Endovascular Thrombectomy Techniques for Acute Ischemic Stroke Management

Endovascular thrombectomy has revolutionised the management of acute ischaemic stroke by directly removing occlusive thrombi from cerebral arteries. Techniques have evolved from early mechanical devices to contemporary stent retrievers and direct aspiration systems. Stent retrievers expand within the clot to engage and extract thrombus, often used in combination with balloon-guide catheters to reduce distal embolisation. Aspiration-first approaches, typified by the ADAPT (A Direct Aspiration First Pass Technique) method, employ large-bore catheters to apply suction at the clot face, sometimes supplemented by microcatheters or microwires. Hybrid strategies combine stent retriever deployment with concurrent aspiration for improved first-pass recanalisation. The concept of the first pass effect—the achievement of near-complete reperfusion on a single device pass—has emerged as a key predictor of favourable outcomes. Preprocedural imaging, including CT-angiography and perfusion studies, guides patient selection by identifying salvageable penumbra and assessing collateral circulation. Advances in catheter design, clot-engagement mechanisms and flow-arrest techniques have extended the time window for intervention and improved functional independence rates. Ongoing research focuses on optimisation of device choice according to clot characteristics, minimising manoeuvres to reduce vascular injury, and refining protocols for challenging subsets such as posterior circulation strokes and elderly patients.

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Endovascular Thrombectomy Techniques for Acute Ischemic Stroke Management publication trend

The graph below shows the total number of articles in endovascular thrombectomy techniques for acute ischemic stroke management across all publications each year (not limited to Nature Index journals).

Technical terms

Endovascular thrombectomy: A minimally invasive procedure to remove clot from a cerebral artery via catheter access.

Stent retriever: A self-expanding mesh device that ensnares the thrombus for extraction.

Direct aspiration (ADAPT): A technique using a large-bore catheter to apply suction directly to the clot face for retrieval.

Modified Thrombolysis in Cerebral Infarction (mTICI) scale: A grading system for reperfusion quality, with 2b–3 indicating successful reperfusion.

First pass effect: Achieving near-complete recanalisation with a single device pass.

Large vessel occlusion (LVO): Blockage of a major cerebral artery, typically the internal carotid or proximal middle cerebral artery.

Collateral circulation: Alternative vascular pathways that maintain perfusion distal to an occlusion.

Balloon-guide catheter: A proximal balloon-inflatable catheter used to arrest antegrade flow and reduce embolic risk during thrombectomy.

References

1. Collateral flow and pulsatility during large vessel occlusions: insights from a quantitative in vitro study. Frontiers in Bioengineering and Biotechnology (2024).
2. Safety and outcomes of different endovascular treatment techniques for anterior circulation ischaemic stroke in the elderly: data from the Imperial College Thrombectomy Registry. Journal of Neurology (2023).
3. First Pass Effect in Patients Treated With the Trevo Stent-Retriever: A TRACK Registry Study Analysis. Frontiers in Neurology (2020).