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Developing an Asymmetry Method for Detecting Postictal Hyperperfusion in Poststroke Epilepsy.

Kazuki Fukuma1, Tomotaka Tanaka1, Shigetoshi Takaya2,3

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

Frontiers in Neurology
|August 1, 2022
PubMed
Summary

A new asymmetry method using a single SPECT scan effectively detects prolonged hyperperfusion in poststroke epilepsy (PSE). This approach shows high accuracy and concordance with clinical findings, offering a valuable diagnostic tool for PSE.

Keywords:
asymmetryepilepsyhyperperfusionpoststroke epilepsysingle photon emission computed tomography (SPECT)stroke

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Area of Science:

  • Neurology
  • Radiology
  • Epilepsy Research

Background:

  • Poststroke epilepsy (PSE) diagnosis can be challenging.
  • Dual SPECT scans (postictal-interictal subtraction) detect hyperperfusion but require two scans.
  • A single-scan method for detecting hyperperfusion in PSE is needed.

Purpose of the Study:

  • To evaluate a novel asymmetry method for localizing hyperperfusion in PSE using a single postictal SPECT scan.
  • To compare the asymmetry method's performance against the established postictal-interictal (P-I) subtraction method.
  • To assess the asymmetry method's diagnostic accuracy and lateralization concordance.

Main Methods:

  • Sixty-four patients with PSE underwent two perfusion SPECT scans (postictal and interictal).
  • A novel asymmetry method was developed, involving subtraction analysis of SPECT scans co-registered to MRI.
  • Sensitivity, specificity, and lateralization concordance were calculated against the P-I subtraction method and clinical findings.

Main Results:

  • The asymmetry method detected prolonged postictal hyperperfusion in 67% of patients, compared to 84% with the P-I method.
  • The asymmetry method demonstrated high sensitivity (80%) and specificity (100%).
  • High lateralization concordance was observed with seizure semiology (97%) and EEG findings (100%).

Conclusions:

  • The objective asymmetry method is advantageous for detecting prolonged hyperperfusion in PSE.
  • This single-scan SPECT approach offers a valuable auxiliary diagnostic tool for poststroke epilepsy.
  • The method shows high accuracy and clinical relevance for localizing epileptic activity in PSE.