Oxygen therapy & respiratory calculations worksheet with answers

Free printable Oxygen therapy & respiratory calculations worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy
2200psiDf = 0.16 L/psiresidual 200 psiV = ? L

Practice exercise (made-up values, not clinical guidance). The gauge on a size D oxygen cylinder reads 2200 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?

2200 psif = 0.16 L/psi200 psi
V = L
2.Easy
60 s730 mLf = 29/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 29 times a minute with a tidal volume of 730 mL. Find the minute ventilation V̇E in L/min.

VT 730 mL29/min
V̇E = L/min
3.Medium
1800psiEf = 0.28 L/psi10 L/minresidual 200 psit = ? min

Practice exercise (made-up values, not clinical guidance). A size E oxygen cylinder (factor 0.28 L/psi) reads 1800 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.

1800 psif = 0.28 L/psi10 L/min200 psi
t = min
4.Medium
PaO₂ 92 mmHg · FiO₂ 0.3 · PEEP 12 cmH₂O0100200300400500P/F (mmHg)above 300: no ARDS grademildmoderatesevere

Practice exercise (made-up values, not clinical guidance). A ventilated patient who meets the other Berlin criteria for ARDS has PaO₂ 92 mmHg (12.3 kPa) on 30% oxygen with a PEEP of 12 cmH₂O. Calculate the P/F ratio and click the ARDS severity.

PaO₂ 92 mmHg (12.3 kPa)FiO₂ 30%PEEP 12 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
5.Hard
Hb144 g/LSaO₂91%PaO₂60 mmHgCaO₂mL/dL× CO4.5 L/minDO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 144 g/L, SaO₂ 91%, PaO₂ 60 mmHg (8.0 kPa) and a cardiac output of 4.5 L/min. With CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg), find the oxygen delivery DO₂ = CaO₂ × CO × 10 in mL/min.

Hb 144 g/LSaO₂ 91%PaO₂ 60 mmHg (8.0 kPa)CO 4.5 L/min
DO₂ = mL/min
6.Hard
950psiDf = 0.16 L/psi90 minresidual 200 psiQ = ? L/min

Practice exercise (made-up values, not clinical guidance). A transfer will take 90 minutes. The size D cylinder (factor 0.16 L/psi) reads 950 psi. Keeping a safe residual of 200 psi, what is the highest whole-number flow Q in L/min that lasts the whole transfer?

90 min950 psif = 0.16 L/psi200 psi
Q = L/min

Answer key

  1. 1. V = 320 L
  2. 2. V̇E = 21.17 L/min
  3. 3. t = 44 min
  4. 4. above 300: no ARDS grade
  5. 5. DO₂ = 798.3 mL/min
  6. 6. Q = 1 L/min

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