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Visualizing prolonged hyperperfusion in post-stroke epilepsy using postictal subtraction SPECT.

Kazuki Fukuma1, Katsufumi Kajimoto1, Tomotaka Tanaka1

  • 1Department of Neurology, National Cerebral and Cardiovascular Center, Osaka, Japan.

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
|February 18, 2020
PubMed
Summary

Post-stroke epilepsy diagnosis is improved with postictal single-photon emission computed tomography (SPECT). This imaging technique visualizes epileptic activity, complementing electroencephalography (EEG) for better localization.

Keywords:
Hyperperfusionperfusion imagingpost-stroke epilepsypost-stroke seizuressingle-photon emission computed tomography

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Area of Science:

  • Neurology
  • Nuclear Medicine
  • Epilepsy Research

Background:

  • Diagnosing post-stroke epilepsy is difficult due to low electroencephalography (EEG) abnormality rates.
  • Identifying epileptic activity in stroke survivors requires advanced imaging techniques.

Purpose of the Study:

  • To evaluate the utility of postictal subtraction single-photon emission computed tomography (SPECT) in visualizing epileptic activity.
  • To assess SPECT as a diagnostic tool for post-stroke epilepsy.

Main Methods:

  • Fifty patients with post-stroke epilepsy underwent Tc-99m-ECD SPECT (postictal and interictal).
  • Subtraction (postictal-interictal) SPECT identified hyperperfusion areas, classified as superficial or deep-seated.
  • Laterality and distribution of hyperperfusion were compared with stroke lesions, seizure symptoms, and EEG findings.

Main Results:

  • 86% of patients showed hyperperfusion on subtraction SPECT.
  • Subtraction SPECT revealed prolonged postictal hyperperfusion, even with long intervals between seizure and imaging.
  • Hyperperfusion laterality strongly correlated with stroke lesion laterality (97.7%), seizure symptoms (91.9%), and EEG findings (100%).

Conclusions:

  • Postictal SPECT is a valuable tool for diagnosing and localizing post-stroke epilepsy.
  • SPECT findings complement scalp EEG, particularly for deep-seated epileptic activity.
  • This imaging modality enhances diagnostic accuracy in challenging epilepsy cases.