Prenatal detection of heart defects at the routine fetal examination at 18 weeks in a non-selected population

Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology
E TegnanderD T Linker

Abstract

Few studies have addressed the prenatal detection rate of congenital heart defects in a non-selected population at 18 weeks of gestation. Our objective was to assess the change in the prenatal detection rate of congenital heart defects in such a population that resulted from incorporating the four-chamber view at the second-trimester routine ultrasound examination. The prenatal detection rate of heart defects was prospectively compared between 4435 fetuses in Phase I who were scanned without special attention to the heart, and 7459 fetuses in Phase II who were scanned incorporating the four-chamber view. Of the 49 heart defects in Phase 1, 17 (35%) were critical and three (18%) of these were detected prenatally. Of the 90 heart defects in Phase II, 23 (26%) were critical, six (26%) of these were detected prenatally at the 18 weeks' routine scan, and three were detected in the third trimester, providing a total prenatal detection rate of 39%. A defect was classified as critical when a surgical repair was likely to be required because of gross structural complexity having a functional significance, e.g. transposition of the great arteries, hypoplastic left heart syndrome, atrioventricular septal defect, coarctation of the aorta, ...Continue Reading

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