Ocular ultrasound for raised Intracranial Pressure

Ocular ultrasound is a rapid non-invasive tool for assessment of raised Intracranial pressure.
A cut off value of 0.5cms has a high sensitivity and specificity for detecting raised ICP greater than 20cms H2O

[@pvermehren]

On the left eye you measured the optic nerve instead of the surrounding optic nerve sheath - the optic nerve of course does not change its Diameter with rising ICP, but the optic nerve sheath which is filled with CSF expands as ICP rises, and therefore correlates with increased ICP. It is the more hyperechoic structure adjacent to/ surrounding the hypoechoic optic nerve itself. In the image of the left eye this is easy to identify, in the right eye it is more difficult due to the image quality.
And a cut-off of > 5 mm ist not predictive of raised ICP as there is great interindividual variation in optic nerve sheath diameter. More realistic is that 6mm likely elevated ICP, between 5-6mm is unclear.

[@theanalysis4665]

Thank you.

[@gyrus7744]

Tnx, great value!

[@32ahmmed]

Thx