Ventilator Management in Prone Position

Introduction to Prone Positioning

The American Thoracic Society recommends maintaining optimized ventilation principles, including limitation of tidal volumes, prevention of derecruitment, and integration of spontaneous breathing components, when patients are placed in prone position 1

Tidal volume limitation: lung-protective ventilation strategies with tidal volumes ≤8 ml/kg predicted body weight should be continued, with evidence suggesting that lower tidal volumes provide even greater benefit 1
PEEP management: appropriate PEEP should be maintained to prevent derecruitment, with prone positioning and PEEP having an additive effect on improving oxygenation 1
Spontaneous breathing: can be maintained during prone positioning despite common practice of deep sedation 1

Oxygenation parameters should be assessed within 1-2 hours after prone positioning, and evaluated for potential hemodynamic changes, though prone positioning is generally hemodynamically well-tolerated 1

Minimum duration: prone position should be maintained for at least 12 hours, preferably 16 hours daily 1
Continuation criteria: prone positioning should be continued until improvement in supine oxygenation persists, or consider discontinuing after two unsuccessful attempts if no improvement in oxygenation is observed 1

Inadequate duration: prone sessions shorter than recommended 12-16 hours may limit effectiveness 1, 2
Delayed implementation: early application of prone positioning (within 48 hours of mechanical ventilation initiation) shows better outcomes 1
Improper patient selection: prone positioning is most beneficial in severe ARDS with PaO₂/FiO₂ <150 mmHg 1
Failure to maintain lung-protective ventilation: the mortality benefit from prone positioning requires limitation of tidal volume 1
Premature termination: prone positioning should be continued until clear improvement criteria are met rather than using arbitrary timeframes 1