Adiposity Distribution in Acute Respiratory Failure

"EIT will be used to guide individualized PEEP titration in mechanically ventilated patients with AHRF. Each subject will receive mechanical ventilation at two PEEP levels:~PEEP\_CLIN (set by the treating clinician)~PEEP\_TIT (identified using EIT to minimize alveolar collapse and overdistension)~Both levels will be maintained for 30 minutes in each body position, with continuous physiologic data collected during each phase."

Each subject will be ventilated in both the supine and prone positions. Positioning will follow institutional protocols and be coordinated with clinical staff to ensure safety. After supine assessments are completed, the patient will be transitioned to prone, followed by a recruitment maneuver to standardize lung volume history. The PEEP titration protocol will then be repeated in the prone position.