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
60 s670 mLf = 29/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 29 times a minute with a tidal volume of 670 mL. Find the minute ventilation V̇E in L/min.

VT 670 mL29/min
V̇E = L/min
2.Easy
0123456L/minQ = ? L/minFiO₂ ≈ 45%

Practice exercise (made-up values, not clinical guidance). The team wants an inspired oxygen of about 45% by nasal cannula. Using the rule of thumb FiO₂ ≈ 21% + 4% per L/min, what flow Q does it suggest? (Real FiO₂ varies with the patient's breathing.)

FiO₂ 45%
Q = L/min
3.Medium
PaO₂ 75 mmHg · FiO₂ 0.9 · PEEP 5 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 75 mmHg (10.0 kPa) on 90% oxygen with a PEEP of 5 cmH₂O. Calculate the P/F ratio and click the ARDS severity.

PaO₂ 75 mmHg (10.0 kPa)FiO₂ 90%PEEP 5 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
4.Medium
Hb119 g/LSaO₂97%PaO₂95 mmHgCaO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 119 g/L, SaO₂ 97% and PaO₂ 95 mmHg (12.7 kPa). Find the arterial oxygen content CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg) in mL O₂/dL.

Hb 119 g/LSaO₂ 97%PaO₂ 95 mmHg (12.7 kPa)
CaO₂ = mL/dL
5.Hard
PaO₂ 7.6 kPa · FiO₂ 0.35 · PEEP 6 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 7.6 kPa on 35% oxygen with a PEEP of 6 cmH₂O. Grade the ARDS severity with the Berlin definition. Click your answer.

PaO₂ 7.6 kPaFiO₂ 35%PEEP 6 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
  5. 5not gradable: PEEP below 5
6.Hard
PaO₂ 10 kPa · FiO₂ 0.8 · PEEP 4 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 10 kPa on 80% oxygen with a PEEP of 4 cmH₂O. Grade the ARDS severity with the Berlin definition. Click your answer.

PaO₂ 10 kPaFiO₂ 80%PEEP 4 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
  5. 5not gradable: PEEP below 5

Answer key

  1. 1. V̇E = 19.43 L/min
  2. 2. Q = 6 L/min
  3. 3. severe
  4. 4. CaO₂ = 15.75 mL/dL
  5. 5. moderate
  6. 6. not gradable: PEEP below 5

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