Optic nerve sheath diameters in nontraumatic brain injury: A scoping review and role in the intensive care unit

Table 1 Basic characteristics of the studies on optic nerve sheath diameter in patients with non-traumatic increased intracranial pressure, n (%)

Study characteristic	Number of studies, n = 37
Year of publication
2013	1 (2.7)
2014	3 (8.1)
2015	5 (13.5)
2016	3 (8.1)
2017	4 (10.8)
2018	2 (5.4)
2019	4 (10.8)
2020	1 (2.7)
2021	3 (8.1)
2022	2 (5.4)
2023	7 (18.9)
2024	2 (5.4)
Country of origin
China	8 (21.6)
India	7 (18.9)
Turkey	5 (13.5)
South Korea	3 (8.1)
Iran	2 (5.4)
Brazil	2 (5.4)
Italy	2 (5.4)
United States	2 (5.4)
Uganda	1 (2.7)
Spain	1 (2.7)
Saudi Arabia	1 (2.7)
Greece	1 (2.7)
South Africa	1 (2.7)
Germany	1 (2.7)
Comparator parameter
Intraventricular ICP monitoring	3 (8.1)
CSF opening pressure for lumbar puncture	20 (54)
MRI/CT scans	14 (37.8)
Type of study
Prospective observational study	17 (45.9)
Prospective case control study	12 (32.4)
Prospective cohort study	4 (10.8)
Retrospective case study	2 (5.4)
Case reports	2 (5.4)

ICP: Intracranial pressure; CSF: Cerebro-spinal fluid; MRI: Magnetic resonance imaging; CT: Computed tomography.