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TOPLINE: 

In a study of mechanically ventilated emergency department (ED) patients, an oxygen titration guideline and educational intervention reduced severe hyperoxemia but increased hypoxemia, with no effect on severe hypoxemia, mortality, the ICU length of stay, or the hospital length of stay.

METHODOLOGY:

• Researchers conducted a single-center retrospective cohort study of 1111 mechanically ventilated adults (median age, 52 years; 70.1% men; 64.7% White, 16.5% Black, and 7.7% Asian individuals) at an academic tertiary care ED in Seattle between 2023 and 2024.
• The analysis included a 6-month preintervention phase (n = 625) and a 6-month postintervention phase (n = 486). The quality improvement intervention consisted of a bedside oxygen titration algorithm, with clinical guidance posted on the institute's online algorithms page and attached to ventilators, and brief repeated education for physicians and nurses.
• The primary outcome was severe hyperoxemia (PaO2 > 300 mm Hg) during the ED stay and 6 hours after hospital admission; safety outcomes included hypoxemia (PaO2 < 60 mm Hg) and severe hypoxemia (PaO2 < 50 mm Hg).
• The secondary outcomes included in-hospital mortality, the duration of mechanical ventilation, the ICU length of stay, and the total hospital length of stay.

TAKEAWAY:

• Severe hyperoxemia was less common in the postintervention cohort than in the preintervention cohort (30.0% vs 39.4%; adjusted odds ratio [aOR], 0.68; P = .01).
• Hypoxemia was more common in the postintervention cohort than in the preintervention cohort (13.0% vs 7.5% of patients; aOR, 1.87; P < .01), whereas the occurrence of severe hypoxemia did not differ significantly between the cohorts (3.4% vs 3.1% of patients; aOR, 0.91; P = .78).
• In-hospital mortality remained unchanged post-intervention (13.8% vs 14.2% of patients in the preintervention vs postintervention cohort; aOR, 0.88; P = .51), and mortality did not differ significantly by hyperoxemia status.
• The median duration of mechanical ventilation increased slightly post-intervention (adjusted incidence rate ratio [IRR], 1.19; P = .02), but no significant differences were noted in ICU length of stay (IRR, 0.94; P = .29) or hospital length of stay (IRR, 0.99; 95% CI, 0.87-1.13).

IN PRACTICE:

"Severe hyperoxemia is common, affecting over a third of mechanically ventilated patients in the ED," the authors wrote, further adding that "a QI [quality improvement] and educational initiative and oxygen titration guideline reduced exposure to severe hyperoxemia but was associated with an increase in hypoxemia. Future work is required to assess the sustainability of the intervention, investigate safety, and determine effects on clinical outcomes." 

SOURCE:

The study was led by Margaret L. Davis, MD, MPH, University of Washington, Division of Pulmonary, Critical Care, and Sleep Medicine, Seattle. It was published online on May 20, 2026, in The Journal of Emergency Medicine.

LIMITATIONS:

The study was limited by its single-center, before-and-after observational design, which restricted causal inference and may have introduced residual confounding. Additionally, the study was limited by potential seasonal and institutional practice changes, reliance on intermittently measured arterial blood gases that may have missed transient oxygenation abnormalities, and insufficient power to detect differences in clinical outcomes such as mortality and duration of mechanical ventilation.

DISCLOSURES:

The study received no specific funding. Three authors reported unrelated financial relationships, including receipt of research funding from the National Institutes of Health and the American Heart Association, service on advisory boards, participation in guideline committees, and receipt of industry support. Full disclosures are noted in the original article.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.