Intrapleural t-PA therapy for loculated pleural effusion arising after percutaneous nephrolithotripsy: a case report.

Pleural complications from upper pole percutaneous renal access for lithotripsy occur infrequently and are managed minimally invasively with urinary diversion (double-J stent or nephrostomy) and chest tube placement. However, sometimes the pleural effusion may evolve into an empyema that requires open or thoracoscopic decortication. We present a novel approach in which topical fibrinolytic therapy was used to successfully resolve a symptomatic, nonresolving (despite antibiotic treatment and a properly positioned chest tube), loculated pleural effusion arising post percutaneous nephrolithotripsy.

Forced versus minimal intravenous hydration in the management of acute renal colic: a randomized trial.

Background And Purpose: The management of acute renal colic is a problem commonly encountered by both urologists and emergency medicine physicians. The classic approach to managing uncomplicated acute renal colic involves hydration, along with imaging and pain control. Previous studies have suggested that hydration has a significant impact on patient comfort, as well as spontaneous stone passage.

Citrate and vitamin E blunt the shock wave-induced free radical surge in an in vitro cell culture model.

Free radical formation plays a major role in shock wave lithotripsy induced renal damage. Moreover, previous studies suggest that free radicals may also promote de novo calcium oxalate crystallization of previously damaged urothelium. Citrate is a known inhibitor of renal stone formation and has also been used as a free radical scavenger.

Anastomotic contracture and incontinence after radical prostatectomy: a graded approach to management.

Purpose: We present a heterogeneous group of men presenting with varying degrees of anastomotic contracture (AC) and associated stress urinary incontinence (SUI) following radical prostatectomy. It is particularly important that AC should be resolved before artificial urinary sphincter (AUS) implantation, because instrumentation through the AUS can risk erosion.

Materials And Methods: The records of 54 consecutive men who were referred for the management of AC and associated SUI were reviewed.

Management of nephropleural fistula after supracostal percutaneous nephrolithotomy.

Objectives: Access to complex urinary tract pathology may require supracostal access placing patients at risk for intrathoracic complications. Our objective was to retrospectively review our experience with percutaneous renal surgery with a particular emphasis on identifying the incidence of nephropleural fistula and management of this unusual complication.

Methods: The records of 375 consecutive patients who underwent percutaneous renal surgery between 1993 and 2001 were reviewed.

Bilateral renal calculi: assessment of staged v synchronous percutaneous nephrolithotomy.

Background And Purpose: Percutaneous stone removal has replaced open renal surgery and has become the treatment of choice for large or complex renal calculi. However, patients with large bilateral stone burdens still present a challenge. Simultaneous bilateral percutaneous nephrolithotomy (PCNL) has been demonstrated to be a well-tolerated, safe, cost-effective, and expeditious treatment.

Perineal repair of pelvic fracture urethral distraction defects: experience in 120 patients during the last 10 years.

Purpose: We report the long-term success of a 1-stage perineal anastomotic repair in patients with pelvic fracture urethral distraction defects.

Materials And Methods: A retrospective analysis of 120 patients undergoing perineal bulboprostatic anastomotic repair of pelvic fracture urethral distraction defect in a single stage using our progressive approach between May 1991 and May 2001 was performed. Patients with posterior urethral stricture due to other etiologies, or those who underwent substitution urethroplasty or abdominoperineal repair were excluded from this review.

Determining the incidence of horseshoe kidney from radiographic data at a single institution.

Purpose: An estimated 150,000 children are born with birth defects each year. One of the most frequent genitourinary abnormalities is horseshoe kidney (HSK). The incidence of HSK in the population is estimated to be 1/400 to 1,600 births based on autopsy data from the 1940s and 1950s.

In vitro analysis of stone fragmentation ability of the FREDDY laser.

Background And Purpose: The Frequency-Doubled Double-Pulse Nd:Yag) (FREDDY) laser (World of Medicine, Berlin Germany) is a short-pulsed, double-frequency solid-state laser with wavelengths of 532 and 1064 nm. This low-power, low-cost laser was developed for intracorporeal lithotripsy. We designed an experimental set-up to test its fragmentation efficiency at different energy and frequency settings.

Medical management of stone disease.

Purpose Of Review: Dietary manipulation still remains one of the most important strategies for therapy. A growing body of evidence, however, suggests that severe calcium restriction is inappropriate in patients with recurrent nephrolithiasis. Dietary recommendations based on recent evidence and the role of bacteria in the pathogenesis of calcium nephrolithiasis are discussed.

Assessment of stricture formation with the ureteral access sheath.

Objectives: To analyze the long-term incidence of ureteral stricture formation in a series of patients in whom a new-generation ureteral access sheath was used. A new generation of ureteral access sheaths has been developed to facilitate ureteroscopic procedures. However, some have questioned their safety and whether the device might cause significant ureteral trauma.

Shock wave lithotripsy causes ipsilateral renal injury remote from the focal point: the role of regional vasoconstriction.

Purpose: Shock wave lithotripsy induced renal damage can occur as a result of multiple mechanisms, including small vessel injury and free radical production. Previous studies have demonstrated that shock wave lithotripsy exerts a regional change in renal hemodynamics, resulting in a global reduction in the glomerular filtration rate and renal plasma blood flow. We determined if biochemical evidence of cellular damage could be identified in ipsilateral locations remote from the shock wave site or in the contralateral kidney, suggesting regional or systemic alterations in renal function.

Ureteral access sheath facilitates inspection of incision of ureteropelvic junction.

Purpose: The Acucise (Applied Medical, Rancho Santa Margarita, California) electrocautery balloon is a highly successful device used in managing congenital and secondary ureteropelvic junction obstruction. Correct orientation of the cutting wire is essential during insertion of the Acucise catheter to avoid injury to crossing vessels. Moreover, confirmation of the lateral ureteropelvic junction incision is typically verified by fluoroscopic identification of extravasated contrast material.

Durability of the medical management of cystinuria.

Purpose: Cystinuria is an autosomal recessive disorder of dibasic amino acid transport in the kidney that leads to an abundance of cystine in the urine. This molecule is poorly soluble in urine and it is prone to crystallization and stone formation at concentrations above 300 mg./l.

Techniques to maximize flexible ureteroscope longevity.

Objectives: To assess methods to improve the longevity and durability of flexible ureteroscopes by using the ureteral access sheath, 200-microm holmium laser fiber, and nitinol baskets or graspers during routine ureteroscopic procedures. Despite adequate advances in fiberoptics and endoscope design, the decreased size of currently available flexible ureteroscopes makes damage inevitable after repeated use. However, new auxiliary tools may be able to enhance ureteroscope durability.

Hypertonic saline-augmented radiofrequency ablation of the VX-2 tumor implanted in the rabbit kidney: a short-term survival pilot study.

Objectives: The increased incidental detection of small (less than 4 cm) renal tumors has stimulated investigations of minimally invasive therapies. Radiofrequency energy is a relatively new and evolving technology that has been used for a variety of experimental and clinical applications. We evaluate the efficacy of hypertonic interstitial saline-augmented radiofrequency therapy to ablate a malignant VX-2 tumor implanted in a rabbit kidney, as measured by the completeness of tumor destruction and progression to metastasis.

Routine postoperative imaging is important after ureteroscopic stone manipulation.

Purpose: Improved fiber optics and advanced intracorporeal lithotripsy devices have significantly decreased the incidence of complications during ureteroscopic procedures. Despite recent reports suggesting that radiographic imaging may not be necessary in all individuals after routine ureteroscopy silent obstruction may develop in some, ultimately resulting in renal damage. We determined the incidence of postoperative silent obstruction at our institution and assessed the need for routine functional radiographic studies after ureteroscopy.

Routine ureteral stenting is not necessary after ureteroscopy and ureteropyeloscopy: a randomized trial.

Background And Purpose: Retrospective studies have suggested that routine stenting can be avoided following ureteroscopy. We prospectively analyzed the need for routine ureteral stent placement in patients undergoing ureteroscopic procedures.

Patients And Methods: Fifty-five consecutive patients (60 renal units) were randomized into either a stent or a no-stent group following ureteroscopy with either a 7.

Computed tomography urography, three-dimensional computed tomography and virtual endoscopy.

Spiral computed tomography technology allows an entire body region to be imaged as a continuous volume of computed tomography data. The acquisition of genitourinary images can be performed at different intervals after intravenous contrast injection in order to characterize the renal vasculature, the renal parenchyma or the collecting system. Computed tomography scanning as contrast is excreted into the collecting system is termed a 'computed tomography urogram'.

In vivo assessment of free radical activity during shock wave lithotripsy using a microdialysis system: the renoprotective action of allopurinol.

Purpose: Shock wave lithotripsy is believed to cause renal damage directly through cellular injury from high energy shock waves and indirectly through vascular injury and resultant ischemia, which gives rise to oxygen free radical compounds. The transient and volatile nature of free radicals and derived products makes their detection difficult. Moreover, certain medications may provide a protective effect against shock wave lithotripsy induced renal parenchymal injury.