PULSE-OXIMETER: IT PROVIDES INFORMATION ABOUT THE TRANSPORT OF OXYGEN IN THE BLOOD
- It determines how much of the haemoglobin in arterial blood is saturated with oxygen (SpO2);
- The saturation of haemoglobin in the blood of a patient in normal conditions has a range of 95-99%;
- Knowing the positioning of the probe, common reading problems and elements that affect it provides enormous help in monitoring vital parameters during anaesthesia.
POLSE-OXIMETRY
Pulse oximetry is a simple, non-invasive method of reading blood oxygen saturation. ?
? It also continuously measures heart rate and uses a light absorption technique to determine how much of the hemoglobin in arterial blood is saturated with oxygen (SpO2).
?For example, if an SpO2 reading is 97%, it means 97% of the red blood cells read by the probe had fully saturated oxygen hemoglobin molecules and 3% did not.
A value below 95% indicates hypoxemia.
✔Position: on a pigment-free tissue where skin contact can be made: mucous membranes such as the tongue and lip are used, but the foreskin, vulva, ear or space between the fingertips.
✔ Reading problems during anaesthesia (usually detects lower data) can be caused by:
- Hypotension (always monitor blood pressure);
- Drugs used for sedation (such as alpha 2-agonists);
- Vasoconstriction;
- Movement.
✔Limitations:
A limitation in SpO2 readings occurs in anemic animals where there are fewer but completely saturated red blood cells giving a normal SpO2, but overall there is still a reduced oxygen transport capacity because there is less hemoglobin. We also remind you that it does not provide any data on Co2 saturation.
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