Mechanical Ventilation Guidelines for ARDS

Introduction to Ventilation Strategy

The Surviving Sepsis Campaign guidelines recommend a target tidal volume of 6 mL/kg predicted body weight (PBW) with an upper limit plateau pressure goal of 30 cm H₂O for patients with ARDS, based on high-quality evidence showing reduced mortality and increased ventilator-free days 1, 2

The American Thoracic Society and other medical societies endorse the 6 mL/kg PBW target as a strong recommendation, representing the cornerstone of lung-protective ventilation, with a significant reduction in mortality (31.0% vs 39.8%, P=0.007) and increased ventilator-free days compared to traditional 12 mL/kg volumes 1, 2

The European Society of Intensive Care Medicine recommends maintaining plateau pressure ≤30 cm H₂O as an absolute ceiling, even if this requires further reduction in tidal volume below 6 mL/kg PBW, to prevent ventilator-induced lung injury through alveolar overdistension 1, 2, 3
Target driving pressure (ΔP = plateau pressure - PEEP) ≤15 cm H₂O, as this parameter predicts mortality better than tidal volume or plateau pressure alone, with values ≥18 cm H₂O increasing right ventricular failure risk in ARDS 4

For sepsis-induced ARDS (moderate to severe), the recommended tidal volume is 6 mL/kg PBW (strong recommendation), with a plateau pressure ≤30 cm H₂O, and higher PEEP strategies over lower PEEP (weak recommendation, moderate quality evidence) 1, 2
For respiratory failure without ARDS, a tidal volume of 6-10 mL/kg PBW is acceptable, with a plateau pressure still maintained ≤30 cm H₂O 5, 3
For ACLF/cirrhosis with ALI, the recommended tidal volume is 6 mL/kg PBW (lung-protective strategy), with a plateau pressure <30 cm H₂O, and PEEP considerations including low PEEP (<10 cm H₂O) for mild ARDS and higher PEEP acceptable for moderate-severe ARDS with hemodynamic monitoring 5

Permissive hypercapnia may be necessary when using lower tidal volumes to prevent alveolar overdistension, with a weak recommendation for recruitment maneuvers for severe ARDS with refractory hypoxemia, and neuromuscular blockade for ≤48 hours when PaO₂/FiO₂ <150 mm Hg (weak recommendation) 6, 1, 2
A conservative fluid strategy is recommended for established ARDS without tissue hypoperfusion (strong recommendation) 1, 2

The American Thoracic Society and European Society of Intensive Care Medicine recommend using volume-controlled ventilation during the early phase of ARDS because it enables precise monitoring of plateau pressure and driving pressure, with no mortality or morbidity advantage of pressure-controlled versus volume-controlled ventilation for the same tidal volume 7
The American Thoracic Society and European Society of Intensive Care Medicine emphasize that volume-controlled ventilation is recommended in the early stage of ARDS because it facilitates measurement of respiratory mechanics and driving pressure, with no outcome difference between VCV and PCV when the same tidal volume is delivered 7

Transition to pressure-controlled ventilation may be appropriate later in the disease course during assisted breathing modes when patient comfort becomes a priority, according to the American Thoracic Society and European Society of Intensive Care Medicine 7
The American Thoracic Society and European Society of Intensive Care Medicine suggest considering switching to pressure-controlled ventilation if the patient develops dyssynchrony or increased work of breathing during assisted modes 7

The American Thoracic Society and European Society of Intensive Care Medicine recommend transitioning to weaning phase when sedation is being reduced and partial ventilator support is introduced 8

The American Thoracic Society and European Society of Intensive Care Medicine warn that pressure-controlled ventilation does not guarantee a fixed tidal volume, which can lead to inadvertent delivery of excessive volumes if lung compliance improves, or inadequate volumes if compliance worsens, and requires vigilant monitoring of delivered tidal volumes to ensure they remain within the 4-8 mL/kg predicted body weight range 7
The American Thoracic Society and European Society of Intensive Care Medicine emphasize the importance of optimizing PEEP, as higher PEEP strategies reduce mortality in moderate-severe ARDS (PaO₂/FiO₂ ≤200 mmHg) and can lower driving pressure 7