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Funding Acknowledgements “This work was supported by a grant of Ministery of Research and Innovation, CNCS-UEFISCDI, project number PN-III-P1-1-TE-2016-0669, within PNCDI III” Background Differentiation between heart failure with preserved ejection fraction (HFpEF) and isolated diastolic dysfunction (DD) at rest is crucial, since the prognosis is different. Symptoms are often non-specific, while NTproBNP might not be available. Increased NTproBNP is predicted by none of the currently used transthoracic echocardiographic (TTE) parameters. However, assessment of left atrial (LA) function by speckle tracking echocardiography (STE) might be a potential new marker of increased LV filling pressure. Aim. To assess LA function by STE in HFpEF and DD, on top of the currently used TTE parameters, in order to establish the added value of LA deformation in the diagnosis of HFpEF. Methods 70 patients were enrolled prospectively: 40 with HFpEF (68 ± 9 yrs) and 30 with DD (60 ± 10 yrs). TTE was used to assess LV ejection fraction (LVEF), E/E’ ratio, left atrial volume index (LAVi), and systolic pulmonary arterial pressure (sPAP). STE was used to assess LA functions: reservoir function by strain from MVC to MVO (LASr) and positive strain rate (LASRr), conduit function by strain from MVO to onset of atrial contraction (LAScd) and early negative strain rate during conduit phase (LASRcd), and LA pump function by negative strain at MVC (LASct) and late negative strain rate during atrial contraction phase (LASRct). NTproBNP was measured in all patients. Results HFpEF patients had significantly higher LVEF, NTproBNP, E/E’ ratio, and sPAP, but similar LAVi compared to DD, suggesting higher LV filling pressure (Table). LA reservoir and conduit function were similar. However, LA pump function was significantly lower in HFpEF, expressed by LASRct (Tabel). NTproBNP correlated with E/E’ ratio, sPAP, and LASRct (all r = 0.44, p &amp;lt; 0.001), but not with LAVi. By multiple regression analysis, best predictor for NTproBNP &amp;gt; 125pg/ml was LASRct (r = 0.60, r2 =0.30, p &amp;lt; 0.001). LASRct &amp;lt; -1.29 (AUC = 0.82, sensitivity 75%, specificity 81%) was the only predictor of NTproBNP &amp;gt; 125pg/ml (Figure). Conclusion LA pump function is the only predictor of NTproBNP &amp;gt; 125pg/ml. This parameter should be incorporated in the current protocols for the diagnosis of HFpEF. Group (N) NTproBNP ng/ml LVEF (%) E/E’ sPAP (mmHg) LAVi (ml/m2) LASr (%) LASRr LAScd (%) LASRcd LASRct HFpEF (40) 329 ± 383 62 ± 6 10.4 ± 2.7 34 ± 11 40 ± 9 25 ± 4 1.28 ± 0.3 11.6 ± 5.5 -1.37 ± 0.5 -1.07 ± 0.6 DD (30) 37 ± 26 57 ± 8 7.5 ± 1.8 23 ± 7 39 ± 11 26 ± 6 1.26 ± 0.3 11.2 ± 3.6 -1.5 ± 0.6 -1.76 ± 0.7 P value 0.001 0.008 &amp;lt;0.001 &amp;lt;0.001 0.7 0.4 0.8 0.7 0.4 &amp;lt;0.001 Abstract 409 Figure.

european heart journal. cardiovascular imaging

409 Left atrial pump function assessed by speckle tracking echocardiography adds important value for the diagnosis of heart failure with preserved ejection fraction