical feasibility of the proposed methodology, to study in a preoperative setting the male urethral sphincter complex of prostate cancer patients candidates for surgical treatment. These findings may play a role on a more accurate prediction of the RS-RARP post-surgical urinary continence recovery rate.

scholarly journals A Combined Technology to Protect the Anatomic Integrity of Distal Urethral Sphincter Complex in Radical Prostatectomy Improves Early Urinary Continence Recovery Without Sacrifice of Oncological Outcomes

2021 ◽  
Vol 11 ◽  
Author(s):  
Ao Liu ◽  
Yi Gao ◽  
Hai Huang ◽  
Xiaoqun Yang ◽  
Wenhao Lin ◽  
...  
Keyword(s):  
Radical Prostatectomy ◽  
Learning Curves ◽  
Urinary Continence ◽  
Positive Surgical Margin ◽  
Reconstruction Technique ◽  
Urethral Sphincter ◽  
Endopelvic Fascia ◽  
Significant Difference ◽  
Sphincter Complex ◽  
Combined Technique

PurposeOur primary aim was to present a combined technique to protect the anatomic integrity of distal urethral sphincter complex (DUSC) during minimally invasive radical prostatectomy (RP) and discuss its impact on urinary continence (UC) recovery. The second aim was to define the learning curve of the combined technique.MethodsWe conducted a non-randomized retrospective study. There were 314 consecutive patients who received RP by the same urologist surgeon with more than 2,000 prior cases in Shanghai Ruijin Hospital between March 2017 and April 2020. Included in this study were 263 patients with clinical T1–T2 stage. We modified a combined RP (Comb-RP) technique including endopelvic fascia no-incising technique, dorsal venous complex (DVC) no-ligation technique, intrafascial dissection technique, and anterior reconstruction technique so as to preserve the anatomic integrity of DUSC. The patients were assigned to two groups: a Comb-RP group and a conventional RP (Conv-RP) group. Continence rates were assessed every 3 months after removal of the catheter. UC was defined as 0 pad per day. Peri-operative variables of the patient including operation time, estimated blood lost (EBL), positive surgical margin (PSM), and postoperative complications were also collected. Scatter-graphs of learning curves were drawn using locally weighted scatterplot smoothing (LOWESS).ResultsRP was accomplished smoothly in all 263 cases. The pad-free UC rates in Conv-RP group and Comb-RP group were 17.3 vs. 27.8% (P = 0.048) at the removal of the catheter, 35.8 vs. 50.0% (P = 0.027) at 1 month, 60.5 vs. 76.1% (P = 0.012) at 3 months, 87.7 vs. 96.5% (P = 0.022) at 6 months, and 94.7 vs. 97.7% (P = 0.343) at 12 months. Kaplan–Meier analysis showed significantly higher and faster continence recovery in the Comb-RP group (mean 4.9 vs. 2.6 months, Log Rank P = 0.001). There was no significant difference in PSM rate between the Comb-RP and Conv-RP group (31.1 vs. 31.2%, P =0.986). The learning curves of peri-operative variables, oncological and functional outcomes achieved the lowest point or plateau at the 20th–60th cases.ConclusionsThe anatomic integrity and intact pelvic floor interplay of DUSC is important for its function. Our combined technique was a safe and feasible technique for improving early UC in RP with no significantly increased PSM rate and no significant difference in long-term UC.

scholarly journals Exploration of male urethral sphincter complex using diffusion tensor imaging (DTI)-based fiber-tracking

2018 ◽  
Vol 48 (4) ◽  
pp. 1002-1011 ◽  
Author(s):  
Shantanu Sinha ◽  
Usha Sinha ◽  
Vadim Malis ◽  
Valmik Bhargava ◽  
Kyoko Sakamoto ◽  
...  
Keyword(s):  
Diffusion Tensor Imaging ◽  
Diffusion Tensor ◽  
Fiber Tracking ◽  
Urethral Sphincter ◽  
Sphincter Complex ◽  
Diffusion Tensor Imaging Dti

scholarly journals Radical prostatectomy outcomes in renal transplant recipients: a retrospective case series of Thai patients

BMC Urology ◽  
2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Kun Sirisopana ◽  
Pocharapong Jenjitranant ◽  
Premsant Sangkum ◽  
Kittinut Kijvikai ◽  
Suthep Pacharatakul ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Radical Prostatectomy ◽  
Renal Transplant ◽  
Operative Time ◽  
Case Series ◽  
Urinary Continence ◽  
Renal Transplant Recipients ◽  
Transplant Recipients ◽  
Estimated Blood Loss ◽  
The Mean

Abstract Background The incidence of prostate cancer in renal transplant recipients (RTR) is similar to the general population. Radical prostatectomy (RP) is the standard of care in the management of clinically localized cancer, but is considered complicated due to the presence of adhesions, and the location of transplanted ureter/kidney. To date, a few case series or studies on RP in RTR have been published, especially in Asian patients. This study aimed to evaluate the efficacy and safety and report the experience with RP on RTR. Methods We retrospectively reviewed data of 1270 patients who underwent RP from January 2008 to March 2020, of which 5 patients were RTR. All available baseline characteristics, perioperative and postoperative data (operative time, estimated blood loss (EBL), complications, length of hospital stay, complication), pathological stage, Gleason score, surgical margin status, and pre/postoperative creatinine were reviewed. Results Of the 5 RTR who underwent RPs (1 open radical prostatectomy (ORP), 1 laparoscopic radical prostatectomy (LRP), 2 robotic-assisted laparoscopic radical prostatectomies (RALRP), and 1 Retzius-sparing RALRP (RS-RALRP)) prostatectomy, the mean age (± SD) was 70 (± 5.62) years. In LRP and RALRP cases, the standard ports were moved slightly medially to prevent graft injury. The mean operative time ranged from 190 to 365 min. The longest operative time and highest EBL (630 ml) was the ORP case due to severe adhesion in Retzius space. For LRP and RALRP cases, the operative times seemed comparable and had EBL of ≤ 300 ml. All RPs were successful without any major intra-operative complication. There was no significant change in graft function. The restorations of urinary continence were within 1 month in RS-RALRP, approximately 6 months in RALRP, and about 1 year in ORP and LRP. Three patients with positive surgical margins had prostate-specific antigen (PSA) persistence at the first follow-up and 1 had later PSA recurrence. Two patients with negative margins were free from biochemical recurrence at 47 and 3 months after their RP. Conclusions Our series suggested that all RP techniques are safe and feasible mode of treatment for localized prostate cancer in RTR.

scholarly journals Clinical significance and risk factors of urethrovesical anastomotic urinary leakage following robot-assisted radical prostatectomy: a multi-institutional study

BMC Urology ◽  
2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Shigenori Kakutani ◽  
Yuta Takeshima ◽  
Yuta Yamada ◽  
Tetsuya Fujimura ◽  
Shoichi Nagamoto ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Risk Factors ◽  
Radical Prostatectomy ◽  
Clinical Significance ◽  
Final Analysis ◽  
Urinary Continence ◽  
Robot Assisted ◽  
Urinary Leakage ◽  
Postoperative Continence ◽  
The University

Abstract Background There has been a limited number of reports on the significance and risk factors of urethrovesical anastomotic urinary leakage (AUL) following robot-assisted radical prostatectomy (RARP). We aimed to analyze the clinical significance of AUL and evaluated its risk factors. Methods We conducted a multi-institutional study to review patients with prostate cancer undergoing RARP in three centers (The University of Tokyo Hospital, Mitsui Memorial Hospital, and Chiba Tokushukai Hospital). “Positive AUL” was defined as urinary extravasation at the anastomosis detected by post-operative cystogram and was further categorized into minor or major AUL. Univariate and multivariate analyses were performed to identify predictors of AUL. Postoperative continence rates and time to achieve continence were also analyzed. Results A total of 942 patients underwent RARP for prostate cancer in 3 centers. Of these patients, a cystogram after the RARP procedure was not performed in 26 patients leaving 916 patients for the final analysis. AUL was observed in 56 patients (6.1%); 34 patients (3.7%) with minor AUL and 22 patients (2.4%) with major AUL. Patients with major AUL exhibited a significantly longer time to achieve continence than those without major AUL. Multivariate analysis demonstrated that longer console time (≥ 184 min) was significantly associated with overall AUL, and higher body mass index (≥ 25 g/kg2) was a significant predictor of both major and overall AUL. Conclusions The presence of major AUL was associated with the achievement of urinary continence, suggesting clinical relevance of its diagnosis by postoperative cystogram. A selective cystogram has been proposed for high-risk cases. Furthermore, identification of the risk factors of AUL will lead to optimal application.

scholarly journals Evaluation of Peripheral Zone Prostate Cancer Aggressiveness Using the Ratio of Diffusion Tensor Imaging Measures

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Aslihan Onay ◽  
Gokhan Ertas ◽  
Metin Vural ◽  
Omer Acar ◽  
Yesim Saglican ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Diffusion Tensor Imaging ◽  
Diffusion Tensor ◽  
Mean Diffusivity ◽  
Peripheral Zone ◽  
Strong Correlations ◽  
Noncancerous Tissue ◽  
Statistical Measures ◽  
Cancer Aggressiveness ◽  
Better Than

Purpose. To evaluate the aggressiveness of peripheral zone prostate cancer by correlating the Gleason score (GS) with the ratio of the diffusion tensor imaging (DTI) measures. Materials and Methods. Forty-two peripheral zone prostate tumors were imaged using DTI. Regions of interest focusing on the center of tumor foci and noncancerous tissue were used to extract statistical measures of mean diffusivity (MD) and fractional anisotroy (FA). Measure ratio was calculated by dividing tumor measure by noncancerous tissue measure. Results. Strong correlations are observable between GS and MD measures while weak correlations are present between GS and FA measures. Minimum tumor MD (MDmin) and the ratio of minimum MD (rMDmin) show the same highest correlation with GS (both ρ=-0.73). Between GS ≤ 7 (3 + 4) and GS ≥ 7 (4 + 3), differences are significant for all MD measures but for some FA measures. MD measures perform better than FA measures in discriminating GS ≥ 7 (4 + 3). Conclusion. Ratios of MD measures can be used in evaluation of peripheral zone prostate cancer aggressiveness; however tumor MD measures alone perform similarly.

scholarly journals Urinary Continence Outcomes after Puboprostatic Ligament Preserving Open Retropubic Radical Prostatectomy at a Sub-Saharan Hospital

2014 ◽  
Vol 2014 ◽  
pp. 1-4
Author(s):  
S. Kaggwa ◽  
M. Galukande
Keyword(s):  
Prostate Cancer ◽  
Radical Prostatectomy ◽  
High Rate ◽  
Localized Prostate Cancer ◽  
Urinary Continence ◽  
Resource Limited ◽  
Retrospective Clinical Study ◽  
Retropubic Radical Prostatectomy ◽  
Sub Saharan ◽  
High Level

Background. Open retropubic radical prostatectomy is a commonly performed procedure for clinically localized prostate cancer. The demand for high level functional outcomes after therapy is increasing especially for young age patients; in this regard refinements in the surgical technique have been made. There is limited data to show the success of some of these refinements in resource limited settings. Methods. A retrospective clinical study was performed over a 2-year period at Mengo Hospital, Urology Unit. Men with clinically localized prostate cancer and who consented to the procedure were eligible and were recruited. Consequently excluded were those that turned out to have advanced disease and those with severe comorbidities. Patients were followed up for 3 months after surgery. Data was entered using SPSS version 17 and analyzed. Results. A total of 24 men with clinically localized prostate cancer underwent open retropubic puboprostatic ligament preserving radical prostatectomy technique. Mean age was 66, range 54–75 years. Outcome. Two patients had stress incontinence and three were incontinent at 3 months. The urinary continence recovery rate was 19/24 (79%) at 3 months. Conclusion. Preservation of the puboprostatic ligament in open retropubic radical prostatectomy was associated with rapid and a high rate of return to urinary continence among men with clinically localized disease.

scholarly journals Does urethral length affect continence outcomes following robot assisted laparoscopic radical prostatectomy (RALP)?

2019 ◽  
Author(s):  
Diwei Lin ◽  
Michael E O'Callaghan ◽  
Rowan David ◽  
Andrew Fuller ◽  
Richard Wells ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Radical Prostatectomy ◽  
Short Form ◽  
High Volume ◽  
Urinary Continence ◽  
Resonance Imaging ◽  
Robot Assisted ◽  
Mri Scans ◽  
Magnetic Resonance Imaging Mri ◽  
Radiotherapy Treatment

Abstract Purpose Post-operative urinary incontinence is a significant concern for patients choosing to undergo a radical prostatectomy (RP) for treatment of prostate cancer. The aim of our study was to determine the effect of pre-operative MUL on 12 month continence outcomes in men having robot-assisted laparoscopic prostatectomy (RALP).Methods We use the South Australian Prostate Cancer Clinical Outcomes Collaborative (SA-PCCOC) database, to identify 602 patients who had undergone RALP by a high volume surgeon. Only patients who received an assessment and education by a specialist pelvic floor physiotherapist, had completed EPIC questionnaires before treatment and did not have radiotherapy treatment within 12 months of surgery were included. MUL measurements were taken from pre-operative magnetic resonance imaging (MRI) scans. The short-form version of the Expanded Prostate Cancer Index Composite (EPIC-26) was used to measure continence outcomes. Continence was defined as 100/100 in the EPIC-26 Urinary Continence domain score.Results The observed median MUL in this study was 14.6mm. There was no association between MUL and baseline continence. MUL was associated with continence at 12 months post RALP (OR 1.13, 95% CI 1.03-1.21, p=0.0098). In men who were continent before surgery, MUL was associated with return to continence at 12 months after RALP (OR 1.15, 1.05-1.28, p=0.006). MUL was also associated with change in continence after surgery (β=1.22, p=0.002).Conclusions MUL had no effect on baseline continence but had a positive and significant association with continence outcomes over 12 months post RALP.

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