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Crystalluria and Chronic Kidney Disease.

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Summary

Crystalluria, the presence of crystals in urine, affects all mammals and can lead to kidney disease and urinary tract obstruction. Proper diagnostic procedures are crucial for accurate identification and understanding of crystal-related health effects.

Keywords:
calculiend-stage kidneyhydronephrosispyelonephritisretrograde nephropathyurinary obstruction

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Area of Science:

  • Veterinary Medicine
  • Nephrology
  • Toxicology

Background:

  • Crystalluria, the presence of crystals in urine, is a common condition across all mammalian species, affecting both the kidney and lower urinary tract.
  • Urinary crystals, frequently composed of calcium, can arise from various endogenous and exogenous substances, impacting renal health and potentially leading to severe conditions like acute tubular necrosis and chronic renal disease.
  • Crystal aggregation can form calculi, causing urothelial abrasion, obstruction, and hydronephrosis, with long-term implications such as increased tumor risk in rodents.

Purpose of the Study:

  • To provide a comprehensive overview of crystalluria in mammals.
  • To highlight the diverse causes and consequences of urinary crystal formation.
  • To emphasize the importance of diagnostic procedures for crystalluria.

Main Methods:

  • Literature review of existing studies on crystalluria in mammalian species.
  • Analysis of crystal composition, formation factors, and associated pathologies.
  • Examination of species-specific differences in crystal-related effects.

Main Results:

  • Crystalluria is prevalent in mammals, with crystals identified in up to 100% of certain rat strains.
  • Renal diseases, including acute tubular necrosis and chronic renal disease, can be secondary to crystal accumulation (e.g., melamine-cyanuric acid in cats and dogs).
  • Urinary tract calculi formation can lead to obstruction, hydronephrosis, and, in rodents, an increased risk of urothelial tumors.

Conclusions:

  • Crystalluria is a significant condition with varied clinical manifestations and potential for severe renal and urinary tract damage across mammalian species.
  • Specific diagnostic protocols, such as avoiding animal fasting, are critical for accurate crystalluria assessment.
  • While animal models inform toxicity thresholds, extrapolation for cancer risk assessment requires careful consideration due to species-specific differences.