How does early ultrasound scan estimation of gestational age lead to higher rates of preterm birth?

Yang, Hong; Kramer, Michael S.; Platt, Robert W.; Blondel, Béatrice; Breart, Gérard; Morin, Isabelle; Wilkins, Russell; Usher, Robert H.

doi:10.1067/mob.2002.120487

Cited by 110 publications

(90 citation statements)

References 18 publications

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“…Gestational age determination by ultrasound before 20 weeks, although more accurate than the date of the last menstrual period, leads to an increase in preterm births. 20 In Brazil, where the number of elective cesarean sections is extremely high, there is a cultural bias toward making the cesarean section a woman's choice. Also, the 'convenience' of its performance for the physician leads to the socalled 'iatrogenic' cesarean section.…”

Section: Discussionmentioning

confidence: 99%

Resuscitative procedures at birth in late preterm infants

Almeida

Guinsburg

Costa³

et al. 2007

J Perinatol

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Objective: Evaluate the need for resuscitative procedures at birth, in late prematures.Study Design: This prospective cohort study enrolled all liveborn infants from 1 to 30 September 2003, with 34 to 41 weeks of gestation without congenital anomalies, born in 35 public hospitals of 20 Brazilian state capitals. Logistic regression analyzed variables associated with the need for bag and mask ventilation.Result: Of the 10 774 infants studied, 1054 were late preterms and 485 required resuscitative measures. Of the 1054, 338 (32%) received only free-flow oxygen, 143 (14%) were bag and mask ventilated, 27 (3%) were intubated and 10/27 received chest compressions and/or medications. Bag and mask ventilation in late preterms was associated with twin gestation, maternal hypertension, nonvertex presentation, cesarean delivery and lower gestational age.Conclusion: Improving control of maternal hypertension, prolonging gestation for 1 to 2 weeks and restricting operative deliveries could decrease the need of resuscitation of late preterms at birth.

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Section: Discussionmentioning

confidence: 99%

Resuscitative procedures at birth in late preterm infants

Almeida

Guinsburg

Costa³

et al. 2007

J Perinatol

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“…3,16 Early ultrasound, which is the best method to assess gestational age, was not available as it is routinely performed in developed countries. 20,21 This might have resulted in classification errors in gestational age misclassifying preterm births in term births. We found only 1% of preterm births, whereas this rate is usually higher in sub-Saharan Africa.…”

Section: Discussionmentioning

confidence: 99%

Maternal Anemia in Benin: Prevalence, Risk Factors, and Association with Low Birth Weight

Bodeau-Livinec¹,

Briand²,

Berger³

et al. 2011

The American Journal of Tropical Medicine and Hygiene

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“…17 In particular, early ultrasound corrects last menstrual period-based estimates by a systematic shift to the left (ie, toward lower gestational ages) across the entire gestational age distribution, primarily because of the effect of delayed ovulation. 31 Our method, however, corrects only gross errors by excluding preterm (and some postterm) infants whose birth weights are more compatible with 40-week births. We have also experimented with more complex statistical corrections (eg, Ϯ1, 2, 4, and 8 weeks), but the more complex algorithms are far more computer-intensive, result in many more exclusions, and do not substantially alter the slopes or SGA or LGA cutoffs of the reference curves.…”

Section: Discussionmentioning

confidence: 99%

A New and Improved Population-Based Canadian Reference for Birth Weight for Gestational Age

et al. 2001

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ABSTRACT. Background. Existing fetal growth references all suffer from 1 or more major methodologic problems, including errors in reported gestational age, biologically implausible birth weight for gestational age, insufficient sample sizes at low gestational age, singlehospital or other non-population-based samples, and inadequate statistical modeling techniques.Methods. We used the newly developed Canadian national linked file of singleton births and infant deaths for births between 1994 and 1996, for which gestational age is largely based on early ultrasound estimates. Assuming a normal distribution for birth weight at each gestational age, we used the expectation-maximization algorithm to exclude infants with gestational ages that were more consistent with 40-week births than with the observed gestational age. Distributions of birth weight at the corrected gestational ages were then statistically smoothed.Results. The resulting male and female curves provide smooth and biologically plausible means, standard deviations, and percentile cutoffs for defining small-and large-for-gestational-age births. Large-for-gestational age cutoffs (90th percentile) at low gestational ages are considerably lower than those of existing references, whereas small-for-gestational-age cutoffs (10th percentile) postterm are higher.

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How does early ultrasound scan estimation of gestational age lead to higher rates of preterm birth?

Cited by 110 publications

References 18 publications

Resuscitative procedures at birth in late preterm infants

Resuscitative procedures at birth in late preterm infants

Maternal Anemia in Benin: Prevalence, Risk Factors, and Association with Low Birth Weight

A New and Improved Population-Based Canadian Reference for Birth Weight for Gestational Age

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