Hamaekers et al. Rescue ventilation through a small-bore transtracheal cannula in severe hypoxic pigs using expiratory ventilation assistance. Anesth Analg. 2015 Apr; 120 (4):890-4

The workgroup of Prof. Enk showed in severe hypoxic pigs quickly restored oxygenation after ventilation with Expiratory Ventilation Assistance (EVA) in cases of a completely or partially obstructed upper airway. Reoxygenation and ventilation were less efficient when the upper airway was completely unobstructed.