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  • Title: Effect of furosemide and high-dosage pimobendan administration on the renin-angiotensin-aldosterone system in dogs.
    Author: Ames MK, Atkins CE, Lantis AC, Werre SR.
    Journal: Am J Vet Res; 2013 Aug; 74(8):1084-90. PubMed ID: 23879846.
    Abstract:
    OBJECTIVE: To determine whether a high dosage of pimobendan, when administered concurrently with moderate-dosage furosemide to healthy dogs, would activate the renin-angiotensin-aldosterone system (RAAS) more than furosemide alone. ANIMALS: 12 healthy dogs. PROCEDURES: 6 dogs received furosemide (2.0 mg/kg, PO, q 12 h) only, as an RAAS activator, for 10 days. The other 6 dogs received furosemide (2.0 mg/kg, PO, q 12 h) and pimobendan (0.6 mg/kg, PO, q 12 h) for 10 days. The effect of these drugs on the RAAS was determined by measurement of the aldosterone-to-creatinine ratio (A:C) in urine collected in the morning and evening of study days -2, -1, 1, 5, and 10. RESULTS: Although there was an increase in the urine A:C during the study period in both groups, it was significant only for dogs that received both drugs. The urine A:C only differed significantly between groups on day 1, at which time A:C was greater in the group that received both drugs. CONCLUSIONS AND CLINICAL RELEVANCE: High-dosage pimobendan administration neither substantially suppressed nor potentiated the RAAS when administered with furosemide in healthy dogs.
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