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Published on: November 22, 2013
Embryonic heart rate as a prognostic factor for chromosomal abnormalities
Deniz Oztekin1, Ozgur Oztekin, Fatma I Aydal
1Department of Obstetrics and Gynecology, Aegean Obstetrics and Gynecology Training and Research Hospital, Izmir, Turkey. dcoztekin@gmail.com
Insights
A slow embryonic heart rate before 7 weeks of gestation may indicate a higher risk of chromosomal abnormalities. This finding suggests embryonic heart rate can be an early screening marker for genetic conditions.
Area of Science:
- Prenatal diagnostics
- Embryology
- Genetics
Background:
- Early pregnancy monitoring is crucial for identifying potential developmental issues.
- Chromosomal abnormalities can significantly impact pregnancy outcomes.
Purpose of the Study:
- To assess the predictive value of a slow embryonic heart rate for chromosomal abnormalities.
- To determine if embryonic heart rate serves as an early screening marker.
Main Methods:
- Compared heart rates of 57 embryos with slow rates to 1156 with normal rates before 7 weeks' gestation.
- Utilized screening blood tests and invasive karyotype analysis for risk assessment.
Main Results:
- Pregnancies with slow embryonic heart rates had a 15.8% first-trimester death rate versus 2.5% in the normal group.
- A higher percentage of trisomy 21 was observed in the slow heart rate group compared to the normal heart rate group (P < .05).
Conclusions:
- A slow embryonic heart rate before 7 weeks' gestation is associated with an increased likelihood of chromosomal abnormalities.
- Embryonic heart rate may serve as a valuable early screening tool for genetic conditions.
Objective:
The purpose of this study was to evaluate the role of a slow embryonic heart rate in embryos before 7 weeks' gestation as a marker in screening for chromosomal abnormalities.
Methods:
Fifty-seven embryos before 7 weeks' gestation with slow heart rates were compared with 1156 embryos of the same gestational period with normal heart rates. Embryos that showed an increased risk of chromosomal abnormalities in the screening blood tests underwent invasive analysis for abnormal karyotype detection.
Results:
The rates of first-trimester death were 15.8% for pregnancies with slow embryonic heart rates (9 of 57) and 2.5% for those with normal heart rates (29 of 1156). Because of the increased risk of chromosomal abnormalities, amniocentesis was performed on 6 with slow embryonic heart rates and 61 with normal embryonic heart rates. After karyotype analysis, there were 2 fetuses with trisomy 21 in each group, which represented significantly higher percentage of embryos with trisomy 21 in the slow-heart rate group compared with the normal-heart rate group (P < .05).
Conclusions:
When a slow embryonic heart rate is detected before 7 weeks' gestation, there is a higher likelihood of chromosomal abnormalities.
