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Synchronized mechanical ventilation for respiratory support in newborn infants
A Greenough1, A D Milner, G Dimitriou
1Dept of Child Health, King's College School of Medicine and Dentistry, Bessemer Road, London, UK, SE5 9PJ.
The Cochrane Database of Systematic Reviews
|October 21, 2004
Summary
Synchronized mechanical ventilation, including high frequency positive pressure ventilation (HFPPV) and triggered ventilation (PTV/SIMV), reduces airleaks and ventilation duration in neonates compared to conventional methods. Further research is needed to confirm benefits and optimize ventilator design.
Area of Science:
- Neonatal respiratory support
- Mechanical ventilation strategies
- Pulmonary mechanics in infants
Background:
- Synchronized mechanical ventilation aligns positive airway pressure with spontaneous inspiration.
- This synchronization aims to improve gas exchange at lower pressures, reducing barotrauma, airleaks, and chronic lung disease.
- Methods include manipulating conventional ventilation or using patient-assisted ventilation.
Purpose of the Study:
- To compare the efficacy of synchronized ventilation (HFPPV, PTV, SIMV) versus conventional mechanical ventilation (CMV) in neonates.
- To compare different types of triggered ventilation (PTV vs. SIMV).
Main Methods:
- Systematic review and meta-analysis of randomized and quasi-randomized controlled trials (1985-2004).
- Included studies compared HFPPV or PTV/SIMV to CMV, or PTV to SIMV in neonates.
- Outcomes assessed: mortality, airleaks (pneumothorax, PIE), severe intra-cerebral hemorrhage, chronic lung disease, and duration of ventilation/weaning.
Main Results:
- High frequency positive pressure ventilation (HFPPV) significantly reduced the risk of airleaks (pneumothorax) compared to conventional mechanical ventilation (CMV).
- Patient triggered ventilation/synchronous intermittent mandatory ventilation (PTV/SIMV) was associated with a shorter duration of ventilation compared to CMV.
- A trend towards shorter weaning duration was observed with PTV compared to SIMV; no significant reduction in chronic lung disease or significant mortality differences were found.
Conclusions:
- Both HFPPV and triggered ventilation demonstrate benefits in reducing airleaks and ventilation duration, respectively, compared to conventional ventilation.
- The precise mechanism of benefit (synchronization) could not be confirmed due to lack of complex respiratory monitoring in trials.
- Further trials are recommended to explore other benefits of synchronized ventilation, emphasizing optimization of trigger and ventilator design.