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  • Title: Tolerance of torasemide in cats with congestive heart failure: a retrospective study on 21 cases (2016-2019).
    Author: Poissonnier C, Ghazal S, Passavin P, Alvarado MP, Lefort S, Trehiou-Sechi E, Saponaro V, Barbarino A, Delle Cave J, Marchal CR, Depré B, Vannucci E, Tissier R, Verwaerde P, Chetboul V.
    Journal: BMC Vet Res; 2020 Sep 16; 16(1):339. PubMed ID: 32938442.
    Abstract:
    BACKGROUND: In dogs with congestive heart failure (CHF), the efficacy of torasemide, a loop diuretic, has been demonstrated. However, unlike in dogs and humans little has been described about the use of torasemide in the cat with spontaneous CHF. The objectives of this retrospective study were therefore to describe the therapeutic use of oral torasemide in cats with spontaneous CHF, document its potential adverse effects while reporting the clinical course of this feline population following torasemide administration in addition to standard medical therapy. RESULTS: Medical records of 21 client-owned cats with CHF (median age = 10.6 years [interquartile range (IQR) = 6.5-11.2]) receiving torasemide were reviewed. Data collected included torasemide dosages, other concurrent medications, physical examination features, echocardiographic data, and potential adverse effects during follow-up. A survival analysis was performed to estimate the time from diagnosis to cardiac death. Dyspnea related to CHF was identified in all cats (pleural effusion [8/21], pulmonary edema [5/21] or both [8/21]), associated with ascites in 4/21 cats. The CHF cause was determined by echocardiography in all cats: hypertrophic (n = 10), restrictive (n = 6), arrhythmogenic right ventricular (n = 3), dilated (n = 1) cardiomyopathies, and aortic valve abnormality (n = 1). At initiation, median torasemide dosage was 0.21 mg/kg [IQR = 0.17-0.23] q24h. Clinical signs declined in most cats (20/21) during the first 2 weeks with no remarkable adverse events. Median survival time after torasemide prescription was 182 days [IQR = 46-330]. A contemporary control group including 54 cats with CHF, receiving furosemide as sole loop diuretic treatment was compared with the study group. Median (IQR) survival time of cats in the control group was not significatively different (p = 0.962) from that of the torasemide group, i.e., 148 days (9-364), although the torasemide group included significantly more cats with recurrent episodes of CHF (52%) that the control group (19%). CONCLUSIONS: This case series demonstrates that torasemide can be used in cats with spontaneous CHF. This therapeutic interest needs to be confirmed by prospective clinical trials.
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