[I-OR01-06] The novel approach by Vector Flow Mapping for the assessment of intraventricular pressure gradients in congenital heart disease
Keywords:echocardiography, IVPG, LV suction
【Background】Intraventricular pressure gradient reflects early diastolic sucking produced by elastic recoil, which is well known calculated from color M mode Doppler echocardiography. It is one of the important echocardiographic diastolic parameters. But, calculation for C-IVPG is complicated, then it is not easy to use in daily practice. Recently, novel IVPG measurement used by Vector Flow Mapping (V-IVPG) was developed, which enable for us to apply the assessments of diastolic active sucking practically.【Aim】The aim of this study is to investigate the feasibility and efficacy of V-IVPG for assessments of early diastolic function in congenital heart disease. 【Subjects and Methods】27 patients (age: median 9 years ranged from 3 to 20 yrs; 14 male) were enrolled. Color M mode and 2D color mapping images in left ventricular 4 chamber or 3 chamber view were acquired. C-IVPGs were calculated from velocity information of ventricular inflow in color M mode Doppler using Euler's equation, while V-IVPGs were measured from intraventricular relative pressure distribution using Navier-Stokes equation.【Results】V-IVPGs are well correlated with C-IVPGs significantly (V-IVPG=0.58xC-IVPG+0.03, r=0.77, p＜0.0001). The bias between Corrected V-IVPG (0.58xV-IVPG) and C-IVPG was -0.05, and Limits of agreement was ranged from -1.1 to 1.0. 【Conclusion】V-IVPG could be feasible and useful echocardiographic parameter for assessment of active sucking in congenital heart disease.