Define lung compliance (30% marks). Describe how is it measured (70% marks).
This is a core area of physiology that relates to everyday Intensive Care practice, thus it was
expected that more than the observed number of candidates would have scored well. Candidates
performed poorly purely from a lack of sufficient knowledge. Easy marks were to be gained
purely by mentioning that compliance is defined by ∆V/∆P, the ∆P being the gradient from
alveolar – intrapleural, normal values, static and dynamic compliance. Good answers would then
include a mention of how static and dynamic compliance is measured (specifically how volume
and pressures are measured.