How Pulse Oximetry Works — Beer–Lambert Law, R Value, Errors & Clinical Tips
Автор: Dr.Fraser
Загружено: 2025-11-22
Просмотров: 43
Pulse oximetry is an essential tools in medicine — but few people truly understand how it works or what its limitations are. In this video, we break down the physics, engineering, and clinical interpretation behind the pulse oximeter, including the Beer–Lambert law, R value calculation, accuracy limits, plethysmograph interpretation, and all major sources of error.
You’ll learn:
0:05 What is a Pulse Oximeter?
1:30 Beer - Lambert Law
3:27 How a Pulse Oximeter measures oxygenated haemoglobin?
4:49 What is the Isobestic point?
5:14 What is the R-Value?
7:13 What is Signal to Noise Ratio?
8:59 Source of Error
9:46 Why does carboxyhemoglobin give you a falsely high SpO2?
11:17 Why does methaemoglobin cause SpO2 to read closer to 85%?
11:43 Pulse Oximeter does not tell you your patient is ventilating and breathing!
Whether you're a medical student, anaesthetic trainee, ICU clinician, paramedic, or someone fascinated by medical physics, this video gives you a complete, clear explanation of how pulse oximetry works — and how to avoid common misinterpretations.
If you found this helpful, hit subscribe to support the channel and get more physiology, anaesthesia, and critical care breakdowns!
#PulseOximetry #medicaleducation #anaesthesia
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