Reperfusion Injury After Endovascular Stroke Treatment

There is an unmet need to identify risk factors for ICH after MT as it relates to poor prognosis, no proven treatment is available, and it delays/prohibits usage of anticoagulants/-thrombotics necessary for preventing recurrent stroke.

Main objectives:

To explore the range and clinical impact of hemodynamic changes after MT as detected on bedside TCD.

To assess whether patients with increased blood flow velocity in the recanalized middle cerebral artery (MCA) are at a higher risk to develop ICH / vasogenic brain edema (reperfusion injury) after MT.

To investigate if the underlying mechanism is cerebral hyperperfusion (confirmed by perfusion MRI).

To additionally study the role of blood biomarkers of blood-brain-barrier / endothelial dysfunction and neuroaxonal damage on reperfusion injury and short-term prognosis.

Approach / methods:

Prospective, longitudinal Austrian multicentre study conducted at three high-volume stroke centers (Graz, Innsbruck, Salzburg). The investigators will recruit consecutive stroke patients with anterior circulation L VO treated by MT. Immediately after MT, experienced sonographers will perform bedside TCD to determine MCA blood flow status, which will be repeated after 24-48h and on day 7. On day one after MT, brain MRI with perfusion serves to assess infarct size, secondary ICH, (vasogenic) brain edema and perfusion status. MRI will be centrally analyzed in the neuroimaging lab of Graz, blinded to clinical, laboratory and sonographic information. Blood samples for the analysis of biomarkers of endothelial (blood-brain barrier) dysfunction and neuroaxonal damage (neurofilament light) will be taken on day one and at three months post-MT. Neurological outcome will be rated according to the modified Rankin Scale at three months post-stroke.