Abstract Background Measurement of intracranial pressure (ICP) is crucial in the management of many neurological conditions. However, due to the invasiveness, high cost, and required expertise of available ICP monitoring techniques, many patients who could benefit from ICP monitoring do not receive it. As a result, there has been a substantial effort to explore and develop novel non-invasive ICP monitoring techniques to improve the overall clinical care of patients who may be suffering from ICP disorders. Objective Assessment of the role of ultrasound as a non-invasive method (bedside) to measure the raising of intracranial pressure by measuring the optic nerve sheath diameter in traumatic and nontraumatic neurocritical patients. Patients and Methods: A total of 100 patients of both sexes above 18 years old diagnosed with traumatic & non-traumatic brain injury with high intracranial pressure (ICP) which suspected by the initial CT brain and Marshall Classification were enrolled. Patients were divided into control group that included 50 patients with no evidence of any intracranial abnormality or severe head injury. Mean ONSD in the control group was considered to be normal. Study group subjects included 50 patients aged above 18 years old who sustained a severe traumatic or non-traumatic brain injury (GCS <8) All patients had a non-contrast CT head b efore any surgical or non-surgical i ntervention. The CT head was used to determine the Marshall score. Results Optic nerve sheath diameter was statistically significant higher in all periods 0-24 hours among cases with high intracranial tension compared with control ones with statistically significant positive correlations between it and age at 6hrs. and 24hrs and Marshal score at Ohr. and 24hrs and negative correlation between it and GCS score at Ohr. and 24hrs. The best cut off value for detector of raised intracranial pressure was 4.9 with sensitivity 94.7%, specificity 83.3%, positive predictive value 94.7% and negative predictive value 83.3%. Conclusion The evaluation of the optic nerve sheath diameter is a simple non-invasive procedure, which is a potentially useful tool in the assessment and monitoring of traumatic and nontraumatic neurocritical patients suspected of having raised intracranial pressure.
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