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INTRODUCTION Bladder stones have historically been associated with urinary stasis secondary to bladder outlet obstruction (BOO). Recent studies indicate that the role of BOO in bladder stone formation is minor. We evaluate the role of urinary lithogenic factors in bladder stone formation by comparing the compositions of bladder stones and kidney stones in patients with multi-site urinary calculi.We identified patients who were treated for concomitant bladder stones and kidney stones between 2008-2019, and had both stone compositions available. Patients with bladder stone size10 mm, urinary foreign bodies, encrusted stents or tumors were excluded. Data regarding urinary symptoms, residual volumes, stone composition and 24-hours urine data were collected.We identified 40 males with a median age of 72 years (IQR 6-14), median residual volume of 76 mL (IQR 41-200), and a median prostate volume of 52 mL (IQR 32-102). Bladder outlet procedures were performed concomitantly with cystolitholapaxy in 21 (53%) patients. The most common bladder stone and kidney stone compositions were CaOx (47.5% and 65%), uric acid (32.5% and 22.5%), calcium phosphate (15% and 10%), and struvite (5% and 2.5%), respectively. Bladder stone and kidney stone compositions were identical in 70% of patients. Bladder stone composition was predictive of kidney stone composition, regardless of the PVR, bladder stone size, or whether an outlet procedure was performed.We found a high concordance between bladder stone and kidney stone composition, suggesting that metabolic abnormalities have a significant role in bladder stone formation. Bladder stone composition can be used to guide surgical and medical treatment for kidney stones in metabolically active stone patients.

We compared the effect of standard office-based consultation (OC) and phone correspondences (PC) on dietary 24-h urinary parameters.The medical record of all patients treated between January and April 2019 was reviewed. Only patients who had at least two consecutive 24-h urine collections were included. Linear and logistic regressions were used to investigate the difference between the changes in urinary parameters after OC and PC.Forty-three patients underwent 135 OC and 34 PC. Twenty-one received OC and PC, and 22 had only OC. Gender, age, the distance to stone clinic, the number of previous stone episodes, and baseline urinary parameters were similar between the groups. Patients who had both OC and PC had a longer follow-up time (51.7 vs 18.5 months, p 0.0001) as well as more consults (Median 5.4 vs 2.5, p 0.0001). Six (27%) patients who had only OC, and eight (38%) patients who had both OC and PC, experienced stone recurrence during the study period (p = 0.52). Following PC, there was a greater improvement in urine volume in comparison to OC (0.27 l/day vs -0.06 l/day, p = 0.034), but there was no difference in the absolute values after the consults between the groups.In established stone-clinic patients, PC was associated with a better adherence with follow-up. The 24-h urine results were similar between PC and OC. PC may be an effective alternative for urinary stone management.

Studies indicate that with a safety wire in the ureter, an increased amount of force is necessary to advance ureteral access sheaths up to the proximal ureter. Theoretically, the compression of the ureter with the wire could lead to an increase in number and severity of ureteral injuries secondary to placement of a sheath. This prospective study aims to evaluate if there is a correlation between the use of a safety wire and ureteral injury from sheath placement by evaluating the location of the wire in relation to the injury after ureteroscopy.Fifty-nine consecutive patients underwent ureteroscopy for upper tract urinary stone disease. A 12/14 French ureteral access sheath was used with a safety wire in place. Ureteroscopy during withdrawal of the sheath was video recorded and reviewed by a blinded observer. Visible ureteral injuries were graded per the Traxer ureteral injury scale and the proximity of the wire to the injury was noted.Thirty-one of 59 patients (52.4%) had a ureteral injury secondary to access sheath placement. Eighteen (30.5%) injuries were low-grade, 13 (22.0%) were high-grade (grade 2 and 3) and there were no grade 4 injuries. A total of 10 (32.3%) injuries occurred on the same side as the wire while 67.7% were on the contralateral side of the ureter. Of the injuries that occurred on the same side as the wire, 80% were grade 1 injuries and 2 (20%) were grade 3. Statistical analysis did not show a significant relationship between high/low injury grade and side of injury (p value = 0.088). This suggests that there is no association of between the safety wire and development of high injury.There is no association between the location of the safety wire and ureteral injury if injury occurs during the placement of a ureteral access sheath. This suggests that the use of a safety wire does not add significant morbidity to the procedure.

The Moses technology of the holmium laser has been shown to decrease retropulsion in the ureter and procedural time in kidney stones during laser lithotripsy. Theoretically, these improvements could lead to cost savings for the patient.All patients with total laser energy data recorded who underwent ureteroscopy with laser lithotripsy by a single surgeon at a tertiary care center were included. Total lasing time was calculated from the total laser energy. Sub-analyses were done on stone size and stone composition. The procedure time using Moses technology was projected to be approximately 35% less than procedure time without the Moses technology based on prior in vitro studies. The projected cost savings was then utilized to predict cost-effectiveness of the Moses technology.Forty patients underwent ureteroscopy with laser lithotripsy. Mean stones size was 10.2 mm and mean lasing time was 3.02 minutes. Linear regression showed a positive association between stone size and laser time, p = 0.01. There was no significant correlation between stone composition or stone Hounsfield units and lasing time. On cost analyses, for stones of all sizes the Moses system has a price differential of an increase in $292.36 when compared to the standard Holmium TracTip system. Specifically for stones larger than 10 mm, the price differential is an increase in $253.16 for the Moses technology.The decrease in lasing time achieved by the Moses system does not translate into sufficient cost savings to off-set the higher cost of the laser fiber and software.

To systemically measure the impact of trainees' participation on the perioperative and functional outcomes after holmium laser enucleation of the prostate (HoLEP).Benign prostatic hyperplasia patients who underwent HoLEP at our department between January 2007 and January 2013 were classified based on trainee's level. Perioperative outcomes and complications were collected. Functional outcomes were assessed using the Sexual Health Inventory for Men (SHIM), International Prostate Symptom Score (IPSS), and International Continence Society-Short Form (ICSmaleSF) questionnaires. Voiding and incontinence domains of ICSmaleSF were assessed separately. Patients were divided into group 1 if no trainee participated in the operation, group 2 if a senior trainee performed the operation, and group 3 if a junior trainee participated in the operation. The patient's baseline characteristics, complications, and perioperative outcomes were compared.There were no differences in the baseline characteristics. There were significant differences in overall operative and enucleation time (p = 0.0186, p = 0.0047, respectively) with shorter times noticed with more experienced operators. There were no differences in resected tissue weight, hemoglobin change, and transfusion rates. Postoperatively, all patients had a similar length of stay and catheterization. Complications (graded by Clavien grading system) were not different. All patients were followed up at regular intervals starting at 6 weeks, 3 months , 6 months, 1 year, and every year after that and there were no differences in flow rates or post void residual volumes at any time point. There were no differences in SHIM, IPSS, and ICSmale voiding scale among the groups. However, ICSmale continence scale was significantly different where the highest score seen in group 2.Trainee participation in HoLEP in a controlled training environment does not compromise the safety of the procedure.