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Work of Breathing — FRCA Primary MCQ

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ModeratePhysiology - RespiratoryWork of BreathingFRCA Primary

The work of breathing is increased by all of the following EXCEPT:

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Correct answer: A — Increased lung compliance

Increased lung compliance (more distensible lungs) reduces the elastic work of breathing. All other options increase work of breathing: decreased compliance increases elastic work / increased resistance and bronchospasm increase resistive work / increased respiratory rate increases both components. Emphysema increases compliance but increases work due to air trapping.

Reference: Power Kam 2018 Principles of Physiology for the Anaesthetist