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
60 s460 mLf = 12/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 12 times a minute with a tidal volume of 460 mL. Find the minute ventilation V̇E in L/min.

VT 460 mL12/min
V̇E = L/min
2.Easy
60 s660 mLf = 10/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 10 times a minute with a tidal volume of 660 mL. Find the minute ventilation V̇E in L/min.

VT 660 mL10/min
V̇E = L/min
3.Medium
Hb95 g/LSaO₂96%PaO₂79 mmHgCaO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 95 g/L, SaO₂ 96% and PaO₂ 79 mmHg (10.5 kPa). Find the arterial oxygen content CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg) in mL O₂/dL.

Hb 95 g/LSaO₂ 96%PaO₂ 79 mmHg (10.5 kPa)
CaO₂ = mL/dL
4.Medium
Hb79 g/LSaO₂92%PaO₂65 mmHgCaO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 79 g/L, SaO₂ 92% and PaO₂ 65 mmHg (8.7 kPa). Find the arterial oxygen content CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg) in mL O₂/dL.

Hb 79 g/LSaO₂ 92%PaO₂ 65 mmHg (8.7 kPa)
CaO₂ = mL/dL
5.Hard
77 kg152 cm♀4 mL/kg PBWVT​ = ? mL

Practice exercise (made-up values, not clinical guidance). A ventilated woman is 152 cm tall and weighs 77 kg. Lung-protective ventilation is set at 4 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.

152 cm77 kg4 mL/kg
VT = mL
6.Hard
PaO₂ 17.3 kPa · FiO₂ 0.5 · PEEP 5 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 17.3 kPa on 50% oxygen with a PEEP of 5 cmH₂O. Grade the ARDS severity with the Berlin definition. Click your answer.

PaO₂ 17.3 kPaFiO₂ 50%PEEP 5 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
  5. 5not gradable: PEEP below 5

Answer key

  1. 1. V̇E = 5.52 L/min
  2. 2. V̇E = 6.6 L/min
  3. 3. CaO₂ = 12.46 mL/dL
  4. 4. CaO₂ = 9.934 mL/dL
  5. 5. VT = 181 mL
  6. 6. mild

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