Objective:To study the correlation of heart rate turbulence(HRT)in elderly patients with chronic heart failure(CHF)and left ventricular ejection fraction,NT-pro BNP and its significance.Method:According to random principle,80 elderly patients with CHF and 70 without heart failure of older patients with heart disease were enrolled and classified into two groups:research group(namely CHF group,it is divided into light,medium and severe heart failure subgroups,n=80)and control group(namely non-CHF group,n=70)....