Results: In patients with left ventricular ejection fraction < 50%, there were significant tight correlations between mean E / e' (r = 0.767, p < 0.001), septal E / e' (r = 0.725, p < 0.001), lateral E / e' (r = 0.590, p = 0.001), maximal tricuspid regurgitation velocity (r = 0.655, p < 0.001) and left ventricular end diastolic pressure.