Three-Dimensional Renal Parenchymal Volume as a Surrogate for Renal Function Estimation in Obstructed Kidneys Undergoing Surgical Repair.

Purpose: To investigate the relationship between renal parenchymal volume (RPV) and renal function in obstructed kidneys using a novel three-dimensional (3D) volume-rendering technique.

Materials And Methods: Forty-seven consecutive patients who underwent pyeloplasty, ureteroureterostomy, or ureteroneocystostomy at a single institution between 2007 and 2013 were reviewed. Patients with preoperative CT scan and split differential functional (SDF) assessment by diuretic renography were included.

Nonlinear logistic regression model for outcomes after endourologic procedures: a novel predictor.

The purpose of this study was to design a thorough and practical nonlinear logistic regression model that can be used for outcome prediction after various forms of endourologic intervention. Input variables and outcome data from 382 renal units endourologically treated at a single institution were used to build and cross-validate an independently designed nonlinear logistic regression model. Model outcomes were stone-free status and need for a secondary procedure.

Small-bore catheter drainage of pleural injury after percutaneous nephrolithotomy: feasibility and outcome from a single large institution series.

Background And Purpose: A well-known complication of percutaneous nephrolithotomy (PCNL) is pleural injury. Pneumothorax and hydrothorax sustained during PCNL may necessitate the placement of a chest tube. Current literature describes placement of standard chest tubes as well as small-bore catheters for management of hydrothorax sustained during PCNL.

Update on the evaluation of repeated stone formers.

Office management of stone disease is an important component of a urologist's practice. Evaluation should include analysis of stone composition, 24-hour urine studies, identification of modifiable risk factors, and targeted dietary, lifestyle, and/or medical therapy. A sizeable portion of investigated etiologies and risk factors for stone disease have centered on the complex interplay between obesity, diabetes, and other disease states that comprise the metabolic syndrome.

Bilateral urinary calculi with discordant stone composition.

Objectives: To describe a cohort of bilateral stone formers with significantly different compositions between renal units.

Methods: Patients treated for bilateral nephrolithiasis over a 4-year period (2007-2010) were identified. Stones were categorized by dominant (≥50%) mineralogical component.

Contemporary volume-outcome relationships for percutaneous nephrolithotomy: results from the Nationwide Inpatient Sample.

Introduction/objective: We sought to examine the contemporary relationship between case volume and outcome for percutaneous nephrolithotomy (PCNL) using a publically available administrative database.

Methods: A weighted sample of 7785 patients was obtained from the 2010 Healthcare Cost and Utilization Project (HCUP) Nationwide Inpatient Sample (NIS). ICD-9-CM diagnostic codes were used to identify patients with urolithiasis (592.

Five-year experience with metallic stents for chronic ureteral obstruction.

Purpose: We present 5 years of outcome data on metallic ureteral stents in a cohort of patients treated for chronic ureteral obstruction.

Materials And Methods: We retrospectively identified and analyzed the records of all patients in whom a Resonance® Metallic Ureteral Stent was placed between early 2007 and late 2011 at our institution. We performed a descriptive analysis of key outcomes, including the failure and death rates, and stenting duration, defined as the time from initial stent placement to last stent failure or patient death.

Mini-percutaneous nephrolithotomy with ureteral access sheath in a transplanted kidney: case report and literature review.

This is the case of a 69-year-old woman with a history of right iliac fossa living-related kidney transplant that developed acute renal failure due to an obstructing stone in the proximal transplant ureter. She was successfully treated with mini-percutaneous nephrolithotomy wherein a 14-Fr tract was created with serial dilation and a 14-Fr ureteral access sheath was used for access. A flexible ureteroscope with holmium laser and a helical wire basket were used to fragment and extract the stone, respectively.

Comparison of complication rates for unilateral and bilateral percutaneous nephrolithotomy (PCNL) using a modified Clavien grading system.

Objective: To compare complication rates of unilateral vs bilateral percutaneous nephrolithotomy (PCNL) using the modified Clavien grading system.

Patients And Methods: Single-institution retrospective chart review. Identified patients who had synchronous bilateral PCNL (B-PCNL) over an 11-year period (2000-2011).

Metabolic syndrome and urinary stone composition: what factors matter most?

Objective: To determine which metabolic syndrome (MetS) factors lead to differences in stone composition in a multivariate analysis.

Methods: We retrospectively reviewed medical charts of patients who had a kidney stone removed over a 5-year period (2006-2011). MetS factors (obesity [body mass index {BMI} >30], diabetes mellitus [DM], hypertension [HTN], and dyslipidemia [DLD]) were tallied in each patient.

Effect of renal function on urinary mineral excretion and stone composition.

Objective: To determine the effect of renal function on urinary mineral stone excretion and composition of kidney stones in patients undergoing urologic intervention for nephrolithiasis.

Methods: We performed a retrospective analysis of 158 patients with 193 kidney stones who underwent endourologic intervention for nephrolithiasis. The patients were grouped by the estimated glomerular filtration rate (eGFR).