6/1/2023 0 Comments Why spo2 is importntEach Hgb molecule, if fully saturated, can bind four oxygen molecules. Hemoglobin is a chemical molecule in the red blood cell (RBC) that carries oxygen on specific binding sites. Oxygen saturation is the percent of Hemoglobin (Hgb) binding sites in the blood that are carrying oxygen. Some of the material below is from my book Anyone Can Intubate. This is such a key concept that we all must take pains to ensure our staff understands how to use this valuable monitoring tool. One study of pediatric nurses showed that while 84% of the clinicians felt they had received adequate training, only 40% correctly identified how a pulse oximeter worked, and only 15% had a correct understanding of the oxyhemoglobin dissociation curve. Many RNs do not understand the important difference between oxygen saturation and PaO2. Multiple studies have identified this as a knowledge gap. Hypoxemia and hypoxia occur commonly among our perioperative patients so I spend a lot of time on recognizing early signs of respiratory distress such as tachycardia, tachypnea, cyanosis, agitation, and changes in mental status. I often teach classes for RNs who are orienting to our preoperative and recovery areas. I find that one frequent area of confusion relates to understanding the important difference between arterial partial pressure of oxygen (PaO2) and oxygen saturation (O2 sat). Pulse oximetry is one obvious monitoring tool to identify hypoxemia and hypoxia.
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