Question 17.3 from the first paper of 2010 and the near-identical Question 12 from the second paper of 2007 ask the candidate to interpret a ventilator pressure-time graph, identify that there is auto-PEEP, and calculate static compliance on the basis of the plateau pressure and tidal volume. The college were also interested to see whther the trainees could look back far enough into their primaries to recall the determinants of peak airway pressure. Because this is one of those simple things that most of us have revised and re-forgotten seven times already, this chapter is a necessary aide-memoire.
Determinants of peak airway pressure
Formula for calculation of lung compliance
Other notes of interest for thsi topic include an introduction chapter for ventilator waveform analysis, and the chapter on flow, volume, pressure, resistance and compliance
Other frequently forgotten definitions: