Advanced
Technical
IVT
ejection fraction reserve
The increase in ejection fraction from rest to peak stress, indicating contractile reserve of the left ventricle.
Full Definition
Ejection fraction reserve represents the heart's ability to increase its pumping efficiency under stress conditions, typically measured as the difference between peak stress and resting ejection fraction values. This parameter is crucial in stress echocardiography and cardiac MRI for assessing myocardial viability and predicting outcomes in patients with heart failure. A normal response shows an increase of at least 5-10% in ejection fraction during stress testing.
Usage
Usage note: Distinguish from baseline ejection fraction measurements; always specify the stress protocol used.
In Context
- "The patient demonstrated preserved ejection fraction reserve with an increase from 45% to 58% during dobutamine infusion." — Stress echocardiography report
- "Absence of ejection fraction reserve suggests non-viable myocardium in the anterior wall." — Viability study interpretation
Also known as
contractile reserve
EF reserve
Contrasted with
contractile dysfunction
Don't confuse with
ejection fraction
fractional shortening