A 55-year-old man is ventilated for ARDS. He is on PCV with Pinsp 18 cmH2O above PEEP, PEEP 12 cmH2O, FiO2 0.6, RR 24/min. The delivered tidal volume ...

Question

A 55-year-old man is ventilated for ARDS. He is on PCV with Pinsp 18 cmH2O above PEEP, PEEP 12 cmH2O, FiO2 0.6, RR 24/min. The delivered tidal volume varies between 320 and 480 mL over the past hour. What is the most likely explanation for the tidal volume variability in pressure-controlled ventilation?

Accepted Answer

Changes in lung compliance and/or airway resistance affecting the volume delivered at a fixed pressure

Answer

Ventilator malfunction

Answer

Oxygen sensor drift

Answer

Variations in atmospheric pressure

Answer

Fluctuations in PEEP delivery

uk-fficm MCQ (SBA): Mechanical Ventilation