Nationwide trauma cohorts find no clear unique GCS 8 intubation threshold

A two-era retrospective study of more than 138,000 adults in Japan’s trauma registry found intubation was more frequent at GCS 8 than 9, but did not establish that this difference was unique to that boundary. Model comparisons did not favor adding a discrete GCS 8/9 threshold; the observational findings do not show whether changing an intubation rule would improve outcomes.

Intubation was more frequent at GCS 8 than 9.
The contrast was reproduced across two registry eras.
Model comparisons did not favor a discrete GCS 8/9 step.
The study cannot determine the effect of changing intubation rules.

Researchers analyzed adults in two Japan Trauma Data Bank cohorts: 71,988 patients treated at 190 hospitals in 2008–2014 and 66,417 at 209 hospitals in 2019–2023. Eligible patients were transported directly from the scene, had a valid hospital-arrival Glasgow Coma Scale (GCS) score, and had no recorded prehospital advanced airway or cardiopulmonary support. Outcomes included severe head injury, in-hospital death, urgent cranial surgery and post-arrival intubation. The investigators assessed whether GCS 8 versus 9 marked an unusual change beyond the graded relationship between GCS and outcomes.

Recorded intubation was 9.1 and 10.6 percentage points more frequent at GCS 8 across the two eras; the pooled adjusted odds ratio was 1.61 (95% CI, 1.36–1.91). Differences in prognosis and cranial surgery between scores 8 and 9 were imprecise. Other adjacent GCS scores also showed intubation contrasts. Prespecified Bayesian information criterion comparisons favored the graded model over one adding a discrete GCS 8/9 step for every outcome in both eras, including a spline sensitivity analysis.

The replicated intubation contrast does not establish that GCS 8 is a unique threshold, and the analyses could neither establish nor exclude local exceptionality. Registry observations cannot determine whether maintaining, changing or abandoning an intubation rule improves outcomes. The study was supported by the Japan Society for the Promotion of Science; the authors reported no competing interests.

In practice

For clinicians using GCS in trauma airway assessment, this study found that recorded post-arrival intubation was more common at GCS 8 than 9 in two Japanese registry eras, but the difference was not shown to be unique to that boundary. Prespecified model comparisons did not favor adding a discrete 8/9 step. Because this was an observational registry study and did not test outcomes under alternative rules, it does not establish that clinicians should maintain, change or abandon a GCS-based intubation threshold.

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Source

Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine: Reproducible intubation contrast without evidence of a unique threshold at Glasgow Coma Scale 8: a two-era nationwide retrospective cohort study ↗

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