 To date, studies using NAVA technology have been limited to short term evaluations under 3 hours. No serious adverse events have been observed in patients enrolled in our 3-hour study of NAVA in patients with acute lung injury. All 15 patients successfully tolerated the period of ventilation i.e. there were no dropouts with NAVA and the stability of the blood gas parameters over time reveals the efficiency of this new mode of ventilation in regards to oxygenation. 