Correlation of Relative Value Units With Surgical Complexity and Physician Workload in Urology.

OBJECTIVE: To define the relationship between urology relative value units (RVUs) and measures of surgical complexity and physician workload. Secondary objectives include: (1) identifying procedures with outlying RVU values for their measures of surgical complexity and workload; and (2) calculating projected RVU values for these procedures. METHODS: We obtained surgical case data for 71 urology current procedural terminology (CPT) codes from the 2017 American College of Surgeons National Surgical Quality Improvement Program (NSQIP) database. Pearson correlation coefficients were calculated to measure the association between mean total work RVU and operative time, length of hospital stay, serious adverse events, readmissions, and mortality. We developed a multivariable regression model to predict mean total work RVU from these measures. Studentized residuals were used to identify outlying CPT codes for both bivariable and multivariable regression models, and empirically derived RVU values from complexity and work effort metrics were estimated. RESULTS: We analyzed 71 urology CPT codes encompassing 55,068 cases. RVUs correlated well with median length of hospital stay (R = 0.81), median operative time (R = 0.92), serious adverse events (R = 0.83), and readmissions (R = 0.74). RVUs were poorly correlated with mortality (R = 0.34). Outlying procedures identified using the multivariable model were retroperitoneal lymph node dissection (projected +21.09 RVUs), laparoscopic ureteroneocystotomy (projected -12.34 RVUs), and cystectomy with bilateral pelvic lymphadenectomy (projected +9.37 RVUs). CONCLUSION: Urology work RVUs correlate more with operative time than other measures of surgical complexity and physician workload. There exist several significant outlying procedures for various work measures. Incorporating objective work data may improve RVU assignments in the future.

Laparoscopic intra-abdominal patent processus vaginalis ligation in pediatric urology practice.

INTRODUCTION AND OBJECTIVE: Inguinal hernias and communicating hydroceles from a patent processus vaginalis (PPV) are common problems in children. This study provides a detailed description of the laparoscopic intra-abdominal patent processus vaginalis ligation (LIPPL) procedure along with its results in pediatric urology patients. METHODS: Prospectively collected data were captured from children (<18 years) who underwent LIPPL from 2012 to 2014. Demographics as well as postoperative characteristics were reviewed and descriptively analyzed. LIPPL is performed using a 5-mm camera through the umbilicus. A loop of polypropylene suture is passed through a spinal needle percutaneously on one side of the internal ring. The needle is reinserted on the opposite side and the tail of the suture is fed through the original loop such that a purse-string is created around the peritoneum of the internal ring above the spermatic vessels and the vas; the suture is tied extracorporeally. RESULTS: 142 patients (3 female) were evaluated with 197 PPV sites repaired using LIPPL at median 24 (1-216) months of age. Median operating time was 35 (20-91) and 43 (27-85) minutes for unilateral and bilateral repairs, respectively. There were no intraoperative complications. During the 14 (1-34) months from surgery, there were no hernia recurrences, one surgical site infection, seven patients with residual small non-communicating hydroceles, and one patient who developed a suture granuloma. CONCLUSIONS: LIPPL is a safe and effective technique with minimal rate of hernia recurrence and few complications. LIPPL allows for easy repair of all sizes of PPV, with patients receiving the benefits of minimally invasive surgery including the ability to evaluate the contralateral inguinal ring.

The NLRP3 Inflammasome Mediates Inflammation Produced by Bladder Outlet Obstruction.

PURPOSE: While bladder outlet obstruction is well established to elicit an inflammatory reaction in the bladder that leads to overactive bladder and fibrosis, little is known about the mechanism by which this is initiated. NLRs (NOD-like receptors) and the structures that they form (inflammasomes) have been identified as sensors of cellular damage, including pressure induced damage, and triggers of inflammation. Recently we identified these structures in the urothelium. In this study we assessed the role of the NLRP3 (NACHT, LRR and PYD domains-containing protein 3) inflammasome in bladder dysfunction resulting from bladder outlet obstruction. MATERIALS AND METHODS: Bladder outlet obstruction was created in female rats by inserting a 1 mm outer diameter transurethral catheter, tying a silk ligature around the urethra and removing the catheter. Untreated and sham operated rats served as controls. Rats with bladder outlet obstruction were given vehicle (10% ethanol) or 10 mg/kg glyburide (a NLRP3 inhibitor) orally daily for 12 days. Inflammasome activity, bladder hypertrophy, inflammation and bladder function (urodynamics) were assessed. RESULTS: Bladder outlet obstruction increased urothelial inflammasome activity, bladder hypertrophy and inflammation, and decreased voided volume. Glyburide blocked inflammasome activation, reduced hypertrophy and prevented inflammation. The decrease in voided volume was also attenuated by glyburide mechanistically as an increase in detrusor contraction duration and voiding period. CONCLUSION: Results suggest the importance of the NLRP3 inflammasome in the induction of inflammation and bladder dysfunction secondary to bladder outlet obstruction. Arresting these processes with NLRP3 inhibitors may prove useful to treat the symptoms that they produce.