Pulse oximetry
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Exploring Pulse Oximetry for Oxygen Level Monitoring
Understanding Pulse Oximetry
Pulse oximetry provides insights into a patient's oxygen levels by measuring oxygen combined with circulating haemoglobin.
Accuracy Considerations
Factors Affecting Accuracy
- Cold Conditions: Low temperatures can affect sensor accuracy.
- Raynaud's Syndrome: Conditions impacting distal body circulation may yield inaccurate readings.
- Carbon Monoxide Poisoning: Pulse oximetry cannot distinguish between oxygen and carbon monoxide.
Pulse Oximetry Devices
Overview of Pulse Oximeters
Pulse oximeters come in various configurations, typically featuring a screen for displaying readings and a sensor applied to the patient's finger.
Quick Response
Immediate Oxygen Therapy
If dealing with a hypoxic patient, initiate oxygen therapy without waiting for the pulse oximetry reading to confirm hypoxia. Oxygen dosage can be adjusted later based on the reading.
Target Oxygen Saturation Levels
Desired SPO2 Levels
In patients with chronic obstructive pulmonary disease (COPD), an oxygen saturation range of 88% to 92% is acceptable. For patients without COPD, aim for an SPO2 reading above 95%.
How Pulse Oximetry Works
Principles of the Pulse Oximetry Probe
The pulse oximetry probe emits red light through the finger, detecting the amount of oxyhemoglobin as it passes through the light. When dealing with nail varnish, consider applying the sensor sideways for accuracy. Alternative probes can be used on ears, noses, toes, providing insight into distal circulatory status.