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Updated: Jun 11, 2026

Modeling Posthemorrhagic Hydrocephalus of Prematurity in Rats
Published on: March 28, 2025
Transport of premature infants is associated with increased risk for intraventricular haemorrhage
1Newborn Services Department, The George Washington University Medical Center, Washington, DC 20037, USA. mmohamed@mfa.gwu.edu
Insights
Inter-hospital transport of very low birth weight (VLBW) infants is linked to a higher incidence and severity of intraventricular haemorrhages (IVH). This association remained consistent over the study period, highlighting transport risks for vulnerable newborns.
Area of Science:
- Neonatalogy
- Perinatal Medicine
- Clinical Epidemiology
Background:
- Intraventricular haemorrhages (IVH) significantly impact outcomes for very low birth weight (VLBW) infants.
- Understanding risk factors for IVH is crucial for improving neonatal care.
Purpose of the Study:
- To examine the correlation between inter-hospital transport and the incidence and severity of IVH in VLBW infants.
- To analyze trends in IVH and neonatal transport over time.
Main Methods:
- Analysis of the US National Inpatient Sample Database (NIS) from 1997-2004.
- Inclusion of VLBW infants (<1500 g), categorized into transport and inborn groups.
- Logistic regression models used to calculate adjusted odds ratios (OR) for IVH, controlling for confounders.
Main Results:
- A total of 67,596 VLBW infants were studied.
- The transport group showed a higher incidence of IVH (27.4% vs 13.42%) and severe IVH (44.1% vs 32.9%) compared to the inborn group.
- Adjusted ORs indicated a significant correlation between transport and increased risk of IVH (OR 1.75) and severe IVH (OR 1.44).
Conclusions:
- Inter-hospital transport of VLBW infants is associated with increased incidence and severity of IVH.
- This correlation has remained constant over recent years.
- Neonatal transport and IVH incidence have both shown increasing trends over time.
Background:
Intraventricular haemorrhages (IVH) greatly impact the outcome of very low birth weight (VLBW) infants. This study examines the correlation between inter-hospital transport and the incidence and severity of IVH in VLBW infants in a large cohort of data.
Methods:
The US National Inpatient Sample Database (NIS) and its KID subportion were analysed for the years 1997-2004. Infants <1500 g were included in the study and were classified into transport and inborn groups. Groups were further classified according to birth weight into <1000 g and 1000-1499 g. IVH and severe IVH (grades 3-4) were compared between groups and subgroups. Adjusted OR for IVH or severe IVH in correlation with inter-hospital transport were calculated using logistic regression models while controlling for clinical and demographic confounders. We examined changing trends of the incidence of IVH, incidence of neonatal transport and OR for IVH in correlation with neonatal transport in VLBW infants over the years.
Results:
A total of 67 596 VLBW infants were included in the study. Overall incidence of IVH in the sample was 14.7%; the transport group had more IVH compared to inborn group (27.4% vs 13.42%): adjusted OR 1.75 (95% CI 1.64 to 1.86; p<0.001). Severe IVH was higher in the transport group compared to the inborn group (44.1% vs 32.9%); adjusted OR 1.44 (95% CI 1.22 to 1.70, p=0.001). Similar results were demonstrated in weight-based subgroups. There was increasing trends for neonatal transport and for IVH over the years (p<0.001 for both) with no significant change in the OR for IVH in transported infants.
Conclusion:
Inter-hospital transport of VLBW Infants is correlated with increased incidence and severity of IVH. This correlation has remained constant over the recent years.
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