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Closing Capacity & FRC

When closing capacity (CC) exceeds functional residual capacity (FRC), there will be airway closure even during normal breathing. CC exceeds FRC in a person with normal lungs beyond age 45 when supine and beyond age 65 when standing.

CC exceeds FRC at approximate ages

45 when supine

65 when standing

Note : Can someone tell me if CC > FRC below the age of about 5 ? Please contact me by clicking here.

Reference: Steve Yentis et al. Anaesthesia & Intensive Care A - Z, II Edition. Oxford, Butterworth-Heinemann Ltd, 2000, p127.

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