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Related Concept Videos

Urinary Tract Calculi IV: Nutrition Therapy and Prevention01:27

Urinary Tract Calculi IV: Nutrition Therapy and Prevention

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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,...
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Urinary Tract Calculi III: Medical Management01:30

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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)...
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Urinary Tract Calculi II: Pathophysiology and Clinical Manifestations01:26

Urinary Tract Calculi II: Pathophysiology and Clinical Manifestations

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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...
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Urinary Tract Calculi I: Introduction01:28

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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...
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Urinary Tract Calculi V: Nursing Management01:28

Urinary Tract Calculi V: Nursing Management

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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...
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Urine Studies I: Urinalysis01:29

Urine Studies I: Urinalysis

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Urinalysis is a widely used diagnostic test that analyzes urine's physical, chemical, and microscopic characteristics. Healthcare providers use it to detect and monitor various health conditions, including renal disease, urinary tract infections (UTIs), diabetes, and metabolic or systemic disorders.Components of UrinalysisUrinalysis consists of three primary components: physical, chemical, and microscopic examination. Each provides unique insights into the urine sample and, by extension, the...
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Uric acid stone disease: lessons from recent human physiologic studies.

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|May 14, 2020
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Low urine pH in uric acid stone formers is caused by excessive acid excretion and reduced ammonia buffering. Pioglitazone treatment reversed these factors, increasing urine pH and offering a new treatment approach for uric acid nephrolithiasis.

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Area of Science:

  • Nephrology
  • Urology
  • Metabolic Medicine

Background:

  • Uric acid nephrolithiasis is primarily caused by overly acidic urine, leading to supersaturation with uric acid.
  • Recent studies link increased uric acid stone prevalence to metabolic syndrome features like dyslipidemia and hyperglycemia.

Purpose of the Study:

  • To review recent human physiologic studies on the pathophysiology and reversibility of low urine pH in uric acid stone formers.
  • To explore the causes of excessive acid excretion and reduced urinary buffering in uric acid stone formation.

Main Methods:

  • Review of human physiologic studies focusing on uric acid stone formers.
  • Analysis of diet-independent excessive net acid excretion and impaired renal ammoniagenesis.
  • Investigation of pioglitazone's effects on acid load, ammoniagenesis, and urine pH.

Main Results:

  • Excessive net acid excretion and reduced urinary buffering from impaired renal ammoniagenesis contribute to aciduria in uric acid stone formers.
  • Pioglitazone administration reduced renal acid load and enhanced ammoniagenesis and ammonium excretion.
  • Treatment with pioglitazone resulted in a significantly higher urine pH.

Conclusions:

  • Aciduria in uric acid nephrolithiasis stems from increased acid excretion and diminished ammonia buffering.
  • These factors are reversible with pioglitazone treatment, suggesting a new pathophysiology-based therapeutic strategy.
  • Further research into the origins of aciduria may lead to novel treatments for uric acid stones.