E7 - Non-Invasive Monitoring

Question 1

what is the best way to evaluate oxygenation & ventilation?

Answer 1

Arterial blood gas

Question 2

Name indications for pulse oximetry

Answer 2

1. Prolonged continuous O2 monitoring
2. Warning of hypoxic events
3. Spot check for oxygentation

Question 3

Name limitations for pulse oximetry

Answer 3

1. No pH evaluation
2. No PaCO2 calculation
3. Poor in detecting hyperoxemia

Question 4

Name potential errors for pulse oximetry

Answer 4

• motion artifact
• nail polish
• ambient light
• skin pigmentation
• dyshemoglobin species (derivatives)
• severity of hypo & hyperoxemia
• intervascular dyes/pigments

Question 5

Name 3 layers of skin for PtcO2

Answer 5

1. stratum corneum -> diffusion membrane
2. epidermis -> no blood vessels, high O2 consumption
3. dermis -> low O2 consumption, provides blood and O2 to epidermis