What Researchers Did
Researchers evaluated how the Shangrila590 mechanical ventilator performed at different pressures in a hyperbaric chamber, testing small tidal volume settings from 50 to 300 mL across 1.0, 2.0, and 2.8 ATA.
What They Found
Delivered tidal volumes diverged significantly from set values as chamber pressure increased, and inspiratory peak pressures rose substantially. Breathing circuit compliance and test lung compliance both decreased with increasing ambient pressure.
What This Means for Canadian Patients
Critically ill patients requiring ventilatory support during HBOT are at risk from unrecognized volume and pressure deviations. Canadian hyperbaric centres managing ventilated patients need ventilator-specific performance data for safe operation.
Canadian Relevance
No direct Canadian connection identified.
Study Limitations
Testing was conducted on a bench model with a simulated test lung, which may not fully replicate performance in patients with variable lung compliance.