A 62-year-old man is ventilated on ICU. The team wishes to determine whether the patient's respiratory failure is primarily due to shunt or V/Q mismat...

Question

A 62-year-old man is ventilated on ICU. The team wishes to determine whether the patient's respiratory failure is primarily due to shunt or V/Q mismatch. The patient is placed on FiO2 1.0 for 20 minutes. ABG shows PaO2 22 kPa. What does this response to 100% oxygen indicate?

Accepted Answer

The hypoxia is primarily due to V/Q mismatch - PaO2 responds well to supplemental O2

Answer

The hypoxia is primarily due to true shunt - PaO2 does not correct with 100% O2

Answer

The patient has diffusion impairment

Answer

The ABG machine is malfunctioning

Answer

The patient has hypoventilation as the cause

uk-fficm MCQ (SBA): Shunt vs V/Q Mismatch

A 62-year-old man is ventilated on ICU. The team wishes to determine whether the patient's respiratory failure is primarily due to shunt or V/Q mismatch. The patient is placed on FiO2 1.0 for 20 minutes. ABG shows PaO2 22 kPa. What does this response to 100% oxygen indicate?