Predictors of respiratory depression at birth in the term infant

Authors

  • TF Baskett,

    Corresponding author
    1. a Department of Obstetrics and Gynaecology, b Perinatal Epidemiology Research Unit and c Department of Pediatrics, Dalhousie University, Halifax, Nova Scotia, Canada
      Dr TF Baskett, Department of Obstetrics and Gynaecology, Dalhousie University, 5980 University Avenue, Halifax, Nova Scotia, Canada B3K 6R8. Email tbaskett@ns.sympatico.ca
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  • a VM Allen,

    1. a Department of Obstetrics and Gynaecology, b Perinatal Epidemiology Research Unit and c Department of Pediatrics, Dalhousie University, Halifax, Nova Scotia, Canada
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  • a CM O‘Connell,

    1. a Department of Obstetrics and Gynaecology, b Perinatal Epidemiology Research Unit and c Department of Pediatrics, Dalhousie University, Halifax, Nova Scotia, Canada
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  • and b AC Allen c

    1. a Department of Obstetrics and Gynaecology, b Perinatal Epidemiology Research Unit and c Department of Pediatrics, Dalhousie University, Halifax, Nova Scotia, Canada
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Dr TF Baskett, Department of Obstetrics and Gynaecology, Dalhousie University, 5980 University Avenue, Halifax, Nova Scotia, Canada B3K 6R8. Email tbaskett@ns.sympatico.ca

Abstract

Objective  To evaluate predictive factors for respiratory depression at birth in infants ≥37 weeks.

Design  A population-based cohort study of respiratory depression at birth at term and post-term.

Setting  Nova Scotia, Canada.

Population  All 126 604 nonanomalous, singleton deliveries ≥37 weeks in cephalic presentation from 1988–2002.

Methods  An analysis of maternal, antenatal, intrapartum, and neonatal factors associated with respiratory depression at birth ≥37 weeks.

Main outcome measures  A composite outcome of delay in initiating and maintaining respiration after birth, 5-minute Apgar score ≤ 3, or neonatal seizures due to hypoxic–ischaemic encephalopathy.

Results  The rate of respiratory depression at birth with delay in respiration was 5.2/1000, with Apgar ≤ 3 1.0/1000 live births, and with neonatal seizures 0.7/1000. A composite of any of the three respiratory depressions at birth criteria showed comparable low rates with spontaneous delivery (4.4/1000) and elective caesarean (4.8/1000). Compared with elective caesarean delivery, vacuum (13.2/1000, relative risk [RR] 3.97, P < 0.001), forceps (8.8/1000, RR 1.84, P= 0.003), failed vacuum (13.3/1000, RR 2.76, P= 0.005), failed forceps (33.3/1000, RR 6.93, P < 0.001), and caesarean in labour (17.0/1000, RR 3.54, P < 0.001) had significantly higher rates of the composite outcome.

Conclusion  Overall, the rate of respiratory depression at birth in the term infant was low and the serious manifestation of seizures was less than 1 in 1000. There was a significant relationship between operative delivery in labour and respiratory depression at birth.

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