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Bedside emergency department ocular ultrasound is increasingly used to detect retinal detachment, but does it also have other uses? Researchers performed a meta-analysis of six prospective studies (231 patients) in which researchers compared intracranial pressure (ICP) monitoring and ultrasound measurement of optic nerve sheath diameter (ONSD) in consecutive adult patients with suspected elevated ICP. ONSD was measured 3 mm behind the globe; ICP and ONSD measurements were performed within 1 hour of each other.
The pooled sensitivity for ONSD detection of elevated ICP was 90% and the pooled specificity was 85%. The pooled diagnostic odds ratio was 51, meaning that patients with elevated ICP were 51 times more likely to have a positive ONSD te…