The pressure half-time index is the time it takes for the initial ... aortic regurgitation can be detected by injecting contrast into the aortic root and visualizing the appearance of contrast ...
Mild poststenotic dilatation and increased left atrium/aortic root transverse ratio is noted ... with a dimensionless index of: V1/V2 ≠ 0.80/4.57 0.18 indicative of severe aortic stenosis.Pk ...