Can bedside sonographic measurement of optic nerve sheath diameter in the emergency department identify increased intracranial pressure?

BEEM Bottom Line

Why is this study important?

The idea of sonographic measurement for the diagnosis of increased increased intracranial pressure (ICP) is not new but nor has it been unequivocally demonstrated as a valid and reliable diagnostic tool.[1] This study further examines the role of sonographic measurement of the ONSD as a noninvasive method, without ionizing radiation, for detecting raised ICP.

Which, if any, threats to validity are most likely to have an impact on the results and how?

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