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Dive into the research topics where Marcelino E. Rivera is active.

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Featured researches published by Marcelino E. Rivera.


Urology | 2015

Long-term Outcomes Following Artificial Urinary Sphincter Placement: An Analysis of 1082 Cases at Mayo Clinic

Brian J. Linder; Marcelino E. Rivera; Matthew J. Ziegelmann; Daniel S. Elliott

OBJECTIVE To evaluate long-term device outcomes following primary artificial urinary sphincter (AUS) implantation. MATERIALS AND METHODS We identified 1802 male patients with stress urinary incontinence that underwent AUS placement from 1983 to 2011. Of these, 1082 (60%) were involving primary implantations and comprise the study cohort. Multiple clinical and surgical variables were evaluated for potential association with treatment failure, defined as any secondary surgery. Patient follow-up was obtained through office examination, operative report, and written or telephone correspondence. RESULTS Patients undergoing AUS implantation had a median age of 71 years (interquartile range 66-76) and median follow-up of 4.1 years (interquartile range 0.8-7.7). Overall, 338 of 1082 patients (31.2%) underwent secondary surgery, including 89 for device infection and/or erosion, 131 for device malfunction, 89 for urethral atrophy, and 29 for pump malposition or tubing complications. No patient-related risk factors were independently associated with an increased risk of secondary surgery on multivariable analysis. Secondary surgery-free survival was 90% at 1 year, 74% at 5 years, 57% at 10 years, and 41% at 15 years. CONCLUSION Primary AUS implantation is associated with acceptable long-term outcomes. Recognition of long-term success is important for preoperative patient counseling.


European Urology | 2015

Efficiency, satisfaction, and costs for remote video visits following radical prostatectomy: a randomized controlled trial.

Boyd R. Viers; Deborah J. Lightner; Marcelino E. Rivera; Matthew K. Tollefson; Stephen A. Boorjian; R. Jeffrey Karnes; R. Houston Thompson; Daniel A. O’Neil; Rachel L. Hamilton; Matthew R. Gardner; Mary Bundrick; Sarah M. Jenkins; Sandhya Pruthi; Igor Frank; Matthew T. Gettman

BACKGROUND Telemedicine in an ambulatory surgical population remains incompletely evaluated. OBJECTIVE To investigate patient encounters in the outpatient setting using video visit (VV) technology compared to traditional office visits (OVs). DESIGN, SETTING, AND PARTICIPANTS From June 2013 to March 2014, 55 prescreened men with a history of prostate cancer were prospectively randomized. VVs, with the patient at home or at work, were included in the outpatient clinic calendar of urologists. INTERVENTION Remote VV versus traditional OV. OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS An equivalence analysis was used to assess the primary outcome, visit efficiency as measured by time studies. Secondary outcomes were patient/provider satisfaction and costs. RESULTS AND LIMITATIONS There were 28 VVs and 27 OVs. VVs were equivalent in efficiency to relative to OVs, as measured by patient-provider face time (mean 14.5 vs 14.3min; p=0.96), patient wait time (18.4 vs 13.0min; p=0.20), and total time devoted to care (17.9 vs 17.8min; p=0.97). There were no significant differences in patient perception of visit confidentiality, efficiency, education quality, or overall satisfaction. VVs incurred lower costs, including distance traveled (median 0 vs 95 miles), travel time (0 vs 95min), missed work (0 vs 1 d), and money spent on travel (


The Journal of Urology | 2014

Tamsulosin and Spontaneous Passage of Ureteral Stones in Children: A Multi-Institutional Cohort Study

Gregory E. Tasian; Nicholas G. Cost; Candace F. Granberg; Jose E. Pulido; Marcelino E. Rivera; Zeyad Schwen; Marion Schulte; Janelle A. Fox

0 vs


The Journal of Urology | 2015

Perioperative Complications following Artificial Urinary Sphincter Placement.

Brian J. Linder; Joshua T. Piotrowski; Matthew J. Ziegelmann; Marcelino E. Rivera; Laureano J. Rangel; Daniel S. Elliott

48; all p<0.0001). There was a high level of urologist satisfaction for both VVs (88%) and OVs (90%). The major limitation was sample size. CONCLUSIONS VV in the ambulatory postprostatectomy setting may have a future role in health care delivery models. We found equivalent efficiency, similar satisfaction, but significantly reduced patient costs for VV compared to OV. Further prospective analyses are warranted. PATIENT SUMMARY Among men with surgically treated prostate cancer, we evaluated the utility of remote video visits compared to office visits for outpatient consultation with a urologist. Video visits were associated with equivalent efficiency, similar satisfaction, and significantly lower patient costs when compared to office visits. We conclude that video visits may have a future role in health care delivery models.


Journal of Laparoendoscopic & Advanced Surgical Techniques | 2011

Robotic-Assisted Ureteral Reimplantation with Boari Flap and Psoas Hitch: A Single-Institution Experience

Christopher Yang; Loren Jones; Marcelino E. Rivera; Graham T. VerLee; Leslie A. Deane

PURPOSE Tamsulosin is associated with increased passage of ureteral stones in adults but its effectiveness in children is uncertain. We determined the association between tamsulosin and the spontaneous passage of ureteral stones in children. MATERIALS AND METHODS We performed a multi-institutional retrospective cohort study of patients 18 years or younger who presented between 2007 and 2012 with ureteral stones up to 10 mm and who were treated with tamsulosin or oral analgesics alone. The outcome was spontaneous stone passage, defined as radiographic clearance and/or patient report of passage. Subjects prescribed tamsulosin were matched with subjects prescribed analgesics alone, using nearest neighbor propensity score matching to adjust for treatment selection. Conditional logistic regression models were used to estimate the association between tamsulosin and spontaneous passage of ureteral stones, adjusting for stone size and location. RESULTS Of 449 children with ureteral stones 334 were eligible for inclusion, and complete data were available for 274 patients from 4 institutions (99 receiving tamsulosin, 175 receiving analgesics alone). Following case matching, there were no differences in age, gender, weight, height, stone size or stone location between the 99 subjects prescribed tamsulosin and the 99 propensity score matched subjects prescribed analgesics alone. In the tamsulosin cohort 55% of ureteral stones passed, compared to 44% in the analgesics alone cohort (p=0.03). In multivariate analysis adjusting for stone size and location tamsulosin was associated with spontaneous passage of ureteral stones (OR 3.31, 95% CI 1.49-7.34). CONCLUSIONS The odds of spontaneous passage of ureteral stones were greater in children prescribed tamsulosin vs analgesics alone.


The Journal of Urology | 2016

Long-Term Quality of Life and Functional Outcomes among Primary and Secondary Artificial Urinary Sphincter Implantations in Men with Stress Urinary Incontinence

Boyd R. Viers; Brian J. Linder; Marcelino E. Rivera; Laureano J. Rangel; Matthew J. Ziegelmann; Daniel S. Elliott

PURPOSE We evaluated perioperative complications in patients undergoing primary artificial urinary sphincter placement and the potential impact of these complications on device outcomes. MATERIALS AND METHODS During the 2-year period from 2012 to 2014 we retrospectively evaluated the outcomes of 197 consecutive artificial urinary sphincter implantation procedures performed at our institution for post-prostatectomy incontinence. Of these cases 100 that were primary implantations comprise the study cohort. Perioperative complications, defined as those occurring within 6 weeks postoperatively, were classified by the Clavien-Dindo classification. After office evaluation at 6 weeks patients were followed for symptoms. Patient followup was obtained through office examination and telephone correspondence. RESULTS Patients undergoing primary artificial urinary sphincter implantation had a median age of 71.5 years (IQR 66, 76). The overall rate of any complication (Clavien I-V) within 6 weeks of surgery was 35%, including urinary retention in 31% of cases, cellulitis in 1%, device infection in 2% and urethral erosion in 2%. No significant differences in pertinent clinical comorbidities such as age (p = 0.69), hypertension (p = 0.95), coronary artery disease (p = 0.57), diabetes mellitus (p = 0.17), body mass index (p = 0.47), prior pelvic radiation therapy (p = 0.45), prior urethral sling placement (p = 0.91) or transcorporeal urethral cuff placement (p = 0.22) were found between patients with and without complications. Median followup was similar between those with and without postoperative urinary retention (p = 0.14). Postoperative urinary retention was associated with adverse 6-month device survival (76% vs 89%, p = 0.04). CONCLUSIONS The most common complication of artificial urinary sphincter placement is urinary retention. Serious adverse events following artificial urinary sphincter placement are rare. Postoperative urinary retention is associated with adverse short-term device survival rates.


Current Opinion in Urology | 2016

Innovations in robotic surgery.

Matthew T. Gettman; Marcelino E. Rivera

Robotic-assisted ureteral reimplantations were performed on 3 patients at a single institution, 2 with Boari flap and psoas hitch and 1 with psoas hitch alone. These were for urothelial carcinoma of the distal ureter, ureteral obstruction caused by distal ureteral endometriosis, and ureteral transaction during gynecologic surgery. We used intraoperative ureteroscopy to confirm tumor margins as well as a simple technique for retrograde placement of transvesicle wire prior to ureteral anastomosis. Surgery and recovery were uneventful. This illustrates that robotic-assisted ureteral reimplantation with Boari flap and psoas hitch is a safe and viable approach for ureterovesicle reconstruction.


Journal of Endourology | 2014

Holmium Laser Enucleation of the Prostate and Perioperative Diagnosis of Prostate Cancer: An Outcomes Analysis

Marcelino E. Rivera; Igor Frank; Boyd R. Viers; Laureano J. Rangel; Amy E. Krambeck

PURPOSE There remains a paucity of data regarding subjective and functional outcomes after artificial urinary sphincter implantation. Therefore, we evaluated long-term differences in quality of life after primary and secondary artificial urinary sphincter surgery. MATERIALS AND METHODS Men were invited to participate in a mail-in survey assessing artificial urinary sphincter status, patient satisfaction and urinary control. Patients with primary (467) and secondary (122) artificial urinary sphincter devices without an event were included in the study. Differences between the cohorts including quality of life (10-point scale, maximum 100) and functional outcomes were evaluated. RESULTS Overall 229 (49%) patients with primary and 49 (40%) with secondary artificial urinary sphincters completed the survey at a median of 8.3 years. Patients with primary and secondary artificial urinary sphincter devices reported similar artificial urinary sphincter quality of life (score 74 vs 74). There were no significant differences in urinary continence outcomes including use of 1 pad or less daily (56% vs 55%), frequency of leakage 1 time or more per day (81% vs 71%) or degree of minimal leakage related bother (64% vs 55%). At less than 5 vs 10 or more years there was a significant reduction in artificial urinary sphincter quality of life (86 vs 73, p=0.007). Urinary continence also declined with time, including perceived urinary control (85% vs 53%, p=0.004), minimal leakage related bother (76% vs 59%, p=0.05) and use of 1 pad or less daily (67% vs 55%, p=0.07). On univariate analysis no clinical variables, including secondary revision, were associated with satisfaction or continence outcomes. CONCLUSIONS We noted a high level of artificial urinary sphincter quality of life, acceptable urinary control and no difference in functional outcomes between men undergoing primary or secondary artificial urinary sphincter surgery. However, the time related decline in satisfaction and continence highlights the need for patient counseling regarding long-term artificial urinary sphincter functional outcomes.


International Journal of Urology | 2016

Outcomes of artificial urinary sphincter placement in octogenarians

Matthew J. Ziegelmann; Brian J. Linder; Marcelino E. Rivera; Boyd R. Viers; Laureano J. Rangel; Daniel S. Elliott

Purpose of review Developments in robotic surgery have continued to advance care throughout the field of urology. The purpose of this review is to evaluate innovations in robotic surgery over the past 18 months. Recent findings The release of the da Vinci Xi system heralded an improvement on the Si system with improved docking, the ability to further manipulate robotic arms without clashing, and an autofocus universal endoscope. Robotic simulation continues to evolve with improvements in simulation training design to include augmented reality in robotic surgical education. Robotic-assisted laparoendoscopic single-site surgery continues to evolve with improvements on technique that allow for tackling previously complex pathologic surgical anatomy including urologic oncology and reconstruction. Last, innovations of new surgical platforms with robotic systems to improve surgeon ergonomics and efficiency in ureteral and renal surgery are being applied in the clinical setting. Summary Urologic surgery continues to be at the forefront of the revolution of robotic surgery with advancements in not only existing technology but also creation of entirely novel surgical systems.


Urology | 2016

Long-term Follow-up of the Virtue Quadratic Male Sling.

Andrew N. McCall; Marcelino E. Rivera; Daniel S. Elliott

OBJECTIVE Our objective is to assess the outcomes of patients with prostate cancer (PCa) diagnoses undergoing holmium laser enucleation of the prostate (HoLEP). METHODS From 2009 to 2012, 450 patients underwent HoLEP at our institution. We performed a retrospective review of these patients to identify those with PCa. RESULTS PCa was diagnosed in 57 (12.7%) HoLEP patients: 11 (19.2%) preoperatively, 43 (75.4%) in the operative specimen, and 3 (5.4%) during follow-up. Mean time to PCa development in the postoperative group was 16 months (9-23). There was no difference in patient characteristics for those diagnosed with PCa at the time of HoLEP or in the postoperative period. There were 5 patients with a Gleason score (GS)>8 and 52 with GS<8 PCa. In the operative group, 39 (91%) elected for active surveillance and 4 (9%) elected to have cancer treatment. In subgroup analysis, men diagnosed with GS>8 intraoperatively or postoperatively had significantly elevated preoperative, postoperative, and percent change prostate-specific antigen (PSA) levels when compared to patients diagnosed GS ≤ 7 (P=0.01, 0.02, and 0.01, respectively). There were no complications, all voided spontaneously, and one patient had persistent incontinence. CONCLUSION HoLEP for the treatment of lower urinary tract symptoms (LUTS) in selectively chosen men with known PCa can safely improve urination. Furthermore, PCa is diagnosed at the time of or post HoLEP in nearly 12% of patients. Those patients with persistently elevated post HoLEP PSA levels or low percent change PSA levels should raise suspicion for high GS PCa. Finally, HoLEP does not preclude active surveillance or treatment for PCa when appropriate.

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Boyd R. Viers

University of Texas Southwestern Medical Center

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