Valvular regurgitation, M-mode color flow echocardiography, Pulsed Doppler echocardiography, Two-dimensional Doppler color flow mapping
To assess the value of M-mode color flow echocardiography in detecting valvular regurgitation, fourty-three patients(pts) with regurgitant signals of short duration during systole or diastole by pulsed Doppler echocardiography (PDE) were studied using M-mode color flow echocardiography (MCF) and PDE combined with two-dimensional Doppler color flow mapping (2DD). Of these pts, mitral regurgitation (MR) was suspected in 15, tricuspid regurgitation (TR) in 13, aortic regurgitation (AR) in 7 and pulmonary regurgitation (PR) in 8? Using MCF, regurgitant signals in entire systole and isovolumic relaxation period could be demonstrated in all but four pts with suspected MR or TR by PDE. Even in the 4 pts, longer duration of regurgitant signals were recorded by MCF. In all pts with short signals suggesting AR or PR by PDE, regurgitant signals in entire diastole could be detected when using MCF. By 2DD, a trivial or extremely eccentric regurgitant jet was recorded in all these pts. With PDE combined with 2DD, the sampling volume could not match a regurgitant jet partly during systole or diastole. With MCF combined with 2DD, a regurgitant jet could be on the beam during entire systole or diastole in most of the pts. In conclusion, pulsed Doppler echocardiography has some limitations and M-mode color flow echocardiography is more useful in the detection of valvular regurgitation.