The normal value of heart rate is 60 to 100 beats per minute. People who have heart failure will have a faster heart rate, chest tightness, dyspnea and other discomforts. When cardiotonic, diuretic, oxygen and other treatments are given, the heart rate will drop or even return to normal. If the heart rate is 45 beats/minute, arrhythmia or even cardiac arrest is likely to occur. Heart rate of 45 times / min, this time to determine is sinus rhythm or non-sinus rhythm, sinus heart rate and less than 60 times / min, can be given to improve the symptoms of heart failure such as oxygen and continue to observe, such as the heart rate has been low, need to consider the addition of positive inotropic drugs; If this is not sinus rhythm, we should consider the possibility of pathological sinus node syndrome, third-degree atrioventricular block, serious symptoms require emergency pacemaker treatment. Symptoms need to be timely to the cardiovascular department.