Correlation Between Optic Nerve Sheath Diameter and Intracranial Pressure Based on Ultrasonography

Abstract

Objective: This paper measures whether there is any difference between the non-invasive monitoring technology that shows the change in ICP value and the current "gold standard" intraventricular probe-type intracranial pressure monitoring technology. Methods: 61 critically ill patients with traumatic brain injury requiring invasive ICP monitoring in the intensive care unit of our hospital from April 2017 to September 2017 were selected. The study subjects were selected in strict accordance with the inclusion and exclusion criteria of experimental design. Each patient recorded the ICP values before and after intravenous drip of 20% mannitol 125 ml, and received ultrasound measurements at bedside by two different physicians before, after, 10 minutes, and 30 minutes after ICP changes. Results: The consistency of the ONSD values measured by different doctors at the same time was the same, and the repeatability of the bedside ultrasound measurement of the ONSD values was better. There was no significant difference between the ONSD value measured immediately after the ICP drop and the ONSD value before the ICP drop. There was a significant difference between the ONSD value measured 10 minutes after the ICP drop and the ONSD value before the ICP drop. However, there was no significant difference in the value of ONSD measured between 10 minutes and 30 minutes after the ICP decreased. Conclusion: ONSD reflects that the lag time window of ICP changes is within 10 minutes, but the measured values of ONSD within the 20-minute period from 10 minutes to 30 minutes after ICP changes can better reflect the current ICP values.