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2023-09-01

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cc-by-nc-nd (c) Paz y Miño, Fernanda et al., 2023
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/217247

Postnatal genetic and neurodevelopmental assessment in infants born at term with severely low birth weight of non-placental origin

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https://doi.org/10.1002/uog.26188

Abstract

Objective: To determine the frequency of genetic syndromes and childhood neurodevelopmental impairment in non-malformed infants born at term with severely low birth weight and no evidence of placental insufficiency. Methods: This case series was constructed from the data of infants delivered at term between 2013 and 2018 with severely low birth weight, defined as birth weight more than 2.5 SD below the mean, with normal maternal and fetal Doppler (umbilical artery, fetal middle cerebral artery, cerebroplacental ratio and uterine artery) and no maternal hypertensive disorder during pregnancy or fetal structural anomaly on prenatal ultrasound examination. Clinical exome sequencing and copy number variation (CNV) analysis were performed using DNA extracted from the children's saliva. Cognitive and psychomotor development was evaluated using the Bayley Scales of Infant and Toddler Development, 3rd edition or the Wechsler Intelligence Scale for Children, 5th edition tests, according to the child's age at testing. Results: Among the 36 405 infants born within the study period, 274 (0.75%) had a birth weight below -2.5 SD, of whom 98 met the inclusion criteria. Among the 63 families contacted, seven (11%) reported a postnatal diagnosis of a genetic syndrome and a further 18 consented to participate in the study. Median gestational age at delivery was 38.0 (interquartile range (IQR), 37.3-38.5) weeks and median birth weight was 2020 (IQR, 1908-2248) g. All 18 children showed a normal result on clinical exome sequencing and CNV analysis, but six (33%) obtained a low score on neurodevelopmental testing. Conclusion: Non-malformed severely small term infants with no clinical or Doppler signs of placental insufficiency present a high rate of genetic syndromes and neurodevelopmental impairment during childhood. © 2023 The Authors. Ultrasound in Obstetrics & Gynecology published by John Wiley & Sons Ltd on behalf of International Society of Ultrasound in Obstetrics and Gynecology.

Subject

Malalties hereditàries, Diagnòstic prenatal, Infants nadons, Desenvolupament infantil, Neurologia dels nadons

Subject (English)

Genetic diseases, Prenatal diagnosis, Newborn infants, Child development, Neonatal neurology

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Articles publicats en revistes (Cirurgia i Especialitats Medicoquirúrgiques)
Articles publicats en revistes (BCNatal Fetal Medicine Research Center)
Articles publicats en revistes (IDIBAPS: Institut d'investigacions Biomèdiques August Pi i Sunyer)

Citation

PAZ Y MIÑO, Fernanda, et al. Postnatal genetic and neurodevelopmental assessment in infants born at term with severely low birth weight of non-placental origin. Ultrasound in Obstetrics & Gynecology. 2023. Vol. 62, num. 3, pags. 361-368. ISSN 0960-7692. [consulted: 12 of August of 2026]. Available at: https://hdl.handle.net/2445/217247

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