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High and conventional rates of positive pressure ventilation
Insights
High frequency positive pressure ventilation improved oxygenation in some preterm infants with respiratory distress syndrome. However, some infants experienced decreased oxygen levels, suggesting individualized ventilation strategies are crucial.
Area of Science:
- Neonatal Medicine
- Pediatric Pulmonology
- Respiratory Physiology
Background:
- Idiopathic respiratory distress syndrome (IRDS) is a common cause of respiratory failure in preterm infants.
- Conventional mechanical ventilation can be challenging in infants with spontaneous respiratory efforts.
- Optimizing ventilation strategies is critical for improving outcomes in neonates.
Purpose of the Study:
- To compare the efficacy of high frequency positive pressure ventilation (HFPPV) versus conventional rate ventilation (CRV) in preterm infants with IRDS.
- To assess the impact of HFPPV on transcutaneous oxygen levels (TcPo2) in infants with varying respiratory effort.
- To identify factors influencing ventilator tolerance in this population.
Main Methods:
- A comparative study involving 23 preterm infants diagnosed with IRDS.
- Infants were ventilated using both HFPPV (100 breaths/min) and CRV.
- Transcutaneous oxygen pressure (TcPo2) was monitored to assess gas exchange.
- Infants were categorized based on spontaneous respiratory efforts during ventilation.
Main Results:
- Six of nine infants with spontaneous efforts showed improved TcPo2 (mean 18.5% increase) with HFPPV.
- Two infants had no change, and one experienced a TcPo2 fall with HFPPV.
- Among apneic infants, five showed a TcPo2 fall (mean 19% decrease) with CRV at 100 breaths/min.
- Six infants required increased fraction of inspired oxygen (FIO2) when transitioning to CRV, often linked to increased spontaneous efforts.
Conclusions:
- HFPPV may benefit oxygenation in select preterm infants with IRDS exhibiting spontaneous respiratory efforts.
- Ventilator intolerance at conventional rates may be associated with increased spontaneous breathing.
- Individualized assessment of respiratory effort and ventilator settings is essential for optimal management of neonatal respiratory distress.
Abstract:
We compared high frequency positive pressure ventilation with conventional rate ventilation in 23 preterm infants with the idiopathic respiratory distress syndrome. Nine infants (10 studies) were making spontaneous respiratory efforts during conventional ventilation that abated at 100 breaths per minute. Six of these showed an increase in TcPo2 of at least 10% at the higher rate (mean 18.5%). Two babies showed no change during high frequency positive pressure ventilation, and in one baby (the largest) the TcPo2 fell. Eight infants were apnoeic at both ventilator rates: five suffered a fall in TcPo2 of at least 10% at 100 breaths per minute (mean 19%) and three were unchanged. A further six infants (seven studies) would not tolerate a reduction in rate from 100 breaths per minute without an increase in FIO2. Failure to tolerate a conventional ventilator rate in these circumstances seemed related to the onset or a noticeable increase in spontaneous respiratory efforts.