Determining the optimal Neurally Adjusted Ventilatory Assist (NAVA) level remains challenging, and several methods have been suggested. However none of them seems easily utilisable. Thus the investigators propose to test a way of NAVA level titration according to ventilator comfort.
Physiological comparison of different levels of ventilator assistance during Neurally Adjusted Ventilatory Assist (NAVA) to evaluate the effect of these on tidal volume, inspiratoy activity, comfort scales. We propose to evaluate the ability to guide the titration according the patient's comfort scale. The intensity of the breathing sensations will be evaluated using the labeled visual analog scale (Banzett Scale).
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
NONE
Enrollment
15
Gold standard partial ventilator support: Pressure Support Ventilation performed with Servo-i® ventilator (MAQUET,Critical Care, Sweden). Pressure support ventilator assistance to obtain a tidal volume of 6-8 ml/kg of ideal body weight.
Partial ventilator support partial ventilation mode (NAVA) performed with Servo-i® ventilator (Maquet,Critical Care, Sweden). Different levels of neurally adjusted ventilatory assist are tested. Stepwise implementation of the NAVA level (steps of 25% ), returning to the " optimal " level between each evaluation (PSV 100%, NAVA 100%, 75%, 50%, 125%, 150%).
CHU de Caen
Caen, France
RECRUITINGComparison of ventilatory comfort with the physiological parameters when varying the levels of pressure support and Neurally Adjusted Ventilatory Assist (NAVA)
To prove the feasibility of neurally adjusted ventilatory assist (NAVA) level titration according to the ventilatory comfort felt by the patient. The ventilatory comfort will be evaluated using the labeled visual analog scale (Banzett scale).
Time frame: 24hr
Efficiency
The efficiency will be evaluated by using minute ventilation
Time frame: 24hr
Efficiency
The efficiency will be evaluated using arterial PCO2.
Time frame: 24hr
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