What is the primary clinical implication of a low static respiratory compliance in ventilated patients?

• A. Easier lung inflation
• B. Lower risk of barotrauma
• C. Stiffer lungs requiring higher pressures to achieve the same tidal volume
• D. Increased airway resistance

Answer: (C)

Static (no-flow) compliance measures how easily the lung and chest wall expand for a given change in pressure. It is the change in volume divided by the change in pressure (ΔV/ΔP), with pressure changes tied to plateau pressure minus PEEP. When static compliance is low, the lungs are stiff and resist expansion. To deliver the same tidal volume, you must apply higher pressures to overcome that stiffness. So the primary clinical implication is that stiffer lungs require higher pressures to achieve the same tidal volume, and those higher pressures increase the risk of barotrauma. This assessment focuses on the distensibility of the lung rather than airway resistance, which is why increased resistance isn’t the expected implication.