The previous clinical observation methods are not easy to identify early hypoxia, and the pulse oximetry (SpO2) monitor is used for continuous non-invasive monitoring. It can continuously observe the oxygenation of the body and detect early hypoxemia in time to provide clinical rescue and care. Based on the same, it can avoid the pain caused by multiple arterial blood loss to the patient and reduce the workload of the nurse. Principle of pulse oximetry monitoring The SpO2 measurement measures the light transmission intensity through the tissue bed by using a finger as a transparent container for hemoglobin and a red light with a wavelength of 660 nm and near-infrared light of 940 nm as an incident light source. To calculate hemoglobin concentration and blood oxygen saturation. It can be used for blood oxygen monitoring in various patients. It is generally believed that SpO2 should be no less than 94% normal, and below 94% is insufficient oxygen supply. Some scholars have set SpO2 <90% as the standard for hypoxemia. Pulse blood oxygen saturation monitoring method In addition to monitoring SpO2, the ECG monitor can also monitor body temperature, respiration, non-invasive blood pressure, and ECG/heart rate. Blood pressure and ECG were monitored simultaneously in this group, and the monitoring time was 48-72 hours. If the reading suddenly drops during the monitoring period, check whether the probe is loose or not. Check the skin condition of the finger at the probe every 4 hours, observe whether there is redness, swelling, skin damage, and replace it with another finger. Clinical application of pulse oximetry monitoring 1 Adjust the oxygen concentration according to the change of SpO2 The level of oxygen concentration and the amount of flow can indirectly or directly affect the reading of SpO2. In this group of patients, in order to maintain adequate SpO2, the patient received routine oxygen inhalation for 36-72 h. When the patient returned to the room, we adjusted the oxygen flow rate to 4-5 L/min, and the inhaled oxygen concentration was 37%-41%, so that SpO2 As soon as possible, 96% to 99%, after a few hours, according to the SpO2 reading, adjust the oxygen concentration in time to avoid oxygen poisoning caused by excessive oxygen concentration, or hypoxemia caused by low oxygen concentration. It has been reported that hypoxemia patients with oxygen through the nasal cannula, flow 2 ~ 4 L / min, oxygen inhalation time 30min, can increase the SpO2 reading by 3% ~ 4%. 2 Master the sucking time according to the value of SpO2 Patients with thoracic surgery, mostly due to drainage tube stimulation and wound pain, do not dare to cough and sputum, so that sputum retention of the respiratory tract affects the lung ventilation function, leading to tissue hypoxia, such as sputum block the airway can cause lung infection or Lack of lungs. In this group of cases, ultrasound nebulization was routinely given twice a day, and every 2 to 4 hours of sucking was performed every 2 hours. The patient was turned over once every 2 hours and the patient was encouraged to cough and sputum to clear the respiratory secretions and promote lung recruitment. Patients with a history of smoking in the clinic often have more respiratory secretions. Excessive frequency suction will increase respiratory stimulation and affect lung ventilation, and conversely, respiratory secretions will be retained. Using SpO2 for monitoring, you can accurately grasp the timing of sucking and the duration of sucking in time. When SpO2<90%, you can suck in time to keep the airway open. High concentration of oxygen was given before and after sucking. When sucking, pay attention to the patient's heart rate, blood pressure and SpO2 changes. If SpO2 drops to 85% when sucking, it should be suspended. After SpO2 rises, continue to attract, avoiding hypoxemia caused by continuous sucking time. If the high concentration oxygen is inhaled for more than 10 minutes after sucking, the SpO2 can't be restored to the original level. Check the location of the SpO2 monitor probe and whether the patient has lung function changes or sputum blocking the lower respiratory tract. If the sputum is sticky, it is not easy to attract. , can increase the number of ultrasonic atomization inhalation. 3 early detection of complications The application of SpO2 monitoring played a positive role in the observation of postoperative complications. In this group, there was one patient with radical operation for esophageal cancer. On the first day after surgery, the patient felt chest tightness, shortness of breath, and SpO2 reading dropped to below 90%. The chest tube is circulated smoothly. After the treatment, such as sucking and increasing the oxygen concentration, the reading still cannot be recovered. Immediately report to the doctor and consider the contralateral pleural effusion, resulting in limited gas exchange. That is, the chest drainage tube is placed at the bedside, and the water-sealed bottle is connected to the closed drainage to make the patient turn to safety. Clinically, the author has compared the SpO2 values ​​of several patients with the arterial oxygen saturation values. It is believed that the SpO2 readings can reflect the patient's respiratory function and reflect the changes of arterial blood oxygen to some extent. In patients with thoracic surgery, except for the clinical symptoms and values ​​of individual cases, blood gas analysis is required. Conventional application of pulse oximetry monitoring can provide meaningful indicators for clinical observation of disease changes, avoiding repeated blood collection and reducing nurses' The workload is worth promoting. 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