Risk factors outperform intracranial large artery stenosis predicting unfavorable outcomes in patients with stroke

BackgroundThis study examined how intracranial large artery stenosis (ILAS), symptomatic and asymptomatic ILAS, and risk factors affect unfavorable outcome events after medical treatment in routine clinical practice.MethodsThis was a 24-month prospective observational study of consecutively recruited stroke patients. All participants underwent magnetic resonance angiography, and their clinical characteristics were assessed. Outcome events were vascular outcome, recurrent stroke, and death. Cox regression analyses were performed to identify potential factors associated with an unfavorable outcome, which included demographic and clinical characteristics, the risk factors, and stenosis status.ResultsThe analysis included 686 patients; among them, 371 were assessed as ILAS negative, 231 as symptomatic ILAS, and 84 as asymptomatic ILAS. Body mass index (p<.05), hypertension (p=.01), and old infarction (p=.047) were factors relating to vascular outcomes. Hypertension was the only factor for recurrent stroke (p=.035). Poor glomerular filtration rate (<30mL/min/1.73m(2)) (p=.011) and baseline National Institutes of Health Stroke Scale scores (p<.001) were significant predictors of death.ConclusionsThis study extended previous results from clinical trials to a community-based cohort study by concurrently looking at the presence/absence of stenosis and a symptomatic/asymptomatic stenotic artery. Substantiated risk factors rather than the stenosis status were predominant determinants of adverse outcome. Although the degree of stenosis is often an indicator for treatment, we suggest risk factors, such as hypertension and renal dysfunction, should be monitored and intensively treated.