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    The natural history of pregnancies with a diagnosis of Trisomy 18 or Trisomy 13; a retrospective case series

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    Authors
    Houlihan, Orla A
    O’Donoghue, Keelin
    Issue Date
    2013-11-18
    Keywords
    INFANT
    Local subject classification
    TRISOMY
    
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    Citation
    BMC Pregnancy and Childbirth. 2013 Nov 18;13(1):209
    URI
    http://dx.doi.org/10.1186/1471-2393-13-209
    http://hdl.handle.net/10147/305952
    Abstract
    Abstract Background Trisomy 18 (T18) and trisomy 13 (T13) are the second and third commonest autosomal aneuploidy syndromes respectively. While specific aspects of affected pregnancies have been documented in the literature, few studies document the overall natural history of the trisomies. This study aimed to examine the natural history (including diagnosis, pregnancy outcome, complications and survival) of T18 and T13 pregnancies in a setting where termination of pregnancy for fetal abnormality is not available. Methods Cases were identified using birth registers, labour ward records, annual reports, medical records, ultrasound reports and reports from prenatal genetic testing. All identified T18 and T13 pregnancies in the study region from 2001 to 2012 were included. Individual chart reviews were performed for each case. Data were analysed using SPSS Version 20. Results Forty-six T18 and twenty-four T13 pregnancies were identified. Most T18 cases (65%) were diagnosed prenatally, while only one third (33%) of T13 cases were prenatally diagnosed. Only three T18 pregnancies and one T13 pregnancy were electively terminated. A proportion of undiagnosed infants were delivered by emergency caesarean section. 48% (T18) and 46% (T13) infants survived following birth, for a median of 1.5 days (T18) and 7 days (T13). One T13 infant is currently alive over one year of age. Conclusions This large series provides information for professionals and women regarding the natural histories of trisomies 18 and 13. These pregnancies can go undiagnosed antenatally without routine anomaly scanning. While many fetuses die in-utero, postnatal survival is possible.
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    en
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    Cork University Maternity Hospital

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