Practice exercise (made-up values, not clinical guidance). The gauge on a size D oxygen cylinder reads 750 psi. Its cylinder factor is 0.16 L/psi. How many litres V can be used before the safe residual of 200 psi is reached?
Practice exercise (made-up values, not clinical guidance). A patient receives oxygen by nasal cannula at 3 L/min. Using FiO₂ ≈ 21% + 4% per L/min, estimate the inspired oxygen FiO₂ in percent.
Practice exercise (made-up values, not clinical guidance). A size E oxygen cylinder (factor 0.28 L/psi) reads 1300 psi and runs at 10 L/min. Keeping a safe residual of 200 psi, how many minutes t will it last? Round down to a whole minute.
Practice exercise (made-up values, not clinical guidance). A patient has Hb 175 g/L, SaO₂ 91% and PaO₂ 60 mmHg (8.0 kPa). Find the arterial oxygen content CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg) in mL O₂/dL.
Practice exercise (made-up values, not clinical guidance). A patient on high-flow nasal oxygen has SpO₂ 94% on FiO₂ 0.7 and a respiratory rate of 25/min. Find the ROX index ROX = (SpO₂/FiO₂)/RR, with SpO₂ in percent and FiO₂ as a fraction. Round to two decimal places.
Practice exercise (made-up values, not clinical guidance). A patient on high-flow nasal oxygen has SpO₂ 94% on FiO₂ 0.45 and a respiratory rate of 34/min. Find the ROX index ROX = (SpO₂/FiO₂)/RR, with SpO₂ in percent and FiO₂ as a fraction. Round to two decimal places.
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