How to monitor blood oxygen saturation？
Nose or forehead can detect human blood oxygen saturation
The nose is hollow and thin, which helps to identify the blood oxygen of the SpO2 sensor extension cable. However, the nasal oxygen saturation probe is relatively expensive and can be used as an auxiliary probe.
The forehead position is more advantageous than other positions because it is not easily affected by the position of the receptor and the movement of the limbs, and it is easy to fix. However, because the forehead probe is relatively expensive, it is usually recommended for patients who require exercise.
Note when using spo2 sensor extension cables
1. The patient’s nails should not be too long and must not contain any stains, dirt or nails.
2. If the patient’s finger feels uncomfortable after prolonged blood oxygen monitoring, another finger should be replaced for monitoring.
3. During the monitoring process, if the patient and the medical staff collide and pull the spo2 probe and wire, interference will occur. It is recommended that the patient stay quiet and then read the value more accurately.
Blood oxygen saturation detection classification
The traditional electrochemical method of measuring oxygen saturation uses a disposable Spo2 sensor to first collect blood from the human body (the most commonly used is to collect arterial blood), and then use a blood gas analyzer for electrochemical analysis, and measure the arterial oxygen within a few minutes Pressure (PaO2). Calculate arterial oxygen saturation (SaO2). Because this method requires arterial puncture or intubation, it will cause pain to the patient and cannot be continuously monitored. Therefore, it is difficult for the patient to receive treatment in a dangerous situation. The advantage of the electrochemical method is that the measurement result is accurate and reliable, but the disadvantage is that it is troublesome and cannot be continuously monitored. It is a method for measuring blood oxygen saturation.
The optical method is a new optical measurement method that overcomes the shortcomings of the electrochemical method. It is a continuous non-invasive blood oxygen measurement method that can be used in emergency rooms, operating rooms, recovery rooms and sleep studies. The principle is to detect changes in blood absorption of blood and measure the percentage of oxyhemoglobin (HbO2) in total hemoglobin (Hb). Obtain SpO2. The advantage of this method is that it can continuously measure the human body without being damaged, and the instrument is simple and easy to use, so it has attracted more and more attention. The disadvantage is that the measurement accuracy is lower than the electrochemical method, and the error caused by the lower blood oxygen value is larger. Ear oximeters, multi-wavelength oximeters and newly introduced pulse oximeters have appeared. The measurement error of the latest pulse oximeter can be controlled within 1% to meet the requirements of clinical use. Although they are unsatisfactory in some respects, their clinical benefits have been widely recognized.
Post time: Oct-26-2020