regurgitant fraction

re·gur·gi·tant frac·tion

the amount of blood regurgitated into a cardiac chamber divided by the stroke output; normally, no blood regurgitates; in patients with severe valvular lesions such as mitral or aortic insufficiency, regurgitant fraction can approach 80%; this fraction affords a quantitative measure of the severity of the valvular lesion.
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Patients with moderate (mitral regurgitant fraction 30-49%) and severe MR (mitral regurgitant fraction [greater than or equal to] 50%), consistent with the recommendations of American Society of Echocardiography, were included in the study (23).
Measurement of Regurgitant Volumeby Phase Contrast MRIMay Be Useful in Evaluation of Aortic Insufficiency Phase contrast magnetic resonance imaging (PC-MRI) has proven very reliable in quantification of aortic insufficiency in patients with various forms of aortic valve disease, but anecdotal data suggest that the regurgitant fraction (RF) may occasionally be significantlyunderestimated.
The ability of semi-quantitative estimation of PR determined by cardiac catheterization to distinguish between mild, moderate and severe pulmonary regurgitation was shown to have significant correlation with pulmonary regurgitant fraction obtained by CMR.
There are several studies comparing Doppler echocardiography and radionuclide assays with cardiac magnetic resonance imaging in the assessment of regurgitant fraction (9); however, there is no study that compares cardiac angiography and cardiac magnetic resonance imaging (CMR) in determining the amount of pulmonary regurgitation.
The mean pulmonary regurgitant fraction was31 [+ or -] 21% (range 0-70; median 30%).
There was significant correlation between pulmonary regurgitant fraction (PRF) obtained by CMR and pulmonary insufficiency measured by angiocardiogram (r=0.
Experimentally, close correlations were found between EBCT and EFP measurements of regurgitant volumes and regurgitant fractions (63).
MR assessment of chamber size, flow volumes, regurgitant fractions and flow velocities through valvular orifices would be determined ideally with the patient in a vertical position, when the heart must pump against its greatest load, e.