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Use of the sonographic diameter of optic nerve sheath to estimate intracranial pressure.
MedLine Citation:
PMID:  22944553     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND AND AIMS: An increase in the intracranial pressure (ICP) might aggravate patient outcomes by inducing neurologic injuries. In patients with increased ICP the optic nerve sheath diameter (ONSD) increases due to its close association with the flow of cerebrospinal fluid. The present study was an attempt to evaluate the efficacy of sonographic ONSD in estimating ICP of patients who are candidates for lumbar puncture (LP). MATERIALS AND METHODS: In this descriptive prospective study, the ONSD was measured before LP using an ultrasonography in 50 nontraumatized patients who were candidates for LP due to varies diagnoses. Immediately after the sonography, the ICP of each patient was measured by LP. Correlation tests were used to evaluate the relationship between ICP and the sonographic diameter of the optic nerve sheath. Receiver operating characteristic curve was used to find the optimal cut-off point in order to diagnose ICP values higher than 20 cm H(2)O. RESULTS: The means of the ONSD were 5.17 ± 1.01 and 5.19 ± 1.06 mm on the left and right sides, respectively (P = .552). The mean ONSD for the patients with increased ICP and normal individuals were 6.66 ± 0.58 and 4.60 ± 0.41 mm, respectively (P < .001). This mean was significantly correlated with ICP values (P < .05; r = 0.88). The ONSD of greater than 5.5 mm predicted an ICP of ≥20 cm H(2)O with sensitivity and specificity of 100% (95% CI, 100-100) (P < .001). CONCLUSION: The sonographic diameter of the optic nerve sheath might be considered a strong and accurate predicting factor for increased intracranial pressure.
Authors:
Afshin Amini; Hamid Kariman; Ali Arhami Dolatabadi; Hamid Reza Hatamabadi; Hojjat Derakhshanfar; Behnam Mansouri; Saeed Safari; Razie Eqtesadi
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-31
Journal Detail:
Title:  The American journal of emergency medicine     Volume:  -     ISSN:  1532-8171     ISO Abbreviation:  Am J Emerg Med     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-9-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8309942     Medline TA:  Am J Emerg Med     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier Inc.
Affiliation:
Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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