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
1600psiHf = 3.14 L/psiresidual 200 psiV = ? L

Practice exercise (made-up values, not clinical guidance). The gauge on a size H oxygen cylinder reads 1600 psi. Its cylinder factor is 3.14 L/psi. How many litres V can be used before the safe residual of 200 psi is reached?

1600 psif = 3.14 L/psi200 psi
V = L
2.Easy
60 s550 mLf = 18/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 18 times a minute with a tidal volume of 550 mL. Find the minute ventilation V̇E in L/min.

VT 550 mL18/min
V̇E = L/min
3.Medium
PaO₂ 110 mmHg · FiO₂ 0.3 · PEEP 6 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 110 mmHg (14.7 kPa) on 30% oxygen with a PEEP of 6 cmH₂O. Calculate the P/F ratio and click the ARDS severity.

PaO₂ 110 mmHg (14.7 kPa)FiO₂ 30%PEEP 6 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
4.Medium
PaO₂ 96 mmHg · FiO₂ 0.3 · PEEP 8 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 96 mmHg (12.8 kPa) on 30% oxygen with a PEEP of 8 cmH₂O. Calculate the P/F ratio and click the ARDS severity.

PaO₂ 96 mmHg (12.8 kPa)FiO₂ 30%PEEP 8 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
5.Hard
SpO₂ 93% · FiO₂ 0.8ROX = ?RR 23/minROX = (SpO₂/FiO₂)/RR

Practice exercise (made-up values, not clinical guidance). A patient on high-flow nasal oxygen has SpO₂ 93% on FiO₂ 0.8 and a respiratory rate of 23/min. Find the ROX index ROX = (SpO₂/FiO₂)/RR, with SpO₂ in percent and FiO₂ as a fraction. Round to two decimal places.

SpO₂ 93%FiO₂ 0.8RR 23/min
ROX =
6.Hard
PaO₂ 14.6 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 14.6 kPa on 35% oxygen with a PEEP of 8 cmH₂O. Grade the ARDS severity with the Berlin definition. Click your answer.

PaO₂ 14.6 kPaFiO₂ 35%PEEP 8 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
  5. 5not gradable: PEEP below 5

Answer key

  1. 1. V = 4396 L
  2. 2. V̇E = 9.9 L/min
  3. 3. above 300: no ARDS grade
  4. 4. above 300: no ARDS grade
  5. 5. ROX = 5.05
  6. 6. above 300: no ARDS grade

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