title: Intracranial Pressure Assessment in Traumatic Head Injury with Hemorrhage Via Optic Nerve Sheath Diameter.
abstract: Our purpose was to improve the technique of measuring optic nerve sheath diameter (ONSD) for intracranial pressure (ICP) monitoring in cases of traumatic head injury with hemorrhage. In a retrospective study, computed tomography (CT) data of 312 adult patients were collected and analyzed. ONSDs were measured at 3 mm and 8-10 mm distance from the globe together with the eyeball transverse diameter (ETD). The ONSD/ETD ratio was calculated. The correlation analysis was performed with gender, age, Glasgow Coma Scale score, and Glasgow Outcome Score. ONSD was enlarged in all cases when CT scans indicated hematoma. Enlarged right/left ONSDs were 6.5 ± 1.5/6.4 ± 1.3 mm at 3 mm and 6.6 ± 0.8/6.6 ± 0.6 mm at 8-10 mm from the globe (cut-off value > 5.5 mm). ONSD/ETD ratio was 0.29 ± 0.05, compared with 0.19 ± 0.02 in healthy adults (p < 0.01). We did not find a correlation between ONSD/ETD ratio and initial Glasgow Coma Scale score, but there was an inverse correlation between ONSD/ETD ratio and Glasgow Outcome Score (r = -0.83). We conclude that in cases with a traumatic head injury with hemorrhage, the ONSD is significantly enlarged, indicating elevated ICP. In ICP assessment, the most accurate results can be obtained if the ONSD is measured 8-10 mm from the globe and the ONSD/ETD ratio is calculated.
authors.affiliation: 1 Department of Otolaryngology-Head and Neck Surgery, Assaf Harofe Medical Center, Affiliated to Sackler Faculty of Medicine, Tel Aviv University , Israel .
authors.forename: Michael
authors.initials: M
authors.lastname: Vaiman
authors.affiliation: 2 Department of Radiology, Assaf Harofe Medical Center, Affiliated to Sackler Faculty of Medicine, Tel Aviv University , Israel .
authors.forename: Tal
authors.initials: T
authors.lastname: Sigal
authors.affiliation: 3 Neurology Department, Assaf Harofe Medical Center, Affiliated to Sackler Faculty of Medicine, Tel Aviv University , Israel .
authors.forename: Itzhak
authors.initials: I
authors.lastname: Kimiagar
authors.affiliation: 2 Department of Radiology, Assaf Harofe Medical Center, Affiliated to Sackler Faculty of Medicine, Tel Aviv University , Israel .
authors.forename: Inessa
authors.initials: I
authors.lastname: Bekerman
mesh_terms: D000328:Adult; D000070642:Brain Injuries, Traumatic / Q000000981:diagnostic imaging* / Q000453:epidemiology / Q000503:physiopathology; D002543:Cerebral Hemorrhage / Q000000981:diagnostic imaging* / Q000453:epidemiology / Q000503:physiopathology; D005260:Female; D006801:Humans; D007427:Intracranial Pressure / Q000502:physiology*; D008297:Male; D009900:Optic Nerve / Q000000981:diagnostic imaging* / Q000502:physiology*; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000379:methods; D055815:Young Adult
keywords: CT scan; hematoma; intracranial pressure; optic nerve sheath diameter; traumatic head injury