Oxygen therapy & respiratory calculations worksheet with answers

Practice exercise (made-up values, not clinical guidance). A patient breathes 31 times a minute with a tidal volume of 400 mL. Find the minute ventilation V̇E in L/min.

Practice exercise (made-up values, not clinical guidance). The gauge on a size E oxygen cylinder reads 1000 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?

Practice exercise (made-up values, not clinical guidance). A patient has Hb 123 g/L, SaO₂ 98% and PaO₂ 103 mmHg (13.7 kPa). Find the arterial oxygen content CaO₂ = 1.34 × Hb (g/dL) × SaO₂ + 0.003 × PaO₂ (mmHg) in mL O₂/dL.

Practice exercise (made-up values, not clinical guidance). A patient breathes 19 times a minute with a tidal volume of 360 mL. The anatomical dead space is 120 mL. Find the alveolar ventilation V̇A in L/min.

Practice exercise (made-up values, not clinical guidance). A transfer will take 60 minutes. The size D cylinder (factor 0.16 L/psi) reads 2000 psi. Keeping a safe residual of 200 psi, what is the highest whole-number flow Q in L/min that lasts the whole transfer?

Practice exercise (made-up values, not clinical guidance). A cylinder with a water capacity of 3 L is filled to 83 bar and runs at 6 L/min. The gas volume is about the water capacity × the pressure. In this exercise the cylinder is changed at 20 bar. How many minutes t until it must be changed? Round down to a whole minute.