The cardiac monitor is mainly used to monitor patients’ vital signs, and it has the function of measuring respiration, pulse, blood pressure, heart rate, blood oxygen and other indicators. The functions are different and the normal parameters are also different. The data can be set according to the patient’s condition, and the alarm will prompt if it is lower than the normal value. And for some special groups, such as the elderly monitor index should be properly adjusted. Cardiac monitor parameters in the clinical reference value, the doctor can be prompted by the cardiac monitor for timely treatment. 1, respiratory parameters: the normal respiratory rate parameters of the cardiac monitor is 12-20 times / min; 2, pulse parameters: the normal pulse is 60-100 times / min; 3, blood pressure parameters: the normal range of blood pressure systolic blood pressure is 90-140mmHg, diastolic blood pressure is 60 -90mmHg. -In general, for elderly people over 60 years old, blood pressure is more normal if it is kept at 150/90mmHg; 4, heart rate parameters: normal heart rate is 60-100 times/minute; 5, blood oxygen parameters: normal range of oxygen saturation is 95%-100%. ECG monitor is often used for patients with cardiovascular diseases, such as arrhythmia, post-cardiopulmonary resuscitation, acute myocardial infarction, heart failure, cardiogenic shock or critical hypoxia patients, surgery patients, etc. Since ECG monitors can be used 24 hours a day, they can better record daily changes in vital signs and thus respond to unexpected conditions and complications.