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Published on: September 5, 2011
Prenatal diagnosis in twin gestations
Joy Vink1, Ronald Wapner, Mary E D'Alton
1Division of Maternal Fetal Medicine, Department of OB/GYN, Columbia University Medical Center, New York, NY 10032, USA. joyvink@gmail.com
Seminars in Perinatology
|June 21, 2012
Summary
Twin pregnancies have higher risks for genetic and structural issues. Early detailed ultrasounds and targeted fetal echocardiography are crucial for accurate prenatal diagnosis in twins.
Area of Science:
- Maternal-Fetal Medicine
- Prenatal Diagnosis
- Genetics
Background:
- Twin gestations exhibit elevated risks for structural abnormalities and aneuploidy compared to singleton pregnancies.
- Accurate prenatal diagnosis of fetal genetic disorders and structural anomalies is essential for twin pregnancies.
- Increased congenital anomaly risks necessitate comprehensive fetal anatomical surveys in early second-trimester twin gestations.
Purpose of the Study:
- To highlight the importance of accurate prenatal diagnosis in twin gestations.
- To recommend specific diagnostic approaches based on twin type and conception method.
- To address the challenges and uncertainties in prenatal screening and invasive diagnostic procedures for twins.
Main Methods:
- Review of current recommendations for fetal anatomical surveys in twin gestations.
- Consideration of fetal echocardiography in specific high-risk twin subgroups.
- Discussion of the limitations and accuracy of aneuploidy screening in twin pregnancies.
- Analysis of risks associated with invasive prenatal diagnostic procedures in twin gestations.
Main Results:
- Detailed sonographic surveys are recommended in early second-trimester twin gestations.
- Fetal echocardiography is advised for monochorionic twins and dichorionic twins from assisted reproductive technologies due to congenital heart disease risks.
- Aneuploidy screening in twins is less accurate than in singletons.
- Invasive diagnostic procedures in twins carry a higher risk of pregnancy loss, with precise rates remaining unclear.
Conclusions:
- Early and detailed ultrasound assessment is vital for twin pregnancies.
- Targeted echocardiography and careful consideration of aneuploidy screening are necessary.
- The risks of invasive prenatal diagnosis in twins require further clarification.
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