(2) Plasma NT-proBNP level significantly correlates with heart failure based on Framingham criteria (r = 0.66; p < 0.001), functional heart failure based on NYHA classification (r = 0.676; p < 0.001), the stage of heart failure based on the ACC / AHA guidelines (r = 0.709; p < 0.001), left ventricle hypertrophy based on Sokolow-Lyon (r = 0.346; QTc (r = 0.471; p < 0.001), LVMI (r = 0, 701; p < 0, 001), diastolic dysfunction grades (r = 0.604; p < 0.001), DTE (r = 0.437; p < 0.001), IVRT (r = 0.29; p = 0.003), EF (r = - 0.414; p < 0.001), and systolic dysfunction grades (r = 0.502; p < 0.001).