Anesthesia Workstation Performance in Pediatric Ventilation: Part 2. Characteristics during Pressure Support...

Area of Science:

• Anesthesiology
• Pediatric Critical Care
• Biomedical Engineering

Background:

• Ventilator technology in modern anesthesia workstations is advancing.
• The impact of these ventilators on pediatric patients remains incompletely understood.
• Performance variations across anesthesia workstation types are suspected.

Purpose of the Study:

• To evaluate the performance of modern anesthesia workstations during pediatric ventilation.
• To compare pressure support ventilation (PSV) and oxygenation rise times across different devices.
• To determine if workstation type influences ventilation outcomes in pediatric models.

Main Methods:

• Six anesthesia workstations were tested using respiratory models simulating preterm infants, neonates, infants, and toddlers.
• Key metrics included trigger response rate, trigger delay, and time to reach 50% peak inspiratory pressure during PSV.
• Oxygen concentration rise times were measured during pressure-controlled ventilation at varying fresh gas flows (1, 3, 10 L/min).

Main Results:

• Trigger response rates generally exceeded 90%, with trigger delays between 73-145 ms.
• Time to reach 50% peak pressure varied from 161-312 ms, showing less variability in larger pediatric models.
• Oxygen rise times decreased with increased fresh gas flow, but oxygen flush did not consistently improve oxygenation and risked high airway pressures.

Conclusions:

• Modern anesthesia workstations demonstrate satisfactory performance in pediatric pressure support ventilation.
• Increased fresh gas flow moderately accelerates oxygen concentration rise during pressure-controlled ventilation, with device-dependent effects.
• Oxygen flush offers no benefit for oxygenation and may endanger patients with excessive airway pressure.