Prognostic Role of Optic Nerve Sheath Diameter for Neurological Outcomes in Post-Cardiac Arrest Patients: A Systematic Review and Meta-Analysis

Table 1

Characteristics of the included studies.

Author (year)	Publication year	Country	Design	Method of ONSD measurement	Time of ONSD measurement	Sample size	Cutoff (mm)	ONSD
								Poor prognosis	Good prognosis
Chae et al. [4]	2016	Korea	Retrospective	CT	Within 6 h after ROSC	119	5.9	5.8 (0.6)	5.6 (0.5)
Chelly et al. [5]	2016	France	Prospective	Ultrasound	At 24 h after CA	36	5.5	7.2 (6.8–7.4)	6.5 (6.0–6.8)
Ertl et al. [6]	2019	Germany	Prospective	Ultrasound	At 24 h after CA	49	5.75
Kim et al. [7]	2014	Korea	Retrospective	CT	Within 24 h after ROSC	91	6.21
Park et al. [8]	2019	Korea	Prospective	Ultrasound	At 24 h after ROSC	36	4.90
Ryu et al. [9]	2017	Korea	Retrospective	CT	Within 24 h after ECPR	42	6.69	6.07 (5.71–6.64)	5.57 (5.14–5.98)
Ueda et al. [10]	2015	Japan	Retrospective	Ultrasound	At 12–72 h after CA	17	5.4	6.1 (5.4–7.2)	5.0 (4.4–6.1)
You et al. [11]	2018	Korea	Retrospective	Ultrasound	Before TTM	83	5.11	5.29 (4.50–5.76)	4.48 (4.27–5.09)

CA: cardiac arrest; ECPR: extracorporeal cardiopulmonary resuscitation; NA: not available; ONSD: optic nerve sheath diameter; ROSC: return of spontaneous circulation; TTM: target temperature management.