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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Name: ____________________   Date: ____________

1.Easy
1550psiHf = 3.14 L/psiresidual 200 psiV = ? L

Practice exercise (made-up values, not clinical guidance). The gauge on a size H oxygen cylinder reads 1550 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?

1550 psif = 3.14 L/psi200 psi
V = L
2.Easy
60 s710 mLf = 18/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 18 times a minute with a tidal volume of 710 mL. Find the minute ventilation V̇E in L/min.

VT 710 mL18/min
V̇E = L/min
3.Medium
Hb157 g/LSaO₂98%PaO₂105 mmHgCaO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 157 g/L, SaO₂ 98% and PaO₂ 105 mmHg (14.0 kPa). Find the arterial oxygen content CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg) in mL O₂/dL.

Hb 157 g/LSaO₂ 98%PaO₂ 105 mmHg (14.0 kPa)
CaO₂ = mL/dL
4.Medium
60 s370 mLf = 21/min · V̇A = ?VD​ = 150 mL

Practice exercise (made-up values, not clinical guidance). A patient breathes 21 times a minute with a tidal volume of 370 mL. The anatomical dead space is 150 mL. Find the alveolar ventilation V̇A in L/min.

VT 370 mL21/minVD 150 mL
V̇A = L/min
5.Hard
107 kg181 cm♀6 mL/kg PBWVT​ = ? mL

Practice exercise (made-up values, not clinical guidance). A ventilated woman is 181 cm tall and weighs 107 kg. Lung-protective ventilation is set at 6 mL per kg of predicted body weight. Using PBW = 45.5 + 0.91 × (height cm − 152.4) kg, find the tidal volume VT to the nearest mL.

181 cm107 kg6 mL/kg
VT = mL
6.Hard
PaO₂ 14.4 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 14.4 kPa on 80% oxygen with a PEEP of 4 cmH₂O. Grade the ARDS severity with the Berlin definition. Click your answer.

PaO₂ 14.4 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. V = 4239 L
  2. 2. V̇E = 12.78 L/min
  3. 3. CaO₂ = 20.93 mL/dL
  4. 4. V̇A = 4.62 L/min
  5. 5. VT = 429 mL
  6. 6. not gradable: PEEP below 5

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