When the pulse is fast and slow, the most likely is arrhythmia, the occurrence of atrial fibrillation, atrial fibrillation when feeling the pulse found that the pulse is different fast and slow, and the pulse strength is also different, medical known as pulse dwarf. Occasional fast and slow pulses and palpitations appear, and atrial fibrillation appears clinically and requires a visit to the hospital. An electrocardiogram must be examined to clarify whether atrial fibrillation occurs, and if atrial fibrillation occurs initially, prevention and active management are required. If the symptoms appear very early, radiofrequency ablation, active control of ventricular rate and anticoagulation therapy may be required, and the treatment varies. If the pulse appears fast and slow, the most likely is atrial fibrillation, but the ECG only finds premature beats, ventricular premature or atrial premature, and it is related to the physical condition, so it should be properly observed whether the slow and fast pulse can gradually disappear, and if it disappears after rest, there is no need for treatment. If the ECG is reviewed after rest, and there is still ventricular premature or atrial premature, medication should be administered, including oral Betalac, and then observed, and the ECG should be reviewed again at intervals to see if the pulse disappears when it is fast and slow, and further treatment should be taken.