Dead-space washout by split-flow ventilation. A new method to reduce ventilation needs in premature infants

Area of Science:

• Neonatal Medicine
• Respiratory Physiology
• Medical Engineering

Background:

• Chronic lung disease is a significant complication in preterm infants, often linked to volutrauma from mechanical ventilation.
• High tidal volumes during ventilation contribute to lung injury in premature neonates.

Purpose of the Study:

• To evaluate the efficacy of a novel split-flow ventilation method in reducing ventilatory effort in preterm infants.
• To assess if diminishing apparatus dead space with split-flow ventilation can mitigate volutrauma.

Main Methods:

• Split-flow ventilation involves flushing apparatus dead space with fresh gas during the expiratory pause.
• A pilot study compared conventional ventilation with split-flow ventilation in 17 preterm infants (<2,000 g) over 12-hour periods.
• Ventilatory effort was assessed by measuring mean per-minute ventilation and the ventilation index.

Main Results:

• Split-flow ventilation significantly reduced mean per-minute ventilation per kilogram of body weight (0.314 to 0.190 l/kg/min, p <0.001).
• The ventilation index also showed a significant decrease from 28.47 to 16.10 (p <0.001) with split-flow ventilation.
• These findings indicate a substantial reduction in ventilatory load.

Conclusions:

• Split-flow ventilation is an effective method for reducing apparatus dead space in preterm infants.
• The reduction in dead space leads to a significant decrease in overall ventilatory effort.
• This technique shows promise in preventing volutrauma and associated chronic lung disease in neonates.