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Intraventricular hemorrhage and high-frequency ventilation: a meta-analysis of prospective clinical trials
R H Clark1, F D Dykes, T E Bachman
1Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia 30322, USA.
Insights
High-frequency ventilation (HFV) may increase the risk of periventricular leukomalacia (PVL) in premature neonates, but not intraventricular hemorrhage (IVH). Recent studies suggest HFV is not linked to increased IVH or PVL, challenging earlier findings.
Area of Science:
- Neonatal Medicine
- Pediatric Neurology
- Respiratory Care
Background:
- The association between high-frequency ventilation (HFV) and adverse neurologic outcomes like intraventricular hemorrhage (IVH) and periventricular leukomalacia (PVL) in preterm neonates remains debated.
- Understanding this relationship is crucial for optimizing respiratory support in premature infants.
Purpose of the Study:
- To conduct a meta-analysis of prospective randomized control trials comparing HFV with conventional ventilation.
- To determine if HFV increases the risk of IVH and/or PVL in premature neonates with respiratory distress syndrome.
Main Methods:
- A meta-analysis of nine studies comparing HFV and conventional ventilation in preterm neonates.
- Calculation of the absolute risk difference for IVH and PVL between HFV and conventional ventilation groups.
- Evaluation of data with and without the HIFI trial due to its large size.
Main Results:
- HFV was associated with an increased risk of PVL (OR=1.7; 95% CI: 1.06-2.74), but not IVH or severe IVH.
- Excluding the HIFI trial data showed no significant differences in IVH or PVL rates between HFV and conventional ventilation.
- Observed variations in IVH and PVL rates (14-47% and 5-16%) may be due to differing patient populations.
Conclusions:
- The initial association between HFV and adverse neurologic outcomes was heavily influenced by the HIFI trial.
- Meta-analysis of more recent studies suggests HFV is not associated with an increased occurrence of IVH or PVL.
- Current evidence indicates HFV may not pose a higher risk for IVH or PVL in preterm neonates.
Objective:
The association between high-frequency ventilation (HFV) and intraventricular hemorrhage (IVH) and periventricular leukomalacia (PVL) has been debated.
Purpose:
To determine if premature neonates treated with HFV are at greater risk for developing IVH and/or PVL than neonates treated with conventional ventilation, we completed a meta-analysis of all prospective randomized control trials comparing HFV and conventional ventilation in the management of respiratory distress syndrome.
Methods:
The meta-analysis included nine studies comparing HFV and conventional ventilation in the management of preterm neonates. To summarize the data, we calculated the difference in absolute risk for IVH and PVL between neonates treated with HFV and those treated with standard ventilation. These differences were combined to determine an overall difference in the absolute risk and its confidence interval. We examined the effect of estimated gestational age, birth weight, surfactant, and age at study entry on the results. Because one trial (HIFI study) was much larger than the other studies, it dominated the analysis, so we evaluated the data with and without including data from the HIFI trial.
Results:
The occurrences of IVH and PVL ranged from 14% to 47% and 5% to 16%, respectively. This variation may be explained by the difference in the populations of neonates treated. The meta-analysis showed that use of HFV was associated with an increased risk of PVL (odds ratio = 1.7 with a confidence interval of 1.06 to 2.74), but not IVH or severe (> or = grade 3) IVH. When the results of the HIFI study were excluded, there were no differences between HFV and conventional ventilation in the occurrence of IVH or PVL.
Conclusions:
The association between HFV and adverse neurologic outcomes is primarily influenced by the results of the HIFI trial. Meta-analysis of more recent studies does not confirm the findings of the HIFI trial and suggests that HFV is not associated with increased occurrence of IVH or PVL.