Quantitative Doppler assessment of valvular regurgitation.

Quantitative Doppler assessment of valvular regurgitation.

BACKGROUND Quantitation of valvular regurgitation remains a challenge. The accuracy of quantitative Doppler is controversial, and its ability to measure regurgitant volume is unknown; therefore, it is not widely used. METHODS AND RESULTS In 120 patients (20 without regurgitation, 19 with aortic regurgitation, and 81 with mitral regurgitation), the stroke volume through the mitral annulus and ...

DOPPLER ECHOCARDIOGRAPHY IN SUBCLINICAL RHEUMATIC VALVULAR REGURGITATION: ALONGTERM STUDY

Doppler echocardiography (DE) is known to be a valuable tool for detecting subclinical forms of valvular regurgitation (VRJ in theacutephase of rheumatic fever (RF). Previous studies have mostly dealt with the acute phase problem with only short-term follow-up. In this study, 24 children between 4-15 years of age (mean age II.X±2.7 years) with RF without clinically diagnosed carditis (most ...

Valvular Heart Disease Pathophysiology of Tricuspid Regurgitation Quantitative Doppler Echocardiographic Assessment of Respiratory Dependence

Background—Respiratory dependence of tricuspid regurgitation (TR), a long-held concept suggested by murmur variation, remains unproven and of unclear mechanisms. Methods and Results—In 41 patients with mild or greater TR (median age, 67 years), we performed triple Doppler echocardiographic quantification (TR severity, right ventricular, and right atrial quantification) with simultaneous respiro...

Implications for Doppler Quantification of Valvular Regurgitation

Analysis of velocity acceleration proximal to a regurgitant valve has been proposed as a method to quantify the regurgitant flow rate (Q.). Previous work has assumed inviscid flow through an infinitesimal orifice, predicting hemispheric isovelocity shells, with calculated flow rate given by QC=2rrN2vN, where VN is user-selected velocity of interest and rN is the distance from that velocity to t...

Valvular regurgitation by color Doppler echocardiography.