Vasospasm after thrombectomy may signal microvascular failure needing vasodilatorsNew Perspectives on Managing Blood Flow After Ischemic Stroke

Frontiers in Medicine Published June 16, 2026 DOI ↗ Editorial oversight: Dr. Ji-eun Park, MD · Brain, Mind & Pain

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Key Takeaway

Interpret vasospasm after MT as a potential marker of microvascular failure, not just focal narrowing.

This mini-review proposes that vasospasm after mechanical thrombectomy (MT) for large-vessel occlusion (LVO) ischemic stroke is not merely a focal narrowing but a marker of a complex reperfusion-failure state. The authors synthesize evidence that vasospasm reflects endothelial injury, distal embolization, inflammatory interactions, platelet-rich microthrombi, pericyte-mediated capillary constriction, and microvascular no-reflow. They argue that recanalization alone may fail to ensure microvascular perfusion in these patients, and that vasodilator strategies (e.g., milrinone) should be evaluated using tissue-level endpoints such as tissue perfusion, infarct evolution, and functional outcome. The review is a proposal/perspective rather than a presentation of primary data; no pooled effect sizes, sample sizes, or comparative outcomes are reported. Limitations include the lack of clinical trial data for milrinone or other vasodilators in this setting. The practice relevance is that vasospasm may identify a subgroup where recanalization is insufficient, suggesting a need for adjunctive vasodilator therapy, but this remains hypothesis-generating.

How this fits prior evidence

This mini-review extends prior coverage of milrinone's vasodilator use in CABG by proposing a role in ischemic stroke after thrombectomy. It contrasts with the hypothesis linking levodopa to frailty by focusing on acute reperfusion rather than chronic exposure. The review addresses a gap by linking vasospasm to microvascular failure, but remains a perspective without primary data.

This review looks at how doctors manage blood flow in patients who have suffered a large-vessel occlusion, a serious type of ischemic stroke. Specifically, it examines the role of vasospasm, which occurs when small blood vessels constrict after a major blockage is cleared during mechanical thrombectomy.

The authors suggest that vasospasm may be a sign of complex issues like tissue damage or tiny blockages in smaller vessels. Because these problems can prevent blood from reaching healthy tissue even after the main clot is removed, identifying them early could help doctors choose better treatments. This includes looking at vasodilator strategies to improve microvascular flow.

It is important to note that this paper is a perspective piece rather than a clinical trial. It does not provide new data on specific medications like milrinone or other vasodilators. Instead, it offers a framework for how doctors might use tissue-level markers to decide when extra treatment is needed to improve patient outcomes.

What this means for you:

Vasospasm may help identify patients who need extra support to improve blood flow after a major stroke.

Common questions

What is vasospasm and why does it matter for stroke patients?

Vasospasm is the narrowing of small blood vessels. In patients with a large-vessel occlusion, it may indicate that even after a main clot is removed, smaller vessels are still struggling to deliver blood to the brain. Identifying this can help doctors determine if additional treatments are needed to improve tissue perfusion.

Does this research prove that milrinone works for stroke patients?

No, this study does not provide clinical trial data or proof of effectiveness for milrinone. It is a perspective piece that suggests vasodilator strategies should be evaluated using tissue-level endpoints to help identify patients who are not getting enough blood flow after their procedure.

How does this change current treatment for stroke?

This review is a proposal rather than a new clinical trial. It suggests that identifying vasospasm could help doctors find a specific group of patients whose microvascular perfusion is failing, potentially leading to more targeted treatments for those individuals.

Study Details

Study typeMeta analysis

EvidenceLevel 1

PublishedJun 2026

View Original Abstract ↓

Mechanical thrombectomy (MT) has reshaped the treatment of acute ischemic stroke caused by large-vessel occlusion (LVO), yet successful angiographic reperfusion does not reliably translate into meaningful neurological recovery. Landmark randomized trials and the Highly Effective Reperfusion Evaluated in Multiple Endovascular Stroke Trials (HERMES) patient-level meta-analysis established MT as standard of care, but they also brought into focus the persistent problem of incomplete tissue-level rescue despite technically successful recanalization. Procedure-related vasospasm is usually handled as a transient intraprocedural complication, commonly with intra-arterial calcium-channel blockers, and is rarely considered within the broader biology of reperfusion failure. In this mini-review, we propose that vasospasm during endovascular thrombectomy (EVT) should be reinterpreted as a visible marker of a more complex reperfusion-failure state. This state may encompass endothelial injury, distal embolization, inflammatory leukocyte–endothelial interactions,platelet-rich microthrombi, pericyte-mediated capillary constriction, and microvascular no-reflow. Within this framework, intra-arterial vasodilators warrant renewed attention not only for their ability to restore conduit vessel diameter, but also for their potential to influence the quality of tissue perfusion. This perspective is particularly relevant for phosphodiesterase-3 (PDE3) inhibitors such as milrinone, whose pharmacological profile combines vasodilatory effects with biologically demonstrable modulation of platelet activity. Beyond conduit vessel relaxation, such agents may act at the interface between macrovascular recanalization and microvascular reperfusion. We propose that procedure-related vasospasm may identify a subgroup of patients in whom successful recanalization fails to secure effective microvascular reperfusion, and that future studies should evaluate vasodilator strategies using endpoints that extend beyond angiographic resolution to include tissue perfusion, infarct evolution, and functional outcome.

Vasospasm after thrombectomy may signal microvascular failure needing vasodilatorsNew Perspectives on Managing Blood Flow After Ischemic Stroke

How this fits prior evidence

Common questions

Study Details

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Vasospasm after thrombectomy may signal microvascular failure needing vasodilatorsNew Perspectives on Managing Blood Flow After Ischemic Stroke

How this fits prior evidence

Common questions

More on Stroke

Study Details

Intravenous tenecteplase improves functional outcomes but increases hemorrhage risk in non-large vessel occlusion acute ischemic stroke

Tenecteplase improves stroke recovery but increases bleeding risk in late treatment window

Clinical research that matters. Delivered to your inbox.

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