Smartphone Application for Initiation of Protective Ventilation. Clinical Impact of Instrumental Dead Space Reduction

Inclusion Criteria: * Age \> 18 years old * Mechanical ventilation (control,assist control or SIMV mode) * haemodynamic stability (vasopressor \< 0.2 ug/kg/min) * no prone position schedule in the next 2 hours following procedure inclusion * presence of an Arterial catheter Exclusion Criteria: * ECMO or anticipate ECMO * body temperature \< 36.0 for post operative patient (cardiac surgery)