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Background Atrial fibrillation (AF) is one of the most common cardiovascular diseases in the world, can cause many structural and functional cardiac abnormalities, one of them is left ventricular (LV) systolic dysfunction which may not be detected by conventional echocardiographic parameters (CEP) and need to use a modality of real time triplain (3P) speckle tracking strain for early detection and improvement of prognosis Purpose Assessment of LV systolic function in AF patients with normal ejection fraction (EF) using 3P speckle-tracking strain and its role as early predictor of subclinical dysfunction Methods A case-control study was conducted at Baghdad Heart Center, Baghdad Medical City since July 2017 to July 2018, including patients with AF and control group. The CEP (EF, diastolic function, mitral annular plane systolic excursion) and speckle tracking longitudinal strain were done for the patients by 3P in comparison with two dimension (2D) Results The study included two groups. First group: 100 patients with AF, mean age (48 ± 12.2) ranging between (25-81), (48%) men, (52%) women. Second group: 100 control patients with mean age (46.4 ± 13.1) ranging between (20-84), (58%) men, (42%) women. 3P method showed more easy and accurate in comparison with 2D method in patients with AF. Applying cut off value of (-17.5%), it was found that 71% of AF patients had undetected LV systolic dysfunction even with preserved EF. Global longitudinal strain was reduced significantly in those with AF group and reduced mitral annular plane systolic excursion Conclusion(s) Real time triplain speckle tracking can be dependable which is easy, useful, and more accurate in comparison with 2D method in assessment of LV function in patients with AF. 3P method is a useful tool in the early detection of subtle LV systolic dysfunction in AF patients with preserved EF and in whom more aggressive interventions could have a significant impact on prognosis. 3P vs 2D in Patients with AF and Control Average GLS by 3P % Average GLS by 2D % p-value No. Mean± SD No. Mean± SD AF group EF &amp;lt; 52 % 29 -11.23± 3.89 29 -12.05± 3.84 0.01 EF ≥53 % 71 -13.30± 2.55 71 -14.20± 2.64 0.001 Control group EF &amp;lt; 52 % 2 -21.15± 4.45 2 -20.20± 1.84 0.6 EF ≥53 % 98 -19.14± 1.49 98 -19.91± 1.66 0.001 3P, real time triplain; 2D, two dimension; AF, atrial fibrillation; GLS, global longitudinal strain; SD, standard deviation; EF, ejection fraction

european heart journal. cardiovascular imaging

P775 Assessment of left ventricular function in patients with atrial fibrillation using real time triplain speckle tracking in comparison with 2D speckle tracking