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شعاع غلاف عصب اپتیک
The elevated ICP is transmitted to the subarachnoid space surrounding the optic nerve, causing optic nerve sheath diameter (ONSD) expansion [17].
The total ONSD is measured 3 mm behind the posterior globe along an axis perpendicular to the optic nerve and sheath (Fig. 4).
In 2011, a meta-analysis of 231 patients with TBI and six studies with ONSD thresholds ranging from
Other investigators found a significant increase in the ONSD in ICP patients compared with
Using a cut-off ONSD value of 5.8 mm, they found a sensitivity of 90% in the detection of increased ICP (defined by opening pressure of >20 cm of H2O on lumbar punctures) and a specificity of 84% [19].
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