Microembolic Signals and Diffusion-weighted MR Imaging Abnormalities in Acute Ischemic Stroke
Kazumi Kimuraa,
Kazuo Minematsua,
Masatoshi Kogaa,
Ryuki Arakawaa,
Masahiro Yasakaa,
Hiroshi Yamagamia,
Kazuyuki Nagatsukaa,
Hiroaki Naritomia and
Takenori Yamaguchia
a From the Cerebrovascular Division, Department of Medicine, National Cardiovascular Center, 5–7–1 Fujishirodai, Suita, Osaka 565–8565, Japan. Address reprint requests to Masahiro Yasaka, MD.
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FIG 1. Patient 2.
A and B, Axial diffusion-weighted images 7 days after stroke onset show five spotty hyperintense lesions in the right hemisphere (arrows). Four MESs were recorded for 30 minutes from the right MCA. This patient had 90% stenosis at the origin of the right ICA.
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FIG 2. Patient 6.
A–D, Axial diffusion-weighted images 5 days after stroke onset show several spotty hyperintense abnormalities (arrows) in both hemispheres. Thirty-eight and thirty-three MESs were recorded with TCD for 30 minutes from the right and left MCAs, respectively. This patient had neither arterial nor cardiac disease but had complicated lesions in the aorta.
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FIG 3. Small lesions on DWI are more frequent in the MES group than in the control group (P < .004). However, the frequency of medium and large lesions does not differ between the two groups
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