Oxygen Delivery Devices. they’re not what you think. Indications for oxygen use. Low ambient O 2 Hypoxemia Suspected hypoxemia Increased work-of-breathing Flaring Tachypnea Increased myocardial work Acute head injury. O 2 delivery systems. High-flow
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they’re not what you think
PaO2 = FiO2 x (barometric pressure - water vapor pressure) - PaCO2/RQ
PaO2 = FiO2 X (760 - 43) - PaCO2/0.8
a: PaO2 = .21 X 713 - 40/0.8 = 100
b: PaO2 = .50 X 713 - 40/0.8 = 306
c: PaO2 = .80 X 713 - 40/0.8 = 520
After ~15 minutes,
blood N2 is depleted.
Poorly ventilated &
well perfused units (A)
PCO2 = 40
PH2O = 47
One way valves
room airAir entrainment devices
ph = 7.4, pO2 = 100, sat 96%
ph = 7.0, pO2 = ?, sat = ?
DO2 = 1.38(hgb X sat X CI)
+ (pO2 X 0.003)