Research Information System
Cardiovascular Imaging, vol.10, no.3, pp.121-125, 1998 (Scopus)
We investigated the relationship between tricuspid planimetered regurgitant jet area obtained by transthoracic color flow mapping and the parameters derived using proximal isovelocity surface area (PISA) method (tricuspid regurgitant orifice area-RA, maximal tricuspid regurgitant flow rate-Q) in patients with mitral stenosis. Forty-five patients with tricuspid regurgitation secondary to mitral stenosis were included in the study. In these patients RA and Q were calculated with and without α angle correction; α was the actual sector angle subtended by the valve leaflets. For calculation with α angle correction Q1 was described as Q1 = 2πV(r) r2 α/180°, and for calculation without angle correction Q2 was described as Q2 = 2πV(r) r2 where Vr was the first aliasing velocity at distance r from the tricuspid valve orifice. RA was calculated as RA = Q/V(t), where V(t) was the orifice velocity obtained by continuous wave Doppler. Transthoracic color flow mapping analysis was performed by color Doppler echocardiography in each patient. The correlation between the parameters derived using PISA method without angle correction and planimetered was better (r = 0.85 for RA, r = 0.73 for Q1) than the correlation between planimetered regurgitant jet area and the parameters derived using PISA method with angle correction (r = 0.76 for RA, r = 0.66 for Q2). In conclusion, two color Doppler echocardiographic techniques, PISA method and transthoracic color flow mapping, were well correlated in assessing tricuspid regurgitation, and correlation was better without angle correction.