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Wake-up strokes (WUS) are often missed for time-sensitive treatment. Identifying obstructive sleep apnea (OSA) and using advanced imaging can improve WUS patient outcomes.

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Area of Science:

  • Neurology
  • Sleep Medicine
  • Cardiovascular Research

Background:

  • Ischemic strokes frequently occur upon waking, termed wake-up strokes (WUS), with up to 30% occurring during sleep.
  • Obstructive sleep apnea (OSA) is a significant risk factor for WUS, exacerbating cardiovascular risks like hypertension and atrial fibrillation.
  • Circadian rhythm disruptions and other physiological changes also contribute to WUS predisposition.

Purpose of the Study:

  • To highlight the challenges in treating WUS due to uncertain onset times.
  • To emphasize the role of OSA as a critical risk factor and its impact on stroke outcomes.
  • To introduce advanced imaging techniques for accurate WUS timing and treatment eligibility.

Main Methods:

  • Review of literature on WUS, OSA, and stroke.
  • Discussion of advanced neuroimaging techniques, specifically diffusion-weighted imaging (DWI) and fluid-attenuated inversion recovery (FLAIR) mismatch.
  • Emphasis on diagnostic tools for OSA, including overnight pulse oximetry and home sleep apnea tests.

Main Results:

  • WUS patients are often ineligible for thrombolysis due to unknown stroke onset.
  • The "tissue clock" using DWI/FLAIR mismatch can accurately date WUS within 3-4.5 hours.
  • Moderate to severe OSA is highly prevalent in stroke patients, negatively impacting outcomes.

Conclusions:

  • Accurate WUS timing using advanced imaging enables timely thrombolysis and mechanical thrombectomy.
  • Screening for OSA in stroke patients is crucial for improving outcomes.
  • Effective management of OSA post-stroke is essential but remains challenging, with sleep architecture changes also influencing outcomes.