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Updated: Dec 22, 2025
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Author Spotlight: Unraveling the Impact of Mechanical Ventilation on Diaphragm Function and Patient Outcomes
Published on: November 3, 2023
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Work of Breathing in Mechanically Ventilated Preterm Neonates
Aggeliki Vervenioti1, Sotirios Fouzas, Sotirios Tzifas
1All authors: Neonatal Intensive Care Unit, Department of Pediatrics, University of Patras Medical School, Patras, Greece.
Summary
Patient-triggered ventilation modes, like assist control, reduce the work of breathing in preterm infants compared to intermittent mandatory ventilation. Less mature infants show greater benefit from assist control strategies.
Area of Science:
- Neonatal Medicine
- Pediatric Critical Care
- Respiratory Physiology
Background:
- Mechanical ventilation is crucial for preterm infants but can impose significant work of breathing on the diaphragm.
- Optimizing ventilation modes is essential to minimize diaphragmatic workload and support lung development in vulnerable newborns.
- Understanding the impact of different ventilation modalities on diaphragmatic pressure-time product is key for weaning strategies.
Purpose of the Study:
- To compare the imposed work of breathing, measured by the diaphragm's pressure-time product, across various mechanical ventilation modes in preterm infants undergoing weaning.
- To investigate the relationship between postmenstrual age and the diaphragmatic workload imposed by different ventilation settings.
Main Methods:
- A prospective observational crossover study was conducted in a tertiary care neonatal unit.
- Forty preterm infants (gestational age ≤ 37 weeks) were ventilated in assist control, synchronized intermittent mandatory ventilation (SIMV), and intermittent mandatory ventilation (IMV) modes.
- Diaphragmatic pressure-time product was calculated using transdiaphragmatic pressure measurements, with SIMV combined with pressure support (SIMV-PS) assessed in a subset.
Main Results:
- Assist control ventilation resulted in the lowest diaphragmatic pressure-time product (125.5 ± 61.8 cm H2O × s × min), significantly lower than SIMV (165.8 ± 58.8) and IMV (224.2 ± 112.8).
- The difference in diaphragmatic workload between assist control and IMV/SIMV was inversely related to postmenstrual age.
- In the SIMV-PS subgroup, IMV imposed a higher workload than assist control or SIMV-PS75.
Conclusions:
- Patient-triggered ventilation modalities, particularly assist control, impose less work of breathing on the diaphragm compared to IMV in preterm infants.
- The benefit of assist control ventilation strategies is more pronounced in less mature infants, as indicated by the inverse relationship between postmenstrual age and workload differences.
- These findings support the use of patient-triggered ventilation to optimize diaphragmatic function during weaning in preterm neonates.
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