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Oxygenation. “Part of the Dumb-It-Down Lecture Series”. How do we support a patient’s pulmonary function?. Oxygenation Nasal Cannula Mask/ Venti -Mask Partial Non- Rebreather /Full Non- Rebreather Supplemental O2 given through a device helping maintain ventilation Ventilation Ambu -bag
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Oxygenation “Part of the Dumb-It-Down Lecture Series”
How do we support a patient’s pulmonary function? • Oxygenation • Nasal Cannula • Mask/Venti-Mask • Partial Non-Rebreather/Full Non-Rebreather • Supplemental O2 given through a device helping maintain ventilation • Ventilation • Ambu-bag • Mouth to Mouth • BiPAP/CPAP • Invasive Mechanical Ventilation
Why isn’t 100% FiO2 Achieved? • Normal Flow Rate is 25L/min, so if a nasal cannula is delivering 2L/min… FiO2 = [(% of flow from NC) + (% of flow from RA)]/ total flow FiO2 = [(2)(1) + (23)(0.21)]/25 = 0.27
Why isn’t 100% FiO2 Achieved? But the percent of flow obtained from the nasal cannula is variable…
When is Pulse Oximetry Wrong? • Carbon Dioxide/Cyanide (falsely high) • Nail Polish (falsely low) • Methemoglobinemia (falsely low) • Hypoxia (falsely low) • Hypotension (wont pick up arterial pulsations)
Pulse Oximetry is not PaO2 The 40-50-60, 70-80-90 Rule: