pressure-volume loop
A graphical representation plotting airway pressure against lung volume during a respiratory cycle. Used to assess lung mechanics and optimize ventilator settings.
Full Definition
A pressure-volume loop is a real-time graphical display that plots airway pressure on the x-axis against delivered tidal volume on the y-axis throughout a complete respiratory cycle. This tool allows respiratory therapists to visualize lung compliance, identify overdistension, detect air trapping, and optimize PEEP settings. The shape and characteristics of the loop provide valuable information about respiratory system mechanics, helping clinicians adjust ventilator parameters to minimize ventilator-induced lung injury while ensuring adequate ventilation.
Usage
Usage note: Hyphenate when used as a compound modifier; use as separate words when functioning as a noun phrase.
In Context
- "The pressure-volume loop revealed a characteristic beaking pattern, indicating overdistension and prompting a PEEP reduction." — Ventilator assessment report
- "Analysis of the pressure-volume loop showed improved compliance following the recruitment maneuver." — Clinical documentation