Non cardioembolic Mechanisms in Cryptoge

Original Articles

Journal of Clinical Neurology / Volume 1 / April, 2005

Non-cardioembolic Mechanisms in Cryptogenic Stroke:
Clinical and Diffusion-weighted Imaging Features
Oh Young Bang, M.D., Ph.D., Phil Hyu Lee, M.D., Ph.D., Seung Hyeon Yeo, M.D.,
Ji Won Kim, M.D., In Soo Joo, M.D., Kyoon Huh, M.D.
Department of Neurology, Ajou University School of Medicine, Suwon, Korea

Background: The role of several cardiogenic risk factors, including patent foramen ovale, in patients with
cryptogenic stroke has been extensively studied. However, little attention has been paid to the role of
non-cardioembolic causes of cryptogenic stroke. We therefore sought to identify the characteristics of cryptogenic
stroke.
Methods: We studied 832 patients with acute infarction in the middle cerebral arterial territory. We divided the
patients into four subtypes: 402 with large artery atherosclerosis (LAA), 133 with cardioembolism, 182 with small
arterial occlusion (SAO), and 115 with cryptogenic stroke. We compared risk factors and lesion patterns observed
by diffusion-weighted imaging (DWI) between patients with cryptogenic stroke and those with stroke of other
subtypes.
Results: Both risk factors and DWI lesion patterns differed between the cryptogenic and cardioembolic groups
(P10 mg/dl were

excluded because of possible coexistent infection
(N=29).

the patient, initial stroke severity, or stroke risk factors.
Those that were significant at the 0.2 level were entered
into the initial multivariate model. When the most
parsimonious model was obtained by backward stepwise
elimination of the non-significant factors, each of the
excluded variables was again entered separately into the
model to test its contribution to the final model. Results
are given as OR estimates of relative risk, with 95% CI.
Statistical significance was established at the P

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