Cardiac extracellular volume fraction in cats with preclinical hypertrophic cardiomyopathy

Research output: Contribution to journalArticlepeer-review

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 <.0001), native T1 mapping (healthy = 1122 ms, HCM = 1209 ms, P =.004), and ECV (healthy = 26.0%, HCM = 32.6%, P <.0001). Variables of diastolic function including deceleration time of early diastolic transmitral flow (DTE), ratio between peak velocity of early diastolic transmitral flow and peak velocity of late diastolic transmitral flow (E : A), and peak velocity of late diastolic transmitral flow (A wave) were significantly correlated with ECV (DTE; r = 0.73 P =.007, E : A; r = −0.75 P =.004, A wave; r = 0.76 P =.004). Conclusions and Clinical Importance: Quantitative assessment of cardiac ECV is feasible and can provide additional information not available using echocardiography.

Original languageEnglish (US)
Pages (from-to)812-822
Number of pages11
JournalJournal of veterinary internal medicine
Volume35
Issue number2
DOIs
StatePublished - Mar 1 2021

Keywords

  • T1 mapping
  • cardiac fibrosis
  • feline
  • magnetic resonance imaging
  • strain

ASJC Scopus subject areas

  • veterinary(all)

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