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  • Title: Effect of sampling time on urinary electrolytes following oral furosemide administration in dogs with myxomatous mitral valve disease.
    Author: Sabetti MC, Fidanzio F, Troìa R, Perissinotto L, Romito G, Mazzoldi C, Quintavalla C, Crosara S, Dondi F.
    Journal: J Vet Cardiol; 2022 Jun; 41():57-69. PubMed ID: 35245876.
    Abstract:
    INTRODUCTION/OBJECTIVES: Urine chemistry has received growing attention to estimate the diuretic response in dogs with cardiac disease. The aim of the study was to evaluate the impact of time elapsed between the oral furosemide administration and sample collection on urine chemistry in dogs with myxomatous mitral valve disease (MMVD) receiving diuretic therapy in American College of Veterinary Internal Medicine (ACVIM) stage C. MATERIALS AND METHODS: Seventy-three dogs with MMVD ACVIM stage C and 106 healthy dogs were prospectively included. Dogs with MMVD were divided, based on the time of sampling, in morning group (MMVD-MG) of one to 6 h and an evening group (MMVD-EG) over 6 h from oral furosemide administration. Analogously, healthy dogs sampled between 9 a.m. and 1 p.m. and between 2 and 7 p.m. were divided in a morning group (H-MG) and an evening group (H-EG), respectively. Urine chemistry, including fractional excretion of electrolytes, was evaluated and compared among groups. RESULTS: Higher excretion of sodium and chloride and higher urine sodium to urine potassium ratio (uNa+:uK+) were detected in MMVD-MG than MMVD-EG (P = 0.021, P = 0.038, and P = 0.016, respectively). Natriuresis, chloriuresis, and uNa+:uK+ were higher in MMVD-MG than H-MG, while no differences were found in the comparison between H-MG and H-EG and between MMVD-EG and H-EG. CONCLUSIONS: Urinary electrolyte excretion is significantly increased within 6 h from furosemide administration in MMVD ACVIM stage C dogs. Time of sampling from furosemide administration significantly affects urine chemistry in MMVD dogs and should be considered in clinical practice and the research field.
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