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Related Concept Videos

Urinary Tract Calculi III: Medical Management01:30

Urinary Tract Calculi III: Medical Management

196
The diagnosis of renal calculi involves several imaging techniques, including non-contrast CT scans and ultrasound. These methods help visualize kidney stones, assess their size and location, and detect possible obstructions. Additionally, Measuring urine pH is useful for diagnosing specific stone types, such as struvite (alkaline pH) and uric acid stones (acidic pH). Cystine stones are primarily linked to cystinuria, a genetic condition. A urinalysis helps detect blood in the urine (hematuria)...
196
Urinary Tract Calculi IV: Nutrition Therapy and Prevention01:27

Urinary Tract Calculi IV: Nutrition Therapy and Prevention

356
Management of renal calculi focuses on effective strategies like tailored nutrition and hydration therapy. Adjusting diet and fluid intake reduces stone formation and recurrence, making these interventions simple yet powerful in kidney stone prevention and management.Understanding Kidney StonesKidney stones form when calcium, oxalate, uric acid, and cystine concentrate and crystallize in urine. Factors contributing to their formation include genetic predisposition, certain medical conditions,...
356
Urinary Tract Calculi VI: Surgical Management01:25

Urinary Tract Calculi VI: Surgical Management

384
Procedures for Kidney StonesMedical intervention is necessary when kidney stones or renal calculi are too large to pass spontaneously (typically greater than 5 millimeters) when stones are accompanied by symptomatic infection (such as fever or pyelonephritis), when they impair kidney function, or when they cause persistent symptoms like severe pain, nausea, or urinary retention. Additionally, patients with only one kidney or those who cannot be treated with medical management also require...
384
Urinary Tract Calculi V: Nursing Management01:28

Urinary Tract Calculi V: Nursing Management

266
AssessmentSubjective Data: Obtain a detailed health history, including any recent or chronic urinary tract infections, periods of immobilization, previous episodes of renal calculi, and medical conditions such as gout, benign prostatic hyperplasia, or hyperparathyroidism. Review the medication history for drugs that may influence stone formation, including allopurinol, analgesics, loop diuretics, or thiazide diuretics. Document the use of long-term indwelling catheters and any past surgical...
266
Urinary Tract Calculi II: Pathophysiology and Clinical Manifestations01:26

Urinary Tract Calculi II: Pathophysiology and Clinical Manifestations

373
Renal calculi, commonly termed kidney stones, are crystalline solid masses that form in the kidneys but can occur at any point within the urinary system, encompassing the kidneys, ureters, bladder, and urethra.The pathophysiology of renal stones involves several key factors: supersaturation of the urine with stone-forming constituents, changes in urine pH, a decrease in urine volume, and the presence of substances that promote or inhibit stone formation.Supersaturation of Urine: This is the...
373
Urinary Tract Calculi I: Introduction01:28

Urinary Tract Calculi I: Introduction

411
Renal calculi, or kidney stones, are solid deposits of minerals and salts formed inside the kidneys. In medical terminology, "calculus" refers to the stone itself, while "lithiasis" describes the process of stone formation. Depending on their location within the urinary system, these stones may be classified as either urolithiasis, when situated within the urinary tract, or nephrolithiasis, when located within the kidneys. Each term signifies the specific impact of the stone.Predisposition...
411

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Revisiting Uric Acid Stone Dissolution Kinetics: Insights for Optimizing Medical Therapy.

Paz Lotan1,2,3, Michael Mastai4, Yitzhak Mastai5

  • 1Department of Urology, University of Wisconsin, School of Medicine and Public Health, Madison, WI, USA.

European Urology Open Science
|September 17, 2025
PubMed
Summary
This summary is machine-generated.

Optimizing urine alkalinization for uric acid (UA) stone dissolution is key. Maintaining urine pH between 7-7.2 and increasing stone surface area significantly enhances UA stone dissolution rates.

Keywords:
ChemolysisKineticsMedical therapyNephrolithiasisStone dissolutionUric acid

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Area of Science:

  • Nephrology
  • Urology
  • Biochemistry

Background:

  • Urine alkalinization is the primary medical therapy for uric acid (UA) stone dissolution.
  • Existing recommendations are based on limited in vitro data and expert opinions.
  • The impact of lowering urine UA concentration in patients without hyperuricosuria requires further investigation.

Purpose of the Study:

  • To determine the optimal urine pH target for uric acid (UA) stone dissolution.
  • To evaluate the effect of reducing urine UA concentration on UA stone dissolution kinetics.
  • To refine medical therapy for patients with UA nephrolithiasis.

Main Methods:

  • Utilized ultraviolet-visible spectrophotometry to analyze UA stone dissolution rates.
  • Investigated dissolution kinetics in artificial urine across various pH levels and UA concentrations.
  • Employed X-ray diffraction to examine crystal structures of precipitates.

Main Results:

  • UA stone dissolution rates increased significantly with pH, with optimal dissolution at pH 7-7.2.
  • Dissolution rates were significantly higher for grounded stones compared to intact stones.
  • Lowering urine UA concentration enhanced dissolution only at pH >6.5 and after a 55% reduction.

Conclusions:

  • Urine alkalinization is crucial for UA stone dissolution, with optimal results at pH 7-7.2.
  • Increasing stone surface area (fragmentation) can further enhance dissolution.
  • Adequate alkalinization is necessary for effective treatment, even with medications like allopurinol.