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Related Concept Videos

Brain Imaging01:14

Brain Imaging

Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans),  magnetic resonance imaging (MRI),  functional magnetic resonance imaging (fMRI), and Transcranial Magnetic Stimulation (TMS).
Transient Ischemic Attack l: Introduction01:26

Transient Ischemic Attack l: Introduction

A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...

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09:59

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Serial brain MRI in TIA patients.

Nicolas Carpentier1, Myriam Edjlali, Fatna Bouhafs

  • 1Inserm U894, Service d'Imagerie Morphologique et Fonctionnelle, Centre De Psychiatrie et Neurosciences, Centre Hospitalier Sainte-Anne, Université Paris-Descartes, 1 rue Cabanis, 75014 Paris, France.

Journal of Neuroradiology = Journal De Neuroradiologie
|June 30, 2012
PubMed
Summary

Transient ischemic attack (TIA) lesions on diffusion-weighted imaging (DWI) can change within days. Some TIA DWI lesions disappear quickly, while others appear later, highlighting the dynamic nature of these findings.

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Area of Science:

  • Neurology
  • Radiology
  • Neuroimaging

Background:

  • Diffusion-weighted imaging (DWI) detects ischemic lesions in up to 40% of transient ischemic attack (TIA) patients.
  • The temporal evolution of these DWI lesions after TIA onset is not fully understood.
  • Lesion visibility may vary, with some appearing early and others showing delayed detection or even reversibility.

Purpose of the Study:

  • To investigate the time course of ischemic lesions detected by DWI in TIA patients.
  • To determine the rate of reversible DWI lesions and delayed DWI positivity within the first week after TIA.
  • To compare early DWI findings with follow-up DWI scans in a cohort of TIA patients.

Main Methods:

  • Retrospective analysis of DWI scans from 64 TIA patients within 7 months.
  • Comparison of initial DWI (DWI(1), median 15 hours post-TIA) with follow-up DWI (DWI(2), median 47 hours post-TIA).
  • Two blinded readers assessed lesion characteristics, including number, extent, and arterial territory.

Main Results:

  • DWI(1) and DWI(2) showed consistent findings in 55 patients (86%).
  • In 14% of patients (n=9), changes were observed on DWI(2): 3 with new lesions, 3 with increased lesion size, and 3 with lesion reversibility.
  • These findings indicate dynamic changes in DWI lesion appearance and resolution post-TIA.

Conclusions:

  • Ischemic lesions on DWI are generally consistent between early and 48-hour follow-up scans in TIA patients.
  • A subset of TIA patients exhibits dynamic changes, including rapid lesion disappearance or delayed lesion detection on DWI.
  • Understanding the temporal profile of DWI lesions is crucial for accurate TIA diagnosis and management.