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[Left atrial contractility function in hypertension].

UNLABELLED
The purpose of this study was the assessment of the left systolic atrial function (LSAF) in 45 hypertensive subjects (HS) with left ventricular hypertrophy (LVH). (LV mass index) (LVMI) (> 134 g/m2 for men, > 110 g/m2 for women) and in 32 normal subjects (NS). The both groups were matched for age, body surface, heart rate and LV fractional shortening. Left atrial volume (LAV) was calculated by the formula: LAV = 8 A1 x A2/3 pi l in which A1 is the area of the four-chamber view, A2 is the area of the two-chamber view and L is common length in the two views. The atrial function contractility was evaluated by the following parameters: 1. LA stroke volume (LASV) = LAV - LAMV where LAV is the volume before atrial systole and LAMV is the LA minimal volume. 2. LA ejection fraction (LAEF) = LASV/LAV. 3. Atrial ejection force (AEF) = peak A/MOA in which peak A wave is the maximal late diastolic velocity and MOA is the mitral orifice area. 4. Atrial transport (AT) = A/M in which M area is under the mitral velocity curve and A-area under the late diastolic velocity curved assessed by Doppler echo. [table: see text] Thus all above parameters are significantly increased in HS. In HS, LASV is correlated to LAV (r = 0.84; p < 0.001) and to LVMI (r = 0.32; p < 0.05). LAEF is correlated to peak A (r = 0.90; p < 0.001) and LVMI (r = 0.34; p < 0.05).


CONCLUSIONS
In HS with LVH in comparison with N, the increase of the LA contractility is considered to be urged by the increase of LAV (Frank-Starling's law). These data could be explained by the less distensibility of LV chamber in relation to LVH.