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Left atrial performance indices in chronic mitral valve disease
H Boudoulas1, D Boudoulas, E A Sparks
1Ohio State University Medical Center, Division of Cardiology, Columbus 43210, USA.
Insights
Multidimensional left atrial (LA) performance indices reveal increased LA kinetic energy (LAKE) in mitral stenosis and regurgitation. Standard LA volume measurements are insufficient; advanced analysis is needed for chronic mitral valve disease.
Area of Science:
- Cardiology
- Echocardiography
- Cardiac Physiology
Background:
- Multidimensional left atrial (LA) performance indices are understudied in chronic mitral valve disease.
- Standard LA measurements may not fully capture functional changes.
Purpose of the Study:
- To evaluate multidimensional LA performance indices in patients with mitral stenosis and chronic mitral regurgitation.
- To compare these indices with normal control subjects using biplane transthoracic echocardiography and pulsed Doppler.
Main Methods:
- Measurements included LA maximal volume, stroke volume, ejection fraction, and A-wave velocity.
- LA kinetic energy (LAKE) was calculated using LA stroke volume and A-wave velocity.
- Biplane transthoracic echocardiography and pulsed Doppler were employed.
Main Results:
- LA volumes were significantly greater in mitral stenosis and regurgitation compared to controls.
- LA ejection fraction did not differ significantly among the groups.
- LA kinetic energy (LAKE) was significantly increased in mitral stenosis and regurgitation (p < 0.001), with an inverse correlation to mitral valve area in mitral stenosis (r = 0.66, p < 0.01).
Conclusions:
- Standard LA size and volume measurements are insufficient for assessing LA function in chronic mitral valve disease.
- Multidimensional analysis, including LAKE, provides deeper insights into LA function and its alterations in mitral valve disease.
- Advanced LA performance indices are crucial for a comprehensive understanding of chronic mitral valve disease progression.
Abstract:
Multidimensional left atrial (LA) performance indices have not been extensively studied in chronic mitral valve disease. LA maximal volume, stroke volume (LA volume at atrial systole minus LA minimal volume), LA ejection fraction (stroke volume/volume at atrial systole) and A-wave velocity, were measured in 14 patients with mitral stenosis (mean mitral valve area 1.5 cm2); 14 patients with chronic mitral regurgitation all in sinus rhythm; and were compared to 20 age and sex matched normal control subjects using biplane transthoracic echo and pulsed Doppler. Although LA volumes--maximal and at onset of atrial systole--were greater in mitral regurgitation and mitral stenosis (p < 0.01) compared to normal subjects, LA ejection fraction was not statistically different among the three groups. LA stroke volume was greater in mitral regurgitation and mitral stenosis compared to normal subjects, p < 0.01. LA kinetic energy (LAKE) = 1/2 mv2 (m = LA stroke volume x 1.06, blood's specific gravity, v = A wave velocity) was increased in mitral stenosis and mitral regurgitation compared to normal subjects (p < 0.001). An inverse correlation (r = 0.66, p < 0.01) was present between LAKE and mitral valve area in mitral stenosis. It is concluded that LA function, a complex interplay of multiple factors, requires multidimensional methods of analysis beyond standard measurements of size and volume, which provide additional insight into normal LA function, and better definition of LA function changes involved in the natural history of chronic mitral valve disease.