Location, size, and risk factors of incident covert brain infarcts in patients with acute non-cardioembolic ischemic stroke: PACIFIC-STROKE trial.
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INTRODUCTION: Covert brain infarcts (CBIs) identified by imaging are more frequent than symptomatic ischemic strokes and are usually small and/or involve non-eloquent brain areas. The spectrum of incident CBIs in patients following acute ischemic stroke has not been well characterized. PATIENTS AND METHODS: Exploratory observational cohort study of the size, location, multiplicity and risk factors of incident CBIs identified using serial MRIs in patients with acute non-cardioembolic ischemic stroke participating in the PACIFIC-STROKE trial. RESULTS: Incident CBIs were identified in 16% (220/1358) of participants during the mean 5.6-month interval between MRIs. Single incident CBIs occurred in 150 (68%) of incident CBI patients and multiple CBIs in 70 (32%); 42% (93/220) of incident CBI patients had a single, small, subcortical CBI. There was no clear relationship between the location of incident CBI and the location of index stroke. Significant independent features associated with incident CBI included diabetes (adjusted OR 1.52, 95%CI 1.09-2.12), current tobacco use (adjusted OR 1.50, 95%CI 1.07-2.09), prior stroke/TIA (adjusted OR 1.59, 95%CI 1.08-2.36), carotid artery atherosclerosis (adjusted OR 1.47, 95%CI 1.07-2.02), and diastolic blood pressure (adjusted OR 1.02 per 1 mmHg increase, 95%CI 1.01-1.04). DISCUSSION AND CONCLUSION: Incident CBIs in patients following acute non-cardioembolic stroke were frequent, usually small and subcortical, and associated with traditional stroke risk factors. Observations from PACIFIC-STROKE, particularly the absence of correlation between the location of incident CBI and the index infarct and the high frequency of incident small, subcortical CBIs, suggest that incident CBI pathogenesis is complex and heterogeneous in this population. TRIAL REGISTRATION: https://clinicaltrials.gov (NCT04304508).
