Monitoring

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SpO2 Monitoring

SpO2 refers to peripheral monitoring; SaO2 refers to aterial monitoring

Limitations of SpO2:

vascular dyes like methylene blue can lead to low readings

bright lights, edema, nail polish may interfere with the photodetector

incorrect placement may allow light to reach photodetector without passing though Hb

Abnormal Hb may falsely elevate spO2

https://infonet.nyp.org/Nursing/Standards/PulseOximetry.pdf

EtCO2 Monitoring

EtCO2: measures ventilation based on CO2 [ ] throughout the ventilatory cycle

Normal: PaCO2 may be 1 - 5 mmHg > PetCO2

PetCO2 (end tidal CO2) is a reliable alternative to PaCO2 (partial pressure of arterial CO2) in hemodynamically stable patients.

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