Gas trapping during high frequency positive pressure ventilation using conventional ventilators.

Area of Science:

• Neonatal Medicine
• Pediatric Respiratory Medicine
• Critical Care

Background:

• Respiratory distress syndrome (RDS) is a common condition in preterm infants.
• Mechanical ventilation is a cornerstone of RDS management.
• Optimizing ventilator settings is crucial to minimize complications.

Purpose of the Study:

• To compare inspiratory and expiratory volumes in preterm infants with RDS.
• To evaluate the incidence of gas trapping at two different ventilator rates (60 and 120 breaths/min).
• To identify factors associated with gas trapping during mechanical ventilation.

Main Methods:

• Inspiratory and expiratory volumes were measured in 51 preterm infants with RDS.
• Ventilator rates of 60 and 120 breaths/min were compared.
• Gas trapping was assessed, and its association with infant paralysis and gestational age was analyzed.

Main Results:

• Gas trapping was not observed at 60 breaths/min.
• Gas trapping occurred in 11 infants at 120 breaths/min.
• Gas trapping was more frequent in paralyzed infants and those older than 31 weeks gestational age (P < 0.05).
• The median change in functional residual capacity due to gas trapping was 3.8 ml/kg.

Conclusions:

• Ventilator rates of 120 breaths/min are generally safe for non-paralyzed preterm infants with RDS.
• Higher rates (120 breaths/min) should be avoided in paralyzed preterm infants, particularly those more mature than 31 weeks.
• Careful consideration of ventilator settings is necessary to prevent gas trapping and optimize respiratory support in preterm infants.