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Funding Acknowledgements none Background In degenerative mitral regurgitation (DMR), left ventricle (LV) and left atrium (LA) undergo progressive volume overload leading to chamber remodelling and dysfunction in advanced stages. Speckle tracking echocardiography (STE) is an estabilished technique able in detecting subclinical LA and LV dysfunction in this setting. However data are lacking on the relationship of LA and LV function in DMR patients. Purpose Our aim was to assess LA function in patients with DMR and to explore its possible correlations with LV dimensions and systolic function. Methods We enrolled 95 patients with mild to severe DMR, dichotomizing them on the basis of mitral regurgitation severity (DMR 1-2: mild and mild-to-moderate MR; DMR 3-4: at least moderate to severe MR). LA function was assesed with 2D speckle tracking echocardiography. Results The two groups were well matched. DMR 3-4 group (n= 48) showed higher LA and LV volumes, lower right ventricle longitudinal systolic function and higher values of systolic pulmonary pressure. There was not significant difference in LV ejection fraction (LVEF) and global longitudinal strain (GLS). Among LA function indexes, only peak systolic reservoir strain was significantly reduced in DMR 3-4 group (21,9± 6,2% vs 24,7± 7,2% ; p= 0,04). Then population study was further divided in two groups according to the presence (LA dys+) or absence (LA dys-) of LA dysfunction, defined as reservoir strain values below the median [median 23.7%; LAdys- group (n. 49), LAdys+ group (n.46) ]. At the comparison of continuous variables (Tab.1), LAdys+ group showed larger LV end systolic diameter and more impaired LVEF (60,9± 9,8% vs 65,4± 4,8%; p: 0,004) and GLS (20,04 ± 3,7% vs 23,53 ± 2,7%; p &amp;lt;0,001). Conclusions Our data showed that LA reservoir strain was impaired in patients with moderate to severe DMR. Furthermore, patients with LA dysfunction showed reduced LVEF and GLS values. Consequently, LA dysfunction assessed with STE may be a novel marker of early LV systolic dysfunction in patients with degenerative mitral regurgitation. Tab.1 LAdysf- (n = 49) LAdysf+ (n = 46) P value LVESD (mm) 31.78 ± 4.1 34.74 ± 7.6 0.020 LAVI (mL/mq) 44.5 ± 15.1 55.6 ± 25.6 0.015 TAPSE (mm) 26.30 ± 3.96 24.02 ± 3.31 0.004 sPAP (mmHg) 31.4 ± 7.0 36.4 ± 10.9 0.009 LVEF (%) 65.4 ± 4.8 60.9 ± 9.8 0.004 GLS (%) 23.5 ± 2.7 20.0 ± 3.7 &amp;lt;0.001 Comparison of continuous variables between patients with and without LA dysfunction.

european heart journal. cardiovascular imaging

P664 Relationship of left atrial function assessed by 2D speckle tracking echocardiography with left ventricular systolic function in patients with degenerative mitral regurgitation