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Mortality and morbidity associated with pressure- and volume-limited infant ventilators
Insights
Pressure-limited (PL) and volume-limited (VL) ventilation showed no significant differences in infant survival or lung injury for severe hyaline membrane disease (HMD). Both ventilation methods yielded similar outcomes in this controlled study.
Area of Science:
- Neonatology
- Pediatric critical care
- Respiratory physiology
Background:
- Severe hyaline membrane disease (HMD) in infants often necessitates mechanical ventilation.
- Distinguishing between pressure-limited (PL) and volume-limited (VL) ventilation strategies is crucial for optimizing respiratory support.
- Previous research has not definitively established the superiority of PL over VL ventilation in this vulnerable population.
Purpose of the Study:
- To prospectively compare the efficacy of pressure-limited (PL) versus volume-limited (VL) mechanical ventilation in infants with severe HMD.
- To evaluate the impact of these ventilation modes on mortality and key morbidity indicators.
Main Methods:
- A prospective controlled study involving 40 infants with severe HMD requiring mechanical ventilation.
- Infants were alternately assigned to receive either PL ventilation (low peak inspiratory pressures, prolonged inspiratory times) or VL ventilation (high peak inspiratory pressures, prolonged expiratory times).
- Ventilation criteria included specific thresholds for PaO2, PaCO2, FIO2, and CPAP, alongside cases of severe perinatal asphyxia.
Main Results:
- No statistically significant differences were observed between the PL and VL groups regarding survival rates.
- Incidence of pneumothorax and pulmonary interstitial emphysema did not differ significantly between the two ventilation strategies.
- Rates of bronchopulmonary dysplasia were comparable between infants receiving PL and VL ventilation.
Conclusions:
- Pressure-limited and volume-limited ventilation strategies appear to yield similar clinical outcomes in infants with severe hyaline membrane disease.
- Neither ventilation mode demonstrated a significant advantage in reducing mortality or major respiratory morbidities.
- Further research may explore nuanced differences or specific patient subgroups where one mode might be preferred.
Abstract:
The effect of pressure-limited (PL) and volume-limited (VL) ventilation on mortality and morbidity in infants with severe hyaline membrane disease (HMD) was examined in a prospective controlled study. Criteria for mechanical ventilation were PaO2 value of 50 mm Hg or less or a Paco2 value of 70 mm Hg or greater, while the infant was receiving nasal continuous positive airway pressure (CPAP) at oxygen concentrations (FIO2) of 0.8 or greater and CPAP of 8 cm H2O or greater; HMD associated with severe perinatal asphyxia requiring mechanical ventilation in the delivery room. Consecutive patients were alternately assigned to receive either PL or VL ventilation. Twenty infants were ventilated with PL machines using low peak inspiratory pressures (mean maximum inspiratory pressure of 28 cm H2O) and prolonged inspiratory times. Twenty other infants were ventilated with VL machines, using essentially unlimited peak inspiratory pressures (mean maximum inspiratory pressure of 62 mm H2O) and prolonged expiratory times. There were no significant differences in survival, incidence of pneumothorax or pulmonary interstitial emphysema, or noteworthy bronchopulmonary dysplasia.