Active clinical trials for "Kidney Calculi"

Nephrolithiasis is the third most common disease of the urinary tract. As minimally invasive technologies develop, shock wave lithotripsy (SWL), retrograde intrarenal surgery (RIRS), and percutaneous nephrolithotomy (PCNL) are different surgeries to treat renal stones. Aim of the Study is to compare results, safety and outcome of Ultra mini PCNL versus stented extracorporeal shock wave lithotripsy (SWL) for the management of renal calculi from 10 - 20 mm. Patients were randomized to either Ultra-Mini-Percutaneous nephrolithotomy group or stented SWL group via the closed envelope method. Patient data was collected preoperatively, immediately postoperatively and 2 and 4 weeks postoperatively to assess operative time, hospital stay, complications regarding fever, hematuria and need for blood transfusion, residual stones and need for retreatment.

The extracorporeal shock wave lithotripsy (ESWL) is the treatment of choice for most stones in any of their locations. It is about breaking the stone without surgically intervening on the patient and getting him to expel the fragments himself. It is thought that additional treatments to the ESWL could improve the success rate of ESWL for less favorable stones. The components of our authorized food supplement have shown an inhibitory effect in vitro on the growth of calcium oxalate monohydrate crystals, even in hightly supersaturared solutions. Also these components show an inhibitory effect on the growth of calcium phosphate crystals. To sum up, it reduces the formation, inhibits the growth and promotes the dissolution of calcium oxalate and calcium phosphate kidney stones. This is the reason why this experimental study aims to modify the size limit of the stones in the ESWL with adjuvant food supplement.

Shock wave lithotripsy (SWL) is recommended for kidney stones < 20 mm. However, the stone clearance of lower pole calculi after SWL is limited, thus leading to an extended indication for mini-percutaneous nephrolithotripsy (PCNL) even for stones between 10 and 20 mm in many centers. This trend is further promoted by introduction of super-mini PCNL (SMP), which is postulated to be less invasive compared to mini-PCNL due to the miniaturized instruments. However, this issue remains controversial. On the other hand, improvements in endoscopy technology have made retrograde stone removal more attractive. This has led to an increasing use of RIRS as a primary treatment although it is recommended only as 2nd-line option by current guidelines. However, the treatment of symptomatic lower pole calculi is a challenge for RIRS because of lower clearance rates. The purpose of this study is to evaluate the efficacy and safety of SMP and RIRS for the treatment for symptomatic lower pole calculi renal calculi measuring 10-20 mm.

To evaluate the effectiveness of RIRS (retrograde intrarenal surgery) and ESWL (extracorporeal shockwaves lithotripsy) in the treatment of renal stone ranging form 6 to 20 mm size.

The investigators will examine in two studies whether citric acid or potassium citrate can reduce calcium phosphate saturation in urine of Calcium Phosphate stone formers.

Reusable flexible ureteroscopes are widely used to treat various upper urinary tract diseases including urinary stones. However, they require a long turnover time between procedures because of the sterilization process. Moreover, repeated use of a scope ultimately deteriorates its image quality which leads to a high maintenance cost in the long-term. A disposable digital flexible ureteroscope was released in the United States in January 2016, offering an improved image resolution, new scope performance characteristics with every case, and no need for sterilization and repair. Preliminary data from our center has demonstrated that disposable scopes shorten operative time by 25% compared to reusable fiberoptic scope and are associated with a 2/3 reduction in procedural complication rate. Therefore, treatment with disposable scopes may be more effective for patients and facilitate cost management within the hospital. Here, we propose a three-armed, prospective randomized study, comparing treatment outcomes between disposable digital, reusable fiberoptic, and reusable digital flexible ureteroscopes.

The primary objective of this study would be to determine whether utilization of this technology improves adherence to recommended increases in hydration for stone forming patients with low urine volume relative to standard techniques such as education and reading materials. We hypothesize that the addition and utilization of the smart water bottle to standard recommendations will lead to measurable increases 24 hour urine output for affected patients.

The investigators have developed an extremely low dose renal computed tomography (CT) protocol that on preliminary testing has an effective dose in the range of a single view abdominal radiograph. The investigators plan to test this exam in patients with known or suspected urolithiasis undergoing clinically indicated CT.

Evaluation of a nonopioid recovery pathway after percutaneous nephrolithotomy is a pragmatic pilot study that will apply the knowledge and experience gained with development of an outpatient opioid reduction protocol to percutaneous nephrolithotomy (PCNL). We have previously demonstrated that outpatient ureteroscopy and stent placement without postoperative opioid prescriptions is possible in the vast majority of patients. The success of this is dependent upon a multimodal approach to the patient's experience of undergoing endoscopic kidney stone surgery (ureteroscopy) and focuses on the preoperative, perioperative, and postoperative stages of intervention. Our hypothesis is that a novel nonopioid pathway after PCNL is both feasible and safe and will reduce postoperative prescriptions for opioids without impacting clinical outcomes, patient satisfaction or outpatient resources.

This study consists of having subjects, those with calcium oxalate kidney stones as well as healthy controls, consume low and oxalate enriched diets to investigate the role of oxalate on crystalluria (the presence of crystals in urine), immunity and infection.