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Related Experiment Videos

Interobserver variability in applying a radiographic definition for ARDS.

G D Rubenfeld1, E Caldwell, J Granton

  • 1Harborview Medical Center and the Division of Pulmonary and Critical Care Medicine, University of Washington, Seattle WA 98104, USA. nodrog@u.washington.edu

Chest
|November 13, 1999
PubMed
Summary
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The radiographic criterion for Acute Lung Injury (ALI) and Acute Respiratory Distress Syndrome (ARDS) shows significant interobserver variability. This inconsistency may impact clinical research and patient care, suggesting a need for definition refinement.

Area of Science:

  • Pulmonary Medicine
  • Radiology
  • Critical Care Medicine

Background:

  • Acute Lung Injury (ALI) and Acute Respiratory Distress Syndrome (ARDS) are critical conditions often diagnosed using the American-European Consensus Conference (AECC) definition.
  • This definition includes a radiographic criterion, but its reliability and accuracy have not been thoroughly evaluated by expert consensus.
  • There is a lack of assessment on the interobserver variability of the AECC radiographic criterion for ALI-ARDS.

Purpose of the Study:

  • To investigate the interobserver variability in the application of the American-European Consensus Conference (AECC) radiographic criterion for diagnosing ALI-ARDS.
  • To assess the consistency among experts when interpreting chest radiographs for ALI-ARDS according to the AECC definition.

Main Methods:

Related Experiment Videos

  • A survey-based study involving 21 experts in mechanical ventilation and ARDS.
  • Participants reviewed 28 randomly selected chest radiographs of hypoxemic patients (PaO2/FiO2 ratio < 300).
  • Experts determined if each radiograph met the AECC definition for ALI-ARDS.

    • Main Results:

    • Moderate interobserver agreement was observed (kappa = 0.55) in applying the AECC radiographic criterion for ALI-ARDS.
    • A significant portion of radiographs (43%) had near-complete agreement, while 32% had substantial disagreement among readers.
    • Reader interpretation of ALI-ARDS consistency varied widely (36% to 71%), with challenges noted in identifying mild infiltrates, effusions, and atelectasis.

    Conclusions:

    • The radiographic criterion in the current AECC definition for ALI-ARDS exhibits high interobserver variability among specialists.
    • This variability can lead to inconsistencies in defining ALI-ARDS patient populations across research centers and complicate the clinical application of research findings.
    • Modifications to the radiographic criterion or the use of reference radiographs are suggested to enhance the reliability of future ALI-ARDS definitions.