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Persistently Elevated Microvascular Resistance Postrecanalization.

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Area of Science:

  • Neuroscience
  • Vascular Biology
  • Medical Imaging

Background:

  • Impaired microvascular reperfusion (no-reflow) after stroke treatment is a clinical challenge.
  • The no-reflow phenomenon is well-documented in animal models but not clinically demonstrated.
  • Identifying clinical biomarkers for no-reflow is crucial for therapeutic development.

Purpose of the Study:

  • To investigate transcranial Doppler (TCD) for detecting acute microvascular changes post-recanalization.
  • To establish TCD-derived pulsatility index (PI) as a clinical biomarker for the no-reflow phenomenon in stroke patients.
  • To correlate microvascular resistance with clinical outcomes after acute ischemic stroke treatment.

Main Methods:

  • Retrospective analysis of patients with successfully recanalized middle cerebral artery occlusion via thrombectomy.
  • Comparison of TCD-derived middle cerebral artery pulsatility index (PI) and resistive index (RI) between patients and controls.
  • Assessment of microvascular resistance on days 1-3 post-procedure and correlation with 90-day functional outcomes.

Main Results:

  • Significantly increased middle cerebral artery PI in the symptomatic hemisphere of patients compared to controls (P=0.007).
  • Elevated PI was observed in 46.7% of patients versus 22.0% of controls (P=0.016).
  • Higher PI was associated with less hemorrhagic infarction (P=0.009) but worse functional outcomes (P=0.035).

Conclusions:

  • Elevated microvascular resistance, measured by PI on TCD, is common after successful stroke recanalization.
  • TCD-derived PI serves as a readily available and clinically relevant biomarker for the no-reflow phenomenon.
  • This finding may guide targeted therapies to improve outcomes in stroke patients with no-reflow.