Study of Eye Pressure as a Predictor of Intracranial Pressure in the Acutely Head-Injured Population

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00534157
Recruitment Status : Completed
First Posted : September 24, 2007
Last Update Posted : September 24, 2007
Information provided by:
Ohio State University

Brief Summary:
The purpose of this study is to determine if the pressure in the eye of a severely head-injured person correlates with the pressure in the person's skull. This is a prospective study of patients aged 18 and older who have experienced a traumatic closed head injury and are intubated either before or during the time they are in the Emergency Department (ED). Identified patients have an eye pressure measurement performed in the trauma bay by an OSU ED physician not involved in their care. Information about their hospital stay, including the first brain pressure measurement if a such a measuring device is used, will be collected. In addition, the outcome of their hospital stay will be recorded.

Condition or disease
Craniocerebral Trauma

Detailed Description:

Traumatic brain injury (TBI) is a leading cause of morbidity and mortality in the United States, with an estimated 1.5 million American sustaining a TBI and 50,000 people dying from a TBI each year. While the immediate, or primary, injury causes significant damage, secondary injury is caused by cerebral edema, increased intracranial pressure, and resultant hypoperfusion and ischemia. Elevated intracranial pressure is strongly associated with poor recovery and death; failure to control intracranial pressure is likewise associated with poor outcomes and mortality.

Early detection of elevated ICP allows for the initiation of early therapy. However, patients with significant head injuries are often intubated for airway protection. The sedation required for intubation obscures the ED neurologic exam. Precise measurement of elevated ICP has required invasive monitoring via ventriculostomy. Yet this method is only provided at set institutions with neurosurgical services. Further there are distinct time delays between the trauma occurrence, transportation to a facility with neurosurgical services and placement of ventriculostomies. There is at the forefront, then, to establish non-invasive measures of ICP that are both time efficient and reliable.

Previous studies, including a pilot study conducted at this institution, showed a correlation between intraocular and intracranial pressure. However, this relationship has not been tested in an acute care trauma setting. We propose an observational cohort study of critically injured trauma patients with suspected closed head injury. Patients requiring intubation and mechanical ventilation pose a significant challenge to assess neurologically, as they are almost always sedated and often chemically paralyzed to facilitate airway management. Therefore, it is in this population of intubated trauma patients with suspected head injury that we will evaluate the use of tonometry to predict intracranial pressure from intraocular pressure.

Study Type : Observational
Actual Enrollment : 37 participants
Observational Model: Defined Population
Primary Purpose: Screening
Time Perspective: Cross-Sectional
Time Perspective: Prospective
Official Title: Intraocular Pressure as a Predictor of Intracranial Pressure in the Acutely Head-Injured Population
Study Start Date : June 2004
Actual Study Completion Date : April 2007

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Head Injuries
U.S. FDA Resources

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patients with suspected acute traumatic head injury
  • Intubated prior to arrival in the Emergency Department or in the Emergency Department, including patients transferred from other facilities

Exclusion Criteria:

  • Too unstable to allow the investigator access to the head of the bed to perform tonometry.
  • Severe ocular or facial trauma such that an intact globe is not accessible
  • Known history of glaucoma
  • Penetrating head injury
  • Patients that undergo operative decompression prior to the placement of an intracranial pressure monitor may be screened in the trauma bay and have an intraocular pressure obtained; however, these patients will not be included in the intraocular / intracranial pressure analysis.
  • Known allergy to latex or tetracaine

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00534157

United States, Ohio
The Ohio State University Medical Center
Columbus, Ohio, United States, 43210
Sponsors and Collaborators
Ohio State University
Principal Investigator: Brian C Hiestand, MD The Ohio State University Department of Emergency Medicine Identifier: NCT00534157     History of Changes
Other Study ID Numbers: 2004H0126
First Posted: September 24, 2007    Key Record Dates
Last Update Posted: September 24, 2007
Last Verified: March 2007

Keywords provided by Ohio State University:
intracranial pressure
intraocular pressure

Additional relevant MeSH terms:
Craniocerebral Trauma
Trauma, Nervous System
Nervous System Diseases
Wounds and Injuries