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Clinical progression of cats with early-stage chronic kidney disease fed diets with varying protein and phosphorus contents and calcium to phosphorus ratios

Schauf, S; Coltherd, JC; Atwal, J; Gilham, M; Carvell-Miller, LJ; Renfrew, H; Elliott, J; Elliott, D; Bijsmans, ES; Biourge, VC; Watson, P; Bakke, AM

Authors

S Schauf

JC Coltherd

J Atwal

M Gilham

LJ Carvell-Miller

H Renfrew

J Elliott

D Elliott

ES Bijsmans

VC Biourge

P Watson

AM Bakke



Abstract

Background Dietary protein and phosphorus (P) restriction is the mainstay for nutritional management of chronic kidney disease (CKD). However, adequate restriction levels for cats with early CKD remain unclear. Objectives To investigate responses in cats with early CKD to varying dietary protein, P, and calcium (Ca) : P ratio. Animals Nineteen research colony cats with International Renal Interest Society stages 1-2 CKD. Methods In an opportunistic longitudinal case study, cats were fed a low protein (59 g/Mcal), low P (0.84 g/Mcal) dry diet (LP-LP; Ca : P = 1.9) for 18 months and later transitioned onto a moderate protein (76-98 g/Mcal), moderate P (1.4-1.6 g/Mcal) dry-wet diet regimen (MP-MP; Ca : P = 1.4-1.6) for 22 months. Fold-changes in serum creatinine, total Ca (tCa) and P (primary outcomes) and fibroblast growth factor 23 (FGF23) were assessed by linear-mixed models. Results While feeding LP-LP, mean serum creatinine decreased (0.87-fold, 95% confidence interval [CI] 0.81, 0.93, P < .001) to within reference range after 6 months, while increases in total Ca (tCa; 1.16-fold, 95% CI 1.11, 1.22, P < .001) and FGF23 (2.72-fold, 95% CI 1.72, 4.31, P < .001), but not in P (1.03-fold, 95% CI 0.945, 1.124, P = .94), were observed after 17 months. On MP-MP, mean creatinine, tCa and P remained within reference ranges and did not significantly change (P = .11, P = .98, and P = 1, respectively), while FGF23 significantly decreased (0.58-fold, 95% CI 0.36, 0.95, P = .02) after 22 months. Conclusions and Clinical Importance Cats with early CKD developed hypercalcemia after long-term feeding of a highly P-restricted diet. Increasing dietary P and reducing Ca : P ratio maintained renal markers, while improving Ca-P balance. Cats with early CKD could benefit from moderately protein- and P-restricted diets.

Citation

Schauf, S., Coltherd, J., Atwal, J., Gilham, M., Carvell-Miller, L., Renfrew, H., …Bakke, A. (2021). Clinical progression of cats with early-stage chronic kidney disease fed diets with varying protein and phosphorus contents and calcium to phosphorus ratios. Journal of Veterinary Internal Medicine, https://doi.org/10.1111/jvim.16263

Journal Article Type Article
Acceptance Date Aug 30, 2021
Publication Date Nov 1, 2021
Deposit Date Apr 25, 2023
Publicly Available Date Apr 26, 2023
Print ISSN 0891-6640
Publisher Wiley Open Access
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1111/jvim.16263
Keywords feline CKD; FGF23; hypercalcemia; IRIS 1-2; phosphate; GROWTH-FACTOR 23; GLOMERULAR-FILTRATION-RATE; CHRONIC-RENAL-FAILURE; PHOSPHATE HOMEOSTASIS; SURVIVAL; HYPERCALCEMIA; RESTRICTION; ASSOCIATION; AZOTEMIA; OXALATE

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