A longitudinal study of the persistence of increased creatinine and concordance between kidney biomarkers in cats and dogs.

Vet J. October 2021;276(0):105729.

H T Michael¹, R M MACK², E Hegarty³, D J McCrann⁴, G F Grauer⁵

¹ IDEXX, 1 IDEXX Drive, Westbrook, ME 04092, USA. Electronic address: helen-michael@idexx.com.; ² IDEXX, 1 IDEXX Drive, Westbrook, ME 04092, USA. Electronic address: rebekah-mack-gertig@idexx.com.; ³ IDEXX, 1 IDEXX Drive, Westbrook, ME 04092, USA.; ⁴ IDEXX, 1 IDEXX Drive, Westbrook, ME 04092, USA.; ⁵ College of Veterinary Medicine, Kansas State University, A-111 Mosier Hall, Manhattan, KS 66506-5802, USA.

Abstract

Kidney disease causes morbidity and mortality in dogs and cats. Serum creatinine concentration is an important surrogate marker for glomerular filtration rate (GFR). However, it is not always sensitive to small decreases in kidney function. Efforts to identify additional, more sensitive surrogate markers of GFR to improve detection of early kidney disease has led to the use of symmetrical dimethylarginine (SDMA) in veterinary medicine. There is insufficient information about the behavior of creatinine after an increase and the expected behavior of creatinine and SDMA in these cats and dogs. This study assesses the probability of persistence of increases in creatinine and the subsequent behavior of creatinine and SDMA in animals with persistently increased creatinine. For enrollment, three paired SDMA and creatinine concentrations were required: baseline (T0) with creatinine and SDMA at or below the upper reference limit (URL), T1, and T2 0.5-18 months after T1. The study included 4517 cats and 4576 dogs with increased T1 creatinine concentrations and 54,295 cats and 125,403 dogs with T1 creatinine at or below the URL. The probability of a persistently increased creatinine at T2 was approximately 58% for cats and 49% for dogs after a T1 increase. For animals without a T1 increase the probability of increased creatinine at T2 was only 7% for cats and 3% for dogs. For cats and dogs with persistently increased Cr, the probability of an increased SDMA concentration at T1 was 70-75%. By 24 months, that probability rose to 94% for cats and 88% for dogs.

Keywords

Biomarker; Data study; Kidney disease; Symmetric dimethylarginine;

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