In this study the invistigators chose to measure the optic nerve sheath diameter by sonography for diagnosis of elevated intracranial pressure (ICP) in comparison to brain computed tomograhy (CT) as the reference gold standard for detection of raised ICP since optic nerve songraphy is radiation-free , noninvasive, and has certain features which increase its convenience portability, easy application, low cost, repeatability on request, bedside application, short application time and applicability even in the presence of unstable vital signs.
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To measure the optic nerve sheath diameter by optic nerve ultrasound in patients with elevated ICP before and after osmotherapy and to measure the accuracy of occular ultrasound in diagnosis of elevated ICP compared to cranial computed tomography (CT)
Timeframe: up to 48 hours