For ARDS, esophageal pressure-guided PEEP disappoints in EPVent-2 trial

  • Beitler JR & al.
  • JAMA
  • 18 Feb 2019

  • curated by Jenny Blair, MD
  • Clinical Essentials
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Takeaway

  • For patients with acute respiratory distress syndrome (ARDS), positive end-expiratory pressure (PEEP) titration guided by esophageal pressure (PES) offers no clear advantage over empirical high PEEP-FIO2.
  • Editorial discusses differences in protocol, results vs EPVent and concludes: “for most patients with moderate to severe ARDS, the use of a simple and widely available tool to adjust PEEP will result in similar clinical outcomes to those of a more invasive, costly, and cumbersome strategy.”

Why this matters

  • Benefit of PEEP optimization is unclear, and the process is difficult because it must not only improve oxygenation but also prevent ventilator-induced lung injury (VILI). 
  • Pleural pressure correlates with PES (measured by esophageal manometer).
  • PES-guided PEEP appeared advantageous in 2008 EPVent trial.

Key results

  • PES-guided vs empirical PEEP:
    • Primary outcome: no significant difference.
    • Death: no significant difference.
    • Days free from mechanical ventilation: no significant difference.

Study design

  • 14-hospital randomized clinical EPVent-2 (n=200).
  • Patients aged ≥16 years with moderate to severe ARDS were randomly assigned to receive PES-guided PEEP vs empirical high PEEP-FIO2.
  • Outcome: ranked composite score incorporating death and days free from mechanical ventilation among survivors through day 28.
  • Funding: NIH.

Limitations

  • Underpowered for meaningful survival differences. 
  • Prone positioning prohibited except as rescue.

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