Response to intracranial hypertension treatment as a predictor of death in patients with severe traumatic brain injury

Clinical article

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  • 1 Department of Neurosurgery, University of Rochester Medical Center, Rochester;
  • 2 Departments of Public Health and
  • 3 Neurological Surgery, Weill Cornell Medical College; and
  • 6 Brain Trauma Foundation, New York, New York;
  • 5 Department of Medical Informatics and Epidemiology, Oregon Health & Science University, Portland, Oregon; and
  • 4 Department of Clinical Neuroscience, Division of Clinical CNS Research, Section of Neurosurgery, Karolinska Institute, Stockholm, Sweden
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Object

The normalization of increased intracranial pressure (ICP) in patients with severe traumatic brain injury (TBI) is assumed to limit secondary brain injury and improve outcome. Despite evidence-based recommendations for monitoring and treatment of elevated ICP, there are few studies that show an association between response to ICP-directed therapeutic regimens and adjusted mortality rate. This study utilizes a large prospective database to examine the effect of response to ICP-lowering therapy on risk of death within the first 2 weeks of injury in patients who sustained TBI and are older than 16 years.

Methods

The current study is based on 1426 patients with severe TBI (Glasgow Coma Scale [GCS] score < 9) of whom 388 were treated for elevated ICP (> 25 mm Hg) between 2000 and 2008 at 22 trauma centers enrolled in a New York State quality improvement program. This prospectively collected database also contains information including age, admission GCS score, pupillary status, CT scanning parameters, and hypotension, which are all known early prognostic indicators of death. Treatment of elevated ICP consisted of administration of mannitol, hypertonic saline, barbiturates, and/or drainage of CSF or decompressive craniectomy. The factors predicting ICP response to treatment and predicting death at 2 weeks were evaluated using logistic regression analyses.

Results

Increasing age and fewer hours of elevated ICP on Day 1 were found to be significant predictors (p = 0.001 and 0.0003, respectively) of a positive response to treatment. Response to ICP-lowering therapy (p = 0.03), younger age (p < 0.0001), fewer hours of elevated ICP (p < 0.0001), and absence of arterial hypotension on Day 1 (p = 0.001) significantly predicted reduced risk of death.

Conclusions

Patients who responded to ICP-lowering treatment had a 64% lower risk of death at 2 weeks than those who did not respond after adjusting for factors that independently predict risk of death.

Abbreviations used in this paper: GCS = Glasgow Coma Scale; ICP = intracranial pressure; TBI = traumatic brain injury.

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Contributor Notes

Address correspondence to: Jamshid Ghajar, M.D., Ph.D., Department of Neurological Surgery, Weill Cornell Medical College, Starr Building, Room 651, 525 East 68th Street, Box 99, New York, New York 10021. email: jam@ghajar.net.

Please include this information when citing this paper: published online January 7, 2011; DOI: 10.3171/2010.11.JNS101116.

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