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Assessment of transient ischemic attack with diffusion- and perfusion-weighted imaging
Lucas Restrepo1, Michael A Jacobs, Peter B Barker
1Department of Neurology, Johns Hopkins Hospital, 600 N. Wolfe Street, Baltimore, MD 21287, USA.
AJNR. American Journal of Neuroradiology
|December 1, 2004
Summary
Diagnosing transient ischemic attack (TIA) is challenging. Combining diffusion-weighted (DW) and perfusion-weighted (PW) MR imaging identified brain ischemia in most TIA patients, aiding diagnosis.
Area of Science:
- Neurology
- Radiology
- Neuroimaging
Background:
- Transient ischemic attack (TIA) diagnosis is difficult due to lack of evidence on conventional imaging.
- Optimal diagnostic methods are crucial, as acute brain infarction on imaging may indicate stroke, not TIA.
- Perfusion-weighted (PW) MR imaging was hypothesized to aid TIA diagnosis.
Observation:
- A retrospective analysis included 22 patients with transient neurologic symptoms (<24 hours).
- Patients underwent diffusion-weighted (DW) and PW imaging.
- MR imaging revealed abnormalities in 68% of patients.
Findings:
- 12 patients had abnormal DW imaging.
- 4 patients showed both DW and PW imaging defects (mismatch).
- 3 patients had isolated PW imaging abnormalities. No differences in symptoms, etiology, or risk factors were found between groups.
Implications:
- Combined DW and PW imaging detected brain ischemia in most clinically diagnosed TIA patients.
- Mismatch findings correlated with increased need for angiography or cerebrovascular procedures.
- Further prospective studies are needed to confirm tissue outcomes and clinical significance of DW-PW imaging abnormalities.