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  • Title: Clinicopathological variables predicting progression of azotemia in cats with chronic kidney disease.
    Author: Chakrabarti S, Syme HM, Elliott J.
    Journal: J Vet Intern Med; 2012; 26(2):275-81. PubMed ID: 22269057.
    Abstract:
    BACKGROUND: Chronic kidney disease (CKD) is common in geriatric cats, but often appears to be stable for long periods of time. OBJECTIVES: To describe CKD progression and identify risk factors for progression in newly diagnosed azotemic cats. ANIMALS: A total of 213 cats with CKD (plasma creatinine concentration > 2 mg/dL, urine specific gravity < 1.035) were followed up until progression occurred or for at least 1 year; 132, 73, and 8 cats were in International Renal Interest Society (IRIS) stages 2, 3, and 4, respectively. METHODS: Progression was defined as a 25% increase in plasma creatinine concentration. Logistic regression was used to assess variables at diagnosis that were associated with progression within 1 year. Changes in IRIS stage during follow-up also were described. Cases that remained in stages 2 or 3, but did not have renal function assessed in the last 60 days of life, were excluded from analysis of the proportion reaching stage 4. RESULTS: Of the cats, 47% (101) progressed within 1 year of diagnosis. High plasma phosphate concentration and high urine protein-to-creatinine ratio (UPC) predicted progression in all cats. Low PCV and high UPC independently predicted progression in stage 2 cats, whereas higher plasma phosphate concentration predicted progression in stage 3 cats; 19% (18/94) of cats diagnosed in stage 2; and 63% (34/54) of cats diagnosed in stage 3 reached stage 4 before they died. CONCLUSIONS: Proteinuria, anemia, and hyperphosphatemia may reflect more progressive kidney disease. Alternatively, they may be markers for mechanisms of progression such as tubular protein overload, hypoxia, and nephrocalcinosis.
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