aortic regurgitation fraction
The percentage of stroke volume that regurgitates back through an incompetent aortic valve during diastole.
Full Definition
Aortic regurgitation fraction quantifies the severity of aortic insufficiency by calculating the ratio of regurgitant volume to forward stroke volume, expressed as a percentage. Values less than 30% indicate mild regurgitation, 30-49% moderate, and 50% or greater severe regurgitation. This measurement is crucial during cardiac anesthesia as acute aortic regurgitation can develop from surgical manipulation, inadequate valve repair, or hemodynamic changes. The regurgitation fraction directly impacts ventricular loading conditions and influences anesthetic management strategies.
Usage
Usage note: Express as percentage; distinguish from absolute regurgitant volume measurements.
In Context
- "Post-repair TEE revealed an aortic regurgitation fraction of 15%, indicating successful valve reconstruction." — Operative report
- "The aortic regurgitation fraction increased to 45% following cardiopulmonary bypass separation." — Echocardiography report