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Left atrial volume and function in valvular aortic stenosis
F Triposkiadis1, C Pitsavos, H Boudoulas
1Department of Cardiology, Medical School of the University of Athens, Greece.
The Journal of Heart Valve Disease
|January 1, 1993
Summary
In aortic stenosis, the left atrium enlarges and compensates for reduced function, maintaining cardiac output. This atrial enlargement is linked to left ventricular mass.
Area of Science:
- Cardiology
- Cardiac Physiology
- Echocardiography
Background:
- Aortic stenosis (AS) is a significant valvular heart disease.
- Left atrial (LA) volume and function are crucial for maintaining cardiac output.
- Understanding LA adaptations in AS is important for patient management.
Purpose of the Study:
- To evaluate left atrial volume and function in patients with aortic stenosis.
- To correlate left atrial parameters with left ventricular mass in AS.
- To determine the compensatory role of the left atrium in aortic stenosis.
Main Methods:
- Echocardiography was used to measure left atrial volumes at specific cardiac cycle points.
- Biplane techniques were employed for accurate volume measurements.
- Aortic stenosis patients (n=20) were compared to normal controls (n=10).
Main Results:
- Maximal left atrial volume was significantly increased in AS patients compared to controls (74.8 vs. 46.4 cm3, p < 0.005).
- Maximal LA volume correlated directly with left ventricular mass (r = 0.77).
- While passive emptying fraction was reduced in AS, active emptying volume and total emptying volume were maintained, indicating compensatory mechanisms.
Conclusions:
- Left atrial dilatation in aortic stenosis is related to left ventricular mass.
- The left atrium plays a compensatory role in maintaining cardiac output in AS.
- Atrial dilatation helps preserve stroke volume and cardiac output despite impaired passive emptying.