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Perfusion CT significantly enhances acute ischemic stroke detection compared to noncontrast CT. It accurately predicts final infarcts, aiding in timely diagnosis and treatment decisions for stroke patients.

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Area of Science:

  • Neurology
  • Radiology
  • Medical Imaging

Background:

  • Noncontrast CT (NCCT) has limitations in diagnosing acute ischemic stroke.
  • Perfusion CT (CTP) offers potential improvements in diagnostic accuracy.

Purpose of the Study:

  • To identify predictors of focal hypoperfusion in acute ischemic stroke.
  • To evaluate the performance of CTP in predicting final infarcts on follow-up imaging.

Main Methods:

  • Retrospective analysis of 2216 patients with acute ischemic stroke and CTP from the Lausanne Stroke Registry.
  • Multivariate analyses to identify predictors of focal hypoperfusion.
  • Assessment of CTP's sensitivity, specificity, and predictive values for infarct detection.

Main Results:

  • 38.2% of patients showed acute ischemic lesions on NCCT, while 73.3% had focal hypoperfusion on CTP.
  • Clinical factors (NIHSS, visual field defect, aphasia, hemineglect, sensory deficits, impaired consciousness) and radiologic findings (early ischemic changes, anterior circulation, arterial occlusion) predicted hypoperfusion.
  • CTP demonstrated 66.5% sensitivity and 79.4% specificity for infarct detection, with 76.8% overall accuracy.

Conclusions:

  • CTP doubles the sensitivity for detecting acute ischemic stroke compared to NCCT.
  • Focal hypoperfusion is linked to stroke severity, cortical deficits, nonlacunar supratentorial strokes, and shorter imaging delays.
  • CTP and MR imaging are complementary for acute ischemic stroke assessment.