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Value of Cardiac Magnetic Resonance-based Feature Tracking in patients with myocarditis
Session:
Posters 3 - Écran 08 - Imagiologia Cardíaca
Speaker:
Catarina Ruivo
Congress:
CPC 2018
Topic:
B. Imaging
Theme:
03. Imaging
Subtheme:
03.3 Cardiac Magnetic Ressonance
Session Type:
Posters
FP Number:
---
Authors:
Catarina Ruivo; Eduardo Vilela; Ricardo Ladeiras-Lopes; Rita Faria; Nuno Dias Ferreira; Vasco Gama Ribeiro
Abstract
<p>BACKGROUD</p> <p>Cardiac magnetic resonance (CMR)-based feature tracking (FT) is a novel technique for quantification of myocardial deformation and may be used as an objective parameter of myocardial involvement in myocarditis. The aim of this study was to characterize myocardial strain alterations in patients with myocarditis applying FT and determine the relationships of left ventricle (LV) strain and strain rate with both LV ejection fraction (EF) and amount of late gadolinium enhancement (LGE).</p> <p>METHODS AND RESULTS</p> <p>A single-center, retrospective study was conducted by identifying patients with clinically suspected myocarditis that underwent CMR from 2012 to 2016. Inclusion criteria: presence of ≥ 2 Lake Louise criteria. Exclusion criteria: documented coronary artery disease; inability to perform FT analysis. A cohort of 78 patients (42.7 ± 17.2 years) were included. LV morphologic parameters were quantified: indexed LV end-diastolic (95.4 ± 31.9mL/m<sup>2</sup>) and end-systolic (47.3 ± 26.7mL/m<sup>2</sup>) volumes and LVEF (52.1 ± 12.8%). Extension of LGE and segmental wall-motion abnormalities (WMA) of the LV were quantified as percentage of segments affected using the standard American Heart Association segment model (LGE: 30.5 ± 21.8% and WMA: 29.3 ± 41.0%).</p> <p>Global systolic radial and circumferential strain (GRs: 30.8 ± 11.2% and GCs: -17.0 ± 4.9%) and strain rates (GRsr: 1.8 ± 0.7s<sup>−1</sup> and GCsr: -1.1 ± 0.3s<sup>−1</sup>) derived from FT were averaged from the basal, mid and apical LV short-axis plane; global systolic longitudinal strain (GLs: -16.3 ± 4.4%) and strain rates (GLsr: -1.1 ± 2.5s<sup>−1</sup>) were averaged from three standard longitudinal views. GRs or GRsr showed significant correlations with LVEF, extent of LGE and extent of segmental WMA as shown in the Scatter Diagrams of figure 1. Further significant correlations were also stablished between GCs/GLs and LVEF (GCs: r=-0.87, GCsr: r=-0.66, GLs: r=-0.68, GLsr: r=-0.65, p<0.001 for all) and extent of segmental WMA (GCs: r=0.73, GCsr: r=0.52, GLs: r=0.66, GLsr: r=0.55, p<0.001 for all).</p> <p>CONCLUSION</p> <p>The assessment of myocardial deformation applying FT on CMR images is feasible in patients with myocarditis. Those patients showed slightly reduced myocardial strains, making the FT analysis a possible contribute to the diagnosis of myocarditis. Strain and strain rate were closely correlated with LVEF as well as extension of segmental WMA. Correlations between GRs or GRsr and extension of myocardial fibrosis were also stablished.</p>
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