Synchronous intermittent mandatory ventilation modes compared with patient triggered ventilation during weaning

Area of Science:

• Neonatal medicine
• Pediatric critical care
• Respiratory physiology

Background:

• Mechanical ventilation is crucial for premature infants.
• Weaning from mechanical ventilation requires careful management.
• Synchronous intermittent mandatory ventilation (SIMV) and patient triggered ventilation (PTV) are common modes.

Purpose of the Study:

• To compare the efficacy of SIMV with combined pressure and rate reduction versus PTV with pressure reduction alone for weaning premature infants.
• To evaluate the duration of weaning and weaning failure rates between the two ventilation modes.

Main Methods:

• Two randomized trials were conducted involving premature infants (≤15 days old).
• Infants were allocated to either SIMV (with progressive rate reduction) or PTV (pressure reduction alone).
• Pressure was reduced to a standardized level based on infant size in both groups.

Main Results:

• No significant differences in weaning duration or failure rates were observed in the first trial (SIMV rate reduced to 20 breaths/minute).
• In the second trial (SIMV rate reduced to 5 breaths/minute), PTV resulted in a significantly shorter weaning duration (median 24 vs. 50 hours, p < 0.05).
• Weaning failure occurred in 2 infants with PTV versus 5 with SIMV in the second trial.

Conclusions:

• Combining pressure and rate reduction during SIMV offers no significant advantage over pressure reduction alone via PTV for weaning premature infants.
• Patient triggered ventilation (PTV) may be a more efficient method for weaning in certain scenarios.