Nellcor OXIMAX N-600X Series, Руководство оператора, Страница: 182 / 212

Principles of Operation
174 N-600x Operator’s Manual
Measured versus Calculated Saturation
When saturation is calculated from a blood gas partial pressure of
oxygen (PO
2
), the calculated value may differ from the SpO
2
measurement of a pulse oximeter. This usually occurs because the
calculated saturation was not properly corrected for the effects of
variables that shift the relationship between PO
2
and pH, temperature,
the partial pressure of carbon dioxide (PCO
2
), 2,3-DPG, and fetal
hemoglobin. See Figure 12.
Figure 12: Oxyhemoglobin Dissociation Curve