Optic Nerve Sheath Diameter / Eyeball Transverse Diameter Ratio and Prognosis of Sepsis Associated Encephalopathy

"Ocular ultrasonography will be performed once daily on patients diagnosed with sepsis associated encephalopathy at the bedside by two experienced examiners, who will be blinded to patients' clinical data, following the CLOSED protocol for ONSD sonography.~ONSD will be measured at 3 mm behind the merging point of the nerve from the papilla optic disc. The maximum external diameter of ONSD will be measured in the transverse plane perpendicular to the optic nerve and the maximum diameter of ETD (parallel lens) on this plane will be measured.~Two measurements will be taken for each eye; horizontal and vertical. The sequence for measurements will be left eye horizontal; left eye vertical; right eye horizontal; right eye vertical.~The ONSD measurements in the transversal and the sagittal plane for each eye measured by the two examiners will be averaged. Then, ETDs measurements will be averaged to obtain averaged ONSD/ETD ratio as a data to record the mean values of ONSD/ETD ratio."