A 48-year-old man on ICU with severe community-acquired pneumonia has the following ABG on FiO2 0.6: pH 7.32, PaO2 7.5 kPa, PaCO2 3.5 kPa, HCO3 14 mmo...

Question

A 48-year-old man on ICU with severe community-acquired pneumonia has the following ABG on FiO2 0.6: pH 7.32, PaO2 7.5 kPa, PaCO2 3.5 kPa, HCO3 14 mmol/L, BE -10, lactate 4.8 mmol/L. What is the PaO2/FiO2 ratio (in mmHg) and what severity of ARDS does this represent?

Accepted Answer

PaO2/FiO2 = 94 mmHg - severe ARDS

Answer

PaO2/FiO2 = 150 mmHg - moderate ARDS

Answer

PaO2/FiO2 = 225 mmHg - mild ARDS

Answer

PaO2/FiO2 = 300 mmHg - not ARDS

Answer

Cannot calculate without PEEP information

uk-fficm MCQ (SBA): ARDS Classification

A 48-year-old man on ICU with severe community-acquired pneumonia has the following ABG on FiO2 0.6: pH 7.32, PaO2 7.5 kPa, PaCO2 3.5 kPa, HCO3 14 mmol/L, BE -10, lactate 4.8 mmol/L. What is the PaO2/FiO2 ratio (in mmHg) and what severity of ARDS does this represent?