Uremia (or Uraemia) is defined as the clinical syndrome that results when the kidneys can no longer filter toxins from the blood, essentially causing "urine in the blood." While often used interchangeably with Azotemia, there is a critical distinction: Azotemia refers merely to the number on the blood test (high creatinine/BUN), whereas Uremia refers to the illness the cat physically experiences because of those numbers.
In the Chronic Kidney Disease (CKD) cat, Uremia represents the transition from a "managed condition" to a "systemic crisis." It is a state of internal poisoning. The accumulated toxins affect every system in the body:
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Gastrointestinal: The toxins irritate the stomach lining, causing nausea, vomiting, and loss of appetite.
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Neurological: The toxins depress the brain, leading to severe lethargy, dullness, and eventually seizures or coma (Uremic Encephalopathy).
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Hematological: The toxins suppress the bone marrow, worsening anemia, and impair immune function.
A hallmark sign is the "uremic breath," a distinct ammoniacal odor caused by the breakdown of urea in the saliva. Treatment focuses on reducing the toxin load through fluid therapy (diuresis) to flush the blood and using diet and binders to prevent new toxins from forming.
Disclaimer: This content is for educational purposes only and does not constitute veterinary medical advice. Always consult with your primary care veterinarian or a veterinary internal medicine specialist regarding your cat’s specific condition.