Emergency department blood alcohol level associates with injury factors and six-month outcome after uncomplicated mild traumatic brain injury

TRACK-TBI Investigators

Research output: Contribution to journalArticlepeer-review

Abstract

The relationship between blood alcohol level (BAL) and mild traumatic brain injury (mTBI) remains in need of improved characterization. Adult patients suffering mTBI without intracranial pathology on computed tomography (CT) from the prospective Transforming Research and Clinical Knowledge in Traumatic Brain Injury Pilot study with emergency department (ED) Glasgow Coma Scale (GCS) 13–15 and recorded blood alcohol level (BAL) were extracted. BAL ≥ 80-mg/dl was set as proxy for excessive use. Multivariable regression was performed for patients with six-month Glasgow Outcome Scale-Extended (GOSE; functional recovery) and Wechsler Adult Intelligence Scale Processing Speed Index Composite Score (WAIS-PSI; nonverbal processing speed), using BAL ≥ 80-mg/dl and <80-mg/dl cohorts, adjusting for demographic/injury factors. Overall, 107 patients were aged 42.7 ± 16.8-years, 67.3%-male, and 80.4%-Caucasian; 65.4% had BAL = 0-mg/dl, 4.6% BAL < 80-mg/dl, and 30.0% BAL ≥ 80-mg/dl (range 100–440-mg/dl). BAL differed across loss of consciousness (LOC; none: median 0-mg/dl [interquartile range (IQR) 0–0], <30-min: 0-mg/dl [0–43], ≥30-min: 224-mg/dl [50–269], unknown: 108-mg/dl [0–232]; p = 0.002). GCS < 15 associated with higher BAL (19-mg/dl [0–204] vs. 0-mg/dl [0–20]; p = 0.013). On univariate analysis, BAL ≥ 80-mg/dl associated with less-than-full functional recovery (GOSE ≤ 7; 38.1% vs. 11.5%; p = 0.025) and lower WAIS-PSI (92.4 ± 12.7, 30th-percentile vs. 105.1 ± 11.7, 63rd-percentile; p < 0.001). On multivariable regression BAL ≥ 80-mg/dl demonstrated an odds ratio of 8.05 (95% CI [1.35–47.92]; p = 0.022) for GOSE ≤ 7 and an adjusted mean decrease of 8.88-points (95% CI [0.67–17.09]; p = 0.035) on WAIS-PSI. Day-of-injury BAL > 80-mg/dl after uncomplicated mTBI was associated with decreased GCS score and prolongation of reported LOC. BAL may be a biomarker for impaired return to baseline function and decreased nonverbal processing speed at six-months postinjury. Future confirmatory studies are needed.

Original languageEnglish (US)
Pages (from-to)293-298
Number of pages6
JournalJournal of Clinical Neuroscience
Volume45
DOIs
StatePublished - Nov 2017

Keywords

  • Blood alcohol level
  • Functional outcome
  • Injury factors
  • Mild traumatic brain injury
  • Nonverbal processing speed

ASJC Scopus subject areas

  • Surgery
  • Neurology
  • Clinical Neurology
  • Physiology (medical)

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