Certified Transport Registered Nurse Certification Practice Exam

What does plateau pressure refer to in ventilatory settings?

1. Pressure during exhalation

2. Airway pressure during an end-inspiratory pause

3. Peak inspiratory pressure

4. Average airway pressure

The correct answer is: Airway pressure during an end-inspiratory pause

Plateau pressure refers specifically to the airway pressure during an end-inspiratory pause, which occurs when airflow has ceased at the end of inspiration. This measurement reflects the pressure in the alveoli at the end of inspiration, providing an indication of lung compliance and helping to assess the mechanical properties of the lung without the influence of resistance from the airflow. Understanding plateau pressure is crucial because it informs clinicians about the state of the lung and can guide appropriate ventilatory strategies. If the plateau pressure is elevated, it may suggest decreased lung compliance, as seen in conditions such as acute respiratory distress syndrome (ARDS) or pneumonia. By measuring plateau pressure, healthcare providers can ensure that the ventilatory settings are optimized to avoid barotrauma and volutrauma while facilitating adequate gas exchange.