Comfort of Patients Under Non Invasive Ventilation According to the Mask

A sub-nasal mask with a skirt that fits the nostrils and with a dedicated port for the nasogastric tube has recently been introduced. This interface has never been compared to nasal-oral masks. We hypothesise that such a sub-nasal mask increases comfort compared to a conventional naso-oral mask. The primary objective is to compare the comfort of the sub-nasal mask with that of a standard naso-oral mask.