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                <term xml:lang="en">Deformation imaging</term>
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              <p>Aims - To evaluate the prognostic value of apical four-chamber (A4-C) longitudinal strain (LS) in patients with aortic stenosis (AS).  Methods and results - In a multicentre cohort, 582 patients (74.3 ± 10.9 years) with moderate or severe AS and preserved left ventricular (LV) ejection fraction (≥50%) were included in this retrospective study. Patients with severe AS were classified in four subgroups according to flow and gradient: low flow (LF) was defined as a stroke volume index &lt;35 mL/m2 compared with normal flow (NF); low-gradient (LG) as a mean gradient &lt;40 mmHg compared with high gradient (HG). The end point was all-cause of mortality. A4-C LS was measured by two-dimensional speckle tracking and was feasible in all patients. The degree of A4-C LV longitudinal dysfunction increased according to the severity and subgroups of severe AS: from the least to the most impaired: moderate AS, NF/HG, NF/LG, LF/HG, and LF/LG AS (P &lt; 0.001). During a mean follow-up of 2.6 ± 0.2 years, 58(10%) patients died. The 2-year survival was 76.8% in patients with LF/LG vs. 89.3% in patients with other groups. The best threshold of A4-C LS associated with overall mortality was an absolute cut-off value of |13.75%|. According to this cut-off, the 2-year survival was higher both in patients with moderate AS (96.3 vs. 70%, P = 0.02) and those with severe AS (92.9 vs. 80.9%, P = 0.005). However when dichotomized according to flow/gradient patterns, the association was only statistically significant in the subgroup of patients with NF/HG. By multivariable cox regression analysis, A4-C LS &lt;|13.75| remained independently associated with overall mortality (hazard ratio: 1.8; P = 0.045).  Conclusion - A4-C LS is independently associated with death in patients with AS and preserved LVEF, however the flow/gradient pattern should also be considered as an important parameter. The management of these patients may use A4-C LS as a new parameter of evaluation of LV function and prognosis.</p>
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