Abstract
Pulse oximetry is a noninvasive method by which arterial oxygenation can be approximated, and it has allowed anesthesiologists to rapidly detect and treat acute decreases in oxygen saturation. As with all monitors, understanding both the methods of operation and the limitations of pulse oximeters is critical to the delivery of safe care. Pulse oximeters can give falsely high and low numbers and it is important to understand the reasons why that is so. Oxygenation and ventilation are separate processes, and pulse oximetry does not assess the adequacy of ventilation. Pulse oximetry can also be used to predict fluid responsiveness and to assess volume status.
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