Heart failure (HF) is a progressive systemic disease and a major public health problem in developed countries [1]. Despite modern progress in medical management, HF remains a common cause of recurrent hospitalization or death, and a number of prognostic predictors of HF have been reported, including age, New York Heart Association (NYHA) functional class, HF admission, clinical history of hypertension or chronic obstructive pulmonary disease, etiology of cardiomyopathy, blood pressure, brain natriuretic peptide (BNP) level, and parameters of echocardiography or electrocardiogram [2,3]. On the other hand, HF is a systemic clinical syndrome with multiple impaired organs due to low perfusion and congestion