The cardiac monitor can simultaneously monitor the patient’s dynamic electrocardiogram shape, respiration, temperature, blood pressure (divided into non-invasive and invasive), oxygen saturation, pulse rate and other physiological parameters to help in disease treatment. 1.Assess the patient’s condition: assess the patient’s skin condition in the chest area, arms, fingers and other parts, and inform the patient and family of the purpose of the operation, the process and precautions; 2.Connect the power supply: connect the monitor power supply, turn on the machine Check the function of the machine is intact, standby; 3, check the information, position: three checks to check the patient’s information, assist the patient to lie flat, undress, expose the skin of the anterior chest area, clean with alcohol cotton balls; 4, paste electrode piece: clean the anterior chest area to be dry, paste the electrode piece in the corresponding position; 5, tie the cuff: tie the cuff bag to the patient’s elbow fossa on two horizontal fingers, look for the brachial artery pulsation, tighten to one finger is appropriate; 6, wear oxygen saturation clips: the patient’s elbow fossa on two horizontal fingers, look for the brachial artery pulsation. 6, wear oxygen saturation clip: clip the oxygen saturation instrument on the patient’s fingers, pay attention to the front and back, do not clip the opposite; 7, adjust the value of the alarm interval: adjust the machine mode and detection of vital signs alarm range according to the condition; 8, comfortable position: assist the patient to take a comfortable position, adjust the position of the instrument and the position of the wire, placed reasonably. After the installation of the ECG monitor, the patient should not remove or adjust the instrument by himself, and pay attention to the wire pulling when turning or changing the position, etc.