Active clinical trials for "Urolithiasis"

The investigators objective is to determine if urinary electrolyte abnormalities exist in only one or both kidneys in participants with and without a history of kidney stones. To meet this objective, the investigators are going to take urine samples from each kidney at the time of kidney stone surgery. The samples will then be analyzed for absolute and relative differences in the concentrations of urine electrolytes, such as calcium.

Purpose: The aim of this present study is to investigate the effect of vinegar consumption on 24-hour urinary risk factors associated with calcium oxalate urinary stone formation and blood biochemical parameters. Methods: The investigators will recruit 50 healthy young student volunteers in this study. By simple random sampling technique, volunteers will be allocated to two groups (group 1, control group; group 2, vinegar group).Each participant in vinegar group drink 15ml vinegar ( Ninghuafu, Sanxi, China) at noon and evening respectively for a period of four weeks.The end point of this study is comparison the outcomes of 24-hour urine and blood biochemical parameters between different group and point-in-time.

The purpose of this study is to assess whether certain beverages can increase urinary citrate levels in healthy individuals with no history of kidney disease.

To investigate the effectiveness of percutaneous nephrostomy catheter placement versus retrograde double J catheter placement in patients with symptoms of obstructive kidney disease (with either infection and/or pain and/or kidney function deterioration) caused by urolithiasis.

Urolithiasis (kidney stones) is a common disease process affecting people all across the world. Usually, if the stone size is small, it is able to pass through the urinary system and exit the bladder on its own with no treatment. However, when the size of the stone is bigger, it can get trapped in the kidney or the ureter, causing significant pain for the patient and potentially obstructing urine flow. If this occurs, surgical treatment is necessary for the removal of the stone. The surgical procedure often employed involves the use of a ureteroscope, which is a device that includes a camera and channels for working instruments such as a grasper and laser fiber to be placed during a procedure. Ureteroscopes that are currently in use are flexible and have the ability to treat stones that may otherwise be inaccessible in the kidney. Most flexible ureteroscopes in clinical use currently only have one channel therefore only allowing one instrument to be used at a time. Recently, a new type of ureteroscope has been introduced in the market that offers the advantage of having two working channels where two instruments can be inserted for use during stone treating procedure. This can potentially decrease procedure time for patients affected by kidney stones. The purpose of this research is to compare the efficacy and safety of the ureteroscopes that have only one channel for instrument insertion with the newer ureteroscope that has two channels for utilization during stone treatment.

Retrograde intrarenal surgery (RIRC) is used as standard treatment for stones less than 2 cm. In some cases, the ureteral access sheath cannot be placed due to ureteral stricture. In this case, a double j stent (DJ) is placed to passively dilate the ureter, and the RIRC is postponed for post-dilatation. The aim of the study is to determine the optimal time for RIRC operation in cases where a double j stent was placed for passive dilatation.

The aim of this research is to use a controlled laboratory setting to determine whether bacteria isolated from kidney stones of patients play a role in the formation of non-infectious kidney stones. It is well known that struvite stones are associated with active bacterial infection, however the role of bacteria in the formation of non-infection stones (like calcium oxalate) is not well characterized and there are theories that bacteria are involved in the making of these stones.

Urinary lithiasis is a common disease on young adults, but not so far on aging people. Nowadays, the investigators are seeing a gradative growth on men above sixty years old, mainly in industrialized countries. The purpose of this study is to investigate metabolic aspects of aging men with renal stones, towards blood tests, 24 hour-urinary samples, imagenological exams and bone densitometry. The investigators have made a case-control model.

The goal of this observational study is to analyse the occurence of urinary calculi after bladder augmentation in children: location of the calculi (kidney or bladder) type of bladder augmentation with higher rate of urinary calculi and why Find risk factors of urinary calculi in bladder augmentation (age, sex, other bladder procedures..)

To determine the optimal time between the first and second operations in patients with bilateral kidney stones and scheduled percutaneous nephrolithotomy for the contralateral kidney. Patients who underwent percutaneous nephrolithotomy to the contralateral kidney 2-4 weeks and 4-6 weeks after the first operation will be compared.