Stroke, Vol 24, 1347-1351, Copyright © 1993 by American Heart Association
F Mounier-Vehier, D Leys, P Rondepierre, O Godefroy and JP Pruvo
BACKGROUND AND PURPOSE: Possible specific risk factors for silent infarcts
remain unknown. The aim of this study was to investigate whether risk
factors for silent infarcts differ from those for symptomatic infarcts in
stroke patients. METHODS: Silent infarcts were defined as asymptomatic
infarcts detected on computed tomographic scan in patients free of history
of stroke and unrelated to the symptoms and signs of the index stroke. Of
595 consecutive patients with stroke or transient ischemic attacks, 116
(19%) had at least one silent infarct on the first computed tomographic
scan performed within 24 hours after onset. They were compared with the 479
remaining patients for cerebrovascular risk factors and for presumed
mechanism of stroke by means of the odds ratio method. A discriminant
analysis was then performed in the subgroup of 216 patients with ischemic
stroke who underwent an exhaustive cardiac and vascular workup. RESULTS:
One hundred forty-one silent infarcts (99% confidence interval [CI], 29% to
41%) and 265 symptomatic infarcts (99% CI, 59% to 71%) were subcortical
infarcts smaller than 15 mm. Univariate analysis showed that patients with
silent infarcts were more likely to be older than 65 years (odds ratio [99%
CI], 1.11 to 3.49) and to have left atrial enlargement on echocardiogram
(odds ratio [99% CI], 1.02 to 26.70) and leukoaraiosis (odds ratio [99%
CI], 1.39 to 4.21). Discriminant analysis found only two independent risk
factors for silent infarcts: left atrial enlargement (P = .007) and age
older than 65 years (P = .03); leukoaraiosis was not found to be an
independent risk factor (P = .86). CONCLUSIONS: Age and left atrial
enlargement are the main risk factors for silent infarcts in patients with
ischemic stroke or transient ischemic attacks.
ARTICLES
Silent infarcts in patients with ischemic stroke are related to age and size of the left atrium
Department of Neurology, University Hospital, Lille, France.
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