Table 5.

Imaging

Author	Aim of study	Country	Methodology	Sample size	Period	Outcome measures	Summary of findings
Fotakopoulos 2018	To evaluate the diagnostic performance of different diagnostic CT scan perfusion aspects in diagnosing the clinical outcome of patients with SAH	Greece	Prospective case series	7	Jul– Sep 2016	• CBF	• CBF value of <24.5 presented 67% sensitivity and 100% specificity in diagnosis of adverse ischemic events at 1 month
Rubino 2014	To determine how often routine head CT at clinic follow-up yields clinically useful information	Lebanon	Retrospective cohort	173	Apr 2006 – Aug 2012	• Clinically relevant CT finding	• Symptomatic at follow-up and having a change in CT scan: sensitivity, 66.7%; specificity, 61.6%,
Wu 2010	To compare CT and SWI in their abilities to detect SAH and determine whether SWI can provide complementary information to CT.	China	Diagnostic and test accuracy	20	May 2008 – Dec 2008	• Radiologic identification of SAH on CT and SWI	• SWI was found to perform better than CT in detecting intraventricular hemorrhage, but worse when detecting basilar cistern SAH

CT, computed tomography; SAH, subarachnoid hemorrhage; CBF, cerebral blood flow; SWI, susceptibility weighted imaging;.