Procedure-related vasospasm and reperfusion vulnerability during mechanical thrombectomy

Area of Science:

• Neurology
• Vascular Biology
• Interventional Cardiology

Background:

• Mechanical thrombectomy (MT) is standard for acute ischemic stroke with large-vessel occlusion (LVO).
• Despite successful MT, neurological recovery is often incomplete due to reperfusion failure.
• Procedure-related vasospasm is typically seen as a complication, not a marker of broader issues.

Purpose of the Study:

• Reinterpret procedure-related vasospasm during endovascular thrombectomy (EVT) as a marker of reperfusion failure.
• Explore the potential of vasodilators, particularly PDE3 inhibitors, to improve microvascular reperfusion.
• Highlight the need for new endpoints beyond angiographic success to assess EVT effectiveness.

Main Methods:

• Review of existing literature on MT, LVO, vasospasm, and reperfusion injury.
• Conceptual framework linking vasospasm to endothelial dysfunction, microemboli, and microvascular no-reflow.
• Pharmacological analysis of vasodilators, focusing on PDE3 inhibitors like milrinone.

Main Results:

• Vasospasm during EVT may indicate a complex state involving endothelial injury, distal embolization, and microvascular dysfunction.
• Vasodilators may improve not only conduit vessel diameter but also tissue perfusion quality.
• PDE3 inhibitors possess properties beneficial for both vasodilation and platelet modulation.

Conclusions:

• Procedure-related vasospasm during EVT warrants re-evaluation as a potential indicator of reperfusion failure.
• Vasodilator strategies, including PDE3 inhibitors, may offer a novel approach to enhance microvascular reperfusion.
• Future research should incorporate tissue perfusion and functional outcomes to better evaluate EVT efficacy.