[Atrial functional mitral regurgitation. Three-dimensional echocardiographic study]
José Miguel Hernández-Ramírez1, José Ramón Ortega-Trujillo1
1Unidad de Imagen, Departamento de Cardiología, Hospital Universitario de Gran Canaria Dr. Negrín, Las Palmas de Gran Canaria, Las Palmas, España.
Archivos De Cardiologia De Mexico
|July 29, 2017
Summary
Atrial fibrillation causes left atrium enlargement and a more circular mitral annulus, leading to functional mitral regurgitation. Key factors include the ellipticity index and diameter ratio.
Area of Science:
- Cardiology
- Cardiac Imaging
Background:
- Atrial fibrillation (AF) is associated with left atrium remodeling.
- This remodeling can induce functional mitral regurgitation (FMR).
Purpose of the Study:
- To identify mitral annulus features related to AF-induced FMR.
- To understand the geometric changes in the mitral annulus during AF.
Main Methods:
- Retrospective analysis of 29 patients with persistent AF and 36 controls.
- Three-dimensional transesophageal echocardiography to assess mitral annulus characteristics.
- Correlation of echocardiographic parameters with the effective regurgitant orifice (ERO).
Main Results:
- Patients with AF exhibited larger left atrium volume and anteroposterior diameter, with reduced diameter change.
- The ellipticity index and height-anterolateral-posteromedial diameter ratio were independent predictors of ERO in the AF group.
- These parameters explained 69.9% of the variance in ERO (R²=0.699, P=.019).
Conclusions:
- Atrial fibrillation induces left atrial dilation and alters mitral annulus geometry, promoting a circular shape.
- The ellipticity index and height-anterolateral-posteromedial diameter ratio are crucial determinants of FMR in AF.
- These findings aid in understanding and potentially managing FMR in AF patients.
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