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Closing Capacity Age 44 Supine — FRCA Primary MCQ

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HardPhysiology - RespiratoryClosing Capacity Age 44 SupineFRCA Primary

Closing capacity exceeds FRC in the supine position from approximately what age?

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Correct answer: E — 44 years

Closing capacity increases with age. Supine: CC exceeds FRC at approximately age 44. Upright: CC exceeds FRC at approximately age 66. When CC > FRC airway closure occurs during normal tidal breathing causing V/Q mismatch and impaired oxygenation.

Reference: Power Kam 2018 Principles of Physiology for the Anaesthetist