[A New Quantitative Method for Quantifying Left Heart Jets by Doppler Color Imaging]

Quantification of valvular lesions by Color Doppler is based on jet measurements. The aim of this new method is to reduce some of the errors in these measurements: uncertainty in delimiting the colored areas of the jets; spontaneous beat-to-beat variations of the jets entailing interpretative difficulties. The first step was to determine the correlations between the colored areas and previously established single-gated Doppler criteria, retaining spectral criteria to define the borders of the jets, so overcoming some of the limitations of color Doppler. The association of these methods resulted in better discrimination between grades and a better correlation in 45 angiographically controlled mitral and aortic regurgitations than with color Doppler alone. In stenotic lesions, spectral criteria from single-gated associated exploration enabled localisation of the level for planimetry of the section of the jet at its origin visualised by color Doppler. Satisfactory correlations were obtained with the Gorlin surface area in a group of 43 patients with mitral and aortic stenosis. A coefficient of variation of 13 to 14 per cent was found with planimetry of the regurgitant jet in the upstream cardiac chamber. Uni-dimensional measurement decreased this variation to 6 to 11 per cent in the same patients. The largest decrease in variability (6 to 8 per cent) was observed in stenotic and regurgitant lesions with planimetry of the section of jet at its origin performed in held mid-expiration and so this would appear to be the best method. The guide lines and technological improvement associated with the physiopathological information provided by color Doppler should refine the quantification of valvular heart lesions.