Measurement values of the diameters of normal fetal cardiac by fetal echocardiogram in mid­second trimester

Abstract

Objective　To measure the normal fetal cardiac reference values about left atrium，right atrium，left ventricle，right ventricle，aorta，pulmonary artery in mid­second trimester and evaluate the dynamic changes.Methods　The diameters of 854 cases of normal fetal cardiac were measured by two­dimensional ultrasound and the parameters were obtained，according to gestational weeks，the cases were divided into five groups：the first group：20­24 weeks；the second group：25­28 weeks；the third group：29­32 weeks；the fourth group：33­36 weeks；the fifth group：37­40 weeks.Calculated the average of the parameters in each groups and then compared the various parameters with each gestational weeks among every groups by regression correlation analysis.Results　The size of the atrium and ventricle，the diameter of the aorta and pulmonary artery were enlarged with increasing gestational weeks，and gestational weeks were significantly positive correlated(P<0.05)，the interior diameters of fetal right atrium and ventricle were greater than the left，the interior diameters of pulmonary artery were greater than aortic，with statistical significance.Conclusions　The diameters of fetal cardiac size are significantly associated with gestational weeks.According to these，we can evaluate the development situations of fetal cardiac. The development of fetal cardiac is dominant in right cardiac.To grasp the normal values diameters of fetal cardiac during this gestational week range is helpful to identify the fetal congenital heart disease.