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Singh V, Sharma K, Choudhary GR, Singh M, Tripathi SS, Bhirud DP, Sandhu AS, Navriya SC. Correlation of urinary continence recovery with various factors after Robot assisted radical prostatectomy. Urologia 2024; 91:141-146. [PMID: 37632409 DOI: 10.1177/03915603231191269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/28/2023]
Abstract
BACKGROUND In addition to ensuring cancer control, prevention of incontinence which significantly impact patients' quality of life, is also an important issue in robot-assisted radical prostatectomy (RARP) operations. In this study, we aimed to find the correlation of urinary continence recovery with various factors after Robot assisted radical prostatectomy. METHODS This study included 162 patients treated with RARP with perioperative data and at least 1 year of follow-up. Also, the preoperative, intraoperative, and postoperative parameters of the patients were analyzed. The continence recovery rate in our study was assessed at 6th week, 3rd month, 6th month, 9th month, and 12th month, post-surgery. Logistic regression analysis evaluated the association between the predictive factors and urinary continence recovery in the early and late stages. RESULTS The majority of patients with prostate cancer present in sixth decade of life. The majority of our patients (56.7%) were categorized as high risk using D'Amico classification. The continence rate in our study at 6th week, 3rd month, 6th month, 9th month, and 12th month were 40.1%, 72.2%, 85.2%, 89.5%, and 91.4%, respectively. No improvement in continence status was observed after 1 year in our study. There was significant correlation of age with continence status at 6th week, 3rd month, and 6th month. The young age is associated with early recovery of continence. At 3 and 9 months, the non-diabetics cases achieved significantly higher continence rates than diabetics (p < 0.05) which shows that diabetes causes delay in attainment of continence. CONCLUSION The young age may be associated with early recovery of continence, but further validation requires large number of cases. We attributed good continence recovery rate to meticulous dissection and preservation of good urethral length.
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Affiliation(s)
- Vikram Singh
- Department of Urology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Kartik Sharma
- Department of Urology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Gautam Ram Choudhary
- Department of Urology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Mahendra Singh
- Department of Urology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | | | - Deepak Prakash Bhirud
- Department of Urology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Arjun Singh Sandhu
- Department of Urology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Shiv Charan Navriya
- Department of Urology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
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2
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Latest Evidence on Post-Prostatectomy Urinary Incontinence. J Clin Med 2023; 12:jcm12031190. [PMID: 36769855 PMCID: PMC9917389 DOI: 10.3390/jcm12031190] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 01/28/2023] [Accepted: 01/29/2023] [Indexed: 02/05/2023] Open
Abstract
A radical prostatectomy is frequently used as the first-line treatment for men with prostate cancer. Persistent urinary incontinence after surgery is one of the most severe adverse events. We report the results of a comprehensive literature search focused on post-prostatectomy urinary incontinence (PPI), performed by a panel of experts on non-neurogenic lower urinary tract symptoms. The data on the prevalence and timing of PPI are very heterogeneous. The etiology of PPI can be multifactorial and mainly dependent on patient characteristics, lower urinary tract function or surgical issues. The medical history with a physical examination, the use of validated questionnaires with a voiding diary and pad tests are determinants in identifying the contributing factors and choosing the right treatment. Lifestyle intervention and urinary containment are the most frequently used strategies for the conservative management of PPI, while antimuscarinics, beta-3 agonists and duloxetine (off-label) are drugs indicated to manage PPI with a concomitant overactive bladder. Surgical therapies for the management of post-prostatectomy SUI include non-adjustable trans-obturator slings in men with mild-to-moderate incontinence and an artificial urinary sphincter in men with moderate-to-severe incontinence.
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Del Giudice F, Huang J, Li S, Sorensen S, Enemchukwu E, Maggi M, Salciccia S, Ferro M, Crocetto F, Pandolfo SD, Autorino R, Krajewski W, Crivellaro S, Cacciamani GE, Bologna E, Asero V, Scornajenghi C, Moschini M, D'Andrea D, Brown DR, Chung BI. Contemporary trends in the surgical management of urinary incontinence after radical prostatectomy in the United States. Prostate Cancer Prostatic Dis 2022:10.1038/s41391-022-00558-x. [PMID: 35729329 DOI: 10.1038/s41391-022-00558-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Revised: 05/16/2022] [Accepted: 05/30/2022] [Indexed: 11/09/2022]
Abstract
PURPOSE To identify trends, costs, and predictors in the use of different surgical procedures for post-radical prostatectomy incontinence (PPI). MATERIALS AND METHODS We identified 21,589 men who were diagnosed with localized prostate cancer (PCa) and treated with radical prostatectomy (RP) from 2003 to 2017. The primary outcome was the incontinence procedure performances. Optum's de-identified Clinformatics® Data Mart Database was queried to define the cohort of interest. The average costs of the different incontinence procedures were obtained and compared. Also, demographic, and clinical predictors of incontinence surgery were evaluated by multivariable regression analysis. RESULTS Of the 21,589 men with localized PCa treated with RP, 740 (3.43%) underwent at least one incontinence procedure during a median of 5 years of follow-up. In total, there were 844 unique incontinence procedures. Male slings were the most common procedure (47.5%), had an intermediate cost compared to the other treatment options, and was the first-choice treatment for the majority of patients (50%). The use of an artificial urinary sphincter (AUS) was the second most common (35.3%), but also was the most expensive treatment and was first-choice-treatment for 32.3% of patients. On multivariable analysis, metabolic syndrome related disorders, adjuvant/salvage radiation therapy as well as a history of neurological comorbidities were independently associated with an increased likelihood of incontinence surgery. CONCLUSIONS The receipt of male slings increased and then subsequently decreased, while AUS utilization was stable, and the use of urethral bulking agents was uncommon. From a cost standpoint, AUS was the most expensive option. Finally, patient's comorbidity history and RP related factors were found to influence the choice for primary or subsequent PPI interventions.
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Affiliation(s)
- Francesco Del Giudice
- Department of Maternal Infant and Urologic Sciences, "Sapienza" University of Rome, Policlinico Umberto I Hospital, Rome, Italy. .,Department of Urology, Stanford University School of Medicine, Stanford, CA, USA.
| | - Jianlin Huang
- Department of Urology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, China
| | - Shufeng Li
- Department of Urology, Stanford University School of Medicine, Stanford, CA, USA
| | - Simon Sorensen
- Department of Urology, Aarhus University, Aarhus, Denmark
| | - Ekene Enemchukwu
- Department of Urology, Stanford University School of Medicine, Stanford, CA, USA
| | - Martina Maggi
- Department of Maternal Infant and Urologic Sciences, "Sapienza" University of Rome, Policlinico Umberto I Hospital, Rome, Italy
| | - Stefano Salciccia
- Department of Maternal Infant and Urologic Sciences, "Sapienza" University of Rome, Policlinico Umberto I Hospital, Rome, Italy
| | - Matteo Ferro
- Division of Urology, European Institute of Oncology (IEO), IRCCS, Milan, Italy
| | - Felice Crocetto
- Department of Neurosciences, Reproductive Sciences and Odontostomatology, University of Naples "Federico II", Naples, Italy
| | - Savio Domenico Pandolfo
- Department of Neurosciences, Reproductive Sciences and Odontostomatology, University of Naples "Federico II", Naples, Italy.,Division of Urology, Department of Surgery, VCU Health, Richmond, VA, USA
| | - Riccardo Autorino
- Division of Urology, Department of Surgery, VCU Health, Richmond, VA, USA
| | - Wojciech Krajewski
- Department of Urology and Oncological Urology, Wrocław Medical University, Wrocław, Poland
| | - Simone Crivellaro
- University of Illinois Hospital & Health Sciences System, Chicago, IL, USA
| | | | - Eugenio Bologna
- Department of Maternal Infant and Urologic Sciences, "Sapienza" University of Rome, Policlinico Umberto I Hospital, Rome, Italy
| | - Vincenzo Asero
- Department of Maternal Infant and Urologic Sciences, "Sapienza" University of Rome, Policlinico Umberto I Hospital, Rome, Italy
| | - Carlo Scornajenghi
- Department of Maternal Infant and Urologic Sciences, "Sapienza" University of Rome, Policlinico Umberto I Hospital, Rome, Italy
| | - Marco Moschini
- Department of Urology, San Raffaele Hospital, IRCCS Milan, Milan, Italy
| | - David D'Andrea
- Department of Urology, Medical University of Vienna, Vienna, Austria
| | | | - Benjamin I Chung
- Department of Urology, Stanford University School of Medicine, Stanford, CA, USA
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Bajpai R, Razdan S, Sanchez MA, Reddy BN, Razdan S. Robotic Assisted Radical Prostatectomy After Prior Transurethral Resection of Prostate: An Analysis of Perioperative, Functional, Pathologic, and Oncological Outcomes. J Endourol 2022; 36:1063-1069. [PMID: 35473411 DOI: 10.1089/end.2021.0875] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND We performed a retrospective comparison of surgical, oncological, and functional outcomes following robotic assisted radical prostatectomy between patients who have undergone prior TURP to TURP naïve patients. METHODS Past robotic prostatectomy hospital data was scrutinized to form two matched groups of patients: those who have undergone prior TURP and TURP naïve patients. The perioperative and pathological data, along with functional and oncological outcomes, over a period of 3 years were compared between groups. RESULTS Compared to TURP-naïve patients, prior TURP patients experienced longer RALP times (p<.001), increased incidence of bladder neck reconstruction (p=0.03), greater blood loss (p= 0.0001), and lesser nerve sparing (p<0.01). Complication rates (p=0.3), positive surgical margin (p=0.4), extracapsular disease (p=0.3), or seminal vesicle invasion (p=0.1) were comparable between groups. Continence (p=0.5) and potency (p=0.1) at 1 year were not different between groups. Biochemical recurrence rates were not different at 3 years (p=0.9). Diabetes slowed recovery of continence in patients with prior TURP compared to TURP naïve patients until 6 months after surgery. CONCLUSION Although prior TURP makes subsequent robotic prostatectomy more technically demanding, it can be safely performed by experienced surgeons without compromising long term functional or oncological outcomes.
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Affiliation(s)
- Rajesh Bajpai
- University of Pittsburgh Medical Center Health System, 6595, Urology, Pittsburgh, Pennsylvania, United States;
| | - Shirin Razdan
- Icahn School of Medicine at Mount Sinai, 5925, 1 Gustave Levy Place, New York, New York, United States, 10029-6574;
| | - Marcos A Sanchez
- Larkin Community Hospital, 20899, Division of Clinical and Translational Research, South Miami, Florida, United States;
| | | | - Sanjay Razdan
- International Robotic Prostatectomy institute, Urology, 3650 NW 82 Avenue, Suite PH 501, Doral, Florida, United States, 33166.,Larkin Community Hospital, 20899, Urology, South Miami, Florida, United States, 33143-4781;
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Qu W, Yu S, Tao J, Dong B, Fan Y, Du H, Deng H, Liu J, Zhang X. Evaluating Incidence, Location, and Predictors of Positive Surgical Margin Among Chinese Men Undergoing Robot-Assisted Radical Prostatectomy. Cancer Control 2021; 28:10732748211055265. [PMID: 34794321 PMCID: PMC8645302 DOI: 10.1177/10732748211055265] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Purpose To evaluate the incidence and locations of positive surgical margin (PSM) among Chinese men undergoing RARP and identify the preoperative predictors for PSM. Methods We retrospectively identified 393 patients who underwent RARP according to inclusion criteria by single surgeon in our hospital. PSM was defined as the presence of cancer adjacent to inked surface of the specimen and categorized into four groups based on locations: apex, posterolateral, base, and multifocal. Logistic regression analysis was performed to identify the predictors of overall and location-specific PSM. Results The overall PSM rate was 133/393 (34%). The PSM rates for pT2, pT3, and pT4 stage were 63/278 (23%), 50/89 (56%), and 20/26 (77%), respectively. The estimated rates for apical, posterolateral, basal, and multifocal PSM were 8%, 4%, 7%, and 14%, respectively. In univariate analysis, overall PSM related to tPSA, f/tPSA, percentage of positive needles, and Gleason score. Multifocal PSM correlated with smoking history, drinking history, tPSA, f/tPSA, percentage of positive needles, and Gleason score. In multivariate analysis, percentage of positive needles reminded the only independent predictor for overall (OR = 10.5, 95% CI: 2.58–44.4) and basal PSM (OR = 24.0, 95% CI: 3.22–179.4). The f/tPSA (OR = 2.59, 95% CI: 2.18–5.71) and percentage of positive needles (OR = 31.0, 95% CI: 3.17–303) were independent risk factors for multifocal PSM. Conclusion The multifocal sites were the most common location of positive surgical margin, followed by apical and basal sites among Chinese patients undergoing RARP. The percentage of positive needles was an independent predictor for overall, basal, and multifocal PSM.
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Affiliation(s)
- Wugong Qu
- Department of Urology, The First Affiliated Hospital of 191599Zhengzhou University, Zhengzhou, China
| | - Shuanbao Yu
- Department of Urology, The First Affiliated Hospital of 191599Zhengzhou University, Zhengzhou, China
| | - Jin Tao
- Department of Urology, The First Affiliated Hospital of 191599Zhengzhou University, Zhengzhou, China
| | - Biao Dong
- Department of Urology, The First Affiliated Hospital of 191599Zhengzhou University, Zhengzhou, China
| | - Yafeng Fan
- Department of Urology, The First Affiliated Hospital of 191599Zhengzhou University, Zhengzhou, China
| | - Haopeng Du
- Department of Urology, The First Affiliated Hospital of 191599Zhengzhou University, Zhengzhou, China
| | - Haotian Deng
- Department of Urology, The First Affiliated Hospital of 191599Zhengzhou University, Zhengzhou, China
| | - Junxiao Liu
- Department of Urology, The First Affiliated Hospital of 191599Zhengzhou University, Zhengzhou, China
| | - Xuepei Zhang
- Department of Urology, The First Affiliated Hospital of 191599Zhengzhou University, Zhengzhou, China
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6
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[Evaluating continence recovery time after robot-assisted radical prostatectomy]. BEIJING DA XUE XUE BAO. YI XUE BAN = JOURNAL OF PEKING UNIVERSITY. HEALTH SCIENCES 2021. [PMID: 34393231 PMCID: PMC8365051 DOI: 10.19723/j.issn.1671-167x.2021.04.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
OBJECTIVE To evaluate urinary continence recovery time and risk factors of urinary continence recovery after robot-assisted laparoscopic radical prostatectomy (RARP). METHODS From January 2019 to January 2021, a consecutive series of patients with localized prostate cancer (cT1-T3, cN0, cM0) were prospectively collected. RARP with total anatomical reconstruction was performed in all the cases by an experienced surgeon. Lymph node dissection was performed if the patient was in high-risk group according to the D'Amico risk classification. The primary endpoint was urinary continence recovery time after catheter removal. Postoperative and pathological variables were analyzed. Continence was rigo-rously analyzed 48 hours, 1 week, 4 weeks, 12 weeks, and 24 weeks after catheter removal. Continence was evaluated by recording diaper pads used per day, and all the patients were instructed to perform the 24-hour pad weight test until full recovery of urinary continence. The patient was defined as continent if no more than one safety pad were needed per day, or no more than 20-gram urine leakage on the 24-hour pad weight test. Time from catheter removal to full recovery of urinary continence was recorded, and risk factors influencing continence recovery time evaluated. RESULTS In total, 166 patients were analyzed. The mean age of the enrolled patients was 66.2 years, and the median prostate specific antigen (PSA) was 8.51 μg/L. A total of 59 patients (35.5%) had bilateral lymphatic dissection, and 28 (16.9%) underwent neurovascular bundle (NVB) preservation surgery. Postoperative pathology results showed that stage pT1 in 1 case (0.6%), stage pT2 in 77 cases (46.4%), stage pT3 in 86 cases (51.8%), and positive margins in 28 patients (16.9%). Among patients who underwent lymph node dissection, lymph node metastasis was found in 7 cases (11.9%). Median continence recovery time was one week. The number of the continent patients at the end of 48 hours, 1 week, 4 weeks, 12 weeks, and 24 weeks were 65 (39.2%), 32 (19.3%), 34 (20.5%), 24 (14.5%), and 9 (5.4%). Two patients remained incontinent 24 weeks after catheter removal. The continence rates after catheter removal at the end of 48 hours, 1 week, 4 weeks, 12 weeks, and 24 weeks were 39.2%, 58.4%, 78.9%, 93.4%, and 98.8%, respectively. Univariate COX analysis revealed that diabetes appeared to influence continence recovery time (OR=1.589, 95%CI: 1.025-2.462, P=0.038). At the end of 48 hours, 4 weeks, 12 weeks, and 24 weeks after catheter removal, the mean OABSS score of the continent group was significantly lower than that of the incontinent group. CONCLUSION RARP showed promising results in the recovery of urinary continence. Diabetes was a risk factor influencing continence recovery time. Bladder overactive symptoms play an important role in the recovery of continence after RARP.
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Kesch C, Heidegger I, Kasivisvanathan V, Kretschmer A, Marra G, Preisser F, Tilki D, Tsaur I, Valerio M, van den Bergh RCN, Fankhauser CD, Zattoni F, Gandaglia G. Radical Prostatectomy: Sequelae in the Course of Time. Front Surg 2021; 8:684088. [PMID: 34124138 PMCID: PMC8193923 DOI: 10.3389/fsurg.2021.684088] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 05/04/2021] [Indexed: 11/13/2022] Open
Abstract
Objective: Radical prostatectomy (RP) is a frequent treatment for men suffering from localized prostate cancer (PCa). Whilst offering a high chance for cure, it does not come without a significant impact on health-related quality of life. Herein we review the common adverse effects RP may have over the course of time. Methods: A collaborative narrative review was performed with the identification of the principal studies on the topic. The search was executed by a relevant term search on PubMed from 2010 to February 2021. Results: Rates of major complications in patients undergoing RP are generally low. The main adverse effects are erectile dysfunction varying from 11 to 87% and urinary incontinence varying from 0 to 87% with a peak in functional decline shortly after surgery, and dependent on definitions. Different less frequent side effects also need to be taken into account. The highest rate of recovery is seen within the first year after RP, but even long-term improvements are possible. Nevertheless, for some men these adverse effects are long lasting and different, less frequent side effects also need to be taken into account. Despite many technical advances over the last two decades no surgical approach can be clearly favored when looking at long-term outcome, as surgical volume and experience as well as individual patient characteristics are still the most influential variables. Conclusions: The frequency of erectile function and urinary continence side effects after RP, and the trajectory of recovery, need to be taken into account when counseling patients about their treatment options for prostate cancer.
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Affiliation(s)
- Claudia Kesch
- Department of Urology, University Hospital Essen, Essen, Germany
| | - Isabel Heidegger
- Department of Urology, Medical University Innsbruck, Innsbruck, Austria
| | - Veeru Kasivisvanathan
- Division of Surgery and Interventional Science, University College London, London, United Kingdom.,Department of Urology, University College London Hospital, London, United Kingdom
| | | | - Giancarlo Marra
- Department of Urology, San Giovanni Battista Hospital, University of Turin, Turin, Italy
| | - Felix Preisser
- Department of Urology, University Hospital Frankfurt, Frankfurt, Germany
| | - Derya Tilki
- Martini-Klinik Prostate Cancer Center, University Hospital Hamburg-Eppendorf, Hamburg, Germany.,Department of Urology, University Hospital Hamburg-Eppendorf, Hamburg, Germany
| | - Igor Tsaur
- Department of Urology and Pediatric Urology, Mainz University Medicine, Mainz, Germany
| | - Massimo Valerio
- Department of Urology, Centre Hospitalier Universitaire Vaudois (CHUV) Lausanne, Lausanne, Switzerland
| | | | | | - Fabio Zattoni
- Urology Unit, Azienda Sanitaria Universitaria Integrata di Udine, Udine, Italy
| | - Giorgio Gandaglia
- Division of Oncology/Unit of Urology, Urological Research Institute, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Ospedale San Raffaele, Milan, Italy
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8
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Urkmez A, Ranasinghe W, Davis JW. Surgical techniques to improve continence recovery after robot-assisted radical prostatectomy. Transl Androl Urol 2020; 9:3036-3048. [PMID: 33457277 PMCID: PMC7807332 DOI: 10.21037/tau.2020.03.36] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Radical prostatectomy directly affects urinary continence dynamics with incontinence being a major factor in patients’ quality of life, social and psychological status. In order to help maintain continence after robot-assisted radical prostatectomy (RARP), a number of surgical techniques have been described. In the present narrative review, we summarize the surgical techniques that have been applied during RARP and their effects on incontinence rates and time to continence recovery.
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Affiliation(s)
- Ahmet Urkmez
- Department of Urology, Division of Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Weranja Ranasinghe
- Department of Urology, Division of Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - John W Davis
- Department of Urology, Division of Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
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9
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Urkmez A, Ranasinghe W, Davis JW. Surgical techniques to improve continence recovery after robot-assisted radical prostatectomy. Transl Androl Urol 2020. [PMID: 33457277 DOI: 10.21037/tau.2020.03.36)] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Radical prostatectomy directly affects urinary continence dynamics with incontinence being a major factor in patients' quality of life, social and psychological status. In order to help maintain continence after robot-assisted radical prostatectomy (RARP), a number of surgical techniques have been described. In the present narrative review, we summarize the surgical techniques that have been applied during RARP and their effects on incontinence rates and time to continence recovery.
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Affiliation(s)
- Ahmet Urkmez
- Department of Urology, Division of Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Weranja Ranasinghe
- Department of Urology, Division of Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - John W Davis
- Department of Urology, Division of Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
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