Practice exercise (made-up values, not clinical guidance). The team wants an inspired oxygen of about 25% 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 patient receives oxygen by nasal cannula at 4 L/min. Using FiO₂ ≈ 21% + 4% per L/min, estimate the inspired oxygen FiO₂ in percent.
Practice exercise (made-up values, not clinical guidance). A patient has Hb 141 g/L, SaO₂ 94% and PaO₂ 69 mmHg (9.2 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 has Hb 152 g/L, SaO₂ 94% and PaO₂ 70 mmHg (9.3 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 has Hb 97 g/L, SaO₂ 98%, PaO₂ 100 mmHg (13.3 kPa) and a cardiac output of 6 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.
Practice exercise (made-up values, not clinical guidance). A patient with acute hypoxaemia and bilateral opacities, not explained by heart failure, has PaO₂ 9.1 kPa on 40% oxygen with a PEEP of 4 cmH₂O. Grade the ARDS severity with the Berlin definition. Click your answer.
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