Non invasive ventilation has been proposed to reduce the incidence of ventilatory dysfunction following abdominal aortic surgery. However, the nasogastric tube reduces the airtightness of the facial mask used to perform non invasive ventilation and induces air leaks. The use of a helmet reduces air leaks, thus seems adequate to ensure patient-ventilator interface. However, the high dead space related to helmet volume is responsible for asynchrony between patient demand and ventilatory support delivery. The investigators hypothesized driving the ventilator based on a neural signal (diaphragm electrical activity) would reduce patient-ventilator asynchronies.
Study Type
OBSERVATIONAL
Enrollment
10
In ICU following abdominal aortic surgery, in extubated patient, non-invasive ventilation was performed as follows: * facial mask with non-invasive pressure support ventilation mode to define settings for helmet ventilation * helmet use with non-invasive pressure support ventilation mode to define adequate settings * helmet use with neurally adjusted ventilatory assist mode, based on previous settings
Groupe Hospitalier Pitie Salpetriere, Department of Anesthesiology and Critical Care
Paris, France
Triggering delay
Duration between the onset of neural inspiration and the onset of insufflation
Time frame: Every inspiration, for 10 minutes
Cycling off delay
Delay between the end of neural inspiration and the end of insufflation
Time frame: Every inspiration, for 10 minutes
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