View clinical trials related to Kidney Calculi.
Filter by:Authors want to investigate the usefulness of flexible cystoscopy in performing laparoscopic pyelolithotomies and ureterolithotomies by comparing operative results of a single surgeon's experience.
Shockwave lithotripsy (SWL) is a safe, non-invasive treatment for renal calculi. During SWL energy is focused on in order to break kidney stones and this energy can be varied in size from a narrow (or small) focal zone to a wide (or large) focal zone. This is a multi-centered, randomized study comparing the single treatment success rates of narrow and wide focal zones during SWL.
Calcium oxalate nephrolithiasis is a relatively common disease. The prevalence in the general population may range from 10 to 12 percent, and 0.4 to 1 percent of new cases are reported every year according to different series. Without specific pharmacological therapy, the recurrence rate in patient with established diagnosis of nephrolithiasis is extremely high and may range from 15 to 20 percent per year, with a cumulative incidence at five years ranging from 27 to 50 percent.Although genetic factors play an important role in the development of nephrolithiasis, environmental factors such as diet also appear to affect stone formation. Potassium citrate is also effective in preventing stone recurrence in patients with calcium oxalate nephrolithiasis. Low tolerability, however, may remarkably limit the use of these medication. Citrus fruits are a natural rich source of citrate and diet supplementation with juice of citrus fruits may represent a valuable alternative option to supply citrate without exposing the patients to the adverse effects of citrate containing medications. Among the most commonly consumed citrus fruits, lemons contain the greatest concentrations of citric acid (49,2 g/Kg);a half cup of pure lemon juice can provide a daily amount of citrate comparable to that of a standard daily dose of alkali citrate medications. A few studies tried to evaluate the effects of lemon juice supplementation in patients with calcium oxalate nephrolithiasis, but the findings were flawed by the retrospective, observational design of the study or by the too small sample size that limited the power of statistical analyses and the reliability of the results. This study will be primarily aimed at evaluating whether lemon juice added to standard diet recommendations compared to diet recommendations alone may reduce the risk of new stone formation in patients with recurrent idiopathic calcium oxalate nephrolithiasis. Secondarily, the study will evaluate the effects of lemon juice supplementation on complications of nephrolithiasis such as urinary tract infections, colic symptoms, and hospitalizations for stone disruption or removal, as well as the effects on urinary factors (such as urinary citrate, oxalate, calcium excretion or pH) that may favor or limit stone formations and the relationships between these effects and the risk of stone recurrence.
Patients suspected of having a kidney stone are usually evaluated by computed tomography (CT) scan. The investigators hypothesize that ultrasound (U/S) should be sufficient to evaluate kidneys for suspected renal stones.
The purpose of this study is to assess if patients treated with silodosin will have a higher spontaneous passage rate of their ureteral stone than those treated with placebo.
Sodium thiosulfate may be useful to prevent recurrence of calcium-containing kidney stones. It will be studied in people with high amounts of urine calcium.
The purpose of this study is to determine the efficacy of febuxostat, once daily (QD), compared to allopurinol or placebo in patients with excessive amounts of uric acid in their urine and who have recently had kidney stones.
The purpose of this study is to determine whether Renalof administration promotes partial or total dissolution of urinary calculi and improves physicochemical parameters and metabolic activity in patients with recurrent calcic urolithiasis. The duration of this double-blind placebo controlled phase 3 clinical trial will be 12 weeks. The estimated number of patients to be recruited and randomized for the study is 110. Ultrasonographic and humoral parameters will be assessed every 4 weeks.
The investigators plan to compare three different devices that are used to break up large kidney stones during surgery for removal to see if one is faster or more efficient than the others.
The purpose of this clinical study is to evaluate BackStop, a polymer-based device that is intended to be used during ureteroscopic lithotripsy to prevent retrograde stone migration. It is a water soluble polymer with reverse thermosensitive properties; the polymer exists as a liquid at low temperature (below 17 C) and rapidly transitions to a high viscosity gel at body temperature (i.e. in the ureter). BackStop is injected above the stones in the ureter and is intended to prevent retrograde migration of stones during ureteroscopic lithotripsy. Upon completion of the lithotripsy procedure, BackStop dissolves naturally or by irrigation. The study hypothesis is that a greater proportion of patients will experience no retropulsion of a kidney stone when BackStop is used versus no anti-retropulsion device when undergoing intracorporeal lithotripsy.