Outcomes of pregnancies with varying levels of nuchal translucency measurements: A population‐based retrospective study in Ontario, Canada
Introduction Nuchal translucency prenatal ultrasound is widely used to screen for chromosomal abnormalities. An elevated nuchal translucency has been associated with adverse outcomes such as pregnancy loss; however, extant studies investigating these associations have had important limitations, incl...
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          | Published in | Acta obstetricia et gynecologica Scandinavica Vol. 103; no. 12; pp. 2499 - 2510 | 
|---|---|
| Main Authors | , , , , , , , , , | 
| Format | Journal Article | 
| Language | English | 
| Published | 
        United States
          John Wiley & Sons, Inc
    
        01.12.2024
     John Wiley and Sons Inc Wiley  | 
| Subjects | |
| Online Access | Get full text | 
| ISSN | 0001-6349 1600-0412 1600-0412  | 
| DOI | 10.1111/aogs.14965 | 
Cover
| Abstract | Introduction
Nuchal translucency prenatal ultrasound is widely used to screen for chromosomal abnormalities. An elevated nuchal translucency has been associated with adverse outcomes such as pregnancy loss; however, extant studies investigating these associations have had important limitations, including selection bias. This study aimed to investigate the association between nuchal translucency measurements and pregnancy outcome, specifically, a composite of pregnancy loss, termination, stillbirth, or neonatal death.
Material and Methods
This was a population‐based retrospective cohort study conducted with data from the prescribed perinatal registry in Ontario, Canada, Better Outcomes Registry & Network. All singleton pregnancies with an estimated date of delivery from September 1, 2016, to March 31, 2021, and multiple marker screening including a nuchal translucency were included. Pregnancies with measurements 2.0‐ < 2.5 mm, 2.5‐ < 3.0 mm, 3.0‐ < 3.5 mm, 3.5‐ < 5.0 mm, 5.0‐ < 6.5 mm, and ≥6.5 mm were compared to a reference group with measurements <2.0 mm. We used multivariable modified Poisson regression models with robust variance estimation to estimate associations between nuchal translucency measurement and pregnancy outcome, with adjustment for age at estimated date of delivery and gestational age at screening.
Results
There were 414 268 singleton pregnancies included in the study. The risk of pregnancy loss, termination, stillbirth, or neonatal death increased with increasing levels of nuchal translucency measurements, with an adjusted risk ratio (aRR) of 11.9 (95% confidence interval (CI) 9.9, 14.3) in the group with measurements 3.5‐ < 5.0 mm. When pregnancies with diagnosed chromosomal abnormalities were excluded, this association remained strong, with an aRR of 6.4 (95% CI 4.8, 8.5). Among pregnancies with a live birth, those with a higher nuchal translucency measurement (>5.0 mm vs. <2.0 mm) were also at increased risk of adverse perinatal outcomes such as admission to the neonatal intensive care unit and APGAR score <7.
Conclusions
In this population‐based study using robust methods to reduce the risk of selection bias, we found that pregnancies with increased nuchal translucency measurements are less likely to result in a live birth, even with the exclusion of chromosomal abnormalities. Pregnancies with increased nuchal translucency measurements that resulted in a live birth may also be at increased risk of adverse perinatal outcomes.
Studies investigating the association between nuchal translucency measurements and pregnancy outcomes have been subject to selection bias. This study provides robust evidence of the increased risk of pregnancy loss, termination, stillbirth, or neonatal death with increasing nuchal translucency measurements. | 
    
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| AbstractList | Studies investigating the association between nuchal translucency measurements and pregnancy outcomes have been subject to selection bias. This study provides robust evidence of the increased risk of pregnancy loss, termination, stillbirth, or neonatal death with increasing nuchal translucency measurements. Abstract Introduction Nuchal translucency prenatal ultrasound is widely used to screen for chromosomal abnormalities. An elevated nuchal translucency has been associated with adverse outcomes such as pregnancy loss; however, extant studies investigating these associations have had important limitations, including selection bias. This study aimed to investigate the association between nuchal translucency measurements and pregnancy outcome, specifically, a composite of pregnancy loss, termination, stillbirth, or neonatal death. Material and Methods This was a population‐based retrospective cohort study conducted with data from the prescribed perinatal registry in Ontario, Canada, Better Outcomes Registry & Network. All singleton pregnancies with an estimated date of delivery from September 1, 2016, to March 31, 2021, and multiple marker screening including a nuchal translucency were included. Pregnancies with measurements 2.0‐ < 2.5 mm, 2.5‐ < 3.0 mm, 3.0‐ < 3.5 mm, 3.5‐ < 5.0 mm, 5.0‐ < 6.5 mm, and ≥6.5 mm were compared to a reference group with measurements <2.0 mm. We used multivariable modified Poisson regression models with robust variance estimation to estimate associations between nuchal translucency measurement and pregnancy outcome, with adjustment for age at estimated date of delivery and gestational age at screening. Results There were 414 268 singleton pregnancies included in the study. The risk of pregnancy loss, termination, stillbirth, or neonatal death increased with increasing levels of nuchal translucency measurements, with an adjusted risk ratio (aRR) of 11.9 (95% confidence interval (CI) 9.9, 14.3) in the group with measurements 3.5‐ < 5.0 mm. When pregnancies with diagnosed chromosomal abnormalities were excluded, this association remained strong, with an aRR of 6.4 (95% CI 4.8, 8.5). Among pregnancies with a live birth, those with a higher nuchal translucency measurement (>5.0 mm vs. <2.0 mm) were also at increased risk of adverse perinatal outcomes such as admission to the neonatal intensive care unit and APGAR score <7. Conclusions In this population‐based study using robust methods to reduce the risk of selection bias, we found that pregnancies with increased nuchal translucency measurements are less likely to result in a live birth, even with the exclusion of chromosomal abnormalities. Pregnancies with increased nuchal translucency measurements that resulted in a live birth may also be at increased risk of adverse perinatal outcomes. Introduction Nuchal translucency prenatal ultrasound is widely used to screen for chromosomal abnormalities. An elevated nuchal translucency has been associated with adverse outcomes such as pregnancy loss; however, extant studies investigating these associations have had important limitations, including selection bias. This study aimed to investigate the association between nuchal translucency measurements and pregnancy outcome, specifically, a composite of pregnancy loss, termination, stillbirth, or neonatal death. Material and Methods This was a population‐based retrospective cohort study conducted with data from the prescribed perinatal registry in Ontario, Canada, Better Outcomes Registry & Network. All singleton pregnancies with an estimated date of delivery from September 1, 2016, to March 31, 2021, and multiple marker screening including a nuchal translucency were included. Pregnancies with measurements 2.0‐ < 2.5 mm, 2.5‐ < 3.0 mm, 3.0‐ < 3.5 mm, 3.5‐ < 5.0 mm, 5.0‐ < 6.5 mm, and ≥6.5 mm were compared to a reference group with measurements <2.0 mm. We used multivariable modified Poisson regression models with robust variance estimation to estimate associations between nuchal translucency measurement and pregnancy outcome, with adjustment for age at estimated date of delivery and gestational age at screening. Results There were 414 268 singleton pregnancies included in the study. The risk of pregnancy loss, termination, stillbirth, or neonatal death increased with increasing levels of nuchal translucency measurements, with an adjusted risk ratio (aRR) of 11.9 (95% confidence interval (CI) 9.9, 14.3) in the group with measurements 3.5‐ < 5.0 mm. When pregnancies with diagnosed chromosomal abnormalities were excluded, this association remained strong, with an aRR of 6.4 (95% CI 4.8, 8.5). Among pregnancies with a live birth, those with a higher nuchal translucency measurement (>5.0 mm vs. <2.0 mm) were also at increased risk of adverse perinatal outcomes such as admission to the neonatal intensive care unit and APGAR score <7. Conclusions In this population‐based study using robust methods to reduce the risk of selection bias, we found that pregnancies with increased nuchal translucency measurements are less likely to result in a live birth, even with the exclusion of chromosomal abnormalities. Pregnancies with increased nuchal translucency measurements that resulted in a live birth may also be at increased risk of adverse perinatal outcomes. Studies investigating the association between nuchal translucency measurements and pregnancy outcomes have been subject to selection bias. This study provides robust evidence of the increased risk of pregnancy loss, termination, stillbirth, or neonatal death with increasing nuchal translucency measurements. Nuchal translucency prenatal ultrasound is widely used to screen for chromosomal abnormalities. An elevated nuchal translucency has been associated with adverse outcomes such as pregnancy loss; however, extant studies investigating these associations have had important limitations, including selection bias. This study aimed to investigate the association between nuchal translucency measurements and pregnancy outcome, specifically, a composite of pregnancy loss, termination, stillbirth, or neonatal death.INTRODUCTIONNuchal translucency prenatal ultrasound is widely used to screen for chromosomal abnormalities. An elevated nuchal translucency has been associated with adverse outcomes such as pregnancy loss; however, extant studies investigating these associations have had important limitations, including selection bias. This study aimed to investigate the association between nuchal translucency measurements and pregnancy outcome, specifically, a composite of pregnancy loss, termination, stillbirth, or neonatal death.This was a population-based retrospective cohort study conducted with data from the prescribed perinatal registry in Ontario, Canada, Better Outcomes Registry & Network. All singleton pregnancies with an estimated date of delivery from September 1, 2016, to March 31, 2021, and multiple marker screening including a nuchal translucency were included. Pregnancies with measurements 2.0- < 2.5 mm, 2.5- < 3.0 mm, 3.0- < 3.5 mm, 3.5- < 5.0 mm, 5.0- < 6.5 mm, and ≥6.5 mm were compared to a reference group with measurements <2.0 mm. We used multivariable modified Poisson regression models with robust variance estimation to estimate associations between nuchal translucency measurement and pregnancy outcome, with adjustment for age at estimated date of delivery and gestational age at screening.MATERIAL AND METHODSThis was a population-based retrospective cohort study conducted with data from the prescribed perinatal registry in Ontario, Canada, Better Outcomes Registry & Network. All singleton pregnancies with an estimated date of delivery from September 1, 2016, to March 31, 2021, and multiple marker screening including a nuchal translucency were included. Pregnancies with measurements 2.0- < 2.5 mm, 2.5- < 3.0 mm, 3.0- < 3.5 mm, 3.5- < 5.0 mm, 5.0- < 6.5 mm, and ≥6.5 mm were compared to a reference group with measurements <2.0 mm. We used multivariable modified Poisson regression models with robust variance estimation to estimate associations between nuchal translucency measurement and pregnancy outcome, with adjustment for age at estimated date of delivery and gestational age at screening.There were 414 268 singleton pregnancies included in the study. The risk of pregnancy loss, termination, stillbirth, or neonatal death increased with increasing levels of nuchal translucency measurements, with an adjusted risk ratio (aRR) of 11.9 (95% confidence interval (CI) 9.9, 14.3) in the group with measurements 3.5- < 5.0 mm. When pregnancies with diagnosed chromosomal abnormalities were excluded, this association remained strong, with an aRR of 6.4 (95% CI 4.8, 8.5). Among pregnancies with a live birth, those with a higher nuchal translucency measurement (>5.0 mm vs. <2.0 mm) were also at increased risk of adverse perinatal outcomes such as admission to the neonatal intensive care unit and APGAR score <7.RESULTSThere were 414 268 singleton pregnancies included in the study. The risk of pregnancy loss, termination, stillbirth, or neonatal death increased with increasing levels of nuchal translucency measurements, with an adjusted risk ratio (aRR) of 11.9 (95% confidence interval (CI) 9.9, 14.3) in the group with measurements 3.5- < 5.0 mm. When pregnancies with diagnosed chromosomal abnormalities were excluded, this association remained strong, with an aRR of 6.4 (95% CI 4.8, 8.5). Among pregnancies with a live birth, those with a higher nuchal translucency measurement (>5.0 mm vs. <2.0 mm) were also at increased risk of adverse perinatal outcomes such as admission to the neonatal intensive care unit and APGAR score <7.In this population-based study using robust methods to reduce the risk of selection bias, we found that pregnancies with increased nuchal translucency measurements are less likely to result in a live birth, even with the exclusion of chromosomal abnormalities. Pregnancies with increased nuchal translucency measurements that resulted in a live birth may also be at increased risk of adverse perinatal outcomes.CONCLUSIONSIn this population-based study using robust methods to reduce the risk of selection bias, we found that pregnancies with increased nuchal translucency measurements are less likely to result in a live birth, even with the exclusion of chromosomal abnormalities. Pregnancies with increased nuchal translucency measurements that resulted in a live birth may also be at increased risk of adverse perinatal outcomes. IntroductionNuchal translucency prenatal ultrasound is widely used to screen for chromosomal abnormalities. An elevated nuchal translucency has been associated with adverse outcomes such as pregnancy loss; however, extant studies investigating these associations have had important limitations, including selection bias. This study aimed to investigate the association between nuchal translucency measurements and pregnancy outcome, specifically, a composite of pregnancy loss, termination, stillbirth, or neonatal death.Material and MethodsThis was a population‐based retrospective cohort study conducted with data from the prescribed perinatal registry in Ontario, Canada, Better Outcomes Registry & Network. All singleton pregnancies with an estimated date of delivery from September 1, 2016, to March 31, 2021, and multiple marker screening including a nuchal translucency were included. Pregnancies with measurements 2.0‐ < 2.5 mm, 2.5‐ < 3.0 mm, 3.0‐ < 3.5 mm, 3.5‐ < 5.0 mm, 5.0‐ < 6.5 mm, and ≥6.5 mm were compared to a reference group with measurements <2.0 mm. We used multivariable modified Poisson regression models with robust variance estimation to estimate associations between nuchal translucency measurement and pregnancy outcome, with adjustment for age at estimated date of delivery and gestational age at screening.ResultsThere were 414 268 singleton pregnancies included in the study. The risk of pregnancy loss, termination, stillbirth, or neonatal death increased with increasing levels of nuchal translucency measurements, with an adjusted risk ratio (aRR) of 11.9 (95% confidence interval (CI) 9.9, 14.3) in the group with measurements 3.5‐ < 5.0 mm. When pregnancies with diagnosed chromosomal abnormalities were excluded, this association remained strong, with an aRR of 6.4 (95% CI 4.8, 8.5). Among pregnancies with a live birth, those with a higher nuchal translucency measurement (>5.0 mm vs. <2.0 mm) were also at increased risk of adverse perinatal outcomes such as admission to the neonatal intensive care unit and APGAR score <7.ConclusionsIn this population‐based study using robust methods to reduce the risk of selection bias, we found that pregnancies with increased nuchal translucency measurements are less likely to result in a live birth, even with the exclusion of chromosomal abnormalities. Pregnancies with increased nuchal translucency measurements that resulted in a live birth may also be at increased risk of adverse perinatal outcomes. Nuchal translucency prenatal ultrasound is widely used to screen for chromosomal abnormalities. An elevated nuchal translucency has been associated with adverse outcomes such as pregnancy loss; however, extant studies investigating these associations have had important limitations, including selection bias. This study aimed to investigate the association between nuchal translucency measurements and pregnancy outcome, specifically, a composite of pregnancy loss, termination, stillbirth, or neonatal death. This was a population-based retrospective cohort study conducted with data from the prescribed perinatal registry in Ontario, Canada, Better Outcomes Registry & Network. All singleton pregnancies with an estimated date of delivery from September 1, 2016, to March 31, 2021, and multiple marker screening including a nuchal translucency were included. Pregnancies with measurements 2.0- < 2.5 mm, 2.5- < 3.0 mm, 3.0- < 3.5 mm, 3.5- < 5.0 mm, 5.0- < 6.5 mm, and ≥6.5 mm were compared to a reference group with measurements <2.0 mm. We used multivariable modified Poisson regression models with robust variance estimation to estimate associations between nuchal translucency measurement and pregnancy outcome, with adjustment for age at estimated date of delivery and gestational age at screening. There were 414 268 singleton pregnancies included in the study. The risk of pregnancy loss, termination, stillbirth, or neonatal death increased with increasing levels of nuchal translucency measurements, with an adjusted risk ratio (aRR) of 11.9 (95% confidence interval (CI) 9.9, 14.3) in the group with measurements 3.5- < 5.0 mm. When pregnancies with diagnosed chromosomal abnormalities were excluded, this association remained strong, with an aRR of 6.4 (95% CI 4.8, 8.5). Among pregnancies with a live birth, those with a higher nuchal translucency measurement (>5.0 mm vs. <2.0 mm) were also at increased risk of adverse perinatal outcomes such as admission to the neonatal intensive care unit and APGAR score <7. In this population-based study using robust methods to reduce the risk of selection bias, we found that pregnancies with increased nuchal translucency measurements are less likely to result in a live birth, even with the exclusion of chromosomal abnormalities. Pregnancies with increased nuchal translucency measurements that resulted in a live birth may also be at increased risk of adverse perinatal outcomes.  | 
    
| Author | Dougan, Shelley D. Walker, Mark Meng, Lynn Potter, Beth K. Okun, Nan Armour, Christine M. Bellai‐Dussault, Kara Little, Julian Lavin Venegas, Carolina Fell, Deshayne B.  | 
    
| AuthorAffiliation | 5 Ottawa Hospital Research Institute Ottawa Ontario Canada 4 DAN Women & Babies Program, Sunnybrook Health Sciences Centre Toronto Ontario Canada 3 Children's Hospital of Eastern Ontario Research Institute Ottawa Ontario Canada 2 Prenatal Screening Ontario, Better Outcomes Registry & Network (BORN) Ontario Ottawa Ontario Canada 1 University of Ottawa, School of Epidemiology and Public Health Ottawa Ontario Canada  | 
    
| AuthorAffiliation_xml | – name: 4 DAN Women & Babies Program, Sunnybrook Health Sciences Centre Toronto Ontario Canada – name: 2 Prenatal Screening Ontario, Better Outcomes Registry & Network (BORN) Ontario Ottawa Ontario Canada – name: 3 Children's Hospital of Eastern Ontario Research Institute Ottawa Ontario Canada – name: 1 University of Ottawa, School of Epidemiology and Public Health Ottawa Ontario Canada – name: 5 Ottawa Hospital Research Institute Ottawa Ontario Canada  | 
    
| Author_xml | – sequence: 1 givenname: Kara orcidid: 0000-0003-0225-1906 surname: Bellai‐Dussault fullname: Bellai‐Dussault, Kara email: kbell024@uottawa.ca organization: Children's Hospital of Eastern Ontario Research Institute – sequence: 2 givenname: Shelley D. surname: Dougan fullname: Dougan, Shelley D. organization: Children's Hospital of Eastern Ontario Research Institute – sequence: 3 givenname: Deshayne B. surname: Fell fullname: Fell, Deshayne B. organization: Children's Hospital of Eastern Ontario Research Institute – sequence: 4 givenname: Carolina surname: Lavin Venegas fullname: Lavin Venegas, Carolina organization: Children's Hospital of Eastern Ontario Research Institute – sequence: 5 givenname: Julian surname: Little fullname: Little, Julian organization: University of Ottawa, School of Epidemiology and Public Health – sequence: 6 givenname: Lynn surname: Meng fullname: Meng, Lynn organization: Prenatal Screening Ontario, Better Outcomes Registry & Network (BORN) Ontario – sequence: 7 givenname: Nan surname: Okun fullname: Okun, Nan organization: DAN Women & Babies Program, Sunnybrook Health Sciences Centre – sequence: 8 givenname: Mark surname: Walker fullname: Walker, Mark organization: Ottawa Hospital Research Institute – sequence: 9 givenname: Christine M. surname: Armour fullname: Armour, Christine M. organization: Children's Hospital of Eastern Ontario Research Institute – sequence: 10 givenname: Beth K. surname: Potter fullname: Potter, Beth K. organization: University of Ottawa, School of Epidemiology and Public Health  | 
    
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/39342615$$D View this record in MEDLINE/PubMed | 
    
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| Keywords | pregnancy outcome chromosomal abnormalities perinatal outcomes nuchal translucency prenatal screening  | 
    
| Language | English | 
    
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| Snippet | Introduction
Nuchal translucency prenatal ultrasound is widely used to screen for chromosomal abnormalities. An elevated nuchal translucency has been... Nuchal translucency prenatal ultrasound is widely used to screen for chromosomal abnormalities. An elevated nuchal translucency has been associated with... IntroductionNuchal translucency prenatal ultrasound is widely used to screen for chromosomal abnormalities. An elevated nuchal translucency has been associated... Studies investigating the association between nuchal translucency measurements and pregnancy outcomes have been subject to selection bias. This study provides... Abstract Introduction Nuchal translucency prenatal ultrasound is widely used to screen for chromosomal abnormalities. An elevated nuchal translucency has been...  | 
    
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| SubjectTerms | Abortion, Spontaneous - epidemiology Adult chromosomal abnormalities Female Humans Infant, Newborn nuchal translucency Nuchal Translucency Measurement Ontario - epidemiology Original Research perinatal outcomes Pregnancy Pregnancy Outcome prenatal screening Registries Retrospective Studies Stillbirth Stillbirth - epidemiology  | 
    
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| Title | Outcomes of pregnancies with varying levels of nuchal translucency measurements: A population‐based retrospective study in Ontario, Canada | 
    
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