FP-C Equations & Formulas
Question 1: Original PO2 given barometric pressure O2
Concentration (0.21) x Barometric pressure Sea level=760 torr
CORRECT ANSWER: 0.21 x 760 = 159 torr
Question 2: Percentage of O2 required at higher altitudes (i.e. if
my FiO2 is 0.3 at 10,000 feet, what do I need to increase my
FiO2 to at 20,000?) (%FiO2 x Current barometric pressure) /
New barometric pressure
CORRECT ANSWER: 10,000-20,000 feet: (0.3 x 523) / 349 =
0.44 (New FiO2)
Question 3: Potential PO2 FiO2 x 5 = Potential FiO2
CORRECT ANSWER: 0.21 x 5 = 105 (Normal)
Question 4: PaO2/FiO2 Ratio Ratio of arterial oxygen partial
pressure to fractional inspired oxygen
CORRECT ANSWER: Used to distinguish ARDS severity
Question 5: Pediatric ETT size
CORRECT ANSWER: (16+age) / 4
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