Abstract
Objective: This study aimed to detect whether optic nerve sheath diameter (ONSD) can be used to dynamically monitor intracranial pressure (ICP). Methods: Adult patients being monitored for invasive ICP on day one after hospital admission were included. For each patient, ONSD was first measured in the supine position, then at the 30° head-up position. The dynamic test was conducted in 16 patients. The ONSD was measured in the supine position once a day for three continuous days (day one to day three after admission).Results: The ONSD and ICP values obtained in the supine position on admission were strongly correlated (r of 0.799). When patients changed their position from supine to the 30° head-up position, the ICP and ONSD values decreased correspondingly. However, the change in ICP did not correlate well with the change in ONSD (r of 0.358). In the dynamic test, a good agreement between ICP and ONSD only existed in three (18.75%) patients. In addition, three patients had completely different profiles for ICP and ONSD.Conclusions: The results suggest that the changes in ONSD and ICP values were not correlated well after dynamic observation. Measurement of ONSD may not be a suitable tool to dynamically monitor ICP.
Optic nerve sheath diameter with intracranial pressure monitoring: a non-invasive method to follow children with craniosynostosis
