Study of Symptomatic vs. Silent Brain Infarctions on MRI in Elderly Subjects

Sheelakumari Raghavan, Jonathan Graff-Radford, Eugene Scharf, Scott A. Przybelski, Timothy G. Lesnick, Brian Gregg, Christopher G. Schwarz, Jeffrey L. Gunter, Samantha M. Zuk, Alejandro Rabinstein, Michelle M. Mielke, Ronald C. Petersen, David S. Knopman, Kejal Kantarci, Clifford R. Jack, Prashanthi Vemuri

Research output: Contribution to journalArticlepeer-review

Abstract

Brain infarctions are closely associated with future risk of stroke and dementia. Our goal was to report (i) frequency and characteristics that differentiate symptomatic vs. silent brain infarctions (SBI) on MRI and (ii) frequency and location by vascular distribution (location of stroke by major vascular territories) in a population based sample. From Mayo Clinic Study of Aging, 347 participants (≥50 years) with infarcts detected on their first MRI were included. Infarct information was identified visually on a FLAIR MRI image and a vascular territory atlas was registered to the FLAIR image data in order to identify the arterial territory of infarction. We identified the subset with a clinical history of stroke based on medical chart review and used a logistic regression to evaluate the risk factors associated with greater probability of a symptomatic stroke vs. SBI. We found that 14% of all individuals with infarctions had a history of symptomatic stroke (Silent: n = 300, symptomatic: n = 47). Factors associated with a symptomatic vs. SBI were size which had an odds ratio of 3.07 (p < 0.001), greater frequency of hypertension (odds ratio of 4.12, p = 0.025) and alcohol history (odds ratio of 4.58, p = 0.012). The frequency of infarcts was greater in right hemisphere compared to the left for SBI. This was primarily driven by middle cerebral artery (MCA) infarcts (right = 60%, left = 40%, p = 0.005). While left hemisphere strokes are more common for symptomatic carotid disease and in clinical trials, right hemispheric infarcts may be more frequent in the SBI group.

Original languageEnglish (US)
Article number615024
JournalFrontiers in Neurology
Volume12
DOIs
StatePublished - Feb 17 2021

Keywords

  • clinical stroke
  • laterality
  • middle cerebral artery
  • silent brain infarction
  • vascular distribution

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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