Active clinical trials for "Nephrolithiasis"

The investigators will test the hypothesis that renal uptake of free (i.e. non-esterified) fatty acids (FFa) is increased in iuan. To accomplish this goal the investigators will measure renal FFa uptake FFa uptake in vivo in patients with iuan and matched non-stone forming subjects via single-photon emission computed tomography (SPeCT)/CT imaging. The definitive proof of the hypothesis rests on whether increased renal FFa uptake is demonstrable in humans with iuan.

The overall purpose of this study is to evaluate criterion-related validity of a newly-developed disease-specific instrument to assess the health-related quality of life (HRQOL) of patients who have had kidney stones. Specific aims of this study are: Aim 1. Evaluate the population/external validity (generalizability) of the Wisconsin Stone-QOL by answering the question, "Is the Wisconsin Stone-QOL useful for assessing the HRQOL of patients who form kidney stones from a broad region of North America?" Aim 2. Assess the ability of the Wisconsin Stone-QOL to detect changes within patients related to stone interventions and other disease-specific outcomes by answering the question, "Is the Wisconsin Stone-QOL sensitive to changes in stone-related outcomes within individuals?"

Current practices of the diagnosis of urinary stones gives little information on the probable fragility of stones using shock wave lithotripsy (SWL), and many patients receive more SW's than is necessary to break up their stones. Indeed, some patients are treated with SWL when their stones cannot be fragmented using this technology. The investigators have ample evidence that computed tomography (CT) images of kidney stones can reveal significant internal structure in stones-structure that is likely to be useful in predicting stone fragility-but no one has explored the use of clinical helical CT for this purpose. Also, the investigators do not know the effect that the human body wall and kidney tissue will have on the resolution of kidney stone structure with helical CT.

Prospective, monocentric, single arm, observational PMCF - Study on the Performance and Safety of Double-Shank Titanium Ligation Clip in Urology (Prostatectomy and Nephrectomy)

Identify individuals with greater absorption of oxalate based on increase in urinary oxalate excretion in response to a controlled oxalate-rich test meal.

The study evaluate the damage effect of ESWL and PCNL on kidney tissue by measuring non-coding lnc-RNA profile in urine before and after ESWL and PCNL procedures

Patients who are overweight or obese, diabetic or not, share with those who are suffering from uric stones the same way to remove abnormal acidity of the body in urine, ie a kidney ammoniogenesis default. This results in an overly acidic urine pH which is directly pathogenic in people predisposed to develop uric stones because the precipitation of urate soluble uric acid is accelerated in acid medium. Excess visceral fat, particularly perirenal, this defect may promote formation of renal ammonium. Indeed, the perirenal fat is adjacent to the renal cortex and shares with it a common arterial supply via the plexus Turner. Adipokines and fatty acids of the perirenal fat are predisposed to gain the renal cortex, seat of the ammoniogenesis. In humans the pathogenic role of the perirenal fat is demonstrated in chronic kidney disease and essential hypertension. However, the amount of fat and perirenal that of intra-abdominal fat are positively correlated. Investigators hypothesis is that the perirenal fat also exert a pathogenic role in uric because of anatomical links between kidney stones and greasy environment and because excess fatty acids reaching the renal cortex decreases ammoniogenesis in an animal model metabolic syndrome. For the test, the investigators will compare the amount of fat and perirenal renal ability to form ammonium in patients with uric or calcium lithiasis taking into account the amount of intra-abdominal fat.

The purpose of this study is to evaluate outcomes of an established procedure for treatment of kidney stones that are present within the inner aspect of the kidney. This procedure is called flexible ureteroscopy, which involves placing a small camera through the urethra while anesthetized (asleep), up the ureter (the tube connecting kidney and bladder) and into the kidney to the kidney stone. Then, the stone is broken into tiny fragments using a small laser called a Holmium laser. While this treatment is a well-established option for treatment of these stones, there are several different techniques used to help eliminate them from the kidney. Some urologists treat the stone by a method called "active" extraction whereby the ureteroscope is passed back and forth into the kidney to remove all visible stone fragments. Others use a method called "dusting" whereby the stones are broken into tiny fragments or "dust" with the intention that achieving such a small stone size will allow the stones to pass spontaneously. There has not been a systematic and rigorous comparison of these techniques in terms of treatment outcomes. By collecting information on the success of treatment, the investigators hope to provide benchmark data for future studies of kidney stone treatment and improve the care of all patients who need surgery for their kidney stones. The investigators hypothesize that the stone free rate for renal stone(s) 5-15 mm is around 90% and that the stone clearance rate with be 20% higher in those patients that undergo complete stone fragment extraction versus those that undergo stone dusting (residual fragments < 2mm).

The aim of this study is to compare the effectiveness of Ultrasound-Guided Percutaneous nephrolithotomyin different positions supine, prone positions and flank suspend supine position in renal stones treatment.

This study evaluates the safety and efficacy of the suctioning flexible ureteroscopy(SF-URS) with automatic control of renal pelvic pressure for the treatment of upper urinary calculi using a prospective, randomized design. Half of participants will receive suctioning flexible ureteroscopy with automatic control of renal pelvic pressure, while the other half participants will receive retrograde intrarenal surgery using the classic flexible ureteroscopy.