Head Elevation in Prone Position

Influence of Head Elevation in Prone Position on Gas Exchange and Lung Mechanics in Patients With ALI/ARDS

Semi-recumbent position leads to improvement of gas exchange and lung mechanics in patients suffering from ALI or ARDS. Prone positioning leads to similar effects. To date, no data on the combination of these two positioning measures exist. The investigators hypothesize that head elevation in prone position leads to improvement in gas exchange and lung mechanics.

Inclusion Criteria:

• Mechanically ventilated
• ALI or ARDS
• No contraindications for prone position

Exclusion Criteria:

• Patient < 18 or > 89 years old
• Pregnancy
• Elevated intracranial pressure
• PaO2/FiO2 - ratio < 60
• ECMO
• Open abdomen
• Instable spine
• Malignant arrhythmias
• Severe hemodynamic instability