Related Experiment Videos
Case-control study of antenatal and intrapartum risk factors for cerebral palsy in very preterm singleton babies
D J Murphy1, S Sellers, I Z MacKenzie
1National Perinatal Epidemiology Unit, Radcliffe Infirmary, Oxford UK.
Insights
Certain antenatal factors like chorioamnionitis and prolonged membrane rupture increase cerebral palsy risk in very preterm infants. However, pre-eclampsia and delivery without labor appear protective.
Area of Science:
- Neonatal neurology
- Perinatal medicine
- Developmental pediatrics
Background:
- The 1980s saw increased survival for very preterm infants, but also a rise in cerebral palsy rates within this population.
- The specific antenatal and intrapartum factors contributing to cerebral palsy in very preterm neonates remain incompletely understood.
Purpose of the Study:
- To identify adverse and protective antenatal and intrapartum factors associated with cerebral palsy in very preterm infants.
- To provide data that can inform strategies for preventing cerebral palsy in this vulnerable group.
Main Methods:
- A case-control study was conducted using a population-based register.
- Cases comprised 59 very preterm infants with cerebral palsy; controls included 234 randomly selected infants.
- Statistical analysis adjusted for gestational age to determine odds ratios for various risk and protective factors.
Main Results:
- Cerebral palsy risk decreased with increasing gestational age and birthweight.
- Identified risk factors included chorioamnionitis (OR 4.2), prolonged rupture of membranes (OR 2.3), and maternal infection (OR 2.3).
- Protective factors included pre-eclampsia (OR 0.4) and delivery without labor (OR 0.3); intrauterine growth retardation showed no increased risk (OR 1.0).
Conclusions:
- Antenatal factors significantly influence the risk of cerebral palsy in very preterm infants.
- Targeting modifiable antenatal risk factors like infections and prolonged membrane rupture may reduce cerebral palsy incidence.
- Randomized controlled trials are needed to evaluate the impact of managing adverse antenatal factors on cerebral palsy rates.
Abstract:
The increase in survival of very preterm babies during the 1980s was accompanied by a sharp increase in the rate of cerebral palsy in this group. The relation between antenatal and intrapartum factors and cerebral palsy in such babies has not been well defined. To identify adverse and protective antenatal and intrapartum factors we undertook a case-control study of 59 very preterm babies who developed cerebral palsy, identified from a population-based register, and 234 randomly selected controls. The frequency of cerebral palsy decreased with increasing gestational age and birthweight. Antenatal complications occurred in 215 (73%) of the women with preterm deliveries. Factors associated with an increased risk of cerebral palsy after adjustment for gestational age were chorioamnionitis (odds ratio 4.2 [95% CI 1.4-12.0]) prolonged rupture of membranes (2.3 [1.2-4.2]), and maternal infection (2.3 [1.2-4..5]). Pre-eclampsia was associated with a reduced risk of cerebral palsy (0.4 [0.2-0.9]), as was delivery without labour (0.3 [0.2-0.7]). There was no increased risk of cerebral palsy with intrauterine growth retardation (1.0 [0.9-1.1]). The effect of rigorous management of adverse antenatal factors on the frequency of cerebral palsy in very preterm babies should be tested in randomised controlled trials.