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Elective high-frequency oscillatory ventilation in preterm infants with respiratory distress syndrome: an individual
Filip Cools1, Lisa M Askie, Martin Offringa
1Department of Neonatology, Universitair Ziekenhuis Brussels, Belgium. filip.cools@uzbrussel.be
Insights
High-frequency oscillatory ventilation (HFOV) versus conventional ventilation for preterm infants with respiratory distress syndrome remains uncertain. This individual patient data meta-analysis will clarify HFOV efficacy and safety, exploring patient risk factors and ventilation strategies.
Area of Science:
- Neonatal Medicine
- Pediatric Respiratory Medicine
- Clinical Trial Methodology
Background:
- Uncertainty persists regarding the efficacy and safety of high-frequency oscillatory ventilation (HFOV) compared to conventional ventilation for preterm infants with respiratory distress syndrome (RDS).
- Clinical practice varies globally due to unexplained heterogeneity in trial results and unanswered questions about HFOV's effects across different infant risk profiles, ventilation strategies, and timing of initiation.
- Re-analysis of individual patient data from existing randomized controlled trials (RCTs) offers a method to address these critical clinical questions without new trials.
Purpose of the Study:
- To conduct a systematic review with meta-analysis of individual patient data (IPD) to estimate the effect of HFOV on the combined outcome of death or bronchopulmonary dysplasia (BPD) or severe adverse neurological events in preterm infants.
- To explore whether the effect of HFOV differs based on infant risk profiles, including gestational age, intrauterine growth restriction, lung disease severity, and antenatal corticosteroid exposure.
- To investigate the influence of effect modifiers such as ventilator device, ventilation strategy, and delay in initiating HFOV.
Main Methods:
- Centralized collection, validation, and re-analysis of individual patient data from all relevant RCTs comparing HFOV to conventional ventilation in preterm infants with RDS.
- Systematic review and individual patient data meta-analysis methodology, a novel approach in neonatology for this specific research question.
- Exploratory analyses to assess effect modification by infant characteristics and ventilation parameters.
Main Results:
- Individual patient data meta-analysis will provide robust estimates of HFOV's effect on key neonatal outcomes.
- Identification of specific infant subgroups that may benefit more or less from HFOV.
- Quantification of the impact of ventilation strategies and timing on treatment outcomes.
Conclusions:
- The PreVILIG Collaboration (Prevention of Ventilator Induced Lung Injury Group) has been established, pooling expertise from original RCT investigators.
- This IPD meta-analysis represents a significant methodological advancement in neonatal research.
- Anticipated availability of final results by the end of 2009 will inform clinical guidelines and improve the management of respiratory distress syndrome in preterm infants.
Background:
Despite the considerable amount of evidence from randomized controlled trials and meta-analyses, uncertainty remains regarding the efficacy and safety of high-frequency oscillatory ventilation as compared to conventional ventilation in the early treatment of respiratory distress syndrome in preterm infants. This results in a wide variation in the clinical use of high-frequency oscillatory ventilation for this indication throughout the world. The reasons are an unexplained heterogeneity between trial results and a number of unanswered, clinically important questions. Do infants with different risk profiles respond differently to high-frequency oscillatory ventilation? How does the ventilation strategy affect outcomes? Does the delay--either from birth or from the moment of intubation--to the start of high-frequency oscillation modify the effect of the intervention? Instead of doing new trials, those questions can be addressed by re-analyzing the individual patient data from the existing randomized controlled trials.
Methods/Design:
A systematic review with meta-analysis based on individual patient data. This involves the central collection, validation and re-analysis of the original individual data from each infant included in each randomized controlled trial addressing this question.The study objective is to estimate the effect of high-frequency oscillatory ventilation on the risk for the combined outcome of death or bronchopulmonary dysplasia or a severe adverse neurological event. In addition, it will explore whether the effect of high-frequency oscillatory ventilation differs by the infant's risk profile, defined by gestational age, intrauterine growth restriction, severity of lung disease at birth and whether or not corticosteroids were given to the mother prior to delivery. Finally, it will explore the importance of effect modifying factors such as the ventilator device, ventilation strategy and the delay to the start of high-frequency ventilation.
Discussion:
An international collaborative group, the PreVILIG Collaboration (Prevention of Ventilator Induced Lung Injury Group), has been formed with the investigators of the original randomized trials to conduct this systematic review. In the field of neonatology, individual patient data meta-analysis has not been used previously. Final results are expected to be available by the end of 2009.
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