Oxygen Delivery Explained: PaO₂, SaO₂, Hemoglobin, and the Curve
Oxygen saturation does not equal oxygen delivery — and misunderstanding this concept leads to frequent clinical mistakes. In this video, we break down PaO₂ vs SaO₂, oxygen content, hemoglobin physiology, and the oxyhemoglobin dissociation curve, tying core physiology directly to bedside interpretation.
We start by defining oxygen content and explaining the differences between arterial and venous oxygenation. We then review capillary gas exchange, dissolved oxygen (PaO₂), oxygen saturation (SaO₂ and SpO₂), and how hemoglobin structure and binding influence oxygen delivery.
Using these principles, we walk step by step through the oxyhemoglobin dissociation curve, including normal physiology, right and left shifts, the Bohr effect, and common clinical scenarios where oxygen saturation can be misleading.
Timestamps are included below to help navigate each section.
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Introduction to Capillary Gas Exchange, Arterial vs Venous Systems, Oxygen Content: 0:00 - 6:11
Defining Oxygen Content, Oxygen Saturation (SaO2, SpO2), Dissolved Oxygen (PaO2): 6:12 - 12:48
Red Blood Cells, Hemoglobin Structure (subunits), Oxygen Binding Capacity, Tense vs Relaxed, Lung Tissue Interface: 12:49 - 20:01
Relationship Between SaO2 (SpO2) and PaO2 or Oxygen Saturation and Dissolved Oxygen: 20:02 - 24:17
Normal Oxyhemoglobin Dissociation Curve: 24:18 - 28:54
Right Shift, Left Shift, Bohr's Law, Bringing it all Together: 28:55 - 37:35
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DISCLAIMER THIS VIDEO DOES NOT PROVIDE MEDICAL ADVICE. The information, including but not limited to, text, graphics, images and other material contained on this website are for informational purposes only. No material on this site is intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of your physician or other qualified health care provider with any questions you may have regarding a medical condition or treatment and before undertaking a new health care regimen, and never disregard professional medical advice or delay in seeking it because of something you have read, watched, or listened to on this video, or any other videos, reports, texts tweets or other sources.
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