Comparison of Breathing Pattern During Neurally Adjusted Ventilatory Assist Ventilation and Pressure Support Ventilation

Comparison of Breathing Pattern During PSV and NAVA

Comparison of Breathing pattern during mechanical ventilation. Two modes of mechanical ventilation are compared (Pressure Support Ventilation and Neurally Adjusted Ventilatory Assist)

Eligibility : healthy subject without respiratory complications in the past

Subjects will breath spontaneously without mechanical ventilation, with Pressure Support Ventilation and with Neurally Adjusted Ventilatory Assist during.

Three levels of pressurisation will be tested : 5 cmH2O, 8 cmH2O and 12 cmH2O Duration of each condition will be about 15 minutes.

Measurements will include:Flow, airway pressure, SaO2, PtCO2, diaphragmatic electromyography, chest wall motion by optoelectronic plethysmography

Inclusion Criteria:

• Age > 18 years
• Healthy Subject without any chronic disease

Exclusion Criteria:

• Absence of consent
• Pregnant