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[Abnormalities on diffusion-weighted magnetic resonance imaging in patients with transient ischemic attack]
Tomomi Nakamura1, Shinichiro Uchiyama, Yasuro Shibagaki
1Department of Neurology, Ushiku Aiwa General Hospital.
Rinsho Shinkeigaku = Clinical Neurology
|June 25, 2003
Summary
Diffusion-weighted imaging (DWI) detects focal abnormalities in transient ischemic attack (TIA) patients, especially those with atrial fibrillation (Af). DWI is more sensitive than other MRI sequences for identifying ischemic lesions.
Area of Science:
- Neurology
- Radiology
- Cardiology
Context:
- Transient ischemic attack (TIA) is a critical warning sign for stroke.
- Diffusion-weighted imaging (DWI) is a sensitive MRI technique for detecting acute ischemic lesions.
- Atrial fibrillation (Af) is a known risk factor for cardioembolic stroke.
Purpose:
- To evaluate the utility of DWI in identifying acute ischemic lesions in TIA patients.
- To investigate the association between atrial fibrillation and DWI abnormalities in TIA patients.
- To compare the sensitivity of DWI with other MRI sequences (T2-weighted, FLAIR) in TIA.
Summary:
- Out of 18 TIA patients, 9 showed focal abnormalities on DWI.
- All 6 TIA patients with atrial fibrillation (Af) had DWI abnormalities.
- TIA patients with Af had significantly more DWI abnormalities than those without Af (p=0.009).
- DWI demonstrated higher sensitivity in detecting ischemic lesions compared to T2-weighted or FLAIR imaging.
Impact:
- These findings suggest that DWI is a valuable tool for diagnosing TIA and identifying potential embolic sources.
- The high prevalence of DWI abnormalities in TIA patients with Af underscores the importance of cardiac evaluation in TIA workup.
- DWI may help differentiate embolic TIA from other causes, guiding treatment strategies.