HEMOGLOBIN DISSOCIATION CURVE
In its basic form, the oxyhemoglobin dissociation curve describes the relation between the partial pressure of oxygen (x axis) and the oxygen saturation (y axis). The curve has a sigmoidal or S-shape. At pressures above about 60 mmHg, the standard dissociation curve is relatively flat, which means that the oxygen content of the blood does not change significantly even with large increases in the oxygen partial pressure.
|
97% saturation = 97 PaO2 (normal)
|
|
90% saturation = 60 PaO2 (danger)
|
|
80% saturation = 45 PaO2 (dangerous hypoxemia)
|
