The evolution of reperfusion therapy in acute myocardial infarction and acute ischaemic stroke has many similarities: thrombolysis is superior to placebo, intra-arterial thrombolysis is not superior to intravenous (i.v.), facilitated intervention is of questionable value, and direct mechanical recanalization without thrombolysis is proven (myocardial infarction) or promising (stroke) to be superior to thrombolysis-but only when started with no or minimal delay. However, there are also substantial differences. Direct catheter-based thrombectomy in acute ischaemic stroke is more difficult than primary angioplasty (in ST-elevation myocardial infarction [STEMI]) in many ways: complex pre-intervention diagnostic workup, shorter time window for clinically effective reperfusion, need for an emergent multidisciplinary approach from the first medical contact, vessel tortuosity, vessel fragility, no evidence available about dosage and combination of peri-procedural antithrombotic drugs, risk of intracranial bleeding, unclear respective roles of thrombolysis and mechanical intervention, lower number of suitable patients, and thus longer learning curves of the staff. Thus, starting acute stroke interventional programme requires a lot of learning, discipline, and humility. Randomized trials comparing different reperfusion strategies provided similar results in acute ischaemic stroke as in STEMI. Thus, it might be expected that also a future randomized trial comparing direct (primary) catheter-based thrombectomy vs. i.v. thrombolysis could show superiority of the mechanical intervention if it would be initiated without delay. Such randomized trial is needed to define the role of mechanical intervention alone in acute stroke treatment.

Cardiocenter 3rd Faculty of Medicine Charles University Prague Ruska 87 100 00 Prague 10 Czech Republic

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Catheter-based interventions for acute ischaemic stroke