Abstract
Objectives: The aims of this study were to investigate the role of TUI-STIC in the sequential segmental analysis of conotruncal defects. Methods: Four-dimensional volumes from 120 cases of confirmed fetal congenital heart disease diagnosed and managed at our hospital were evaluated using TUI-STIC. To select the best interslice distance for adequate display of the cardiovascular connections, each volume was opened and the TUI mode activated, having as a reference the ventricular outlet. The number of slices was set at nine. The volume was then scrolled until the most significant echocardiographic views were displayed on the screen windows. Results: Among the 120 CHD fetuses, 25 fetuse were diagnosed as conotruncal defects by TUI-STIC, including 5 transposition of the great vessels, 9 tetralogy of Fallot, 3 truncus arteriosus and 5 double outlet respectively, 3 pulmonary stenosis. Postnatal eehocardiography or autopsy confirmed. The sensitivity, specificity,positive predictive valve of these features to indicate conotruncal defects were 97.6%, 99.5% respectively. Conclusions: Abnormal in arrangement, size, origin or nondisplaying of pulmonary artery and aorta in TUI-STIC has a high specificity and sensitivity in predicating conotruncal defects. TUI-STIC allows a complete sequential analysis of conotruncal defects in the fetus and could improve the prenatal diagnosis rate.
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