Evolution of lesion volume in acute stroke treated by intravenous t-PA

J Magn Reson Imaging. 2005 Jul;22(1):23-8. doi: 10.1002/jmri.20363.

Abstract

Purpose: To determine the evolution of the ischemic lesion volumes in a population treated with tissue plasminogen activator (t-PA), MRIs were performed before treatment and 24 hours later; final infarct size was evaluated 60 days later.

Materials and methods: A total of 42 patients with hemispheric stroke were recruited for a thrombolytic study. Intravenous t-PA was given after MRI within the first seven hours after stroke onset. Volumes were evaluated on day 0 and day 1 with diffusion-weighted imaging (DWI), on day 60 with T2-weighted imaging (T2WI), and recanalization was assessed based on day 1 MR angiography (MRA).

Results: Lesion volume increased between day 0 and day 1, and decreased between day 1 and day 60. It was lower in the group of patients with recanalization on day 1 MRA.

Conclusion: Volume analysis emphasizes the effectiveness of recanalization as a predictive factor for better outcome, based on final infarct size. The decrease in lesion volumes between day 1 and day 60 suggests that other factors leads to overestimation of day 1 abnormal diffusion volume. This could explain the delayed partial reversibility of the DWI abnormality.

MeSH terms

  • Brain / pathology
  • Diffusion Magnetic Resonance Imaging*
  • Humans
  • Reproducibility of Results
  • Stroke / drug therapy*
  • Stroke / pathology*
  • Tissue Plasminogen Activator / therapeutic use*

Substances

  • Tissue Plasminogen Activator