Key result
Fetal atrioventricular valve areas measured by 4D ultrasonography using STIC increased from 0.19 and 0.20 cm2 (tricuspid and mitral) at 18 weeks to 0.93 and 1.06 cm2 at 33 weeks.
Cross-Sectional (n=328)
This study establishes reference curves for fetal atrioventricular valve areas using 3D ultrasound with STIC, demonstrating excellent reproducibility.
Provides normative fetal atrioventricular valve area references by 4D STIC; leaves open prospective validation before clinical adoption.
OBJECTIVE: This study aims to determine reference curves for fetal atrioventricular valve areas by means of three-dimensional ultrasound using the spatiotemporal image correlation (STIC) software. METHODS: This was a cross-sectional prospective study on 328 normal fetuses between the 18th and the 33rd weeks of pregnancy. In order to obtain valve areas, the four heart chambers plane was used with the fetus in a dorsal posterior position. To construct reference ranges, a linear regression model was used, adjusted according to the coefficient of determination (R(2)). To calculate the reproducibility of the tricuspid valve area, the intraclass coefficient correlation (ICC) was used. RESULTS: The mean areas of the tricuspid and mitral valves ranged from 0.19 ± 0.08 and 0.20 ± 0.10 cm(2) in the 18th week to 0.93 ± 0.31 and 1.06 ± 0.39 cm(2) in the 33rd week, respectively. The intra-observer and interobserver reproducibility was excellent with ICC = 0.997 and 0.933, respectively. CONCLUSIONS: Reference curves for fetal atrioventricular valve areas were determined and presented good reproducibility.
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Rôlo et al. (2012) conducted a cross-sectional in normal fetuses (n=328). four-dimensional ultrasonography using spatiotemporal image correlation was evaluated on reference curves for fetal atrioventricular valve areas. Fetal atrioventricular valve areas measured by 4D ultrasonography using STIC increased from 0.19 and 0.20 cm2 (tricuspid and mitral) at 18 weeks to 0.93 and 1.06 cm2 at 33 weeks.
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