Doppler ultrasound in aortic stenosis: In vitro studies of pressure gradient determination

摘要: Torricelli's equation expresses a simple relationship between fluid velocity and pressure gradient in orifice flow is currently used conjunction with noninvasive Doppler ultrasound to determine gradients mitral stenosis, aortic as well other cardiovascular orifices. In theory, however, the Torricelli overestimates stenosis Borda should be more applicable. A brief tutorial derivation of equations presented. The applicability was studied experimentally rigid wall, pulsatile analogue. manometric data were collected simultaneously. Percent peak rate viscosity varied. results demonstrated that consistently overestimated gradient. At 61% area overestimation exceeded 100%. vivo studies are required relevance observations clinical situations.