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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

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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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Introduction:For diagnosing acute pyelonephritis, a comprehensive patient history is collected to identify symptoms such as dysuria, frequent or urgent urination, flank pain, or costovertebral angle (CVA) tenderness that may suggest a kidney infection.Physical ExaminationDuring the physical examination, CVA tenderness is assessed. This involves gentle percussion over the costovertebral angle, where tenderness often indicates a kidney infection.Diagnostic TestsUrinalysis: Used to identify white...
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Urine Studies I: Urinalysis01:29

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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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Urinary Tract Calculi IV: Nutrition Therapy and Prevention01:27

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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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Updated: Dec 18, 2025

Estimation of Urinary Nanocrystals in Humans using Calcium Fluorophore Labeling and Nanoparticle Tracking Analysis
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Nephrolithiasis and Elevated Urinary Ammonium: A Matched Comparative Study.

Wilson Sui1, Joel Hancock1, John R Asplin2

  • 1Department of Urology, Vanderbilt University Medical Center, Nashville, TN.

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|June 17, 2020
PubMed
Summary
This summary is machine-generated.

Elevated urinary ammonium in kidney stone formers is uncommon but linked to more complex health issues. Identifying this can guide personalized prevention strategies for recurrent kidney stones.

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Area of Science:

  • Nephrology
  • Urology
  • Biochemistry

Background:

  • Kidney stone disease affects millions globally.
  • 24-hour urine tests are crucial for identifying risk factors for stone recurrence.
  • Elevated urinary ammonium is an understudied abnormality in kidney stone formers.

Purpose of the Study:

  • To investigate the clinical characteristics associated with elevated urinary ammonium in kidney stone patients.
  • To identify potential risk factors and comorbidities in this patient group.

Main Methods:

  • Retrospective analysis of adult kidney stone patients with 24-hour urine tests (2006-2017).
  • Matched case-control study comparing patients with elevated urinary ammonium (n=121) to controls (n=242).
  • Comparison of medical history, urine analytes, and stone composition.

Main Results:

  • 7.1% of screened patients had high urinary ammonium.
  • Elevated ammonium group showed higher urine volume, oxalate, calcium, uric acid, sodium, chloride, and sulfate.
  • Associated comorbidities included higher BMI, recurrent UTIs, diabetes, gout, bowel resection, and urinary reconstruction.

Conclusions:

  • Elevated urinary ammonium is infrequent in kidney stone formers but indicates a higher burden of comorbidities.
  • These findings highlight the importance of a thorough patient history and targeted prevention strategies.
  • Further research may elucidate the specific role of ammonium in stone formation and recurrence.