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The effect of polyhydramnios degree on chromosomal microarray results: a retrospective cohort analysis of 742 singleton pregnancies

  • Maternal-Fetal Medicine
  • Published:
Archives of Gynecology and Obstetrics Aims and scope Submit manuscript

Abstract

Purpose

To analyze the risk for clinically significant microarray aberrations in pregnancies with polyhydramnios.

Methods

Data from all chromosomal microarray analyses (CMA) performed due to polyhydramnios between January 2013 and December 2019 were retrospectively obtained from the Ministry of Health Database. The rate of clinically significant (pathogenic and likely pathogenic) CMA findings in isolated and non-isolated polyhydramnios cohorts was compared to a local control group of 5541 fetuses with normal ultrasound, in which 78 (1.4%) abnormal results were demonstrated. Subgroup analyses were performed by the degree of polyhydramnios, week of diagnosis, maternal age, and the presence of additional sonographic anomalies.

Results

In the isolated polyhydramnios cohort, 19/623 (3.1%) clinically significant CMA aberrations were noted, a significantly higher rate compared to the control population. However, the risk for abnormal CMA results in the 158 cases with mild polyhydramnios (AFI 25–29.9, or maximal vertical pocket 8–11.9 cm) did not significantly differ from pregnancies with normal ultrasound. Of 119 cases of non-isolated polyhydramnios (most frequently associated with cardiovascular (26.1%) and brain (15.1%) anomalies), 8 (6.7%) abnormal CMA findings were noted, mainly karyotype-detectable.

Conclusion

Mild polyhydramnios was not associated with an increased rate of clinically significant microarray results, compared to pregnancies with normal ultrasound. An extensive anatomical sonographic survey should be performed in pregnancies with polyhydramnios, with consideration of fetal echocardiography.

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Abbreviations

AFI:

Amniotic fluid index

CMA:

Chromosomal microarray analysis

CI:

Confidence interval

CNVs:

Copy number variants

MVP:

Maximal vertical pocket

NOS:

Non-otherwise specified

SD:

Standard deviation

RR:

Relative risk

VOUS:

Variants of unknown significance

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Acknowledgements

We are grateful to all Israeli genetic counselors and laboratory workers engaged in prenatal evaluation of fetal malformations, who made this study possible.

Funding

No financial support of funding was received for this work.

Author information

Authors and Affiliations

  1. Genetics Institute, Carmel Medical Center, Affiliated to the Ruth and Bruce Rappaport Faculty of Medicine, Technion—Israel Institute of Technology, Haifa, Israel

    Lena Sagi-Dain & Amir Peleg

  2. Community Genetics, Public Health Services, Ministry of Health, Jerusalem, Israel

    Amihood Singer

  3. Institute of Human Genetics, Galilee Medical Center, Nahariya, Israel

    Tzipora Falik-Zaccai

  4. The Azrieli Faculty of Medicine, Bar-Ilan, Safed, Israel

    Tzipora Falik-Zaccai

  5. The Genetic Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel

    Anat Bar-Shira & Shay Ben Shachar

  6. Genetics Institute, Assaf Harofeh Medical Center, Zerifin, Israel

    Michal Feingold-Zadok

  7. Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel

    Shay Ben Shachar & Idit Maya

  8. Recanati Genetics Institute, Beilinson Hospital, Rabin Medical Center, Petah Tikva, Israel

    Idit Maya

Authors
  1. Lena Sagi-Dain
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  2. Amihood Singer
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  4. Amir Peleg
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  6. Michal Feingold-Zadok
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  8. Idit Maya
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Corresponding author

Correspondence to Lena Sagi-Dain.

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All authors declare that they have no conflicts of interests.

Ethical standards

The study was approved by the Institutional Review Board Committee (Helsinki Committee) for Human Subjects (date of issue—September 6, 2016, registration number—MOH2016). No informed consent was required due to the retrospective nature of data acquisition.

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Sagi-Dain, L., Singer, A., Falik-Zaccai, T. et al. The effect of polyhydramnios degree on chromosomal microarray results: a retrospective cohort analysis of 742 singleton pregnancies. Arch Gynecol Obstet 304, 649–656 (2021). https://doi.org/10.1007/s00404-021-05995-y

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  • DOI: https://doi.org/10.1007/s00404-021-05995-y

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