BioMed Central

New marker for raised intracranial pressure

Published in Health Risk Factor Week, September 23rd, 2008

Magnetic resonance imaging (MRI) measurements of the thickness of the optic nerve sheath are a good marker for raised intracranial pressure (ICP). New research published in BioMed Central's open access journal Critical Care shows that a retro-bulbar optic nerve sheath diameter (ONSD) above 5.82mm predicts raised ICP in 90% of cases.

The dural sheath surrounding the optic nerve communicates with the subarachnoid space and distends when ICP is elevated. Thomas Geeraerts, from Addenbrooke's Hospital, Cambridge, led a team who investigated whether MRI can be used to precisely measure the diameter of the optic nerve and its sheath. He said, "Raised ICP is frequent in...

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Source: Health Risk Factor Week (2008-09-23)

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