Understanding continuous-wave Doppler signal intensity as a measure of regurgitant severity

Bolger, 1988, Quantifying valvular regurgitation: the limitations and inherent assumptions of Doppler techniques, Circulation, 87, 1316, 10.1161/01.CIR.78.5.1316 Krayenbuehl, 1987, The use of invasive techniques, angiography and indicator dilution for quantification of valvular regurgitations, Eur Heart J, 8, 1, 10.1093/eurheartj/8.suppl_C.1 Miyatake, 1986, Semiquantitative grading of severity of mitral regurgitation by real-time two-dimensional Doppler flow imaging technique, J Am Coll Cardiol, 7, 82, 10.1016/S0735-1097(86)80263-7 Klein, 1991, Transesophageal Doppler echocardiography of pulmonary venous flow: a new marker of mitral regurgitation severity, J Am Coll Cardiol, 18, 518, 10.1016/0735-1097(91)90609-D Teien, 1995, Doppler evaluation of severity of mitral regurgitation: relation to pulmonary venous blood flow patterns in an animal study, J Am Coll Cardiol, 25, 264, 10.1016/0735-1097(94)00338-Q Abbasi, 1980, Detection and estimation of the degree of mitral regurgitation by range-gated pulsed Doppler echocardiography, Circulation, 61, 143, 10.1161/01.CIR.61.1.143 Vandervoort, 1993, Application of color Doppler flow mapping to calculate effective regurgitant orifice area. An in vitro study and initial clinical observations, Circulation, 88, 1150, 10.1161/01.CIR.88.3.1150 Thomas, 1990, Quantification of the jet flow by momentum analysis: an in vitro color Doppler flow study, Circulation, 81, 247, 10.1161/01.CIR.81.1.247 Cape, 1989, A new method for noninvasive quantification of valvular regurgitation based on conservation of momentum. In vitro validation, Circulation, 79, 1343, 10.1161/01.CIR.79.6.1343 Barclay, 1993, The shape of the proximal isovelocity surface area varies with regurgitant orifice size and distance from orifice-computer simulation and model experiments using color M-mode technique, J Am Soc Echocardiogr, 6, 433, 10.1016/S0894-7317(14)80242-3 Bolger, 1988, Computer analysis of color Doppler images for quantitative assessment of in vitro fluid jets, J Am Coll Cardiol, 12, 450, 10.1016/0735-1097(88)90418-4 Jenni, 1989, Quantification of mitral regurgitation with amplitude-weighted mean velocity from continuous wave Doppler spectra, Circulation, 79, 1294, 10.1161/01.CIR.79.6.1294 Veyrat, 1984, Pulsed Doppler echocardiographic indices for assessing mitral regurgitation, Br Heart J, 51, 130, 10.1136/hrt.51.2.130 Utsunomiya, 1992, Can signal intensity of the continuous wave Doppler regurgitant jet estimate severity of mitral regurgitation?, Am Heart J, 123, 166, 10.1016/0002-8703(92)90761-J Hatle, 1985, Doppler Ultrasound in cardiology: physical principles and clinical applications, 34 Bolger, 1992, The multiple determinants of continuous wave signal intensity, Circulation, 86, I316 Pinto, 1991, Signal intensity in grading mitral regurgitation: reliability and pitfalls, J Am Coll Cardiol, 17, 148A, 10.1016/0735-1097(91)91558-V Wranne, 1987, Problems related to the assessment of fluid velocity and volume flow in valve regurgitation using ultrasound Doppler technique, Eur Heart J, 8, 29, 10.1093/eurheartj/8.suppl_C.29