Acceleration during neonatal transport and its impact on mechanical ventilation

Area of Science:

• Neonatal critical care
• Transport medicine
• Biomedical engineering

Background:

• Critically ill neonates often require mechanical ventilation during interhospital transfers.
• Ambulance transport exposes these vulnerable infants to physical forces like acceleration and vibration.
• Understanding these forces' impact on neonatal ventilators is crucial for patient safety.

Purpose of the Study:

• To investigate acceleration experienced by neonates during emergency transfers.
• To determine if acceleration results from speed changes, directional changes, or road vibrations.
• To assess the impact of these forces on neonatal ventilator performance and patient-ventilator interactions.

Main Methods:

• Observational study analyzing data from 109 infant transfers.
• Downloaded ventilator parameters and acceleration data at high sampling rates.
• Computationally analyzed acceleration (magnitude, direction, frequency) and ventilator parameters (maintenance, variability, pressure-volume loops).

Main Results:

• Most infants experienced occasional accelerations exceeding 5 m/s², primarily due to road vibrations rather than speed or turning.
• Ventilator parameters and their maintenance were not significantly affected by vibration intensity or vehicle movement.
• Intense vibration significantly increased the irregularity of pressure-volume ventilator loops.

Conclusions:

• Neonates undergoing emergency transport are exposed to substantial acceleration and vibration.
• While overall mechanical ventilation parameters are maintained, intense vibration negatively impacts pressure-volume loop characteristics.
• Further research may be needed to mitigate the effects of vibration on patient-ventilator interactions during transport.