This trial will study the impact of a combined strategy to prevent microaspiration of oropharyngeal secretions or gastric content using automated subglottic secretion drainage and/or continuous cuff pressure monitoring. These measures aim at preventing secretions of oropharyngeal or gastric origin from entering lower respiratory tracts of patients under invasive mechanical ventilation in intensive care units (ICU), referred to as microaspiration, in the hope of preventing ventilator-associated pneumonia, a condition associated with patient outcome worsening. Patients will be randomly assigned to one of four groups: a combined strategy group using both automated techniques, 2 groups using either one or the other automated technique, and a control group using standard of care. Microaspiration will be detected by measuring concentration of oropharyngeal (amylase) or gastric (pepsin) enzymes in tracheal aspirates.

Subglottic secretion drainage will be performed using an automated bedside device. Cuff pressure will be monitored manually.

Inclusion Criteria:

Adult patients (> 18 years-old) admitted to the ICU Mechanical ventilation duration expected to be > 48 h Intubated with a tracheal tube allowing subglottic secretion drainage

Exclusion Criteria:

Ongoing pregnancy Patients lacking health insurance Patients lacking legal capacity Moribund patients (expected to die in the first 24 h of ICU stay) Patients with specific oropharyngeal conditions (e.g. severe soft tissue infections of the neck, pharyngeal or laryngeal surgery, history of larynx or pharynx irratidation)