The median NT-proBNP level in patients with AHF were higher than those without AHF (12107 pg / ml and 546 pg / ml; p < 0.001). NT-proBNP level represented positive correlation with The NewYork Heart Association (NYHA) class (r=0, 68 < 0.7) and was changed with elavated age (p < 0.0001).