By P. Peronneau, B. Diebold, J. P. Guglielmi, O. Lanusel, R. Bele, J. Souquet (auth.), J. Roelandt MD (eds.)
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Additional resources for Color Doppler Flow Imaging: and other advances in Doppler echocardiography
In the region distal to the nozzle or prosthetic valve the pressure gradually increases. In case of the model of aortic stenosis the pressure recovery extended to 9 cm downstream of the nozzle. 5 cm downstream of the valve. On the basis of the experimental measurements an expression for the total pressure recovery was derived . The equation is related to the velocity at the site of the obstruction: (5) Thus it appears that the pressure recovery is determined by the velocity at the site of the obstruction and by the ratio between the cross-sectional flow area at the obstruction and that of the flow channel distal to the obstruction.
Several nozzle designs were used to represent different degrees in severity of the stenosis. When energy losses at the inlet were considered the following relationship could be derived when the fluid passes from tap I to tap II in Fig. 2. (4) The velocity proximal to the obstruction is assumed to be low as compared to the velocity at the site of the stenosis. The energy losses at the inlet region are represented by the nozzle coefficient Cd' The value of the nozzle coefficient varies from 1 to 0 with increasing energy losses.
62 ::19 79 664 15 163 02 6. 6 6J. '0. 8J. Figure 4. Mean diastolic pressure difference (MDG) is defined as the mean of pressure drops calculated for digitized points during diastole. End diastolic pressure difference (EDV) is defined as the maximal instantaneous velocity at the onset (0) of the ORS complex. This point in the cardiac cycle is entered as a reference point by the user . End diastolic pressure difference (EDG) is defined as the pressure drop calculated from the end diastolic velocity (EDV) using the simplified Bernoulli equation.