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Transient myocardial thickening in cats associated with heart failure


Novo Matos, J; Pereira, N; Glaus, T; Wilkie, L; Borgeat, K; Loureiro, J; Silva, J; Law, V; Kranjc, A; Connolly, D J; Luis Fuentes, V (2018). Transient myocardial thickening in cats associated with heart failure. Journal of Veterinary Internal Medicine, 32(1):48-56.

Abstract

BACKGROUND: Cats with hypertrophic cardiomyopathy (HCM) and congestive heart failure (CHF) can have resolution of both left ventricular hypertrophy and CHF.
OBJECTIVES: To describe the clinical characteristics of cats with transient myocardial thickening (TMT) and CHF compared with a control population of cats without resolution of HCM.
ANIMALS: A total of 21 cats with TMT, 21 cats with HCM.
METHODS: Retrospective study. Clinical records at 4 veterinary centers were searched for TMT cases and a control group of cats with HCM and CHF. TMT was defined as initial maximal left ventricular wall thickness (LVWT) ≥6 mm with left-sided CHF, with subsequent resolution of CHF, reduction in left atrium/aorta (LA/Ao), and LVWT<5.5 mm. HCM was defined as persistent LVWT ≥6 mm.
RESULTS: Cats with TMT were younger (2 [0.4-11.4] years) than cats with HCM (8 [1.6-14] years) (P < 0.0001), and antecedent events were more common (15/21 versus 6/21, respectively) (P = 0.01). In cats with TMT, LVWT normalized from 6.8 [6.0-9.7] mm to 4.8 [2.8-5.3] mm and LA/Ao decreased from 1.8 [1.6-2.3] to 1.45 [1.2-1.7] after a mean interval of 3.3 (95% CI: 1.8-4.7) months. CHF recurred in 1 of 21 TMT and 15 of 21 cats with HCM. Cardiac treatment was discontinued in 20 of 21 cats with TMT and 0 of 21 HCM cats. All cats with TMT survived, whereas 8 of 19 cats with HCM died during the study period.
CONCLUSIONS AND CLINICAL IMPORTANCE: TMT occurs in younger cats, and antecedent events are common. The prognosis is better in cats with CHF associated with TMT than HCM.

Abstract

BACKGROUND: Cats with hypertrophic cardiomyopathy (HCM) and congestive heart failure (CHF) can have resolution of both left ventricular hypertrophy and CHF.
OBJECTIVES: To describe the clinical characteristics of cats with transient myocardial thickening (TMT) and CHF compared with a control population of cats without resolution of HCM.
ANIMALS: A total of 21 cats with TMT, 21 cats with HCM.
METHODS: Retrospective study. Clinical records at 4 veterinary centers were searched for TMT cases and a control group of cats with HCM and CHF. TMT was defined as initial maximal left ventricular wall thickness (LVWT) ≥6 mm with left-sided CHF, with subsequent resolution of CHF, reduction in left atrium/aorta (LA/Ao), and LVWT<5.5 mm. HCM was defined as persistent LVWT ≥6 mm.
RESULTS: Cats with TMT were younger (2 [0.4-11.4] years) than cats with HCM (8 [1.6-14] years) (P < 0.0001), and antecedent events were more common (15/21 versus 6/21, respectively) (P = 0.01). In cats with TMT, LVWT normalized from 6.8 [6.0-9.7] mm to 4.8 [2.8-5.3] mm and LA/Ao decreased from 1.8 [1.6-2.3] to 1.45 [1.2-1.7] after a mean interval of 3.3 (95% CI: 1.8-4.7) months. CHF recurred in 1 of 21 TMT and 15 of 21 cats with HCM. Cardiac treatment was discontinued in 20 of 21 cats with TMT and 0 of 21 HCM cats. All cats with TMT survived, whereas 8 of 19 cats with HCM died during the study period.
CONCLUSIONS AND CLINICAL IMPORTANCE: TMT occurs in younger cats, and antecedent events are common. The prognosis is better in cats with CHF associated with TMT than HCM.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:05 Vetsuisse Faculty > Veterinary Clinic > Department of Small Animals
Dewey Decimal Classification:570 Life sciences; biology
630 Agriculture
Language:English
Date:2018
Deposited On:10 Jan 2018 16:23
Last Modified:01 Mar 2018 01:53
Publisher:Wiley Open Access
ISSN:0891-6640
OA Status:Gold
Free access at:PubMed ID. An embargo period may apply.
Publisher DOI:https://doi.org/10.1111/jvim.14897
PubMed ID:29243322

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