Reply to: Ocular ultrasonography to detect intracranial pressure in aneurysmal subarachnoid hemorrhage

In Reply

We would like to thank De Bernardo et al. for their concern and thoughtful suggestions to our article.^{1, 2} We agree that ultrasound measurement of optic nerve sheath diameter (ONSD) for the evaluation of intracranial pressure (ICP) was mentioned earlier. However, those two studies used A-scan ultrasonography.^{3, 4} As an increased number of studies, such as Reviews, Original researches, and Meta-Analyses, have used B-ultrasound as a noninvasive and useful method to analyze the relationship between ICP and ONSD,^5-9 we also choose the B-ultrasound in our study, which was commonly used modality. Therefore, in the Introduction section, we have also cited a study mentioned that B-scan which reported that ONSD would dilate in patients with increased ICP in 1989.¹⁰ We agree with the views of the De Bernardo that A-scan technique has also certain advantages, which deserves our attention with this modality in the future research. Besides, thank you very much for supplying the methods to identify optic nerve inflammation or compartment syndrome.

Conflict of Interest

The authors declare they have no conflict of interest.