Are intracardiac echogenic foci markers of congenital heart disease in the fetus with chromosomal abnormalities?

Chromosomal microarray analysis for the detection of chromosome abnormalities in fetuses with echogenic intracardiac focus in women without high-risk factors

To investigate the association between pathogenic copy number variants (p-CNVs) and abnormal karyotypes detected by chromosomal microarray analysis (CMA) and echogenic intracardiac focus (EIF).This was a retrospective study of fetuses with EIF with CMA data at the Prenatal Diagnosis Center of the West China Second University Hospital of Sichuan University between September 2014 and May 2017. Fetuses were assigned to the isolated EIF and non-isolated EIF groups according to the presence of other ultrasound abnormalities.Among 244 pregnant women, there were 143 cases of isolated EIF and 101 of non-isolated EIF. CMA revealed chromosome abnormality (n = 9 (3.7%): trisomy 21, n = 4; sexual trisomy, n = 2; and p-CNV, n = 3), variants of unknown significance (VOUS, n = 19), and benign CNV (b-CNV, n = 216). Among the fetuses with isolated EIF, 5 had chromosomal abnormalities (3.5%). Among the fetuses with non-isolated EIF, four had chromosomal abnormalities (4.0%). All fetuses with trisomy 21 were in the non-isolated group. The frequency of labor induction was 66.7% (6/9) among the fetuses with chromosome abnormality and 21.1% (4/19) among those with VOUS. Among those with chromosomal abnormalities, one (11.1%) had congenital heart disease.In pregnant women without high-risk factors for chromosomal abnormalities, ultrasound abnormalities, including EIF, could be an indication for CMA. Ultrasound abnormalities (including EIF) and chromosome abnormality could indicate a high risk of CHD. The presence of EIF and at least another ultrasound abnormality could indicate a high risk of trisomy 21.

Influence of second-trimester ultrasound markers for Down syndrome in pregnant women of advanced maternal age

The objective of the present study was to evaluate the influence of second-trimester ultrasound markers on the incidence of Down syndrome among pregnant women of advanced maternal age. This was a retrospective cohort study on 889 singleton pregnancies between the 14th and 30th weeks, with maternal age ≥ 35 years, which would undergo genetic amniocentesis. The second-trimester ultrasound assessed the following markers: increased nuchal fold thickness, cardiac hyperechogenic focus, mild ventriculomegaly, choroid plexus cysts, uni- or bilateral renal pyelectasis, intestinal hyperechogenicity, single umbilical artery, short femur and humerus length, hand/foot alterations, structural fetal malformation, and congenital heart disease. To investigate differences between the groups with and without markers, nonparametric tests consisting of the chi-square test or Fisher's exact test were used. Moreover, odds ratios with their respective 95% confidence intervals were calculated. Out of the 889 pregnant women, 131 (17.3%) presented markers and 758 (82.7%) did not present markers on the second-trimester ultrasound. Increased nuchal fold (P < 0.001) and structural malformation (P < 0.001) were the markers most associated with Down syndrome. The presence of one marker increased the relative risk 10.5-fold, while the presence of two or more markers increased the risk 13.5-fold. The presence of markers on the second-trimester ultrasound, especially thickened nuchal fold and structural malformation, increased the risk of Down syndrome among pregnant women with advanced maternal age.

Intracardiac echogenic focus and fetal outcome - review of cases from a tertiary care centre in Karachi, Pakistan

OBJECTIVE

To study the outcome in fetuses with intracardiac echogenic focus (ICEF) at the time of second trimester scan.

METHODS

All women with the sonographic findings of ICEF from January 2009 to December 2010 were included in this retrospective study.

RESULTS

ICEF were found in 71 out of 8226 screened (0.86%) women. Mean maternal age in the population was 26.9 ± 3.9 years. Foci were the isolated marker in 69 (97%) cases. In two cases there were additional findings of choroid plexus cysts. A fetal echocardiograph was done only in 13 (18.3%) patients. Majority of these pregnancies (95.7%) had a normal outcome. Postnatal echocardiograph was performed in 11 neonates (15%) out of which one had a small VSD, and in another case Tetralogy of Fallot was found. In addition, Pulmonary artery hypertension was diagnosed in one case. There was one intrauterine fetal demise and two neonatal deaths in this cohort.

CONCLUSIONS

The prevalence of ICEF was 0.86% in our study population. About 95.77% of these cases had an uncomplicated perinatal outcome. It was an isolated finding in almost all cases. These findings will be helpful in counseling parents in our setting.

Isolated fetal intracardiac hyperechogenic focus associated with neonatal outcome and triple test results

OBJECTIVE

To investigate the relationship between isolated intracardiac hyperechogenic focus (IHF) in the mid trimester of pregnancy with neonatal outcomes and triple test results.

MATERIALS AND METHODS

The study included low-risk pregnant women who came for routine follow-up to our antenatal clinic between years 2000 and 2005. A detailed structural survey by ultrasound (USG) of the fetal heart was performed on each fetus in the mid-trimester of pregnancy. All patients had mid-trimester triple tests performed between the 16th and 18th weeks' of pregnancy. We recruited a total of 40 pregnancies that had fetal IHF in the level II USG examination and a control group of 100 healthy pregnant women those which were followed-up during the same period. Twenty-nine fetuses (72.5%) had left, 8 (20%) had right whereas 3 (7.5%) had bilateral ventricular IHF. We compared the perinatal and neonatal outcomes and triple test results of the fetuses that had right and left IHF, and the controls.

RESULTS

Cytogenetic amniocentesis was performed to 6 (15%) women in the study and 5 (5%) in the control group and all were normal. During follow-up IHF spontaneously disappeared in 30 fetuses [right (n: 5), left (n: 23) or bilateral (n: 2)]. We did not observe any cardiac problem in the postnatal period in all newborns. Only one infant (2.5%) in the study group was admitted to neonatal intensive care unit because of prematurity. Median delivery weeks (P = 0.023), head circumference (P = 0.013), 5-min Apgar score (P = 0.021] and apnea (P = 0.042) were significantly higher in fetuses with right IHF. Compared to the controls, median delivery weeks (P = 0.038) was significantly higher in fetuses with right IHF, but head circumference (P = 0.004), 1-min (P = 0.003) and 5-min (P < 0.001) Apgar scores were lower in fetuses with left IHF. However no difference was observed in second-trimester serum human chorionic gonadotropin (HCG), alpha-fetoprotein (AFP) and estriol (E(3)) levels, in the three groups. There was no correlation between serum HCG, AFP and E(3) levels and the presence of IHF.

CONCLUSIONS

Isolated IHF in the fetal heart in the mid-trimester of pregnancy seems not associated with adverse neonatal outcome and does not correlate with triple test results.

Ultrasound and fetal diagnosis

PURPOSE OF REVIEW

The purpose of this review is to highlight publications from the last year that have advanced the use of ultrasound in obstetrics.

RECENT FINDINGS

Anatomic examination of the fetus in the first trimester has been emphasized because it allows for early diagnosis of many conditions. The prevalence of absent nasal bone, a marker for trisomy 21, in euploid fetuses depends on ethnicity. Nasal bone hypoplasia is another marker for Down syndrome. Studies on genetic screening in the first trimester have involved various serum analytes, adjustments in timing and calculations, use in multiple gestations, and the association of extreme measurements with adverse outcomes. A first-trimester integrated screening approach, which incorporates nuchal translucency, nasal bone, crown-rump length, pregnancy-associated plasma protein-A, and free beta-human chorionic gonadotropin, has the potential to maximize detection rates of Down syndrome and trisomy 18 and minimizes the screen-positive rate. The value of combining first and second-trimester results in sequential, contingent, or integrated screening protocols has been assessed. Isolated mild ventriculomegaly (10-12 mm) may prove to be a normal variant, and the role of 'soft' ultrasound markers in genetic counseling continues to be debated. Anomaly or high-risk status detection in the second trimester has been enhanced by the use of Doppler, 3D/4D ultrasound, and magnetic resonance imaging.

SUMMARY

Imaging techniques have been critical in the development of screening methods for Down syndrome or trisomy 18 and for euploid fetuses at high risk for adverse outcomes.