Objective Observe and analyze the cardiac rhythm characteristics of patients with chronic heart failure(HF)by using scattergram data of mono-lead 24 hours electrocardiogram(ECG). Methods In patients hospitalized for acute onset of heart failure and stable(oral medication was ableto control the symptoms)after treatment,a mono-lead ECG instrument(ECG electrodes of patch type,longitudinally pasted on the manubrium sterni,with a distance of 10.8 cm)was used to record the patient′s 24 hour long-term ECG.Utilizin...