Accurate quantification of mitral regurgitation (MR) severity is critical for appropriate clinical decision making regarding surgical intervention. General imaging three-dimensional quantification (GI3DQ) method allows for direct measurement of mitral regurgitant jet volume (MRJvol) with the help of three-dimensional (3D) color flow Doppler imaging. The aim of this study was to evaluate diagnostic value of MRJvol by GI3DQ for MR grading severity, using the guideline recommended integrated approach as a reference. The study included ninety-seven patients with varying degree of MR, and all MR cases were divided into central MR group (n = 44) and eccentric MR group (n = 53). The MRJvol was measured by GI3DQ. The severity of MR was graded on the basis of recommended integrated approach as mild, moderate, or severe. As assessed by receiver operating characteristic analysis, MRJvol by GI3DQ at a cutoff value of 43.4 ml yielded 76.9% of sensitivity and 86.9% of specificity to differentiate moderate from severe MR in all cases, a cutoff value of 47.5 ml yielded 98.9% of sensitivity and 94.4% of specificity to differentiate moderate from severe MR in central MR, and a cutoff value of 40.7 ml yielded 80.0% of sensitivity and 78.6% of specificity to differentiate moderate from severe MR in eccentric MR. MRJvol measured by GI3DQ could assess MR severity, especially in central MR group, which has higher sensitivity and specificity to differentiate moderate from severe MR.
Keywords: Echocardiography; General imaging three-dimensional quantification; Mitral regurgitant jet volume; Mitral regurgitation.