Optic nerve sheath diameter (ONSD) ultrasound can be undertaken with excellent inter- and intra-rater reliability and has a low risk of inter-rater bias.
Why this matters
Measurement of intracranial pressure (ICP) is an invasive procedure with concomitant bleeding risks, thus non-invasive methods are needed to detect patients at risk of elevated ICP.
ONSD has shown high sensitivity and specificity in previous studies, but its clinical applicability is uncertain due to no specified cutoff values. This study, the first of its kind, provides support that ONSD presents a non-invasive option for ICP measurement that can be widely implemented.