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Revisiting Incomplete Tissue-Level Reperfusion Following Successful Thrombectomy for Acute Ischemic Stroke.

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Incomplete reperfusion after stroke thrombectomy is a challenge. This review explores its mechanisms, assessment, and therapies for better patient outcomes.

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Area of Science:

  • Neurology
  • Vascular Medicine
  • Interventional Neuroradiology

Background:

  • Successful large vessel recanalization (eTICI ≥2b) in acute ischemic stroke doesn't guarantee complete tissue reperfusion.
  • Persistent hypoperfusion post-thrombectomy presents challenges, with varied reported rates (0-42.5%) due to differing definitions and mechanisms.
  • Mechanisms include territorial hypoperfusion from distal emboli and capillary no-reflow (microvascular failure).

Purpose of the Study:

  • To review the current evidence on mechanisms, assessment, and therapeutic strategies for incomplete tissue-level reperfusion after thrombectomy.
  • To highlight the need for standardized definitions and targeted therapies for territorial hypoperfusion and no-reflow.
  • To discuss the translation of preclinical findings into clinical interventions.

Main Methods:

  • Literature review synthesizing current evidence on incomplete reperfusion post-thrombectomy.
  • Analysis of pathophysiological mechanisms: territorial hypoperfusion and capillary no-reflow.
  • Evaluation of assessment methods and therapeutic strategies, including recent randomized controlled trials.

Main Results:

  • Incomplete reperfusion has complex pathophysiology with distinct mechanisms (distal emboli vs. no-reflow).
  • Territorial hypoperfusion may resolve spontaneously (delayed reperfusion), while no-reflow signifies microvascular dysfunction.
  • Persistent hypoperfusion impacts functional outcomes; the impact of true no-reflow is less clear.

Conclusions:

  • Standardized definitions and targeted therapies are crucial for addressing incomplete reperfusion.
  • Intra-arterial thrombolysis may benefit patients with distal emboli, but microvascular dysfunction requires different strategies.
  • Translating preclinical insights into effective clinical interventions for no-reflow is a key future direction.