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
0123456L/minFiO₂ ≈ ?21% + 4%·L/min

Practice exercise (made-up values, not clinical guidance). A patient receives oxygen by nasal cannula at 2 L/min. Using FiO₂ ≈ 21% + 4% per L/min, estimate the inspired oxygen FiO₂ in percent.

2 L/min
FiO₂ = %
2.Easy
60 s630 mLf = 28/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 28 times a minute with a tidal volume of 630 mL. Find the minute ventilation V̇E in L/min.

VT 630 mL28/min
V̇E = L/min
3.Medium
500psiEf = 0.28 L/psi8 L/minresidual 200 psit = ? min

Practice exercise (made-up values, not clinical guidance). A size E oxygen cylinder (factor 0.28 L/psi) reads 500 psi and runs at 8 L/min. Keeping a safe residual of 200 psi, how many minutes t will it last? Round down to a whole minute.

500 psif = 0.28 L/psi8 L/min200 psi
t = min
4.Medium
60 s360 mLf = 10/min · V̇A = ?VD​ = 180 mL

Practice exercise (made-up values, not clinical guidance). A patient breathes 10 times a minute with a tidal volume of 360 mL. The anatomical dead space is 180 mL. Find the alveolar ventilation V̇A in L/min.

VT 360 mL10/minVD 180 mL
V̇A = L/min
5.Hard
PaO₂ 15.8 kPa · FiO₂ 0.35 · PEEP 8 cmH₂O0100200300400500P/F (mmHg)above 300: no ARDS grademildmoderateseverenot gradable: PEEP below 5

Practice exercise (made-up values, not clinical guidance). A patient with acute hypoxaemia and bilateral opacities, not explained by heart failure, has PaO₂ 15.8 kPa on 35% oxygen with a PEEP of 8 cmH₂O. Grade the ARDS severity with the Berlin definition. Click your answer.

PaO₂ 15.8 kPaFiO₂ 35%PEEP 8 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
  5. 5not gradable: PEEP below 5
6.Hard
1050psiEf = 0.28 L/psi20 minresidual 200 psiQ = ? L/min

Practice exercise (made-up values, not clinical guidance). A transfer will take 20 minutes. The size E cylinder (factor 0.28 L/psi) reads 1050 psi. Keeping a safe residual of 200 psi, what is the highest whole-number flow Q in L/min that lasts the whole transfer?

20 min1050 psif = 0.28 L/psi200 psi
Q = L/min

Answer key

  1. 1. FiO₂ = 29 %
  2. 2. V̇E = 17.64 L/min
  3. 3. t = 10 min
  4. 4. V̇A = 1.8 L/min
  5. 5. above 300: no ARDS grade
  6. 6. Q = 11 L/min

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