What is the primary mechanism by which PEEP improves oxygenation in mechanically ventilated patients?

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Multiple Choice

What is the primary mechanism by which PEEP improves oxygenation in mechanically ventilated patients?

PEEP improves oxygenation primarily by reopening collapsed alveoli and keeping them open at end expiration, which increases functional residual capacity. By recruiting and maintaining more alveoli in an open, ventilated state, gas-exchange surfaces are preserved, reducing shunt and increasing the surface area for oxygen transfer into the blood. It’s not about increasing FiO2 or reducing the respiratory rate, and it actually helps improve, not widen, the alveolar-arterial gradient. In short, keeping alveoli open with PEEP maximizes area for gas exchange and raises oxygenation.

PEEP improves oxygenation primarily by reopening collapsed alveoli and keeping them open at end expiration, which increases functional residual capacity. By recruiting and maintaining more alveoli in an open, ventilated state, gas-exchange surfaces are preserved, reducing shunt and increasing the surface area for oxygen transfer into the blood. It’s not about increasing FiO2 or reducing the respiratory rate, and it actually helps improve, not widen, the alveolar-arterial gradient. In short, keeping alveoli open with PEEP maximizes area for gas exchange and raises oxygenation.

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