Practice exercise (made-up values, not clinical guidance). The gauge on a size D oxygen cylinder reads 1450 psi. Its cylinder factor is 0.16 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). The team wants an inspired oxygen of about 45% by nasal cannula. Using the rule of thumb FiO₂ ≈ 21% + 4% per L/min, what flow Q does it suggest? (Real FiO₂ varies with the patient's breathing.)
Practice exercise (made-up values, not clinical guidance). A size H oxygen cylinder (factor 3.14 L/psi) reads 1550 psi and runs at 2 L/min. Keeping a safe residual of 200 psi, how many minutes t will it last? Round down to a whole minute.
Practice exercise (made-up values, not clinical guidance). A patient breathes 24 times a minute with a tidal volume of 460 mL. The anatomical dead space is 180 mL. Find the alveolar ventilation V̇A in L/min.
Practice exercise (made-up values, not clinical guidance). A cylinder with a water capacity of 3 L is filled to 171 bar and runs at 12 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.
Practice exercise (made-up values, not clinical guidance). A transfer will take 45 minutes. The size D cylinder (factor 0.16 L/psi) reads 850 psi. Keeping a safe residual of 200 psi, what is the highest whole-number flow Q in L/min that lasts the whole transfer?
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