Irregular pulse is usually an arrhythmia, and the first step is to clarify the diagnosis and what type of arrhythmia it is. Treatments include medications such as amiodarone and metoprolol, and surgical treatments including radiofrequency ablation and heart surgery. The treatment of arrhythmia needs to be individualized with full consideration of the patient’s physical condition and the severity of the disease, etc. Pharmacological treatments include calcium channel blockers such as quinidine or procainamide, etc., β-adrenergic receptor blockers such as metoprolol, etc., medications that prolong the repolarization process such as amiodarone, etc., and calcium ion antagonists such as verapamil. Radiofrequency ablation can be performed as appropriate in the case of episodic supraventricular tachycardia, atrial flutter, atrial fibrillation, and premature ventricular contraction, and cardiac surgery, such as valve replacement and installation of a pacemaker, can be performed in the case of arrhythmias that do not respond to pharmacologic therapy. Other treatments include electrical cardioversion and vagus nerve stimulation. If an arrhythmia is detected, it is important to seek medical attention and follow the doctor’s instructions.