Abstract
Objective
Speckle-tracking echocardiography (STE) deformation parameters detect latent LV dysfunction in chronic aortic regurgitation (AR) and are associated with outcomes. The aim of the study was to evaluate cardiac magnetic resonance (CMR) feature tracking (FT) deformation parameters in asymptomatic patients with AR and implications in outcomes.
Methods
Fifty-five patients with AR and 54 controls were included. Conventional functional CMR parameters, aortic regurgitant volume, and fraction were assessed. CMR-FT analysis was performed with a dedicated software. Clinical data was obtained from hospital records. A combined endpoint included all-cause mortality, cardiovascular mortality, aortic valve surgery, or cardiovascular hospital admission due to heart failure.
Results
Left ventricular (LV) mechanics is impaired in patients with significant AR. Significant differences were noted in global longitudinal strain (GLS) between controls and AR patients (− 19.1 ± 2.9% vs − 16.5 ± 3.2%, p < 0.001) and among AR severity groups (− 18.3 ± 3.1% vs − 16.2 ± 1.6% vs − 15 ± 3.5%; p = 0.02 for AR grades I–II, III, and IV). In univariate and multivariate analyses, circumferential strain (GCS) and global radial strain (GRS) but not GLS were associated with and increased risk of the end point with a HR of 1.26 (p = 0.016, 1.04–1.52) per 1% worsening for GCS and 0.90 (p = 0.012, 0.83–0.98) per 1% worsening for GRS.
Conclusions
CMR-FT myocardial deformation parameters are impaired in patients with AR not meeting surgical criteria. GLS decreases early in the course of the disease and is a marker of AR severity while GCS and GRS worsen later but predict a bad prognosis, mainly the need of aortic valve surgery.
Key Points
• CMR feature tracking LV mechanic parameters may be reduced in significant chronic AR with normal EF.
• LV mechanics, mainly global longitudinal strain, worsens as AR severity increases.
• LV mechanics, specially global radial and circumferential strain, is associated with a worse prognosis in AR patients.
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Abbreviations
- AR:
-
Aortic regurgitation
- CMR:
-
Cardiac magnetic resonance
- CMR-FT:
-
Cardiac magnetic resonance feature tracking
- GCS:
-
Global circumferential strain
- GLS:
-
Global longitudinal strain
- GRS:
-
Global radial strain
- LV:
-
Left ventricle
- RF:
-
Regurgitant fraction
- RV:
-
Regurgitant volume
- STE:
-
Speckle-tracking echocardiography
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The scientific guarantor of this publication is Covadonga Fernández-Golfín.
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Some study subjects or cohorts have been previously reported: Hinojar R, Fernández-Golfín C, González-Gómez A et al. Prognostic implications of global myocardial mechanics in hypertrophic cardiomyopathy by cardiovascular magnetic resonance feature tracking. Relations to left ventricular hypertrophy and fibrosis. Int J Cardiol. 2017: 249: 467-72.
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Fernández-Golfín, C., Hinojar-Baydes, R., González-Gómez, A. et al. Prognostic implications of cardiac magnetic resonance feature tracking derived multidirectional strain in patients with chronic aortic regurgitation. Eur Radiol 31, 5106–5115 (2021). https://doi.org/10.1007/s00330-020-07651-6
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DOI: https://doi.org/10.1007/s00330-020-07651-6