Trial Parameters
Brief Summary
To investigate global and regional changes in lung ventilation and perfusion induced by prone position in ARDS patients assessed by 3D-EIT. And to investigate the difference between 2D-EIT and 3D-EIT in prone position monitoring.
Eligibility Criteria
Inclusion Criteria: * patients on mechanical ventilation. * Diagnosis of ARDS was based on the Berlin definition * Patients in need of prone position because of clinical condition Exclusion Criteria: * Under 18 years of age. * Pregnant women; * Ribcage malformation * Any contraindication to the use of EIT (e.g. automatic implantable cardioverter defibrillator, and implantable pumps).