Mechanical Vent Test 4 Practice

Which statement correctly describes static and dynamic compliance definitions?

Static compliance uses Pplat minus PEEP. Dynamic compliance uses Pplat minus PEEP. Static compliance uses PIP minus PEEP. Dynamic compliance uses PIP minus PEEP.

Correct Answer:

Dynamic compliance uses PIP minus PEEP.

Explanation:

The main concept is how static and dynamic compliance are defined using different pressure measurements during ventilation. Static compliance reflects the elastic properties of the lungs when flow is zero, so it’s calculated from tidal volume divided by the difference between plateau pressure and PEEP (Vt / (Pplat − PEEP)). Dynamic compliance reflects the combination of elastic and airway resistance during ongoing flow, so it uses peak inspiratory pressure instead: tidal volume divided by the difference between peak inspiratory pressure and PEEP (Vt / (PIP − PEEP)). Since PIP includes the resistive pressure drop in the airways, while Pplat does not, the statement that dynamic compliance uses PIP minus PEEP is the correct one.

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