Performance of noninvasive ventilation modes on ICU ventilators during pressure support: a bench model study
- Laurence VignauxAffiliated withIntensive Care, University Hospital Email author
- , Didier TassauxAffiliated withIntensive Care, University HospitalAnesthesiology, University Hospital
- , Philippe JollietAffiliated withIntensive Care, University Hospital
Rent the article at a discountRent now
* Final gross prices may vary according to local VAT.Get Access
Noninvasive ventilation (NIV) is often applied with ICU ventilators. However, leaks at the patient-ventilator interface interfere with several key ventilator functions. Many ICU ventilators feature an NIV-specific mode dedicated to preventing these problems. The present bench model study aimed to evaluate the performance of these modes.
Design and setting
Bench model study in an intensive care research laboratory of a university hospital.
Eight ICU ventilators, widely available in Europe and featuring an NIV mode, were connected by an NIV mask to a lung model featuring a plastic head to mimic NIV conditions, driven by an ICU ventilator imitating patient effort. Tests were conducted in the absence and presence of leaks, the latter condition with and without activation of the NIV mode. Trigger delay, trigger-associated inspiratory workload, and pressurization were tested in conditions of normal respiratory mechanics, and cycling was also assessed in obstructive and restrictive conditions.
On most ventilators leaks led to an increase in trigger delay and workload, a decrease in pressurization, and delayed cycling. On most ventilators the NIV mode partly or totally corrected these problems, but with large variations between machines. Furthermore, on some ventilators the NIV mode worsened the leak-induced dysfunction.
The results of this bench-model NIV study confirm that leaks interfere with several key functions of ICU ventilators. Overall, NIV modes can correct part or all of this interference, but with wide variations between machines in terms of efficiency. Clinicians should be aware of these differences when applying NIV with an ICU ventilator.
KeywordsNoninvasive ventilation Mechanical ventilation Mechanical ventilators
- Performance of noninvasive ventilation modes on ICU ventilators during pressure support: a bench model study
Intensive Care Medicine
Volume 33, Issue 8 , pp 1444-1451
- Cover Date
- Print ISSN
- Online ISSN
- Additional Links
- Noninvasive ventilation
- Mechanical ventilation
- Mechanical ventilators
- Industry Sectors