Best Stent Length Predicted by Simple CT Measurement Rather than Patient Height.

INTRODUCTION AND OBJECTIVES: Ureteral stent length is important, as stents that are too long might worsen symptoms and too short are at higher risk of migration. The purpose of this study was to determine if patient or radiologic parameters correlate with directly measured ureteral length and if directly measured ureteral length predicts proper stent positioning. METHODS: During stent placement, ureteral length (ureteropelvic junction to ureterovesical junction distance) was directly measured by endoscopically viewing a ureteral catheter (with 1-cm marking) emanating from the ureteral orifice. A 22, 24, or 26 cm stent was chosen to be closest to the measured ureteral length. For ureters >26 cm, a 26 cm stent was chosen. Ends of an "ideally positioned" stent were fully curled in the renal pelvis and bladder, without crossing the bladder midline. Rates of ideal stent position were compared between patients with matching stent and ureteral lengths and those with stent lengths differing by ≥1 cm (mismatched). The measured ureteral length was correlated with patient height, L1-L5 height, and length measured on CT. RESULTS: Fifty-nine ureters from 57 patients were included. Height was reasonably correlated with L1-L5 height (Spearman correlation coefficient [rho] = 0.79), although both were poorly correlated with directly measured ureteral length (rho = 0.18 for height and 0.32 for lumbar height). Ureteral lengths measured on CT correlated well with direct measurement (rho = 0.63 for axial cuts and rho = 0.64 for coronal cuts). Matched stent length was associated with higher rates of ideal stent position than mismatched (100% vs 70.9%, p = 0.006). CONCLUSIONS: CT measurements, rather than height, correlate well with measured length and could be used to choose the appropriate stent length. Stents matching directly measured ureteral lengths are associated with high rates of ideal stent position.

Baseline urologic surgical skills among medical students: Differentiating trainees.

INTRODUCTION: Urology training programs seek to identify ideal candidates with the potential to become competent urologic surgeons. It is unclear whether innate technical ability has a role in this selection process. We aimed to determine whether there are any innate differences in baseline urologic technical skills among medical students. METHODS: Second-year medical students from the University of Toronto were recruited for this study and stratified into surgical and non-surgical cohorts based on their reported career aspirations. After a pre-test questionnaire, subjects were tested on several urologic surgical skills: laparoscopy, cystoscopy and robotic surgery. Statistical analysis was performed using chi-squared test, student t-tests and Spearman's correlation where appropriate. RESULTS: A total of 29 students participated in the study and no significant baseline differences were found between cohorts with respect to demographics and prior surgical experience. For laparoscopic skills, the surgical cohort outperformed the non-surgical cohort on several exercises: Lap Beans Missed (4.9 vs. 9.3, p < 0.01), Lap Bean Rating (3.8 vs. 3.1, p = 0.01), Lap Rings Error (0.2 vs. 1.22, p < 0.01), Lap Rings Rating (3.9 vs. 2.9, p < 0.01) and LapSim Grasping Score (64.3 vs. 46.4, p = 0.01). For cystoscopic skills, there were no significant differences between cohorts on any of the performance metrics. The surgical cohort also outperformed the non-surgical cohort on all measured robotic surgery performance metrics: Task Time (50.6 vs. 76.3, p < 0.01), Task Errors (0.2 vs. 3.1, p < 0.01), and Task Score (89.5 vs. 72.6, p < 0.01). DISCUSSION: Objective innate technical ability in urological skills, particularly laparoscopy and robotics, may differ between early trainees interested in a surgical career compared to those interested in a non-surgical career. Further studies are required to illicit what impact such differences have on future performance and competence.

Robotic surgery basic skills training: Evaluation of a pilot multidisciplinary simulation-based curriculum.

PURPOSE: Simulation-based training improves clinical skills, while minimizing the impact of the educational process on patient care. We present results of a pilot multidisciplinary, simulation-based robotic surgery basic skills training curriculum (BSTC) for robotic novices. METHODS: A 4-week, simulation-based, robotic surgery BSTC was offered to the Departments of Surgery and Obstetrics & Gynecology (ObGyn) at the University of Toronto. The course consisted of various instructional strategies: didactic lecture, self-directed online-training modules, introductory hands-on training with the da Vinci robot (dVR) (Intuitive Surgical Inc., Sunnyvale, CA), and dedicated training on the da Vinci Skills Simulator (Intuitive Surgical Inc., Sunnyvale, CA) (dVSS). A third of trainees participated in competency-based dVSS training, all others engaged in traditional time-based training. Pre- and post-course skill testing was conducted on the dVR using 2 standardized skill tasks: ring transfer (RT) and needle passing (NP). Retention of skills was assessed at 5 months post-BSTC. RESULTS: A total of 37 participants completed training. The mean task completion time and number of errors improved significantly post-course on both RT (180.6 vs. 107.4 sec, p < 0.01 and 3.5 vs. 1.3 sec, p < 0.01, respectively) and NP (197.1 vs. 154.1 sec, p < 0.01 and 4.5 vs. 1.8 sec, p = 0.04, respectively) tasks. No significant difference in performance was seen between specialties. Competency-based training was associated with significantly better post-course performance. The dVSS demonstrated excellent face validity. CONCLUSIONS: The implementation of a pilot multidisciplinary, simulation-based robotic surgery BSTC revealed significantly improved basic robotic skills among novice trainees, regardless of specialty or level of training. Competency-based training was associated with significantly better acquisition of basic robotic skills.

Multidisciplinary validation study of the da Vinci Skills Simulator: educational tool and assessment device.

Despite the increased dexterity and precision of robotic surgery, like any new surgical technology it is still associated with a learning curve that can impact patient outcomes. The use of surgical simulators outside of the operating room, in a low-stakes environment, has been shown to shorten such learning curves. We present a multidisciplinary validation study of a robotic surgery simulator, the da Vinci(®) Skills Simulator (dVSS). Trainees and attending faculty from the University of Toronto, Departments of Surgery and Obstetrics and Gynecology (ObGyn), were recruited to participate in this validation study. All participants completed seven different exercises on the dVSS (Camera Targeting 1, Peg Board 1, Peg Board 2, Ring Walk 2, Match Board 1, Thread the Rings, Suture Sponge 1) and, using the da Vinci S Robot (dVR), completed two standardized skill tasks (Ring Transfer, Needle Passing). Participants were categorized as novice robotic surgeon (NRS) and experienced robotic surgeon (ERS) based on the number of robotic cases performed. Statistical analysis was conducted using independent T test and non-parametric Spearman's correlation. A total of 53 participants were included in the study: 27 urology, 13 ObGyn, and 13 thoracic surgery (Table 1). Most participants (89 %) either had no prior console experience or had performed <10 robotic cases, while one (2 %) had performed 10-20 cases and five (9 %) had performed ≥20 robotic surgeries. The dVSS demonstrated excellent face and content validity and 97 and 86 % of participants agreed that it was useful for residency training and post-graduate training, respectively. The dVSS also demonstrated construct validity, with NRS performing significantly worse than ERS on most exercises with respect to overall score, time to completion, economy of motion, and errors (Table 2). Excellent concurrent validity was also demonstrated as dVSS scores for most exercises correlated with performance of the two standardized skill tasks using the dVR (Table 3). This multidisciplinary validation study of the dVSS provides excellent face, content, construct, and concurrent validity evidence, which supports its integrated use in a comprehensive robotic surgery training program, both as an educational tool and potentially as an assessment device. Table 1 dVSS validation study participant demographic information Survey question Response Number (%) Gender Male 36 (67.9) Female 17 (32.1) Handedness Right-hand dominant 45 (84.9) Left-hand dominant 4 (7.5) Ambidextrous 3 (5.7) Level of training Junior Resident (R1-R3) 17 (32.1) Senior Resident (R4-R5) 12 (22.6) Fellow 16 (30.2) Staff Surgeon 8 (15.1) Specialty Urology 27 (50.9) ObGyn 13 (24.5) Thoracics 13 (24.5) Previous MIS experience (laparoscopic or thoracoscopic) None/minimal 17 (32.1) Moderate 11 (20.8) Significant 18 (34.0) Fellowship-trained in MIS 4 (7.5) Previous robotic surgery experience None 32 (60.4) Yes 21 (39.6) If yes, number of operative cases as surgical assistant 0 cases 33 (62.3) <10 cases 9 (17.0) 10-20 cases 3 (5.7) >20 cases 8 (9.4) If yes, number of operative cases at robotic console for at least 30 min 0 cases 41 (77.4) <10 cases 6 (11.3) 10-20 cases 1 (1.9) >20 cases 5 (9.4) MIS minimally invasive surgery Table 2 dVSS construct validity evidence dVSS exercise All subjects' overall score (%, mean ± SD) Novice robotic surgeon overall score (%, mean ± SD) Expert robotic surgeon overall score (%, mean ± SD) p value Camera Targeting 1 69.943 ± 21.7489 67.170 ± 21.5258 91.667 ± 4.2269 0.008 Peg Board 1 78.596 ± 11.9824 76.913 ± 11.6616 91.500 ± 3.8341 0.004 Match Board 1 69.880 ± 17.7691 67.864 ± 17.9075 84.667 ± 6.1860 0.028 Thread the Rings 74.152 ± 16.4289 71.825 ± 16.2605 89.667 ± 5.8878 0.011 Suture Sponge 1 74.787 ± 14.3086 73.171 ± 14.5067 85.833 ± 5.6716 0.042 Ring Walk 2 75.098 ± 20.0861 73.333 ± 20.1099 88.333 ± 15.4100 0.086 Peg Board 2 84.308 ± 11.7633 83.283 ± 12.0861 92.167 ± 3.6009 0.082 Table 3 dVSS concurrent validity evidence NP time NP errors RT time RT errors Camera Targeting 1 overall score 0.471 (0.001) 0.083 (0.575) 0.291 (0.045) 0.061 (0.685) Peg Board 1 overall score 0.486 (0.001) 0.141 (0.344) 0.325 (0.026) 0.088 (0.555) Match Board 1 overall score 0.543 (<0.001) 0.096 (0.530) 0.295 (0.050) 0.215 (0.162) Thread the Rings overall score 0.432 (0.005) 0.231 (0.147) 0.533 (<0.001) 0.163 (0.310) Suture Sponge 1 overall score 0.592 (<0.001) 0.105 (0.509) 0.437 (0.004) 0.015 (0.925) Ring Walk 2 overall score 0.454 (0.002) 0.179 (0.234) 0.399 (0.006) 0.022 (0.884) Peg Board 2 overall score 0.675 (<0.001) 0.058 (0.696) 0.073 (0.626) 0.045 (0.762) Subjects' overall score for each dVSS exercise is correlated with the time to complete (time) and number of errors (errors) for the Needle Passing (NP) and Ring Transfer (RT) tasks performed using the dVR. Data is expressed as Pearson correlation coefficient (p value).

Percutaneous nephrolithotripsy in patients with urinary diversions: a case-control comparison of perioperative outcomes.

PURPOSE: To compare the operative techniques and perioperative outcomes of patients with urinary intestinal diversions undergoing percutaneous nephrolithotripsy (PCNL), to a control cohort of patients without diversions. PATIENTS AND METHODS: The medical records of all patients who were treated with PCNL from 1990 to 2009 were retrospectively reviewed. Each urinary diversion patient's first PCNL was age-matched with four controls who were undergoing PCNL. The perioperative outcomes were compared between the diversion and control cohorts. RESULTS: Twenty-five patients with a urinary diversion who had undergone 33 PCNLs were identified. The mean age was 49.3 (8-85) years for the diversion group and 48.9 (4-84) for the control group. Urinary tract infection (64% vs 15% patients, P<0.0001), neurologic disease (64% vs 2%, P<0.0001), previous procedure for the same calculus (24% vs 4%, P=0.0004), urinary tract abnormalities (56% vs 14%, P<0.0001), solitary kidney (20% vs 3%, P=0.0081), and struvite stones (80% vs 12.5%, P=0.0006) were more commonly observed in the diversion group. Percutaneous access gained by a radiologist (40% vs 0%, P<0.0001), second-look nephroscopy (36% vs 16%, P=0.0466), and an increase in the frequency of fever or sepsis (8% vs 0%, P=0.0387) were identified more frequently in the diversion group. CONCLUSIONS: Patients with upper tract calculi and urinary diversions are challenging to the endourologist because of anatomic factors that can make percutaneous access more difficult; ultrasonography-guided access can be helpful in this setting. Patients with urinary diversions can be treated as safely and effectively by PCNL as nondiverted patients.

A rare case of classic testicular seminoma in an 86-year-old shows similar proliferation rate as in younger men.

We present a rare case of classic seminoma in an 86-year-old man. Combined mitotic count, the presence or absence of intravascular invasion, and the expression of PCNA, Ki67, and p53 were compared between this octogenarian and the tumors of four randomly selected standard younger men. These histologic features were chosen to compare the potential biologic activity of these tumors. The phenotype of classic seminomas in octogenarians seems to be the same as in younger men, and treatment paradigms should remain unchanged.

Nonpalpable scarring of the penile septum as a cause of erectile dysfunction: an atypical form of Peyronie's disease.

INTRODUCTION: Men with nonpalpable isolated septal scars (ISS) identified with color duplex ultrasonography (CDU) comprise a group of previously unrecognized patients with wide-ranging sexual concerns. AIM: We aim to identify the clinical characteristics of patients presenting with this atypical form of Peyronie's disease characterized by the absence of palpable deformity. MATERIALS AND METHODS: Of 482 consecutive patients who presented to a tertiary care erectile dysfunction (ED) clinic and underwent CDU after satisfying inclusion criteria, 27 (5.6%) men with nonpalpable ISS and no dorsal or ventral plaque were identified. MAIN OUTCOME MEASURES: International Index of Erectile Function (IIEF), CDU, and clinical characteristics. RESULTS: The median age of the men with nonpalpable ISS was 49 years. The length of time from onset of symptoms to presentation was 22 months, and the pretreatment IIEF score was 14. The remaining 455 men who underwent CDU were of similar age (48 years) but had a markedly lower IIEF score of 9.5 (statistical median). ISS patients presented with decreased penile rigidity (20), penile shortening (13), chronic pain with erection (13; mean 33 months), and the inability to maintain an erection (7). Fourteen men had failed phosphodiesterase-5 inhibitor therapy, and four reported unsatisfactory results. Management options included retrial with oral agents, intracavernous pharmacotherapy, verapamil injections, and surgery. CONCLUSIONS: The clinician should be suspicious for nonpalpable ISS in men with sexual concerns who present with decreased penile rigidity, length loss, and chronic pain with erection. Our findings support the use of CDU for this patient group, particularly when previous treatment has failed, because men with ISS had a greater likelihood of having no palpable deformity or curvature and ongoing penile pain.