The figure below illustrates an airway pressure waveform of a single breath during volume controlled ventilation, incorporating an end inspiratory pause and an auto- PEEP manoeuvre.
X Axis – Time in seconds
Y axis – Airway pressure in cm water
(a) What are the factors which determine variable B?
(b) If the delivered tidal volume was 500 ml, what is the calculated compliance?
(c) List the change(s) you would make to the ventilator settings to treat an increase in the value of variable D.