pressure-volume loop
Graphical representation of left ventricular pressure-volume relationships throughout the cardiac cycle, used to assess cardiac function.
Full Definition
A pressure-volume (PV) loop is a graphical plot that displays the relationship between left ventricular pressure and volume throughout a complete cardiac cycle, providing comprehensive assessment of cardiac performance. The loop's shape and position reveal information about preload, afterload, contractility, and ventricular compliance. Key parameters derived from PV loops include stroke work (loop area), end-systolic pressure-volume relationship (contractility index), and end-diastolic pressure-volume relationship (compliance). In cardiothoracic anesthesia, PV loop analysis helps optimize hemodynamic management, assess the effects of interventions, and guide decision-making regarding mechanical support devices.
Usage
Usage note: Hyphenate pressure-volume when used as compound modifier; abbreviate as PV loop.
In Context
- "The pressure-volume loop analysis revealed decreased contractility with a rightward shift of the end-systolic pressure-volume relationship." — Cardiac catheterization report
- "Real-time pressure-volume loops guided optimization of preload and afterload during weaning from cardiopulmonary bypass." — Research protocol