Elderly people aged 85 who suffer from cardiac arrhythmia without obvious clinical symptoms may not need to be fitted with a pacemaker; if the patient has obvious symptoms that affect his/her normal life, then he/she needs to be fitted with a pacemaker. A pacemaker is an implanted device with a built-in battery that intervenes in the electrical signaling of the heart by discharging the battery, controlling cardiac excitation and contraction, and thus treating some serious arrhythmias, such as III degree AV block or frequent atrial fibrillation. Pacemakers are usually not necessary when patients have no obvious symptoms and hemodynamic abnormalities, but they are necessary when patients have severe arrhythmias with hemodynamic instability that affect their quality of life. Whether a pacemaker is suitable for a patient needs to be determined by a medical professional, who will take into account the patient’s general condition.