Cardiac extracellular volume fraction in cats with preclinical hypertrophic cardiomyopathy

Abstract

Background: Cardiac magnetic resonance imaging (CMR) allows for detection of fibrosis in hypertrophic cardiomyopathy (HCM) by quantification of the extracellular volume fraction (ECV). Hypothesis/Objectives: To quantify native T1 mapping and ECV in cats. We hypothesize that native T1 mapping and ECV will be significantly increased in HCM cats compared with healthy cats. Animals: Seventeen healthy and 12 preclinical HCM, age-matched, client-owned cats. Methods: Prospective observational study. Tests performed included indirect blood pressure, CBC, biochemical analysis including total thyroid, urinalysis, transthoracic echocardiogram, and CMR. Cats were considered healthy if all tests were within normal limits and a diagnosis of HCM was determined by the presence of left ventricular concentric hypertrophy ≥6 mm on echocardiography. Results: There were statistically significant differences in LV mass (healthy = 5.87 g, HCM = 10.3 g, P