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 s740 mLf = 9/min · V̇E = ?

Practice exercise (made-up values, not clinical guidance). A patient breathes 9 times a minute with a tidal volume of 740 mL. Find the minute ventilation V̇E in L/min.

VT 740 mL9/min
V̇E = L/min
2.Easy
0123456L/minFiO₂ ≈ ?21% + 4%·L/min

Practice exercise (made-up values, not clinical guidance). A patient receives oxygen by nasal cannula at 5 L/min. Using FiO₂ ≈ 21% + 4% per L/min, estimate the inspired oxygen FiO₂ in percent.

5 L/min
FiO₂ = %
3.Medium
Hb168 g/LSaO₂95%PaO₂78 mmHgCaO₂?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 168 g/L, SaO₂ 95% and PaO₂ 78 mmHg (10.4 kPa). Find the arterial oxygen content CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg) in mL O₂/dL.

Hb 168 g/LSaO₂ 95%PaO₂ 78 mmHg (10.4 kPa)
CaO₂ = mL/dL
4.Medium
PaO₂ 109 mmHg · FiO₂ 0.3 · PEEP 10 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 109 mmHg (14.5 kPa) on 30% oxygen with a PEEP of 10 cmH₂O. Calculate the P/F ratio and click the ARDS severity.

PaO₂ 109 mmHg (14.5 kPa)FiO₂ 30%PEEP 10 cmH₂O
  1. 1above 300: no ARDS grade
  2. 2mild
  3. 3moderate
  4. 4severe
5.Hard
1000psiEf = 0.28 L/psi90 minresidual 200 psiQ = ? L/min

Practice exercise (made-up values, not clinical guidance). A transfer will take 90 minutes. The size E cylinder (factor 0.28 L/psi) reads 1000 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 min1000 psif = 0.28 L/psi200 psi
Q = L/min
6.Hard
2100psiDf = 0.16 L/psi120 minresidual 200 psiQ = ? L/min

Practice exercise (made-up values, not clinical guidance). A transfer will take 120 minutes. The size D cylinder (factor 0.16 L/psi) reads 2100 psi. Keeping a safe residual of 200 psi, what is the highest whole-number flow Q in L/min that lasts the whole transfer?

120 min2100 psif = 0.16 L/psi200 psi
Q = L/min

Answer key

  1. 1. V̇E = 6.66 L/min
  2. 2. FiO₂ = 41 %
  3. 3. CaO₂ = 21.62 mL/dL
  4. 4. above 300: no ARDS grade
  5. 5. Q = 2 L/min
  6. 6. Q = 2 L/min

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