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 s380 mLf = 12/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 12 times a minute with a tidal volume of 380 mL. Find the minute ventilation V̇E in L/min.

VT 380 mL12/min
V̇E = L/min
2.Easy
2000psiEf = 0.28 L/psiresidual 200 psiV = ? L

Practice exercise (made-up values, not clinical guidance). The gauge on a size E oxygen cylinder reads 2000 psi. Its cylinder factor is 0.28 L/psi. How many litres V can be used before the safe residual of 200 psi is reached?

2000 psif = 0.28 L/psi200 psi
V = L
3.Medium
60 s520 mLf = 15/min · V̇A = ?VD​ = 160 mL

Practice exercise (made-up values, not clinical guidance). A patient breathes 15 times a minute with a tidal volume of 520 mL. The anatomical dead space is 160 mL. Find the alveolar ventilation V̇A in L/min.

VT 520 mL15/minVD 160 mL
V̇A = L/min
4.Medium
1750psiEf = 0.28 L/psi4 L/minresidual 200 psit = ? min

Practice exercise (made-up values, not clinical guidance). A size E oxygen cylinder (factor 0.28 L/psi) reads 1750 psi and runs at 4 L/min. Keeping a safe residual of 200 psi, how many minutes t will it last? Round down to a whole minute.

1750 psif = 0.28 L/psi4 L/min200 psi
t = min
5.Hard
900psiDf = 0.16 L/psi90 minresidual 200 psiQ = ? L/min

Practice exercise (made-up values, not clinical guidance). A transfer will take 90 minutes. The size D cylinder (factor 0.16 L/psi) reads 900 psi. Keeping a safe residual of 200 psi, what is the highest whole-number flow Q in L/min that lasts the whole transfer?

90 min900 psif = 0.16 L/psi200 psi
Q = L/min
6.Hard
Hb134 g/LSaO₂97%PaO₂92 mmHgCaO₂mL/dL× CO3.4 L/minDO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 134 g/L, SaO₂ 97%, PaO₂ 92 mmHg (12.3 kPa) and a cardiac output of 3.4 L/min. With CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg), find the oxygen delivery DO₂ = CaO₂ × CO × 10 in mL/min.

Hb 134 g/LSaO₂ 97%PaO₂ 92 mmHg (12.3 kPa)CO 3.4 L/min
DO₂ = mL/min

Answer key

  1. 1. V̇E = 4.56 L/min
  2. 2. V = 504 L
  3. 3. V̇A = 5.4 L/min
  4. 4. t = 108 min
  5. 5. Q = 1 L/min
  6. 6. DO₂ = 601.6 mL/min

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